- May 2023
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study provides an unprecedented overview of the subcellular organization of proliferative blood stage malaria parasites. The localization of multiple parasite organelles is comprehensively probed using three-dimensional super-resolution microscopy throughout the entire intraerythrocytic development cycle. This work provides a compelling framework to investigate in future more deeply the unconventional cell biology of malaria-causing parasites.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable paper reports the development of SCA-seq, a nanopore-based multiOME mapping method for simultaneously measuring chromatin accessibility, genome 3D and CpG DNA methylation. The methods, data and analyses are solid and largely support the claims. This new tool to interrogate genome structure-function relationships will be of broad interest to geneticists and many others.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Tilk and colleagues present a valuable computational analysis of tumor transcriptomes to investigate the hypothesis that the large number of somatic mutations in some tumors is detrimental such that these detrimental effects are mitigated by an up-regulation by pathways and mechanisms that prevent protein misfolding. The authors address this question by fitting a model that explains the log expression of a gene as a linear function of the log number of mutations in the tumor and show that specific categories of genes (proteasome, chaperones, ...) tend to be upregulated in tumors with a large number of somatic mutations. Some of the associations presented could arise through confounding, but overall the authors present solid evidence that mutational load is associated with higher expression of genes involved in mitigation of protein misfolding - an important finding with general implications for our understanding of cancer evolution.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors set out to study the development of high altitude polycythemia, which affects mice in a hypoxia chamber and humans staying at a hypoxic atmosphere at high altitude. The findings are useful both for initiating the discussion of the hypothesis that splenic red pulp macrophages, central to red cell survival, are impacted by hypoxia, and for providing some data that partially supports this hypothesis. However, the current data are inadequate to fully support the authors' conclusions.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important paper reports data on the cellular response to a single site-specific replication fork block in human MCF7 cells. Compelling evidence shows the efficacy of the bacterial Tus-Ter system to stall replication forks in human cells, with fork stalling leading to lasting ATR-dependent phosphorylation of histone H2AX but not of ATR itself and its downstream targets RPA and CHK1. The work will be of broad interest to students of DNA replication.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable study uses multiple large neuroimaging data sets acquired at different points through the lifespan to provide solid evidence that birthweight (BW) is associated with robust and persistent variations in cortical anatomy, but less-substantial influences on cortical change over time. These findings, supported by robust statistical methods, illustrate the long temporal reach of early developmental influences and carry relevance for how we conceptualize, study, and potentially modify such influences more generally. The paper will be of interest to people interested in brain development and aging.
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www.researchsquare.com www.researchsquare.com
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eLife assessment
This valuable study revisits the effects of substitution model selection on phylogenetics by comparing reversible and non-reversible DNA substitution models. The authors provide evidence that 1) non time-reversible models sometimes perform better than general time-reversible models when inferring phylogenetic trees out of simulated viral genome sequence data sets, and that 2) non time-reversible models can fit the real data better than the reversible substitution models commonly used in phylogenetics, a finding consistent with previous work. However, the methods are incomplete in supporting the main conclusion of the manuscript, that is that non time-reversible models should be incorporated in the model selection process for these data sets.
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eLife assessment
This important manuscript combines cryo-EM and a suite of compelling whole cell and proteoliposome transport assays to establish the mechanism and structure of the full-length human SLC26A6 chloride/bicarbonate exchangers, including the first partial view of the previously unresolved IVS region of an SLC26 STAS domain. In combination with prior studies on additional SLC26 paralogs, including the SLC26A9 paralog initially reported by the same group, the study provides broadly relevant insights into the mechanistic diversity of the SLC26 transporters. This study is of interest to the biophysics community and the field of membrane transport.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study provides novel strategies to overcome certain limitations when investigating the metabolism of hematopoietic stem cells, mainly due to their low abundance. The study provides some solid evidence suggesting that hematopoietic stem cells mainly use glycolysis (rather than mitochondrial OXPHOS or TCA cycle) as their primary energy source, when proliferating in response to hematopoietic stress, as opposed to homeostasis. With the evidence further strengthened by more direct links between metabolic features and cell proliferation, and after consideration of alternative energy sources, this study would be of great interest to stem cell biologists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study uses CRISPRi to silence multiple effectors in the pathogen Legionella pneumophila. The paper provides a technique that will allow researchers to address functional redundancy amongst effectors, a problem that has persisted even after decades of study. The methodology used is convincing, and further improvement can lead to the identification of novel virulence factors.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study unifies our current understanding of phosphate homeostasis and starvation responses in different eukaryotes, in which the nutrient messenger 1,5-InsP8 binds to one or several cellular SPX receptors, which in turn regulate very different, species-specific PHO pathway components. The evidence is compelling and supported by biochemical analyses, protein localization by fluorescence, and genetic approaches, but could still be strengthened by additional experiments. The work will be of interest to a broad community working on nutrient signalling in eukaryotes.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study addresses both the native role of the Plasmodium falciparum protein PfFKBP35 and whether this protein is the target of FK506, an immunosuppressant with antiplasmodial activity. The genetic evidence for the essentiality of FKBP35 in parasite growth is compelling. However, the conclusion that the role of FKBP35 is to secure ribosome homeostasis and the claim that FK506 exerts its antimalarial activity independently of FKBP35 rely on incomplete evidence.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The current manuscript investigates the energy landscape of the mammalian sugar porter GLUT5 using enhanced molecular dynamics simulations and biochemical assays. The approach generates important insights into the mechanism of GLUT5 conformational change, and into mechanistic diversity among the GLUT sugar porters more generally. The overall strategy is solid, but without an additional error analysis, the computational components remain incomplete. These findings will be of interest to the transporter and membrane biology communities.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This useful study adapts methods from causal inference to develop analytical tools for determining the causal influence of single cells on downstream neurons. The simulation evidence is solid, suggesting that these causal methods produce better estimates under biologically-relevant confounds given enough data, although the practical application of the method and the biophysics it relies on is unclear. Nonetheless, this application of causal methods developed in econometrics and other fields could suggest new ways to think about largely observational datasets in neuroscience.
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eLife assessment
Hyperpolarised-activated and Cyclic Nucleotide-gated (HCN) channels are the only mammalian channels to open under hyperpolarisation, being important for their roles in cardiac and neuronal cells. The authors of this study use atomistic simulations to enforce changing interaction distances that have been identified from a cryoEM structure and a homology model based on the hERG channel. The simulations suggest state-dependent interactions involving pore and voltage sensor helices, as well as with lipids, leading the authors to propose a domino-like mechanism of activation. These findings will be of considerable interest to the ion channel community.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is a comprehensive approach to understanding the genetic requirements of the VEGF family in the generation of brain capillary structure in zebrafish. The manuscript combines vascular brain/meningeal anatomy revealed with a variety of reporter lines, with mutants for Wnt/β-catenin signaling and angiogenic cues. In particular revealing genetic redundancy in VEGF receptor family in an essential function in vasculature development.
This paper is significant because it provides compelling evidence that features methods, data, and analyses more rigorous than the current state-of-the-art in analysis of brain vasculature development. The data derived from the reporter lines are convincing, and the germline mutations allow for solid visualization and quantification of results.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study provides continuous maps of human brain gene expression and explores their relationship with a large variety of microscopic and macroscopic aspects of brain organisation. The authors provide convincing evidence for a relationship between gene expression maps with various aspects of the anatomy of adult brains, during development, and in the case of mental disorders. The data and methods introduced can be an important tool for neuroimaging research.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
These valuable findings will be of interest for the study of dystroglycanopathies and in the general area of axon migration and synapse formation. This work provides solid conclusions about how a range of dystroglycan mutations alter CCK interneuron axonal targeting and synaptic connectivity in the forebrain, and seizure susceptibility.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This work represents an important contribution to our understanding of how phenomena associated with the theta rhythm in the hippocampus could be generated even in the absence of theta. This convincing computational work provides a parsimonious continuous attractor network model of how hippocampal place cell networks can briefly sweep forward to represent future locations and then sweep back, even in animal species in which theta oscillations are only weakly (or not at all) present.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The study expands our understanding of the neural circuitry downstream of the cerebellum by describing pathways between the deep cerebellar nuclei and the nucleus accumbens. The authors use a combination of in vivo electrophysiology, electrical and optogenetic stimulation, and both anterograde and retrograde tracing to demonstrate two functional neural pathways. The experiments convincingly support the claims. The finding extends previous investigations about the connections between these two brain areas, and are important for elucidating the role of the cerebellum in influencing functions supported by the nucleus accumbens, such as motivation and reward.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important work presents an interesting perspective for the generation and interpretation of phase precession in the hippocampal formation. Through numerical simulations and comparison to experiments, the study provides solid evidence for the role of the DG-CA3 loop in generating theta-time scale correlations and sequences, which would be reinforced through the clarification of the concepts introduced in the study, in particular the notion of intrinsic and extrinsic sequences. This study will be of interest for the hippocampus and neural coding fields.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important paper reveals how cells in adjacent tissues use the extracellular matrix to establish mechanical connections. Through a series of crisp genetic manipulations and quantitative image analyses, the authors provide compelling evidence to show how an essential adhesion between the uterus and the seam cells in the nematode C. elegans is formed. The assembly of type IV collagen triggers internalization of a cell surface receptor, which then signals from endocytic vesicles to strengthen the connection.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study shows that lipid degradation is critical for spermatogenesis, with data supporting relevance of this finding across phyla. The authors contribute to a growing realization that lipid droplets have critical roles during differentiation and can influence cell fate, and use convincing methods to analyze the effects of loss of the lipase Brummer on germ line differentiation. This paper will be of interest to developmental and cell biologists working on gametogenesis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The important paper describes the structure of a single alpha helix in the large subunit of the Chromatin Assembly Factor 1 (CAF-1) that binds DNA. The single alpha-helix DNA interaction is novel and, combined with the CAF-1 Winged Helix Domain, is required for CAF-1 function in vivo for gene silencing and DNA damage response. The data are convincing, but there are additional analyses that may be considered.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study reports of a new signaling pathway in hippocampal neurons by which alpha-1 receptors for norepinephrine regulates Cav1.2 calcium channels; activation of alpha-1 receptors enhances a form of long-lasting synaptic plasticity that is dependent on L-type calcium channels. The experiments are comprehensive and well executed although additional data are warranted to compellingly support the main conclusions. The work has significance for the field of neuroscience in general and for cellular mechanisms of neuroregulation in particular.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Modi et al. investigate the question of how learned information guides behavior. They combine optogenetic conditioning in Drosophila to spatially restrict the formation of olfactory memory traces in mushroom bodies (MBs), where olfactory memory traces are formed during pavlovian olfactory conditioning and follow up with behavioral studies and physiological analysis to examine how flies use these 'minimal memories' during learned olfactory discrimination. They discover that MBONs' responses predict behavioral outcomes, with odor responses showing physiological differences under conditions where broadly similar odorants must be discriminated. Thus, flies use olfactory memory templates flexibly to suit their behavioral needs. Modi et al. conclude that a hitherto unknown mechanism downstream of mushroom body output neurons creates these context-specific responses at the MBONs. Overall, the experiments provide convincing physiological evidence for a neural mechanism that underlies a contextual basis for the precision of memory recall, which constitutes a fundamentally important advance in our understanding of the neurobiology of memory retrieval, however, the authors need to more deeply consider caveats to their arguments, more deeply discuss differences and similarities with prior publications and bolster their data by including a few controls that are currently missing.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors set out to characterize a function of Drosophila glia that form an expansion of myelin-like membranes that might facilitate rapid nerve conduction. A combination of Drosophila genetics, antibody staining, and electron microscopy is used to characterize this "myelin" and the role of glial wrapping in clustering of sodium/potassium channels at motor exit points. The results are valuable, as they would point to Drosophila as a new, genetically accessible model organism to study myelin evolution. While the results are interesting, the strength of the evidence provided is incomplete due to inadequate quantification of the data provided.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript is of interest for the fields of ageing, mRNA translation and C. elegans biology, as it provides new insights into the regulation of lifespan by alternate mechanisms that modulate mRNA translation in selected environmental contexts. While overall the main conclusions are supported by the data and of interest, the work would be stronger with control experiments that more fully and more consistently support all the conclusions. Furthermore, data presentation and interpretation need some attention.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The important work presented here provides findings that substantially advance our understanding of a major research question into how bicarbonate/CO2 signaling regulates cardiac mitochondrial energy supply. The methods, data, and analyses broadly support the claims with only minor weaknesses concerning the exact spatial location of the enzymes involved. The work will be of broad interest to cell biologists and biochemists interested in metabolic control.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents an important description on the dynamics of histone variant exchange controlling the organization of the chromatin state of the Arabidopsis genome, combining the analysis of histone variants, histone modification, and chromatin states. The evidence supporting the claims of the authors is compelling, but some of the main claims are only partially supported experimentally. This work will be of great interest to those in the field of epigenetics and chromatin biology.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable study investigates the environmental drivers behind termite construction, focusing, in particular, on pellet deposition behavior, with the conclusion that termites likely sense curvature indirectly through substrate evaporation. The findings reconcile discrepancies between previous studies through experimental and computational approaches. The strength of the evidence supporting the claims is solid, although many computational details are still missing, and the are concerns about the repeatability of the results across replicates, the dynamics of evaporation in their experiment, and the termites' ability to sense humidity.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper describes a useful analysis tool for quantitative assessment of sarcomere structures in healthy and perturbed cardiomyocytes. The work is solid, and the methods, data and analyses broadly support the claims with only minor weaknesses. The tool will be of interest to biologists working on sarcomere structure, function and development.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This useful manuscript challenges the utility of current paradigms for estimating brain-age with magnetic resonance imaging measures, but presents inadequate evidence to support the suggestion that an alternative approach focused on predicting cognition is more useful. The paper would benefit from a clearer explication of the methods and a more critical evaluation of the conceptual basis of the different models. This work will be of interest to researchers working on brain-age and related models.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents important findings that set a new standard for generating and maintaining monosomic yeast lines, and is the first, to our knowledge, to assess gene expression in yeast monosomies. The research offers an innovative approach to evaluate epistasis between genes on the same chromosome; however, the strength of evidence supporting the conclusions on positive epistasis for fitness is still incomplete due to the need for clarification for the exact calculation method of expected fitness without epistasis, as well as due to a lack of molecular mechanisms. Additionally, the interpretation of transcriptome results would benefit from a more comprehensive consideration of previous studies on genomic balance and the inclusion of further analyses and experiments.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable manuscript provides a single-cell RNA sequencing analysis of adult pig skin from different species and anatomical regions. The evidence supporting the conclusions is compelling, with identification molecular and cellular differences in pig skin, yet the analyses are incomplete in the analysis of regional- or species-based differences.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is an important study that defines cell type changes upon the expression of a mutant tau protein and put it into context of human postmortem tissue. Technically, the single cell mRNA sequencing data are convincing but the loss of neurons already at the earliest stages assessed in this model may rather suggest there are also elements of developmental toxicity.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This fundamental study substantially advances our understanding of how aging and stress resilience across an organism is determined by identifying a new player in this process and uncovering its mode of action. The evidence is solid as the methods, data and analyses broadly support the claims with only minor weaknesses. The work will be of broad interest to the field of aging and protein homeostasis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Studies of prey behavior have the potential to provide insight into the chemical encoding of stress in the brain and the mechanisms by which this generates behavioral plasticity. In this important work, the authors identify a novel predation-evoked behavior in the nematode C. elegans and implicate dopamine in its implementation. While the support for some claims in the current paper is incomplete, this work provides an exciting foundation for future studies of behavioral plasticity in this powerful system.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The toxin mycolactone is produced by mycobacterium ulcerans which is responsible for the Buruli ulcer. The authors performed a valuable study showing the effects of mycolactone on blood vessels integrity. This convincing data provide new therapeutic targets to accelerate healing of Buruli ulcers.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper is of interest to neuroscientists studying the effects of sex hormones on neural and behavioral plasticity, and more specifically to researchers studying the neural mechanisms underlying birdsong plasticity. The experimental design is excellent, and the work provides a comprehensive resource for understanding the intersection between testosterone's influence on gene expression and behavior. However, the work also makes claims concerning cellular effects and gene regulatory mechanisms that extend beyond the data and under the current analyses are not rigorously supported.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study is an excellent example of how one can use high-throughput technologies to address animal evolution from a cell-type perspective. The authors present a beautiful analysis of single-nucleus RNA-seq data from three embryonic stages in a sea star; this is the first single-cell data from this large group of echinoderms and the first single-nucleus transcriptomic study in any echinoderm. The authors demonstrate the presence of unique as well as previously unnoticed homologous cell types between a sea star and a sea urchin, discovery very intriguing to echinoderm developmental biologists, which will also be of great interest to scientists in the broad fields of evolution and development.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
The findings of this study yield important new insights into the relationship between the number of close friends and mental health, cognition, and brain structure. Due to the large sample sizes, the evidence is solid but would have been improved if both of the analyzed datasets contained more closely matched measures. This work advances our understanding of how the friendship network relates to young adolescents' mental well-being and cognitive functioning and their underlying neural mechanisms.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This potentially important work proposes a novel approach, based on co-evolution analysis, machine-learning protocols and molecular dynamics simulations, to predict structures and energetics of the main states of the alternating access cycle of a family of membrane transporters, the sugar porters. The approach is compelling, especially the application of co-evolution and Alphafold to generate highly accurate models in different conformational states of a given protein, but the work is currently incomplete due to shortcomings in the calculation of the energy landscape. With this aspect strengthened, the manuscript will be of interest to the transporter and computational modeling communities.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
This study presents useful structural and functional connectivity profiles of patients receiving deep brain stimulation in the posterior hypothalamus for severe and refractory aggressive behavior. The inclusion of data from multiple centers is compelling. However, the imaging analysis is incomplete and the interpretation of the findings is not solid.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study reports a joint experimental and computational investigation of the structural features of biomolecular condensates formed by a specific intrinsically disordered protein. The authors also adapt emerging rules to discuss and physico-chemical determinants of these structures of condensates. Specifically, the authors adapt the analysis of fractal structures, co-opted from the field of colloidal chemistry / physics, and generate important insights regarding the network-like organization of disordered proteins within in silico facsimiles of condensates. The usage of these analyses in the context of studying all atom models for multi-chain assemblies intended to mimic the internal organization of condensates is very interesting. The work is of relevance to cell biology and structural biology.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The study of Thiery et al. details the heterogeneous expression of a very large number of genes presumably associated with cell fate decisions in the ectoderm at the neural plate border in early avian embryos. The authors mostly succeed in presenting their very complex strategy of data analysis in a clear way but the work is incomplete with some conceptual weaknesses in how the authors describe and interpret their results. By focusing on one of the earliest cell fate decisions in the ectoderm of a vertebrate embryo, this study will be valuable to a broad range of developmental biologists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents a useful application of a prior model published by the authors to a new dataset. The results from this approach were interesting and solid but the conclusions that one can make from the application of the model to only one paper are limited in scope and would depend on further probing to know if the model itself has face validity as a model of ventral visual stream function.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Protein and lipid homeostasis are important for maintaining cellular functions but their crosstalk remains largely unknown. This important manuscript deals with this interesting topic and applies the powerful unbiased tools of somatic cell genetics to discover evidence suggesting a link between sphingolipids/cholesterol ester metabolism and lysosomal protein aggregation. However, in our view the experimental evidence in support of the paper's stated conclusions remains incomplete and measures that (i) go beyond reliance on the ProteoStat stain as the sole metric for aggregation and proteostatic challenge, (ii) biochemically back up the results and provide plausible mechanistic insights into the connection of lysosomal lipid handling and protein aggregation are needed.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper introduces the python software package Pynapple and a separate package of more advanced routines (Pynacollada) to the Neuroscience/Neural Engineering community. Pynapple provides a set of data objects and methods that have the potential to simplify data analysis for neural and behavioral data types. This represents a valuable contribution to the field. The evidence was judged to be incomplete due to the fact that key details were missing.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is an important paper that revises the canonical model of how olfactory sensory neurons choose which odor receptor to express. The data presented in the paper are convincing and the model proposed is provocative and likely to enable important future work.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study combines state-of-the art proteomics and genetic manipulation of Chlamydia trachomatis to study the function of a chlamydial effector, Cdu1, with deubiquitination and acetylation activities. Solid evidence is provided to show that Cdu1 is able to protect itself and three other chlamydial effectors, which are involved in the control of chlamydial egress from host cells, from ubiquitin-mediated degradation, and that this depends on the acetylation activity of Cdu1, but not on its deubiquitination activity. This work should be of interest to microbiologists and cell biologists studying host cell-pathogen interactions.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable work describes a novel role of Vangl2, a core planar cell polarity protein, in mechanistically linking the inflammatory NF-kB pathway to selective autophagic protein degradation. Using solid methods, the authors also establish the functional significance of the proposed mechanism in sepsis, a biomedically important human ailment. The work may advance our understanding of NF-kB control, particularly in the context of aberrant inflammation. However, some gaps remain, and additional studies are needed to unequivocally establish the role of Vangl2 in regulating NF-kB signaling.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This work presents an important methodological advance for single-molecule force spectroscopy of membrane proteins providing a new robust design of the linkage between a target single molecule and solid support. The data provide compelling evidence of the improved mechanical stability of the pulling system. Allowing more statistically reliable force measurements of biomolecules, this method may be broadly applicable in the field of single-molecule biophysics.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors present an exciting idea about how to integrate morphogens into a gene regulatory network with the dynamics of morphogenesis and cell movement. It represents a novel methodology, but in its current form the hypotheses, data and relationships described do not provide a sufficiently compelling model to disentangle cause and effect or elucidate the impact of cell movements on differentiation dynamics the zebrafish mesoderm.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important work investigates how two distinct processes, morphological changes and synaptic plasticity, contribute to the final shape of neuronal dendrites and the spatial structure of their synaptic inputs. The modelling is solid and could be broadly applied to other similar questions. Some of the findings are a direct result of how the model is constructed, which limits the impact. The work will be of interest to neuroscientists studying dendritic development and connectivity at a single-cell level.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper presents important findings on the hexametric structure of MCM8/9, which potentially explain its role as a DNA helicase in homologous recombination. Due to the lack of DNA in the complex and the invisibility of HROB the current data only provide an incomplete model of the function of the MCM8/9 complex. This work will be of interest to biologists studying DNA transactions.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors present a useful analysis of different factors that are required for release of the lipid-linked morphogen Shh from cellular membranes. The evidence is currently still incomplete as experiments rely on over-expression of Shh in a single cell line and are sometimes of a correlative nature. The study confirms and extends previous findings and will be of interest to developmental biologists who work on Hedgehog signaling.
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www.biorxiv.org www.biorxiv.org
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eLife assessment:
This study introduces a valuable paradigm in the filed of adipose biology field: blocking triglyceride storage in adipose tissue does not lead to lipodystrophy and impaired glucose homeostasis but instead improves metabolic health. The evidence supporting these claims are convincing, with the authors providing a comprehensive metabolic analysis. However, mechanistic studies, which are currently incomplete, would strengthen the study and its impact. Regardless, this study will be of high interest to those in the adipose tissue biology and metabolism fields.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents an important open-source resource for high-throughput behavioral screening. The protocols employ inexpensive, off the shelf hardware, and carry out real-time analysis of hundreds of behaving flies. Although these protocols were developed using Drosophila melanogaster, they could easily be applied to other model systems. The evidence in support of the conclusions is solid although more details on the algorithms used for phenotyping would be helpful in order to better assessing the overall robustness of the platform.
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www.youtube.com www.youtube.com
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Within the pantheon of types of notes there are: - paraphrasing notes, which one can use to summarize ideas for later recall and review as well as to check one's own knowledge and understanding of what an author has said. - commentary notes, which take the text and create a commentary on them, often as part of having a conversation with the text. These can be seen historically in the Midrashim tradition of commenting on Torah.
separately also: - productivity notes - to do lists, reminders of work to be done, often within or as part of a larger complex project
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable work provides new insights into history-dependent biases in human perceptual decision-making. It provides compelling behavioral and MEG evidence that humans adapt their history-dependent to the correlation structure of uncertain sensory environments. Further neural data analyses would strengthen some of the findings, and the studied bias would be more accurately framed as a stimulus- or outcome-history bias than a choice-history bias because tested subjects are biased not by their previous choice, but by the previous feedback (indicating the category of the previous stimulus).
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents valuable findings on a cleaved form of METTL3 that may play an essential role in regulating the assembly of the METTL3-METTL14-WTAP complex. The evidence supporting the claims of the authors is solid, but the model and assays can be improved. The work will be of interest to biologists working on RNA epigenetics and cancer biology.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study provides potentially important, new information about the combination of information from the two eyes in humans. The data included frequency tagging of each eye's inputs and measures reflecting both cortical (EEG) and sub-cortical processes (pupillometry). Binocular combination is of potentially general interest because it provides -in essence- a case study of how the brain combines information from different sources and through different circuits. The strength of supporting evidence appears to be solid, showing that temporal modulations are combined differently than spatial modulations, with additional differences between subcortical and cortical pathways. However, the manuscript's clarity could be improved, including by adding more convincing motivations for the approaches used.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study offers new fundamental information on a role for the sodium/potassium pump in sleep regulation. Elegant methods were used to provide compelling evidence supporting the claim. The work will be of interest to sleep researchers in zebrafish as well as in other species.
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eLife assessment
Yang et al. investigate whether distinct sources of conflict are represented in a common cognitive space. The study uses an interesting task that mixes two different sources of difficulty and reports that the brain appears to represent these sources as a mixture on a continuum, in the prefrontal areas involved in resolving task difficulty. While these results are useful, they overlap with previous findings, leave open several design and logical concerns, and rely on novel statistical analyses that may require further validation, so they are currently incomplete.
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eLife assessment
This is an important study demonstrating that vitamin D-bound VDR both increases SIRT1 expression and directly interacts with SIRT1 to cause auto-deacetylation on Lys610, thereby regulating activation of SIRT1 catalytic activity. The data presented to support the presented conclusions are convincing, and the findings are particularly relevant to the actions of VDR on colorectal cancer.
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eLife assessment
This study presents valuable findings on a potential positive feedback loop between ZEB2 and ACSL4 that regulates lipid metabolism and breast cancer metastasis. The evidence supporting the claims of the authors is solid, but more appropriate validation for ACSL4 interacting with ZEB2 would have strengthened the study. The work will be of particular interest to colleagues working on breast cancer.
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eLife assessment
This important study uses calcium imaging in mice to advance our understanding of the effect of antipsychotic drugs on neural functioning. The evidence supporting the conclusions is solid, although the statistical testing of the data may be improved. This work will be of interest to neuroscientists working on visual processing and psychosis researchers.
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eLife assessment
This study will be of interest and valuable to scientists of many different subareas in the study of eukaryotic extracellular vesicles. The authors' efforts to improve the way we analyze EVs are highly appreciated and their results are convincing: they not only used appropriate and validated methodologies in line with current state-of-the-art but also presented alternatives to improve these approaches.
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eLife assessment
This valuable study reports a complete in vitro system where different steps and direct interactions between different components of MHCI maturation can be monitored, hence leading to a better mechanistic understanding of MHC I maturation. The evidence supporting the findings is currently incomplete and would benefit from clarification of some key issues. This work will be of interest to immunologists and biochemists.
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GLOBIN
Globin Gene Switching is a process of sequential activation and inactivation of globin genes during development. Here's how it works:
- Transcription factors along with epigenetic elements such as DNA methyltransferases and demethylases interact with enhancers "upstream" of the β-globin gene cluster that contact globin gene promoters.
- This process silences the embryonic and fetal genes.
- Activation of fetal globin gene repressors during development allows expression of the adult genes.
- Developmental factors such as RNA-binding factors and microRNAs also impact hemoglobin switching.
β-Globin Gene Switching:
- An upstream super-enhancer called the β-globin locus control region (LCR) binds erythroid-specific and ubiquitous transcription factors.
- The LCR interacts directly with globin gene promoters.
- Transcription factors that silence and activate genes also interact with elements of the globin genes.
- Competition among the β-like genes for the LCR and autonomous silencing of the embryonic and fetal globin genes depends on transcription factors.
- Silencing, first of HBE and then of HBG2 and HBG1, favors the interaction of the LCR with HBB.
- When HBG2 or HBG1 is upregulated by rare point mutations in their promoters, expression of the linked HBB is downregulated.
- Deletions of the HBB promoter remove competition for the LCR, increasing the expression of HBG2, HBG1, and HBD.
- The transcription factors BCL11A and ZBTB7A silence the HbF genes.
- BCL11A binds to the HbF gene promoters, repressing them and silencing transcription; ZBTB7A binds upstream of BCL11A with similar repressive effects.
- Mutations in these binding sites abolish the normal silencing of the HbF genes, leading to hereditary persistence of fetal hemoglobin (HPFH).
- Disruption of the BCL11A regulatory elements or the binding sites for BCL11A by gene editing is a prime therapeutic target for HbF induction.
α-Globin Gene Switching:
- A less complex switch takes place in the α-globin gene cluster.
- A regulatory locus of four elements termed R1-R4 is present within introns of the gene NPRL3 that is upstream of HBA2.
- A developmental switch from embryonic ζ- to adult α-globin gene expression occurs at about 6 weeks’ gestation.
Modulation of HbF Level:
- Variations in three quantitative trait loci (QTL), BCL11A, MYB, and a locus linked to the HBB cluster, account for a major portion of HbF variation among normal individuals and patients with sickle cell anemia and β thalassemia.
- BCL11A, a zinc finger protein that represses HbF genes, binds TGACCA motifs, the most important at position –115 in the promoter of each γ-globin gene.
- ZBTB7A binds 85 nucleotides upstream of these BCL11A binding sites; its binding also represses γ-globin gene transcription.
- When binding of either BCL11A or ZBTB7A is disrupted, silencing of HBG2 and HBG1 is abrogated.
- The MYB gene is essential for hematopoiesis and erythroid differentiation.
- MYB inhibits HbF expression directly by activation of KLF1 and other repressors and indirectly through alteration
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GLOBIN
Here are the major points summarizing the text on globin gene clusters and hemoglobin:
Globin Gene Clusters:
- Globin is encoded in two nonallelic gene clusters: β-globin gene cluster on chromosome 11 and α-globin gene cluster on chromosome 16.
- The β-globin gene cluster contains an embryonic ε-globin gene, two fetal γ-globin genes, a major adult β-globin gene, and a minor adult δ-globin gene.
- The α-globin gene cluster contains an embryonic ζ-globin gene and duplicated α-globin genes with identical proteins.
- Hemoglobin production begins with embryonic hemoglobins: Gower I, Gower II, Portland I, and Portland II.
- Fetal hemoglobin (HbF) production starts at 6-8 weeks of gestation, peaks during mid-gestation, and falls to <1% of total hemoglobin during the first 6 months of extrauterine life.
- Adult hemoglobin A (HbA) production follows a pattern reciprocal to that of HbF.
- Hemoglobin composition of normal adults is >95% HbA, ~1% HbF, and 2-3% HbA2.
- Hemoglobin is subject to posttranslational modifications, the most important being the nonenzymatic glycosylation of HbA forming the adduct HbA1c.
Hemoglobin Structure:
- All globin polypeptides have similar but not identical primary structures. α-Globins contain 141 amino acids, and β-like globins have 146 amino acids.
- The primary structure dictates the secondary structure of globin into α-helical sections joined by small nonhelical stretches.
- Each globin chain folds into a tertiary conformation known as the globin fold, where charged amino acid residues face the exterior of the molecules and uncharged residues face the hydrophobic interior.
- The iron-containing tetrapyrrole heme moiety is protected from oxidation and located between two of the helical segments; O2 loading and unloading occur when heme iron is in its reduced ferrous form.
- Globin gene mutations affecting critical heme-binding amino acid residues allow iron to be oxidized, forming methemoglobin, which has high O2 affinity and does not release O2 in tissues.
- Dimers of α- and non-α-globin chains reversibly assemble into tetramers, forming a quaternary structure.
Hemoglobin Function:
- Hemoglobin transports O2 from lungs to tissues and carbon dioxide (CO2) from tissues to lungs.
- Hemoglobin is a nitrate reductase that releases nitric oxide (NO) from nitrite to promote vasodilation.
- Oxygen binding is defined by the sigmoidal shape of the hemoglobin-O2 dissociation curve.
- The P50 is a point on this curve that indicates the partial pressure of O2 where hemoglobin is half saturated.
- The P50 is influenced by the binding of 2,3-bisphosphoglycerate, pH, and temperature.
- The conformation of hemoglobin fully saturated with O2 is known as the R or relaxed state; desaturated hemoglobin is in the T or tense state.
- Hemoglobin variants that decrease P50 are characterized by isolated erythrocytosis as compensation for hypoxia.
- Variants with increased P50 sometimes are accompanied by cyanosis and anemia as hemoglobin becomes unsaturated and O2 delivery is enhanced.
- Mutations of residues critical for heme binding, R-T transitions, or tetramer stability cause hemoglobinopathies characterized by hemolytic anemia
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eLife assessment
This work aims to discover the mechanisms governing the switch between conventional DNA replication and telomeric end-replication that requires a specialized mechanism. Genetic and biochemical assays for protein modifications and interactions suggest an interplay between sumoylated PCNA and chromosome terminal capping proteins. The results address an important question that would have implications for several fields interested in genome stability questions. However, several claims, even some that form the basis of the proposed molecular models, are incompletely supported by the data.
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eLife assessment
This study presents convincing evidence of the correlation between social tolerance and communicative complexity in a comparison of three macaque species. Notably, the authors use an innovative, detailed methodology for quantifying facial expressions during social interactions that provides a valuable framework for future comparative research in animal communication. These findings would be further strengthened with some conceptual clarity regarding the basis of the hypotheses being tested and the addition of an interobserver reliability test.
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eLife assessment
This study provides valuable information on the biogenesis of eccDNAs during spermatogenesis, i.e., eccDNAs in spermatogenic cells are not derived from miotic recombination hotspots but represent oligonucleosomal DNA fragments from apoptotic male germ cells, whose ends are ligated through microhomology-mediated end-joining. The study is currently incomplete because the method of bioinformatics needs more details and data interpretation should take the amplification bias into consideration.
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Secretory
Sure, here's a summary of the causes of secretory diarrhea presented in the text:
Causes of secretory diarrhea:
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Medications: Regular ingestion of drugs and toxins, including prescription and over-the-counter medications, may produce diarrhea. Stimulant laxatives and chronic ethanol consumption may also cause secretory-type diarrhea.
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Bowel resection, mucosal disease, or enterocolic fistula: These conditions may result in secretory-type diarrhea because of inadequate surface for reabsorption of secreted fluids and electrolytes.
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Partial bowel obstruction, ostomy stricture, or fecal impaction: These may paradoxically lead to increased fecal output due to fluid hypersecretion.
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Hormones: Secretory diarrhea may be caused by hormones, including those released by metastatic gastrointestinal carcinoid tumors, gastrinomas, VIPomas, medullary carcinoma of the thyroid, and systemic mastocytosis.
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Bacterial infections: Certain bacterial infections may occasionally persist and be associated with a secretory-type diarrhea.
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Environmental toxins: Inadvertent ingestion of certain environmental toxins (e.g., arsenic) may lead to chronic rather than acute forms of diarrhea.
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Idiopathic bile acid malabsorption (BAM): Reduced negative feedback regulation of bile acid synthesis in hepatocytes by fibroblast growth factor 19 (FGF-19) produced by ileal enterocytes results in a degree of bile-acid synthesis that exceeds the normal capacity for ileal reabsorption, producing BAD. An alternative cause of BAD is a genetic variation in the receptor proteins (β-klotho and fibroblast growth factor 4) on the hepatocyte that normally mediate the effect of FGF-19.
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Colonic transit: Genetic variation in the bile acid receptor (TGR5) in the colon may result in accelerated colonic transit.
It's worth noting that some of these causes may overlap or occur in conjunction with each other.
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The
Points:
The cornerstone of diagnosis in those suspected of severe acute infectious diarrhea is microbiologic analysis of the stool.
Workup includes cultures for bacterial and viral pathogens; direct inspection for ova and parasites; and immunoassays for certain bacterial toxins (C. difficile), viral antigens (rotavirus), and protozoal antigens (Giardia, E. histolytica).
Clinical and epidemiologic associations may assist in focusing the evaluation.
If a particular pathogen or set of possible pathogens is implicated, either the whole panel of routine studies may not be necessary or, in some instances, special cultures may be appropriate.
Molecular diagnosis of pathogens in stool can be made by identification of unique DNA sequences, and evolving microarray technologies have led to more rapid, sensitive, specific, and cost-effective diagnosis.
Persistent diarrhea is commonly due to Giardia, but additional causative organisms that should be considered include C. difficile, E. histolytica, Cryptosporidium, Campylobacter, and others.
Flexible sigmoidoscopy with biopsies and upper endoscopy with duodenal aspirates and biopsies may be indicated if stool studies are unrevealing.
Structural examination by sigmoidoscopy, colonoscopy, or abdominal computed tomography (CT) scanning may be appropriate in patients with uncharacterized persistent diarrhea to exclude IBD or as an initial approach in patients with suspected noninfectious acute diarrhea.
Fluid and electrolyte replacement are of central importance to all forms of acute diarrhea.
Oral sugar-electrolyte solutions (iso-osmolar sport drinks or designed formulations) should be instituted promptly with severe diarrhea to limit dehydration, which is the major cause of death.
Profoundly dehydrated patients, especially infants and the elderly, require IV rehydration.
In moderately severe nonfebrile and nonbloody diarrhea, antimotility and antisecretory agents such as loperamide can be useful adjuncts to control symptoms.
Such agents should be avoided with febrile dysentery, which may be prolonged by them, and should be used with caution with drugs that increase levels due to cardiotoxicity.
Bismuth subsalicylate may reduce symptoms of vomiting and diarrhea but should not be used to treat immunocompromised patients or those with renal impairment because of the risk of bismuth encephalopathy.
Judicious use of antibiotics is appropriate in selected instances of acute diarrhea and may reduce its severity and duration.
Many physicians treat moderately to severely ill patients with febrile dysentery empirically without diagnostic evaluation using a quinolone, such as ciprofloxacin (500 mg bid for 3–5 d).
Empirical treatment can also be considered for suspected giardiasis with metronidazole (250 mg qid for 7 d).
Selection of antibiotics and dosage regimens are otherwise dictated by specific pathogens, geographic patterns of resistance, and conditions found.
Newer agents such as nitazoxanide may be required for Giardia and Cryptosporidium infections because of resistance to first-line treatments.
Antibiotic coverage is indicated, whether or not a causative organism is discovered, in patients who are immunocompromised, have mechanical heart valves or recent vascular grafts, or are elderly.
Bismuth subsalicylate may reduce the frequency of traveler’s diarrhea.
Antibiotic prophylaxis is only indicated for certain patients traveling to high-risk countries in whom the likelihood or seriousness of acquired diarrhea would be especially high.
Use of ciprofloxacin, azithromycin, or rifaximin may reduce bacterial diarrhea in such travelers by 90%, though rifaximin is not suitable for invasive disease but rather as treatment for uncomplicated traveler’s
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Infectious
Sure, here are some additional sub points for each category of infectious agents:
- Travelers:
- Enterotoxigenic E. coli (ETEC) and enteroaggregative E. coli (EAEC)
- Campylobacter
- Shigella
- Aeromonas
- Norovirus
- Coronavirus
- Salmonella
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Vibrio cholerae
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Consumers of certain foods:
- Salmonella (from chicken, eggs)
- Campylobacter (from undercooked hamburger)
- Shigella (from undercooked pork)
- Enterohemorrhagic E. coli (EHEC) O157:H7 (from undercooked hamburger)
- Bacillus cereus (from fried rice or other reheated food)
- Staphylococcus aureus (from mayonnaise or creams)
- Listeria monocytogenes (from fresh or frozen uncooked foods, mushrooms, or dairy products)
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Vibrio species (from seafood, especially if raw)
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Immunodeficient persons:
- Mycobacterium species
- Cytomegalovirus
- Adenovirus
- Herpes simplex virus
- Cryptosporidium
- Isospora belli
- Microsporidia
- Blastocystis hominis
- Neisseria gonorrhoeae
- Treponema pallidum
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Chlamydia
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Daycare attendees and their family members:
- Shigella
- Giardia
- Cryptosporidium
- Rotavirus
- Adenovirus
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Norovirus
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Institutionalized persons:
- Clostridioides difficile (C. difficile)
- Norovirus
- Rotavirus
- Adenovirus
- Salmonella
- Shigella
- Campylobacter
- Vibrio cholerae
Additionally, some infectious agents may cause specific clinical features: - Small-bowel hypersecretion: preformed bacterial toxins, enterotoxin-producing bacteria, and enteroadherent pathogens (resulting in profuse, watery diarrhea) - Marked vomiting and minimal or no fever: preformed bacterial toxins and enterotoxin-producing bacteria - Abdominal cramping or bloating, higher fever: enteroadherent pathogens - High fever and abdominal pain: cytotoxin-producing and invasive microorganisms - Bloody diarrhea (dysentery): invasive bacteria and Entamoeba histolytica - Severe abdominal pain with tenderness mimicking acute appendicitis: Yersinia invades the terminal ileal and proximal colon mucosa
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Other
Here's a simplified list of causes of different types of gastrointestinal symptoms:
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Heartburn: Opportunistic fungal or viral esophageal infections, GERD, hiatal hernia, peptic ulcer disease, and gastritis.
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Odynophagia (painful swallowing): Opportunistic fungal or viral esophageal infections.
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Upper abdominal pain: Biliary colic, pancreatic disease (chronic pancreatitis, malignancy), hepatocellular carcinoma, Ménétrier’s disease, infiltrative diseases (sarcoidosis, mastocytosis, eosinophilic gastroenteritis), mesenteric ischemia, thyroid and parathyroid disease, and abdominal wall strain.
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Nausea and vomiting: Gastroparesis, viral or bacterial gastroenteritis, chemotherapy-induced nausea and vomiting, motion sickness, and vestibular disorders.
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Gas, bloating, and discomfort: Intestinal lactase deficiency, intolerance of other carbohydrates (e.g., fructose, sorbitol), and small-intestinal bacterial overgrowth.
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Dyspepsia (indigestion): Peptic ulcer disease, gastritis, GERD, celiac disease, nonceliac gluten sensitivity, pancreatic disease (chronic pancreatitis, malignancy), hepatocellular carcinoma, Ménétrier’s disease, infiltrative diseases (sarcoidosis, mastocytosis, eosinophilic gastroenteritis), mesenteric ischemia, thyroid and parathyroid disease, and abdominal wall strain.
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Other causes of indigestion: Congestive heart failure and tuberculosis.
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Intraperitoneal
Sure, here are some variants and examples of the conditions mentioned in the text:
Intraperitoneal Disorders: - Ulcers: peptic ulcers, stress ulcers - Malignancy: stomach cancer, colon cancer - Benign or malignant tumors: intestinal tumors, colon polyps - Inflammatory diseases: Crohn's disease, ulcerative colitis - Superior mesenteric artery syndrome: Wilkie's syndrome - Median arcuate ligament syndrome: Dunbar syndrome - Biliary colic: gallstones, cholecystitis - Enteric infectious causes: norovirus gastroenteritis, bacterial food poisoning (e.g. Staphylococcus aureus, Bacillus cereus), cytomegalovirus enteritis
Gut sensorimotor dysfunction: - Gastroparesis: diabetic gastroparesis, idiopathic gastroparesis, postsurgical gastroparesis - Intestinal pseudoobstruction: Ogilvie's syndrome, chronic idiopathic intestinal pseudoobstruction, secondary pseudoobstruction (e.g. from scleroderma, amyloidosis, small-cell lung carcinoma) - Gastroesophageal reflux: GERD - Irritable bowel syndrome: IBS - Chronic constipation: functional constipation, slow-transit constipation
Other functional gastroduodenal disorders: - Chronic nausea vomiting syndrome: functional nausea vomiting disorder - Cyclic vomiting syndrome: CVS - Cannabinoid hyperemesis syndrome: CHS - Rumination syndrome: regurgitation disorder
Extraperitoneal Disorders: - Myocardial infarction: heart attack - Congestive heart failure: CHF - Postoperative emesis: postoperative nausea and vomiting (PONV) - Increased intracranial pressure: intracranial hypertension, pseudotumor cerebri - Anorexia nervosa: restrictive eating disorder - Bulimia nervosa: binge-eating disorder
Medications and Metabolic Disorders: - Analgesics: opioids, nonsteroidal anti-inflammatory drugs (NSAIDs) - Antibiotics: macrolides, fluoroquinolones, tetracyclines - Cardiac antiarrhythmics: amiodarone - Antihypertensives: calcium channel blockers, ACE inhibitors, beta blockers - Oral hypoglycemics: sulfonylureas, meglitinides - Antidepressants: selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs) - Smoking cessation drugs: varenicline, nicotine replacement therapy (NRT) - Contraceptives: combined oral contraceptives (COCs), progestin-only contraceptives (POCs) - Cancer chemotherapy: cisplatin, carboplatin, paclitaxel, docetaxel, doxorubicin - Metabolic disorders: pregnancy (nausea of pregnancy, hyperemesis gravidarum), uremia, diabetic ketoacidosis, Addison's disease, hypoparathyroidism, hyperthyroidism, hypothyroidism - Circulating toxins: fulminant liver failure, enteric bacterial infections (e.g. Salmonella, Shigella, Escherichia coli), ethanol intoxication.
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MECHANISMS
Start | |---Brainstem nuclei (including the nucleus tractus solitarius; dorsal vagal and phrenic nuclei; medullary nuclei regulating respiration; and nuclei that control pharyngeal, facial, and tongue movements) | |---Coordinate initiation of emesis | |---Neurokinin NK1 pathway | |---Serotonin 5-HT3 pathway | |---Endocannabinoid pathway | |---Vasopressin pathway | |---Activators of emesis | |---Emetic stimuli act at several sites | | | |---Unpleasant thoughts or smells (brain) | | | |---Motion sickness and inner ear disorders (labyrinthine pathways) | | | |---Gastric irritants and cytotoxic agents (gastroduodenal vagal afferent nerves) | | | |---Nongastric afferents (bowel obstruction and mesenteric ischemia) | | | |---Bloodborne stimuli (area postrema) | |---Neurotransmitters mediating vomiting are selective for different sites | |---Vestibular muscarinic M1 and histaminergic H1 receptors (labyrinthine disorders) | |---5-HT3 receptors (vagal afferent stimuli) | |---5-HT3, M1, H1, and dopamine D2 subtypes (area postrema) | |---NK1 receptors in the CNS (nausea and vomiting) | |---Cannabinoid CB1 pathways (cerebral cortex and brainstem) | |---Somatic and visceral muscles respond stereotypically during emesis | |---Inspiratory thoracic and abdominal wall muscles contract | |---Distally migrating gut contractions are abolished | |---Orally propagating spikes evoke retrograde contractions to facilitate expulsion of gut contents | |---Therapies for vomiting act on receptor-mediated pathways End
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ausea is the feeling of a need to vomit. Vomiting (emesis) is the oral expulsion of gastrointestinal contents resulting from gut and thoracoabdominal wall contractions. Vomiting is contrasted with regurgitation, the effortless passage of gastric contents into the mouth. Rumination is the repeated regurgitation of food residue, which may be rechewed and reswallowed. In contrast to emesis, these phenomena exhibit volitional control. Indigestion encompasses a range of complaints including nausea, vomiting, heartburn, regurgitation, and dyspepsia (symptoms thought to originate in the gastroduodenal region). Some individuals with dyspepsia experience postprandial fullness, early satiety (inability to complete a meal due to premature fullness), bloating, eructation (belching), and anorexia. Others report predominantly epigastric burning or pain. Nausea, vomiting, and dyspepsia have been correlated with a condition now called avoidant/restrictive food intake disorder.
- Nausea: the sensation or feeling of an urge to vomit.
- Vomiting (emesis): the act of expelling the contents of the stomach through the mouth due to the contraction of the gastrointestinal and thoracoabdominal muscles.
- Regurgitation: the effortless movement of food or liquid from the stomach back into the mouth without the forceful contractions seen in vomiting.
- Rumination: the repeated regurgitation of food residue, which may be rechewed and reswallowed voluntarily.
- Indigestion: a collection of symptoms that includes nausea, vomiting, heartburn, regurgitation, and dyspepsia. Dyspepsia is a group of symptoms that originate in the gastroduodenal region and include postprandial fullness, early satiety, bloating, eructation, and anorexia. Epigastric burning or pain may also be present.
- Avoidant/restrictive food intake disorder: a condition in which individuals have difficulty consuming certain types of food or food in general, leading to weight loss or nutritional deficiencies. Nausea, vomiting, and dyspepsia have been associated with this disorder.
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Oral
summary Oropharyngeal Dysphagia: - Poor bolus formation and control, drooling, and difficulty initiating swallowing are characteristic signs. - May result in premature spillage of food into the hypopharynx, aspiration into the trachea, or regurgitation into the nasal cavity. - Causes include neurologic, muscular, structural, iatrogenic, infectious, and metabolic factors, with iatrogenic, neurologic, and structural pathologies being the most common. - Iatrogenic causes include head and neck cancer treatments such as surgery and radiation. - Neurogenic dysphagia resulting from cerebrovascular accidents, Parkinson’s disease, and amyotrophic lateral sclerosis is a major cause of morbidity related to aspiration and malnutrition. - Asymmetry in the cortical representation of the pharynx provides an explanation for the dysphagia that occurs as a consequence of unilateral cortical cerebrovascular accidents. - Structural lesions causing dysphagia include Zenker’s diverticulum, cricopharyngeal bar, and neoplasia. - Rapid-sequence fluoroscopy is necessary to evaluate for functional abnormalities. - Adequate fluoroscopic examination requires that the patient be conscious and cooperative. - Timing and integrity of pharyngeal contraction and opening of the UES with a swallow are analyzed to assess both aspiration risk and the potential for swallow therapy. - Structural abnormalities of the oropharynx should be assessed by direct laryngoscopic examination.
Esophageal Dysphagia: - The adult esophagus measures 18-26 cm in length and is anatomically divided into the cervical esophagus and the thoracic esophagus. - Solid food dysphagia becomes common when the lumen is narrowed to <13 mm. - The most common structural causes of dysphagia are Schatzki’s rings, eosinophilic esophagitis, and peptic strictures. - Propulsive disorders leading to esophageal dysphagia result from abnormalities of peristalsis and/or deglutitive inhibition, potentially affecting the cervical or thoracic esophagus. - Rapid-sequence fluoroscopy is necessary to evaluate for functional abnormalities. - Adequate fluoroscopic examination requires that the patient be conscious and cooperative. - High-resolution manometry is used to measure pressure changes along the length of the esophagus during swallowing. - Structural abnormalities of the esophagus should be assessed by endoscopic examination.
Here's a table summarizing the information:
| Category | Oropharyngeal Dysphagia | Esophageal Dysphagia | | --- | --- | --- | | Signs and Symptoms | Poor bolus formation and control, drooling, difficulty initiating swallowing | Solid food dysphagia, potentially accompanied by altered esophageal sensation, reduced distensibility, or motor dysfunction | | Causes | Neurologic, muscular, structural, iatrogenic, infectious, metabolic | Structural causes include Schatzki’s rings, eosinophilic esophagitis, and peptic strictures; propulsive disorders due to abnormalities of peristalsis and/or deglutitive inhibition | | Iatrogenic Causes | Head and neck cancer treatments such as surgery and radiation | N/A | | Diagnosis | Rapid-sequence fluoroscopy, direct laryngoscopic examination | Rapid-sequence fluoroscopy, high-resolution manometry, endoscopic examination |
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iron-bearing transferrin interacts with its receptor
- Iron is transported in the blood by the iron-transferrin complex.
- The complex interacts with specific transferrin receptors on the surface of cells that express transferrin receptors, such as developing erythroblast cells.
- The iron-bearing transferrin is internalized via clathrin-coated pits and transported to an acidic endosome.
- Iron is released from the transferrin at the low pH of the endosome.
- Iron is made available for heme synthesis.
- The transferrin-receptor complex is recycled to the surface of the cell.
- The bulk of the transferrin is released back into circulation, and the transferrin receptor re-anchors into the cell membrane.
- Iron in excess of the amount needed for hemoglobin synthesis binds to a storage protein, apoferritin, forming ferritin.
- Senescent red cells are recognized by the cells of the reticuloendothelial system and undergo phagocytosis.
- Hemoglobin is broken down, and the iron is shuttled back to the surface of the RE cell.
- Iron is presented to circulating transferrin via the iron export channel, ferroportin.
- Iron is then available for reutilization for hemoglobin synthesis
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eLife assessment
This work explores how centrosomes, which function as the primary microtubule organizing center in animal cells, regulate cell division by examining the process in cells in which centrosome formation has been inhibited. The carefully conducted experiments provide convincing support for the important observation that elongated, but successful, mitosis observed in cells lacking centrosomes is due to delays in cell cycle progression, though the reviewers highlight some caveats that merit further discussion.
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eLife assessment
This important work provides evidence that artificial recurrent neural networks can be used to investigate neural mechanisms underlying reversible remapping of spatial representations. Authors perform convincing state of the art analyses showing how population activity preserves the encoding of spatial position despite remappings due to the tracking of an internal variable. This paper will be of interest to neuroscientists studying contextual computations, neural representation of space and links between artificial neural networks and the brain.
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eLife assessment
This behavioral modeling study investigates how humans make decisions on the difficulty of perceptual categorization tasks. The study finds that such judgments are best described by an evidence-accumulation model that includes a dynamic comparison of difficulty-related evidence, which terminates when the difference in evidence between two tasks reaches a predetermined bound - a valuable finding for research in perceptual decision-making. The paper provides solid behavioral evidence for the proposed model, but reviewers noted some potential improvements in the model selection procedure and the relation of the optimal model of the task to the human data, and to the best-fitting model.
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eLife assessment
This paper presents an important finding that Styxl2, a poorly characterized pseudo-phosphatase, plays a role in the sarcomere assembly by promoting autophagic degradation of non-muscle myosins. The evidence supporting the conclusions is convincing. This work will be of interest to biologists working on muscle development, cell biology, and proteolysis.
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eLife assessment
This valuable work fills a gap in the mapping of gene expression patterns in the early embryo of C. elegans. The presented data are solid and provides a resource for future analysis. The manuscript can still be improved in order to strengthen some of the conclusions made.
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eLife assessment
In this important study, the authors provide convincing evidence that current DNA-based microbial genomics for skin bacteria cannot always detect the source of sequenced DNA and whether it originated from viable or non-viable bacteria. Additionally, the authors demonstrated in humans and mice that most of the viable bacteria reside inside hair follicles rather than the surface of the skin per se. Overall, the work has significance beyond a single discipline and will be of interest to those studying microbiomes.
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eLife assessment
This important study provides exciting first-time evidence linking palmitate-induced insulin resistance to ceramide accumulation within the mitochondrial compartment and subsequent depletion of CoQ, an essential component of mitochondrial respiration. Whereas the results and interpretations are generally solid, the mechanistic aspect of the work and conclusions put forth rely heavily on in vitro studies performed in cultured L6 myocytes, which are highly glycolytic and generally not viewed as a good model for studying muscle metabolism and insulin action. Nonetheless, the findings offer intriguing new insights into mechanisms that connect ceramides to both insulin resistance and mitochondrial dysfunction, and are likely to open new avenues of preclinical/clinical research with broad therapeutic implications.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors provide a new powerful tool as well as a large database that should be useful to the neuroscience community, but not only. The authors developed and applied a methodology to automatically estimate the volume, cell number, and density of mice brains from multiple regions, by detecting the native fluorescence of the cell nuclei. Using this platform, they analyzed an existing dataset containing multiple mouse brains, available in the Allen Mouse Connectivity project. The data provides a comprehensive neuroanatomical comparison of brain nuclei between males and females, between hemispheres, and between 2 strains of lab mice.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In its current form, the reviewers felt that the work describing the use of a CycleGAN for alignment of neural activity from a neural interface across sessions was useful, with solid evidence showing that it improved performance over similar-concept previous approaches.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is an interesting and valuable study describing the importance of a focal adhesion protein vinculin in osteocytes in controlling bone formation by regulating the expression of sclerostin, which inhibits bone formation. The data are generally convincing and support the conclusions. Some additional investigation and discussions are required to further strengthen the conclusion and interpretation.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Small subthreshold dendritic-somatic depolarizations can propagate to presynaptic nerve endings and may modulate transmitter release, but the mechanisms of this modulation remain poorly understood because the technical challenge of recording from small bouton synapse. Here the authors directly record from small cerebellar bouton terminals In paired somatic and presynaptic recordings, they demonstrate that small synaptic potentials can travel within 2 to 3 ms to the bouton and arrive there with an amplitude attenuated by 20 to 70% with respect to the somatically recorded potential. As expected, this amplitude attenuation depends on axon length. In recordings of MLI-Purkinje cell pairs the authors further demonstrate that small somatic subthreshold depolarizations of about 20 mV size can enhance AP-triggered IPSCs recorded in the Purkinje cells and change synaptic plasticity during AP trains. In order to address mechanisms of such presynaptic modulation, the authors measure presynaptic AP waveforms via cell attached recordings and found these very stable. On the other hand, presynaptic ICa(V) directly recorded in voltage-clamped MLI boutons facilitated in response to small pre-depolarizations and such facilitated ICa(V) produced larger IPSCs in paired recordings of MLI boutons and coupled Purkinje cells. The authors propose that an accumulation of partially gated channels during small presynaptic depolarizations is able to produce more rapid gating of VGCCs during the AP waveform on arrival of an invading presynaptic AP.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The phenomenon of summit disease, where complex animal behaviours are controlled by single-celled parasites, captivates biologists and non-scientists alike. In this valuable study, the authors use a laboratory model (Drosophila melanogaster infected with Entomophthora muscae) for this disease to provide compelling evidence for the neuroanatomical and physiological underpinnings of summit disease. This is an excellent example of how seemingly intractable questions in behavioural ecology can be effectively addressed in laboratory settings using decades of work in creating 'models' for biology.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is an important report on the discovery of a strong sensitizing effect of cannabidiol on the activation of TRPV2 channels by 2-APB. The conclusions are convincingly supported by solid electrophysiological recordings and cryo-EM structures, but identification of a clear molecular mechanism will require additional structural work. The paper will be of interest to the ion channel research community.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
This valuable paper uses a cohort of SARS-CoV-2 infected people to link immune signatures 3 months post-infection with persistent, long COVID-19 symptoms. The strength of the evidence presented is solid based on a wide array of immunologic assays and a strategically designed cohort, with some claims that are incomplete based on a lack of specifically designed endpoints, lack of analysis of regulatory signals, and incomplete use of control samples. A couple of findings are novel and will be of interest to clinicians and immunologists, particularly that degree of inflammation at 3 months does not impair the generation of SARS-CoV-2 humoral and cellular memory responses and that cellular immune signatures are only somewhat correlated with long COVID-19 symptoms.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Protein abundance is the result of many layers of regulation, including at the levels of transcription, mRNA stability, translation and protein degradation. Many transcripts contain short upstream ORFs (uORFS), but their effects on the translation of the main ORFs are difficult to predict as they are sometimes negative, positive and of different magnitudes. Here, the authors identify features of uORFs using massively parallel reporter assays, and these features help predict uORF effects on translation of main ORFs. The results will be an important resource for the community of researchers using this model organism and for the molecular and cell biology community in general as they allow to better understand how genes are regulated. There are also areas in which the authors' claims or conclusions are not fully justified and require either additional statistical analysis or new experimentation.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study was designed to examine the bypass of Ras/Erk signaling defects that enable limited regeneration in a mouse model of hepatic regeneration. This hepatocyte proliferation is associated with the expression by groups of cells of mRNA-loaded CD133+ intracellular vesicles that mediate an intercellular signaling pathway that supports proliferation. These are new observations, supported by convincing data, that have broad significance to the fields of regeneration and cancer.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable study presents a novel and theoretically interesting model to account for viral diversity within hosts in evolutionary and genomic analyses of pathogens. The simulation results presented are solid, although there are some aspects of the methodology that require further investigation in order to establish their validity. The application to SARS-CoV-2 shows promise, but would benefit from further evaluation.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents the important finding that gene editing could be used to activate delta-globin expression to treat disorders of red blood cell synthesis. The evidence supporting the claims of the authors is solid, particularly in the immortalized cell lines, although inclusion of a larger number of donor patient samples may have strengthened the conclusions that were able to be drawn from the primary cell experiments. The data show this approach to have promise and identify avenues of effort that could be pursued to advance it to a clinical strategy for hemoglobinopathy treatment.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Early life stress can have profound effects on animal behavior, including potential influences on individuality. In this valuable work, the authors use a rich new dataset to solidly demonstrate that the behavioral consequences of early life stress in C. elegans can be buffered by neuromodulators previously implicated in patterns of individuality. While much remains to be learned about the mechanisms by which stress might influence individuality, these studies provide an important entry point that will be of interest to neurobiologists studying interactions between behavior, neuromodulation, stress, and individuality.
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www.biorxiv.org www.biorxiv.org
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eLife Assessment:
In addition to identifying several components regulated by checkpoint kinases, the authors identify a novel non-canonical activation mode for the central checkpoint kinase Rad53, a phosphorylation event that does not depend on Mec1 and instead depends on proteins involved in retrograde signaling through Rtg3. The study thus reveals unanticipated complexities in the DNA replication stress response. Overall, the work is well done and the data support the main conclusions.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Reao et al. investigate a question that has long puzzled neuroscientists: what features of ongoing brain activity predict trial-to-trial variability in responding to the same sensory stimuli? The data demonstrate that the outcome of the previous trial, specifically a miss, allows these associations to be seen - while a correct response appears less likely to do so. and this is a valuable advance in our understanding of the relationship between brain state, behavioral state, and performance. Technically, the study is solid, ie, the methods, data and analyses broadly support the claims, with some weaknesses remaining.
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- Apr 2023
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github.com github.com
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To summarize what I have read here (correct me if I am wrong) @mayhewluke described some real drawbacks of how derivations are currently implemented: Derivations cannot use a specific version of a package. Derivations are limited to a very small subset of real versions for dependencies.
This entire comment is gold
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The important study by Barreat and Katzourakis examines the evolutionary history of eukaryotic viruses (and related mobile elements) in the Bamfordvirae kingdom, and evaluates potential alternative scenarios regarding the origin of different lineages in this highly diverse kingdom. Through convincing phylogenetic analyses, the authors propose a new evolutionary model for the origin of this kingdom where their last common ancestor is inferred to have been an exogenous, non-virophage DNA virus with a small genome. This work advances our understanding of the deep evolutionary history of viruses, the interaction between viruses and the first eukaryotes, and the diversification of viral lineages.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
ZMYM2 is a transcriptional corepressor but little was known about how it is recruited to chromatin. This study reveals that ZMYM2 homes to distinct classes of retrotransposons bound by the TRIM28 and ChAHP complexes in human cells, an important finding in the field of transcriptional regulation. The evidence supporting the claims of the authors is solid, although inclusion of more functional data would have strengthened the original model proposed.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study represents a valuable mechanistic contribution towards understanding how ribosomal RNA is processed during ribosome biogenesis. The biochemical evidence supporting the major conclusions is solid, but the structural biology data is incomplete and would benefit from more rigorous analysis. After further strengthening, this work would be of interest to cell biologists and biochemists working on ribosome biogenesis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Caveney et al. overexpressed an engineered construct of the human membrane receptor guanyl cyclase GC-C in Hamster cells, co-purified it with endogenous HSP90 and CDC37 proteins and determined the cryo-EM structure of this complex. This important work shows that the pseudo-kinase domain of GC-C associates with CDC37 and HSP90 similarly to how the bona fide protein kinases CDK4, CRAF and BRAF have been shown to interact. The methodology used is state of the art and the evidence presented is convincing.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable study links natural variation in a steroidal glycoalkaloid to disease and insect resistance in potato species. The study design is straightforward and thorough, and the evidence supporting the main conclusions is solid; however, other relevant studies are not discussed with enough context. The work will be of interest to plant biologists and breeders.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In this important study, the authors provide compelling evidence that the interplay between alternative polyadenylation (APA) of mRNA encoding Aurora Kinase A (AURKA) and hsa-let-7a miRNA governs AURKA protein levels. The authors show that short 3'UTR isoform of mRNA encoding AURKA is efficiently translated throughout the cell cycle, while the long 3'UTR isoform is suppressed by hsa-let-7a miRNA in a cell cycle-dependent manner. These findings delineate post-transcriptional mechanisms regulating AURKA expression that may be implicated in increase in AURKA protein that is frequently observed across a variety of cancers.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable paper sheds new light on the growth trajectory of bonobos (Pan paniscus), with explicit contributions to discussions of the exclusivity of certain aspects of growth in modern humans, most specifically with respect to components of the adolescent growth spurt, which may be less human-specific among primates than presumed to this point. The results are solid, based on the largest sample ever considered in the study of bonobo growth and include both morphometric and endocrinological data. This work will be of interest to human evolutionary biologists, primatologists, and researchers studying the ontogeny and evolution of growth and development in general.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study reports useful information on the limits of the organotypic culture of neonatal mouse testes, which has been regarded as an experimental strategy that can be extended to humans in the clinical setting for the conservation and subsequent re-use of testicular tissue. The evidence that the culture of testicular fragments of 6.5-day-old mouse testes does not allow optimal differentiation of steroidogenic cells is compelling and would be useful to the scientific community in the field for further optimizations.
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plato.stanford.edu plato.stanford.edu
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What, then, are we to do? How can we transform a disorganized group into one that is organized enough to take on a collective obligation to prevent harm? A promising solution here might be to revisit the place of individual moral agents in ascribing forward looking collective responsibility in cases where a group is not yet organized enough to be ascribed such responsibility. In particular, we might want to ask how, if at all, individual moral agents might be motivated and even obligated to create the kind of organized collective that is needed here.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study functionally characterizes hemoglobin from Steller's sea cow, a cold-water adapted sirenian that went extinct ~250 years ago. Using ancestral sequence reconstruction, site-directed mutagenesis and biochemical assays to compare Steller's hemoglobin to those from (sub)tropical extant sea cows (all of which are proficient divers despite lacking massive muscle oxygen storage), the authors build a solid case for the molecular basis of cold adaptation, centered around an increased solubility and higher oxygen carrying capacity. Remarkably, a single amino acid replacement would explain most of the distinctive functional features of this hemoglobin, which include a hitherto unknown resistance to DPG. Overall, this work will be of interest to evolutionary biologists, physiologists, and biochemists, as well as an enjoyable and informative read for the general public.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study identifies more than 1500 genes that are differentially transcribed over the cell cycle of the single-celled eukaryotic pathogen, Trypanosoma brucei. Analysis of the two major developmental stages of these pathogens suggests that a core set of genes are similarly regulated in both stages, while many cell cycle-related changes in gene expression were unique to one stage. Intriguingly, the levels of far fewer proteins are differentially regulated over the trypanosome cell cycle, indicating that protein levels are primarily regulated by post-transcriptional processes. The study represents a significant technical advance in analyzing gene expression at the single-cell level in unfractionated trypanosome cultures.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is a fundamental study of the activation process of Nurr1, an orphan nuclear receptor that may be a significant target for the treatment of neurodegenerative disorders. Nurr1 functions as a monomer, but may also heterodimerize with RXR which represses Nurr1 transcriptional activation. The authors provide compelling evidence for Nurr1 activation through ligand-induced dissociation of an inactive Nurr1-RXRa heterodimer. These data will be important for biochemists and cell biologists working on regulatory / activation mechanisms of nuclear hormone receptors.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript is of big interest to physicians and geneticists who may struggle with interpreting the clinical significance of novel or rare missense variants in the TNFAIP3 gene in patients with systemic inflammatory diseases. There is also much debate about the potential mechanisms by which these missense mutations might be pathogenic. El Khour et al. addressed these questions by using a combination of in silico analysis and in vitro functional assays. However, their conclusions require additional experimental support and should be expanded to include other reported likely pathogenic missense variants.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This interesting and important work shows that diacety, a volatile organic compound released by yeast in fermenting fruit, can act as a histone deacetylase (HDAC) inhibitor and trigger wide changes in gene expression, together with suppression neurotoxicity in a Drosophila model of Huntington's disease. While the effects on gene expression changes and degenerative phenotypes are convincingly shown, additional data are required to connect olfactory sensory neurons and odorant receptors with the demonstrated physiological effects of diacetyl.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
Genome-wide association studies on asthma have been challenging due to innate heterogeneity and the syndromic nature of asthma, variable accuracy in phenotyping, and potential gene-environment interactions. Here, the authors identified genetic loci associated with subtypes of childhood wheezing in combined data of multiple birth cohorts, by coupling latent class analysis of clinical phenotypic data with GWAS discovery. A mechanistically plausible genetic locus close to annexin 1 (ANXA1) was associated exclusively with early-onset persistent wheeze and provides new translatable molecular insight into asthma pathogenesis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The findings in this manuscript have important theoretical and practical implications within the fields of bacterial morphogenesis, peptidoglycan, and cytoskeletal function. The evidence presented is convincing and uses validated methodology in line with current state-of-the-art. This manuscript will be of interest to cell biologists studying the cytoskeleton and bacterial morphogenesis.
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www.researchsquare.com www.researchsquare.com
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eLife assessment
This valuable study reports on the role of transposable elements in gene expression variation in rice and how TE-associated expression changes could have been selected during domestication. The combination of evidence from linkage studies and selection scans for a subset of insertions is convincing, although it is currently unclear how large the contribution of TEs to gene expression variability compared to other variants is, which should be reflected in the title. The work will be of interest to colleagues working on the role of transposable elements in adaptation and to biologists working on domestication.
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www.researchsquare.com www.researchsquare.com
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eLife assessment
Necarsulmer et al describe an interesting new mouse model of TDP-43 proteinopathy in which gene editing was used to introduce a K145Q acetylation-mimic mutation previously shown to impair RNA-binding capacity and induce downstream misregulation of target genes. Mice homozygous for this mutation are convincingly shown to display cognitive/behavioral impairment, TDP-43 phosphorylation and insolubility, and changes in gene expression and splicing. This novel mouse model replicates some important hallmarks of human frontotemporal lobar degeneration and will be an important contribution to the field after several points are adequately addressed.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This fundamental work reports the unique finding that specific ligands and receptors in the natriuretic peptide signaling pathway act during early embryogenesis to discriminate between neural crest and cranial placode fates using two distinct mechanisms. This work will be of broad interest to both developmental and cell biologists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Rapan et al. report a new multi-modal parcellation of the macaque frontal cortex based on cytoarchitectural division complemented with functional connectivity and neurochemical data. This builds on prior highly influential maps that subdivide the cortex based on anatomical fingerprints, both confirming these prior reports and defining new subdivisions. As such, this is a fundamental contribution with compelling results that can guide future neuroscientific research into the function of the frontal lobes.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is a valuable study, carried out in a solid and comprehensive manner. The results advance the understanding of one of the steps of the HIV life cycle, via a better description of the mechanisms underlying Gag-Pol dimerization.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study by Mohebi, Collins, and Berke presents valuable findings on the control of the neurotransmitter dopamine by cholinergic interneurons, a sparse but important subclass of neurons with the ventral striatum, a key brain region involved in motivational behaviors. The evidence supporting the claims of the authors is solid, although the inclusion of a key experiment presenting causality between cholinergic neuron activity and dopamine release during behavior is needed. The work will be of broad interest to neuroscientists in the fields of motivation and decision-making.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important paper compares the neural basis for different calling songs in five species of clawed Xenopus frogs using neural activity recordings combined with lesions of pathways and stimulation of specific parts of the circuit. The evidence supporting the claims is mostly solid but in part incomplete. The work will be of broad interest to neurophysiologists beyond the vocalization topic.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In the DNA damage response (DDR) pathway, single-stranded DNAs (ssDNAs) activate a downstream kinase cascade with ATR/Chk1. Replication protein A (RPA) is believed to be essential for DDR activation by recruiting an ATR-partner protein, ATRIP, to RPA-coated ssDNAs through direct protein-protein interaction. This important paper provides convincing results, showing that an AP endonuclease, APE1 (APEX1), plays a role not only in RPA-dependent but also in RPA-independent recruitment of ATRIP on ssDNAs for DDR activation.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study provides a clearly presented and thoughtfully analyzed single cell-resolution dataset of gene expression in wildtype and mutant zebrafish skin. These data are used by the authors to develop and test hypotheses about cell lineage relationships and signaling interactions between cell types in the skin, allowing them to identify roles for several signaling pathways and the hypodermis in scale and pigment cell development. The reviewers have suggestions for clarifications and acknowledging caveats to some experiments, but overall assess the significance of the manuscript to be fundamental and the quality of the data compelling.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents valuable findings on the changes of immune cell populations and stromal cells occurring at the CNS borders in a neonatal bacterial meningitis model, focusing on fibroblasts, macrophages and endothelial cells. The study provides solid snRNA-seq dataset and high quality immune fluorescence images of dissected brain border regions, that will be useful for the community. These observations and datasets will be of interest to the neuro-immunology community.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study represents a valuable body of work in which the authors assemble a molecular description of colorectal cancer and classification into subtypes. Overall, the evidence supporting the findings is solid and could be improved with more detail. Consensus over a diverse range of data from publicly available sources is convincing. When added to existing knowledge this work may contribute to future biomarker discoveries for colorectal cancer.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study advances our understanding of the metabolic and hemodynamic underpinnings of different brain networks. The evidence is convincing, drawn from multiple datasets and including simultaneous fMRI and PET, although the authors should make clear which claims are supported by their evidence and which are speculation based on the literature. The study will be of interest to neuroscientists and researchers who use functional neuroimaging tools to study brain activity.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents useful information on the environmental and epigenomic associations of obesity in children and adolescents. The data were collected and analyzed using a solid and validated methodology and can be referenced at the clinics and health authorities to make a guideline and a policy strategy.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript presents an exciting set of experiments on the mechanisms through which PSD proteins induce actin bundle formation. The work included deep mechanistic analyses which determine the necessity of upper vs. lower levels of PSD proteins for actin bundle formation, identify the domains and interactions of these proteins that are necessary and sufficient to induce actin bundles, and provide a first assessment in neurons of potential roles of the newly discovered mechanisms.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper presents a valuable cross-validation study of mesoscopic measurements of axonal orientations from three different modalities: x-ray tomography, scattered light imaging, and diffusion MRI. The authors show convincing similarities and differences in fibre orientations from all three methods over partial ex vivo brain samples, though as only a single diffusion method is investigated, there is inadequate evidence to support conclusions about diffusion MRI reconstruction methods in general. As a first example of work comparing these three modalities, it is of interest to researchers who want to apply x-ray tomography or scattered light imaging to image the white matter ex vivo or use these methods for future validation of diffusion MRI methods.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study has important implications for the impact of sexual conflict on population viability under different temperatures. The authors propose that male harm to females in sexual conflict can be reduced as a function of temperature within the optimal reproductive range of a species. The evidence for this proposal is currently incomplete because there is methodological detail that needs to be further clarified. The results could have implications for the likelihood of the evolutionary rescue of species facing the climate crisis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors use computational modeling of the mammalian visual system to address an important and understudied problem: how precise temporal properties of synaptic transmission might impact the kinds of neuronal correlations that instruct development. The present description of the simulations provides mixed evidence for the authors' conclusions. That slow NMDA currents help to minimize rapid timescale correlations is compelling, but other aspects of the simulations, such as neuronal heterogeneity may also contribute.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In this important study, the authors generate and analyse single-cell datasets for the human parasitic nematode Brugia malayi. The new resource has the potential to uncover new details of the biology of secretory systems in this filarial nematode but the main claims are only partially supported and strengthening them would require additional experimental support and new analyses. With the methodological part strengthened, the new resource would be of broad interest to parasitologists and nematode biologists and would have the potential to accelerate research in the search of new anthelmintics and vaccines.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
We believe this study has the potential to be fundamental for the field of microbial communication and compelling evidence with the chance of changing the current state-of-the-art in this area has been presented. This is will be of natural interest to the field of parasitology, but scientists in the general area of cell-to-cell communication will certainly benefit from this contribution too. A major strength of this manuscript is the clear demonstration of the role of cytoneme-like structures and extracellular vesicles in parasite communication using the Trichomonas vaginalis model. Given the potential of these findings, the authors could deepen their discussion and perspectives for other areas.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study reports a cutting-edge set of experiments examining evolutionary models of paralog function differentiation for the mammalian ribosomal proteins eS27 and eS27L. No differentiated roles were identified for either paralog, but the paralogs are differentially expressed, and they preferentially associate with different transcript classes. Reciprocal switching of their coding sequences yielded no detectable phenotypes, but loss of either paralog resulted in lethality at different developmental stages, suggesting that subfunctionalized expression patterns underlie the retention of these paralogs. The work will be of interest to colleagues studying the evolution and diversification of ribosomes.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors show that tunneling nanotubes or TNTs are used by cells to transfer full-length mRNAs. The data show that as much as 1% of the endogenous mRNA are passed between cells by this procedure. The transferred mRNA affect the transcriptome of the acceptor cells thus highlighting the significance of this nanotube mediated trafficking of mRNA between cells. We appreciate the difficulty of this exercise. The strength of the presented evidence could be questioned based on technical limitations.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
After mating, animals show a repertoire of behavioural changes. In flies, this includes an increase in egg-laying, salt, and food (particularly protein) consumption, and a concomitant decrease in sexual receptivity. This valuable study compellingly shows that flies also have an increased sugar appetite and they identify the central brain circuitry that controls this increase in the mated condition.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
The large genetic association studies conducted in East Africa have shown that the Dantu blood group provides substantial protection against severe malaria since it increases the surface tension of red blood cells making it harder for malaria parasites to invade. In this important work, the authors show that parasite growth is indeed restricted in vivo by testing this hypothesis in adult Kenyan volunteers infected with P. falciparium under careful monitoring. They were able to show convincingly that indeed, parasite growth was reduced amongst Dantu adults.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Seelbinder et al. describe a new method for perturbing chromatin in living cells by local heating. Employing this approach, the authors uncover interesting behaviors that underscore the variability in the mechanical response of subnuclear domains and structures. The study is timely, and if some conceptual and technical aspects are improved, it should be of broad interest to both the cell biophysics and cell biology communities, in particular since the method can also be applied to study mechanical relationships of subcellular compartments in other cellular and multicellular systems.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents a useful inventory of chromatin modifications and genes that are up- and down-regulated during cerebellar development in vivo and in primary culture. The main claims were incomplete and would benefit from further analysis and/or additional experiments. The work will be of interest to biologists working on brain development.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents important findings regarding the quantification of dynamics in fish communities in changing ecosystems by combining a large-scale environmental DNA metabarcoding time series with novel statistical approaches. The methods are convincing, with controlled experiments, thorough statistical analyses, and a substantial dataset covering two years of detailed observation, which can provide sufficient power to detect fine-scale ecological interactions. This work is relevant for informing future research on assessing community stability under climate change.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors use a combination of structural and MD simulation approaches to characterize phospholipid interactions with the pentameric ligand-gated ion channel, GLIC. The general agreement between structures and simulations increases confidence in the description of the lipid interaction poses, and provides a solid basis for the prediction of a state dependent interaction site where lipids could dynamically modulate channel gating. The results will be very useful to understand the nature of phospholipid interactions with pentameric ligand-gated ion channels, although the functional or structural significance of these lipid interactions remains unclear.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This interesting study builds on previous work by the PI implicating Greatwall/MASTLKinase in recovery from DNA damage in cultured human cells. This study identifies a ubiquitin ligase that may regulate the stability of Greatwall/MASTL protein stability, and the authors propose that this constitutes a molecular "timer" that controls recovery from DNA damage. Should this be validated it would be an important advance for the field, but the data presented are currently incomplete and do not yet fully support this claim.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors have uncovered a new target that may be exploited to selectively kill BRCA2 mutant cancer cells. Strengths of the study include the novel pathway uncovered (ROCK kinases) and the strong data in support of the findings. Weaknesses include limited detail regarding the mechanism of BRCA2-specific cell death by ROCK kinase inhibitors, limited information on why some ROCK kinase inhibitors are not effective, as well as whether the cell killing in BRCA2 wild-type cells by ROCK kinase inhibitors is the same mechanism but just attenuated. The work will be of interest to cancer biologists and colleagues studying kinases.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript is of interest to readers in the field of neural development. The study is important as it examines two mutations within a homeodomain transcription factor called Cone-Rod Homeobox (CRX) that cause retinopathy in humans. The data are solid, and the work contributes to our understanding of the underlying pathogenetic mechanisms.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study combines experiments in developing embryos and embryo extracts to investigate a fundamental relationship in biology - how the size of mitotic chromosomes scales with changes in cell size during development. By combining the unique tools available in the Xenopus system with modern genomic approaches, the authors convincingly demonstrate that mitotic chromosome scaling is mediated by differential loading of maternal chromatin remodeling factors during interphase. Although it remains unclear exactly how these factors impact chromosome size, the findings reported here will be of broad interest to the cell biology community and are likely to spawn new avenues of experimental inquiry aimed at understanding intracellular scaling relationships.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
This study provides important estimates from international cancer screening data repository about the impact of the COVID-pandemic related disruptions on cancer screening programs in selected low- and middle-income countries. The evidence supporting the study is solid and relies on national-level screening program attendee volumes and assessments of screen positives during 2019 (pre-pandemic) and 2020 (during the pandemic). The study provides real-world data estimates of proportions/volumes of missed screenings due to pandemic control measures (lockdowns and closures) and may contribute to future modelling efforts for measuring the impact on late/advanced stage detection and excess case burden and mortality.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper addresses an important clinical concern which is how the antidepressant ketamine exerts its effects acts rapidly. The authors suggest the reason is that ketamine increases glutamatergic transmission in the hippocampus. The strengths are the data are mostly very good, and the limitations are a lack of compelling evidence that the hippocampus is the location where effects occur, as well as several other issues.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study will be of interest to those working on mycobacterial signal transduction. A combination of experiments provides convincing evidence to show how universal stress proteins bind to cAMP and function by direct sequestration of the second messenger. Although the methods, data and analyses broadly support the conclusions, the main claims are only partially supported and can be strengthened through further analytic approaches.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Villalobos-Cantor et. al. describe a new technique for cell-type specific in vivo labeling of nascent peptides, which they call POPPi. POPPi is based on sequence-independent incorporation of the puromycin analog OPP into an elongating peptide, which also simultaneously terminates the growing peptide. To achieve cell-type-specific labeling, the authors used an OPP derivative, PhAc-OPP, as the labeling substrate. The method is potentially interesting but needs further characterization to be able to assess its use.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study combines a screen of known N6-methyladenine (m6A)-dependent RNA modifying factors to identify ALKBH5 as critical in crush injury response. They demonstrate through gain and loss of function an effect on ALKBH5 m6A-dependent Lpin2 mRNA stability during injury-induced axon regeneration in both dorsal root ganglia nerve and optic nerve regeneration. The results provide new insight into the role of RNA modification on neural injury. However, the limitations of the experimental design on the conclusions drawn require additional consideration. With additional control experiments and further consideration of the limitations, the paper will provide a link between N6-methyladenine and neurotrauma.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study describes important results and convincing evidence linking myofibroblast senescence in the aged heart with a pro-arrhythmogenic phenotype. This is in turn related to higher mortality after myocardial infarction in the aged rabbit heart. These constitute important empiric as opposed to detailed findings. They nevertheless will be of interest to clinician scientists studying cardiac function and disease.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Non-communicable diseases (NCDs) are rising rapidly in urbanizing populations in many parts of the developing world, including in sub-Saharan Africa. Temba and colleagues show important evidence that healthy Tanzanians display a pro-inflammatory phenotype with enrichment of specific immune-metabolic pathways. Dood-derived metabolites were identified as an important driver of inflammation-related molecules. These findings provide solid evidence that the dietary transition that occurs in urbanizing areas in sub-Saharan Africa may contribute significantly to the increased incidence of non communicable diseases in this part of the world.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important interdisciplinary study substantially advances our understanding of the prolactin receptor interactions with the membrane lipids and the effect of these interactions on cell signaling. The authors use a combination of state-of-the-art NMR structural analysis, simulations, and cellular assays to provide compelling experimental evidence for protein complexes being regulated by IDR-membrane interactions. The work will be of broad interest to structural biologists and biochemists, and the results presented herein are likely relevant for other non-tyrosine kinase receptors.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study demonstrates that the transcription factor Chinmo is a master regulator that maintains larval growth and development as part of the metamorphic gene network in Drosophila. Chinmo does so in part by regulating Broad expression in imaginal tissues (exemplified in the wing disc) and in a Broad-independent manner in other larval tissues such as the salivary gland. Finally, they demonstrate that the role of Chinmo in promoting larval development is conserved between holometabolous insects and hemimetabolous insects, which lack a pupal stage. The data were collected and analyzed using solid and validated methodology and will be of interest to a broad audience including those interested in development and evolution.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Using surface micropatterning, optical activation, and theoretical analysis, the authors provide compelling evidence that adjacent cells actively propagate mechanical stress in epithelial tissues. The response of the receiver cell is active and enhanced when the principal stress direction is perpendicular to the orientation of actin fibers. This work is important and a must-read for everybody wanting to understand tissue mechanics.
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www.biorxiv.org www.biorxiv.org
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eLife assessment<br /> <br /> This is an important study that uses the song system in a bird model to understand the transcriptional mechanisms underlying neuronal adaptations to sensory deprivation. The manuscript offers compelling data in support of their hypothesis that these transcriptional changes are related to song plasticity. The work will be of interest to biologists who study neuronal plasticity mechanisms.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Inferior olivary neurons drive complex spiking activity in Purkinje neurons of the cerebellar cortex, ultimately playing critical roles in controlling motor coordination and plasticity. Using transgenic mice or optogenetic techniques to independently control a major excitatory and inhibitory pathway to the inferior olive, the authors show that the probability and phase of olivary neuron output depend critically on the relative timing of excitation and inhibitory inputs. Network models predict that appropriately timed excitatory and inhibitory input patterns efficiently synchronize larger clusters of inferior olivary neurons, raising the possibility that input timing can gate the output of the motor commands. These valuable findings have the potential to impact the field's understanding of sensorimotor processing, but the strength of evidence is currently incomplete.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The study provides evidence that the hormone PTH increases bone mass by, at least in part, regulating the factor Zfp467. In turn, Zfp67 controls expression of the receptor for PTH, thus creating a feedback loop that overall augments bone mass. The findings are novel and of potential great interest. Overall, the study is of interest to a broad audience and significant as it unveils a novel feedback loop involving PTH, a critical endocrine regulator of calcium, phosphate, and bone mass.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper describes a new method to investigate Staphylococcus aureus intracellular virulence that has produced important insights into the mechanisms of staphylococcal pathogenesis. The results are convincing and the methodology is state-of-the-art. This paper will be of interest to scientists studying microbial intracellular pathogenesis and cell biology.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This paper demonstrates the genetic architecture of heart mitochondrial proteome that influences cardiac hypertrophy, using a panel of inbred mouse strains called the Hybrid Mouse Diversity Panel (HMDP). The HDM panel is a very powerful tool to study the genetic basis of various physiological and pathological processes in mice. The authors have used this panel extensively before, and in this paper, they extend their proteomic studies to demonstrate the genetic basis of cardiac hypertrophy. The studies will allow us to better understand the genetics of hypertrophic cardiomyopathy.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study greatly expands our knowledge of the fossil record of Mermithid nematodes, modern members of which are ecologically important parasitoids of arthropods, annelids and mollusks today. The most important finding, convincingly presented, is that mermithids parasitized a number of insect clades in the Cretaceous that they are not known to infect today or in Cenozoic amber. The evidence for a shift in exploited hosts from heterometabolous insects in the Cretaceous to holometabolous ones in the Miocene is solid but could be made exceptional by adding a small quantitative analysis with confidence intervals and bar plots from the data already compiled in the supplementary material; potential collection bias should be addressed as well.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This fundamental work uses deep neural networks to simulate activity evoked by a wide range of stimuli and demonstrates systematic differences in latent population representations between hearing-impaired and normal-hearing animals that are consistent with impaired representations of speech in noise. While the evidence supporting the conclusions is compelling, additional analyses would facilitate the generalizability of the neural-network approach. The research will be of interest to auditory neuroscientists and computational scientists.
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www.medrxiv.org www.medrxiv.org
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eLife assessment
This manuscript provides valuable data gathered using a new video fluoroscopy method by which movements of artificial joints can be visualized in real time. These solid data add to the understanding of the links between symptoms of unstable joints after total knee replacement and actual joint instability. The paper should be of interest to those who study biomechanics after total joint replacement.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In this study, Li and al describe valuable insights into the mechanisms underlying sex-differences diet-induced obesity in mice, with a role of macrophage-derived RELMa secretion in female-specific protection. They provide solid evidence for the impact of RELMa signaling in eosinophil recruitment for diet-induced obesity protection in female mice. Single-cell RNA-seq analysis of the stromal vascular fraction of control and RELMa deficient animals methods were used to investigate molecular mechanisms underlying the protection as a powerful method, although the analysis of this data is difficult to evaluate with incomplete methodological information.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In vertebrates, ciliary motility is powered by axonemal dyneins, known as OADs, tethered to doublet microtubules by a pentameric docking complex including the Armc4 and Calaxin subunits. This valuable study combines zebrafish genetics with cryo-electron tomography to convincingly show that Armc4 plays a critical role in the docking of OAD and that Calaxin stabilizes the molecular interaction. The work will be of interest to those studying the structure and function of the axoneme, and motile cilia in general.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study combines behavior, computational modelling and magnetic resonance spectroscopy to address the question whether age-related declines in learning are driven by declines in working memory or deficiencies of the RL system. The general approach is solid, but the presented evidence to support the papers' main claims could be stronger. With additional analyses and adaptation of the main claims, the paper could be of high interest for researchers in the field of cognitive aging and decision making.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors present a manuscript aiming to understand the mechanism(s) underlying myeloid bias in HSCs, specifically focused on the role of Pcgf1, and therefore PRC1.1, in the regulation of hematopoiesis. This important work is of interest to the community of researchers interested in myeloid differentiation, lineage fate decisions in hematopoietic stem cells, and the molecular mechanisms that contribute to the initiation of myeloid malignancies. The methods are rigorous and the results convincingly support the authors' conclusions.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is a valuable paper describing an attempt to reconstruct the evolution of Dicer. Using ancestral reconstruction approaches, the authors carefully examine the biochemical characteristics of reconstructed proteins at various junction points in the animal lineage. They provide solid evidence that the deepest ancestrally reconstructed protein has double-stranded RNA stimulated ATPase activity and that this characteristic was lost along the vertebrate lineage. This paper will be of interest to scientists in the RNA-protein interaction and protein evolution fields.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The authors have established new formulas to predict maximum oxygen uptake for cyclists and runners based on submaximal exercise testing and anthropometric characteristics. This is an important study with a large and comprehensive dataset, which may be helpful for many exercise labs. The work is convincing, using appropriate and validated methodology in line with the current state-of-the-art, as shown by references to common exercise books.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
In the current manuscript, the authors study the effects of hypoxia or genetic and pharmacologic modulation of the hypoxic pathways on T cells. The findings about T cells sense hypoxia and how hypoxia affects T cell (and CAR T cell) differentiation and function are significant and interesting for the field. The data supporting these findings are mostly robust, yet some questions remain open and some statements seem unsupported by evidence.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This fundamental work substantially advances our understanding of polymer physics underpinnings of genome folding, organization, and regulation. The conclusions are supported by both convincing computer simulations and analytical theory. The work will be of significant interest to the genome folding community.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript will be of interest to scientists in the field of tissue injury and repair. It provides novel molecular mechanisms of a transcription factor, Prrx1, in fibroblast activation following lung injury. Overall, the work suggests that PRRX1 plays a functional role downstream of TGFb1 to elicit some aspects of the fibrotic response and that PRRX1 could represent an important therapeutic target to treat fibrosis. The strengths of this work are the multiple approaches applying human and mouse lung tissue used by the authors to test the role of PRRX1 in lung fibrosis, however, in its current form, major limitations need to be addressed.
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www.biorxiv.org www.biorxiv.org
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eLife Assessment
The study has advanced our mechanistic understanding of lung regeneration. While the importance of regeneration of alveolar capillaries for long response to injury has been long recognized, the regulation of this process has not been well understood. Your study provides novel, comprehensive, and compelling evidence that the expression of the transcription factor Atf3 in alveolar capillary endothelial cells plays a critical role in the regeneration of alveolar capillaries following lung injury.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study concerns an important area, that of monoallelic expression, but the study does not provide sufficient information about the candidate regulatory RNA to provide a significant advance over previous work, which should also be discussed in more detail.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study provides convincing evidence that locus coeruleus is activated during visuomotor mismatches. Gain of function optogenetic experiments complement this evidence and indicate that locus coeruleus could be involved in the learning process that enables visuomotor predictions. This study, therefore, sets the groundwork for the circuit dissection of predictive signals in the visual cortex. Loss-of-function experiments would strengthen the evidence of the involvement of locus coeruleus in prediction learning. These results will be of interest to systems neuroscientists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
The study examines the principles according to which neurons connect to each other in the brain. The authors find that data could be best explained by the homophillic wiring principle where neurons preferentially connect to neurons within overlapping groups. The work will provide a valuable resource to the neuroscience community once analyses are standardized across various datasets included.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable work advances our understanding of the acoustic features driving the attraction of female mice to male vocalizations. The evidence supporting the conclusions is solid, with well-designed place preference assays and manipulations of male song structure. The work will be of broad interest to neurobiologists and ethologists working on mouse social interactions, auditory processing and communication.
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52.53.155.43 52.53.155.43
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eLife assessment
This manuscript combines cryo-EM and a suite of compelling whole cell and proteoliposome transport assays to establish the mechanism and structure of the full-length human SLC26A6 chloride/bicarbonate exchangers, including the first partial view of the previously unresolved IVS region of an SLC26 STAS domain. In combination with prior studies on additional SLC26 paralogs, including the SLC26A9 paralog initially reported by the same group, the current study provides important insight into the mechanistic diversity of the SLC26 transporters. This study is of interest to the biophysics community and the field of membrane transport.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study evaluated how naturalistic behaviors are encoded in the striatum by analyzing neural ensembles engaged during grooming behavior. The study shows that neural responses are highly heterogeneous during grooming, but ensembles were detected in which units were more correlated during grooming than during the entire session. This study presents an important contribution to the field by shedding light on how ensembles of neurons encode innate behavior. The results are convincing.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study uses an innovative genome-wide approach and targeted testing to identify S. aureus genes that affect susceptibility to serum, serum-derived antimicrobial products, and commonly used antibiotics. The findings are significant in that they highlight evidence of evolution of virulence determinants in the setting of exposure to host stressors expected to be present during bacteremia and antibiotic therapy. The evidence is solid, but the presentation could be improved by providing details that clarify the methods and highlighting the limited current understanding of the major target, tcaA.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This contribution provides important insights into the thermodynamic landscape of cation transporters of the Cation Diffusion Facilitator (CDF) superfamily, together with a detailed structural investigation of the role of the three zinc(II) binding sites of YiiP. Despite the relatively low resolution of the cryo-EM structures presented in this work, the combination of structural, functional and modeling techniques yields solid evidence for the proposed model. This work will be of interest to biologists and biophysicists that work with membrane transporters; it is an excellent example of how different techniques can be combined to obtain relevant information on the complex mechanism of action of a transporter.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study combines behavioral and imaging experiments to understand how levels of important brain chemicals shape the processing of information in the brain in children and young adults. The sample size and data quality are outstanding and some of the data are quite convincing. However, the calculation and interpretation of the brain chemical concentration measurements as well as the interpretation of the model-based behavioral parameters are not fully justified and support for the overall conclusions is incomplete. This work will be of interest to neuroscientists, psychologists, and neuroimaging researchers investigating the developing brain in health and disease.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This is a valuable addition to the literature as it helps us understand the role of tRNA modifying enzymes in Mycobacterium tuberculosis. By knocking out one of the enzymes, the authors convincingly demonstrate the importance of tRNA-modifying enzymes for intra-host growth of tubercle bacteria. Some of the claims regarding modification as well as the role in virulence could be strengthened through further bioinformatics and phylogenetic analyses as well as experimental approaches. The work will be of interest to microbiologists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Müller glial cells of the zebrafish retina can differentiate into all neural cell classes following injury, providing full regenerative capabilities of the zebrafish retina. This study presents a valuable description of transcriptional changes of Müller glia cells in the adult and regenerating retina using single-cell RNA sequencing. The overall evidence supporting the main claims of the authors is solid, but some aspects of the analysis are incomplete and would benefit from additional experimental evidence to support the existence of different types of Müller glia and their distribution in the retina.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This valuable study provides insights into mechanisms of placental aging and its relationship to labor initiation. The authors provide solid evidence and have thoroughly investigated the molecular characteristics of normal placental aging using in vivo and in vitro model systems and human placental tissue analysis to corroborate their findings. This work contributes to existing work in placental aging and preterm birth and will be of interest to reproductive scientists.
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www.biorxiv.org www.biorxiv.org
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eLife assessment:
This valuable study presents convincing evidence that metabolite levels in Escherichia coli bacteria from a long-term evolution experiment have changed in consistent ways, which in turn can be explained by recurrent mutations in regulatory genes that affect enzyme expression levels. The use of high-resolution mass spectrometry measuring bulk metabolite levels, in combination with existing gene expression and DNA sequencing datasets provides valuable information linking changes in an organism's genome, transcriptome, and metabolome. The current version of the paper lacks clarity in parts, most critically in the introduction, and would benefit from some rewriting to improve its structure, precision, and readability.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study reports important findings regarding the systemic function of hemocytes controlling whole-body responses to oxidative stress. The evidence in support of the requirement for hemocytes in oxidative stress responses as well as the hemocyte single-nuclei analyses in the presence or absence of oxidative stress are convincing. In contrast, the genetic and physiological analyses that link the non-canonical DDR pathway to upd3/JNK expression and high susceptibility, and the inferences regarding the function of hemocytes in systemic metabolic control are incomplete and would benefit from more rigorous approaches. The work will be of interest to cell and developmental biologists working on animal metabolism, immunity, or stress responses.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
Muroňová et al. provide valuable information about CDCC146 as a centriole and microtubule associated protein essential for sperm flagellar formation and male fertility. Mutations were identified in human patients suffering from MMAF syndrome, but the evidence that these human mutations were causative of the abnormal phenotype is incomplete. To further explore the causality, mouse models are generated and the findings from the mouse study, support that the key roles of CCDC146 for microtubule-based structures throughout sperm development in general but requires statical analysis.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This important study reports investigation of the dynamics of PKA at the single-cell level in in vitro and in epithelia in vivo. Using different fluorescent biosensors and optogenetic actuators, the authors dissect the signaling pathway responsible for PKA waves, finding that PKA activation is a consequence of PGE2 release, which in turn is triggered by calcium pulses, requiring high ERK activity. The evidence supporting the claims is solid. At this stage the work is still partly descriptive in nature, and additional measurements would increase the strength of mechanistic insights and physiological relevance.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This manuscript reports important findings regarding the potential for self-policing and a division of labor among biofilm-inhabiting Bacillus cells. Overall, this work is robust in its use of various techniques and provides solid insights into the intersections of well-understood regulatory controls and the suppression of cheaters. Despite some concerns about the data, all reviewers were excited by the potential impact of this work. Colleagues interested in microbial social interactions should find this study's narrative about the internal mediation of cell differentiation particularly valuable.
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www.biorxiv.org www.biorxiv.org
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eLife assessment
This study presents important findings on the mechanism as to how Mycobacterium-containing vacuoles are recognized by host cell factors and subjected to membrane repair or autophagic degradation using Dictyostelium discoideum as a useful model. The evidence for the role of TrafE in damaged-membrane repair and xenophagy induction is convincing, but that in autophagosome closure is rather incomplete.
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www.biorxiv.org www.biorxiv.org
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eLife Assessment:
Zemel and colleagues provide a report on the fundamental electrophysiological properties of motor neurons driving song in the zebrafish and provide complementary information about cell morphology, pharmacological sensitivity, and ion channel expression and heterogeneity. They provide mainly convincing data supporting the claim of a particular ion channel class, Kv3, that plays an important role in fast electrical spiking (action potentials) in song-related neurons.
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