eLife assessment

This work provides a valuable analysis of the effect of two commonly used hyperparameters, noise amplitude and firing rate regularization, on the representations of relevant and irrelevant stimuli in trained recurrent neural networks (RNNs). The results suggest an interesting interpretation of prefrontal cortex (PFC) dynamics, based on comparisons to previously published data from the same lab, in terms of decreasing metabolic cost during learning. The evidence indicating that the mechanisms identified in the RNNs are the same ones operating in PFC was considered incomplete, but could potentially be bolstered by additional analyses and appropriate revisions.

eLife assessment

This important study investigates the transcriptional changes in neurons that underlie loss of learning and memory with age in C. elegans, and how cognition is maintained in insulin/IGF-1-like signaling mutants. The presented evidence is convincing, utilizing a cutting-edge method to isolate neurons from worms for genomics that is clearly conveyed with a rigorous experimental approach. Overall, this study supports that older daf-2 worms maintain cognitive function via mechanisms that are unique from younger wild type worms, which will be of interest to neuroscientists and researchers studying ageing.

eLife assessment

The authors present valuable empirical and modelling evidence that statistical learning in speech perception may contain processes like segmentation and anticipation. While the evidence for statistical learning effects is solid, the link between the pattern of effects (both empirical and simulated) and the theoretical concepts of segmentation and anticipation would need to be much stronger to exclude other accounts of the data. This work will be of broad interest to researchers working on, or with, statistical learning, and to any researcher interested in the challenges of whether data and modeling can effectively adjudicate between competing theoretical constructs.

eLife assessment

This important paper presents a thoroughly detailed methodology for mesoscale-imaging of extensive areas of the cortex, either from a top or lateral perspective, in behaving mice. The examples of scientific results to be derived with this method offer promising and stimulating insights. Overall, the method and results presented are convincing and will be of interest to neuroscientists focused on cortical processing in rodents and beyond.

eLife assessment

The authors report valuable findings that temporary pharmacological inhibition targeting the dorsal or intermediate hippocampus in rats disrupted navigation to a goal location in a new virtual place-preference task and that functional inhibition of the intermediate hippocampus is more detrimental than functional inhibition of the dorsal hippocampus. The work has the potential to provide novel insights into function differentiation along the dorsal-ventral axis of the hippocampus. However, the evidence for the paper's claim that the dorsal hippocampus is responsible for accurate spatial navigation and the intermediate hippocampus for place-value associations is currently incomplete.

eLife assessment

This paper reports a valuable set of new results. The main result is that the projection from adult-born granule cells in the dentate gyrus to the hippocampal subfield CA2 is necessary for the retrieval of a social memory formed during development, and solid evidence is provided to support this conclusion.

eLife assessment

In their study, Diana et al. introduce a novel method for spike inference from calcium imaging data using a Monte Carlo-based approach, emphasizing the quantification of uncertainties in spike time estimates through a Bayesian framework. This method employs particle Gibbs sampling for estimating model parameter probabilities, offering accuracy comparable to existing methods with the added benefit of directly assessing uncertainties. Although the paper provides a solid methodological explanation, it lacks a thorough comparison with other inference methods. Nevertheless, it presents a valuable advancement for neuroscientists interested in new approaches for parameter estimation from calcium imaging data.

eLife assessment

This study explores the role of one the most abundant circRNAs, circHIPK3, in bladder cancer cells, providing convincing data that circHIPK3 depletion affects thousands of genes and that those downregulated (including STAT3) share an 11-mer motif with circHIPK3, corresponding to a binding site for IGF2BP2. The experiments demonstrate that circHIPK3 can compete with the downregulated mRNAs targets for IGF2BP2 binding and that IGF2BP2 depletion antagonizes the effect of circHIPK3 depletion by upregulating the genes containing the 11-mer motif. These valuable findings contribute to the growing recognition of the complexity of cancer signaling regulation and highlight the intricate interplay between circRNAs and protein-coding genes in tumorigenesis.

eLife assessment

This important study represents a follow-up of previous papers by Huff et al. (2023) in which the authors further investigate a specific medullary region named the Postinspiratory Complex (PiCo) involved in the control of swallow behaviour and its coordination with breathing. In the present work, they tested the impact of chronic intermittent hypoxia on the swallow motor pattern evoked by optogenetic stimulation of the same medullary area in transgenic mice. These solid results indicate that in chronic intermittent hypoxia-exposed mice PiCo stimulation triggers atypical swallow motor patterns. The experimental procedures are rigorous and technically remarkable. The work will be of interest in the field of respiratory physiology and pathophysiology since a disruption of swallowing and possibly discoordination with breathing may be involved in diseases characterized by the presence of hypoxic conditions such as obstructive sleep apnea.

eLife assessment

This valuable study examines the activity and function of dorsomedial striatal neurons in estimating time. The authors examine striatal activity as a function of time and the impact of optogenetic striatal manipulation on the animal's ability to estimate a time interval. However, the task's design and methodology present several confounding factors that mean the evidence in support of the authors' claims is incomplete. With these limitations addressed, the work would be of interest to neuroscientists examining how striatum contributes to behavior.

eLife assessment

This valuable study describes early postnatal compartmental differences in the functional maturation of striatal projection neurons. It explores how the postnatal activity of these neurons may determine the GABAergic innervation of dopaminergic neurons in the adult substantia nigra pars compacta. While the functional characterization of striatal neuron development is solid, analysis of how early postnatal activity of striatal projection neurons shapes their functional innervation of dopaminergic neurons is incomplete.

eLife assessment

This study presents a valuable finding on the structural role of glycosylation at position N343 of the SARS-CoV-2 spike protein's receptor-binding domain in maintaining its stability, with implications across different variants of concern. The evidence supporting the claims of the authors is solid, although a more complete discussion of published data would have strengthened the study by providing a foundation for the new findings. The work will be of interest to evolutionary virologists.

eLife assessment

This study is a useful showcase of a workflow to perform large-scale characterization of drug mechanisms of action using proteomics. The work is backed by solid evidence, however, more statistical analyses and a user-friendly interface to enhance data mining by the readers are recommended. The strengths of this study include the large number of compounds tested within a common workflow and well-described experimental protocols. This will be of broad interest to medicinal chemists, toxicologists, and biochemists.

eLife assessment

This is a very strong, well-written, and interesting paper analyzing in an original way how tension pattern dynamics can reveal the contribution of active versus passive intercalation during tissue elongation. The authors apply a new concept of isogonal tension decomposition to extract a global map of tissue mechanics that will be extremely valuable in the field of biomechanics. The model is convincing to explain the authors' data but could be strengthened further by analyzing data from mutant backgrounds that could serve as a test.

eLife assessment

The study by Long et al. presents valuable findings on the role of the SUL1 gene in yeast longevity, proposing that lifespan extension can occur through signaling pathways independent of its sulfate transport function, offering new insights into aging mechanisms with potential implications beyond yeast biology. However, the evidence supporting the uncoupling of SUL1's transport and signaling functions is inadequate, relying on limited lifespan analysis without measurements for nutrients and nutrient signaling status. This research is of particular interest to the aging research community, although additional experiments are needed to fully substantiate the claims.

eLife assessment

This paper makes a valuable contribution by implicating S-acylation of Cys-130 in recruitment of the inflammasome receptor NLRP3 to the Golgi. Enzymes are identified as candidates for mediating S-acylation and de-acylation of NLRP3, and evidence is presented that S-acylation plays a role in response to the stress induced by nigericin treatment. Although it seems likely that Cys-130 does indeed contribute to membrane association of NLRP3, the mechanistic analyses are incomplete and the interpretations about the effects of nigericin are not fully conclusive.

eLife assessment

The authors introduce a valuable machine-learning model for predicting binding sites of diverse ligands, including DNA, RNA, peptides, proteins, ATP, HEM, and metal ions, on proteins. The method is freely accessible and user-friendly. The authors have conducted thorough benchmarking and ablation studies, providing convincing evidence of the model's overall performance, despite some imperfections of the comparisons to other methods that arise from intrinsic differences between training methods and data.

eLife assessment

This study presents a rather valuable finding that vilazodone can restore the normal platelet level through regulating 5-HT1A receptor. The evidence supporting the claims of the authors is solid, although inclusion of more cell lines and more detailed analysis of the results would have strengthened the study. The work will be of interest to scientists working in the field of thrombocytopenia.

eLife assessment

This important study unveils the significant impact of prenatal alcohol exposure on epigenetic patterns, offering new insights into its adverse health outcomes through solid evidence from both mouse models and human data. The findings, which reveal how a high-methyl diet can mitigate these epigenetic alterations, present a promising prenatal care strategy. Despite its solid data overall, the study's small sample size and unaccounted confounders suggest the need for further research to confirm these findings and explore their practical implications.

eLife assessment

The study presented in this manuscript makes important contributions to our understanding of cell fate decisions and the role of noise in gene regulatory networks. Through computational and theoretical analysis, the authors provide solid support for distinguishing distinct driving forces behind fate decisions based on noise profiles and reprogramming trajectories. While acknowledging the potential limitations of small gene regulatory networks in capturing the richness of whole-transcriptome sequencing datasets, this study offers a creative approach for formulating hypotheses about gene regulation during stem cell differentiation using single-cell sequencing data.

eLife assessment

This work presents some valuable information regarding the molecular mechanisms controlling the regeneration of pancreatic beta cells following induced cell ablation. However, the study lacks the critical lineage tracing result to support the conclusion about the origin of the regenerated beta cells. The results of the pharmacological manipulation of CaN signaling are also incomplete. In particular, these manipulation are not cell-specific, making it difficult to interpret and thus a genetic approach is recommended.

eLife assessment

This potentially useful work characterizes the changes in microbial composition of the nasal and fecal microbiomes of COVID-19 patients according to the severity of disease. However, the description of methods and statistics used for several figures is incomplete.

eLife assessment

This comprehensive study provides valuable information on the cooperation of Ikaros with Foxp3 to establish and regulate a major portion of the epigenome and transcriptome of T-regulatory cells. While the data are compelling, the evidence that these features are solely intrinsic, independent of the micro-environment, could be strengthened.

eLife assessment

The development of this mouse model is an important step to establish the role of the FSH Receptor in tissues beyond the reproductive system, and the data provided in this paper are convincing for a role for the FSH receptor in cell systems well beyond the classic reproductive tissues. Such model(s) have long been needed in this field and will provide expanded opportunities to better define FSH biology in vivo in these important target tissues. Ultimately, this model could shed light on FSH biology in women after menopause, when endogenous FSH levels rise dramatically, or in men with hypogonadism when FSH levels are high.

eLife assessment

This study on scRNA-seq of allergic contact dermatitis (ACD) is important in that it presents new data on fibroblasts in ACD and links to recent studies on other cell types and their signatures. The evidence presented is solid in that the data support claims of unique roles for subtypes of fibroblasts in ACD. Overall, this paper will be used as a resource by many in the skin inflammation field.

eLife assessment

This valuable work provides a near-complete description of the mechanosensory bristles on the Drosophila melanogaster head and the anatomy and projection patterns of the bristle mechanosensory neurons that innervate them. The data presented are solid. The study has generated numerous resources for the community that will be of interest to neuroscientists in the field of circuits and behaviour, particularly those interested in mechanosensation and behavioural sequence generation.

eLife assessment

This important study outlines how the agr quorum sensing system in Staphylococcus aureus confers long-lived protection against oxidative stress, thereby linking bacterial metabolism to virulence in this pathogen. While the findings, which are supported by solid data, seem at first glance to contradict earlier findings that show increased fitness of agr mutants under oxidative stress, the core conclusions of the study are well-substantiated. The topic of the paper holds broad relevance to microbiologists, especially those focusing on host-pathogen interactions and bacterial responses to ROS.

eLife assessment

This fundamental study substantially advances our understanding of sibling chimerism in marmosets by demonstrating that chimerism is limited to hematopoietic cells. The evidence supporting these findings is compelling, demonstrated through comprehensive analyses, including single-cell RNA-seq data from multiple individuals and tissues. The work will be of broad interest to many fields of biology.

eLife assessment

This important study uses citizen science-generated diversity records and quantitative methodologies to improve species distribution estimates. This combination of fields, technologies, and methodologies is solid and improves species distribution maps formerly based solely on limited data gathered by scientists in traditional ways/surveys. This paper will be of interest to researchers interested in citizen science and new sources of big data in biodiversity, and to biogeographers exploring the distributions of species on the planet.

eLife assessment

This study provides important findings on the modulation of cortical neuronal responses to sensory stimuli by motor-driven predictive signals. The study is methodologically sound and well-designed. The data, as analysed, provide incomplete support for the conclusion that audiomotor mismatch responses are observed in the auditory cortex and that these are strongly modulated by cross-modal signals.

eLife assessment

This important study combines fMRI and electrophysiology in sedated and awake rats to show that LFPs strongly explain spatial correlations in resting-state fMRI but only weakly explain temporal variability. They propose that other, electrophysiology-invisible mechanisms contribute to the fMRI signal. The evidence supporting the separation of spatial and temporal correlations is convincing, however, the support of electrophysiological-invisible mechanisms is incomplete, considering alternative potential factors that could account for the differences in spatial and temporal correlation that were observed. This work will be of interest to researchers who study the mechanisms behind resting-state fMRI.

eLife assessment

The paper reports rare compound heterozygous deletion variants that affect the kinase domains of non-receptor tyrosine kinases TNK and ACK1 in families with human systemic lupus erythematosus (SLE). Using a mouse experimental model and human induced pluripotent stem cell (hiPSC)-derived macrophages, the study provides solid evidence that clarifies cause-effect relationships and that suggests a potential cellular mechanism underlying the resultant nephritis. With the identification of novel SLE-related genes, this manuscript provides an important basis for understanding the molecular and cellular basis of SLE pathogenesis.

eLife assessment

This study demonstrates mRNA-specific regulation of translation by subunits of the eukaryotic initiation factor complex 3 (eIF3) using convincing methods, data, and analyses. The investigations have generated important information that will be of interest to biologists studying translation regulation. However, the physiological significance of the gene expression changes that were observed is not clear.

eLife assessment:

In flies defective for axonal transport of mitochondria, the authors report the upregulation of one subunit, the beta subunit, of the heterotrimeric eIF2 complex via mass spectroscopy proteome analysis. Neuronal overexpression of eIF2β phenocopied aspects of neuronal dysfunction observed when axonal transport of mitochondria was compromised. Conversely, lowering eIF2β expression suppressed aspects of neuronal dysfunction. While these are intriguing observations that are potentially useful, several technical weaknesses limit the interpretation and mean the evidence supporting the current claims is incomplete.

eLife assessment

This important study combines a range of biophysical techniques to carry out a series of compelling experiments to explore whether glutamine binding protein binds glutamine via an induced fit or a conformational selection process. The evidence supporting the major conclusion of the work is convincing, although it may not be generalized to other protein-ligand or protein-protein systems. The work will be of broad interest to biochemists and biophysicists.

eLife assessment

The demonstration that the PARG dePARylation enzyme is required in S phase to remove polyADP-ribose (PAR) protein adducts that are generated in response to the presence of unligated Okazaki fragments is potentially valuable, but the evidence is incomplete, and identification of relevant PARylated PARG substrates in S-phase is needed to understand the role of PARP1-mediated PARylation and PARG-catalyzed dePARylation in S-phase progression.

eLife assessment

This paper provides a useful analysis of the variation of the burden of strokes across geographic regions, finding differences in the relationship between strokes and their comorbidities. This dataset and the correlations found within will be a resource for directing the focus of future investigations. The statistical analyses are incomplete.

eLife assessment

This study provides valuable information on how Arg-II participates in cardiac aging. Although the phenotypic data appear robust, the study is incomplete in elucidating the mechanisms, particularly in explaining how Arg II influences IL-1b and affects cardiac aging. It would be beneficial to investigate the possibility of NO involvement in this mice model. A co-culture system may be required to understand the non-cell-autonomous functions of macrophages. Lastly, the MI mouse model may not be directly linked to cardiac aging.

eLife assessment

This useful paper looks for correlations between immunophenotypic markers and several measures of HIV reservoir volume in cross-sectional cohorts of people living with HIV on ART using several bioinformatic and machine-learning tools. The level of evidence linking these variables is incomplete given possible confounding variables, lack of directionality & effect size, and mechanistic basis.

eLife assessment

This paper reports a valuable platform for cardiac tissue cultivation. The throughput, consistency of the tissue, and the potential integration of high-throughput automation are an advantage over other approaches. The tissues and the platform are validated using appropriate methodology to provide convincing evidence of the tissue cultivation capability.

eLife assessment

This fundamental study provides evidence that de novo beige adipogenesis from Pdgfra+ adipocyte progenitor cells is blocked during early aging in subcutaneous fat. The depth of the data at early ages is compelling, with rigorous cell tracing methodology employed. The study will aid in identifying new approaches to switch dormant adipocytes into an active thermogenic phenotype, and should be of interest to cell biologists at large.

eLife assessment

This study includes fundamental findings on protein evolution, namely that changes in function are largely attributable to pairwise rather than higher-order interactions, and that epistasis potentiates rather than constrains evolutionary paths. Compelling evidence supporting the conclusions is provided by applying a new model to a previously generated experimental dataset on deep mutational scanning of the DNA-binding domain (DBD) of steroid hormone receptor. The implications of this work are of considerable interest to protein biochemistry, evolutionary biology, and numerous other fields.

eLife assessment

This study presents fundamental findings on the evolution of extremely elongated mandibular symphysis and tusks in longirostrine gomphotheres from the Early and Middle Miocene of northern China. The integration of multiple methods provides compelling results in the eco-morphology, behavioral ecology, and co-evolutionary biology of these taxa. In doing so, the authors elucidate the diversification of fossil proboscideans and their likely evolutionary responses to late Cenozoic global climatic changes.

eLife assessment

This important study advances our understanding of the biological significance of the DNA sequence adjacent to telomeres. The data presented convincingly demonstrate that subtelomeric repeats are non-essential and have a minimal, if any, role in maintaining telomere integrity of budding yeast. The work will be of interest to the telomere community specifically and the genome integrity community more broadly.

eLife assessment

In this study, the authors offer a theoretical explanation for the emergence of nematic bundles in the actin cortex, carrying implications for the assembly of actomyosin stress fibers. As such, the study is a valuable contribution to the field actomyosin organization in the actin cortex. While the theoretical work is solid, experimental evidence in support of the model assumptions remains incomplete. The presentation could be improved to enhance accessibility for readers without a strong background in hydrodynamic and nematic theories.

eLife assessment

This valuable study describes mRNA shortening during cellular stress and interestingly observes that this shortening is dependent on localization in stress granules. Surprisingly, this mRNA shortening does not appear to require the shortening of polyA tails. These are in principle novel findings, but the evidence for them is currently incomplete. Additional experiments would help bolster confidence in how the authors interpret their data.

eLife assessment

This is an important study on the regulation of chlorophyll biosynthesis in rice embryos. It provides insights into the genetic and molecular interactions that underlie chlorophyll accumulation, highlighting the inhibition of OsGLK1 by OsNF-YB7 and the broader implications for understanding chloroplast development and seed maturation in angiosperms. The results presented, including mutation analysis, gene expression profiles, and protein interaction studies, provide convincing evidence for the function of OsNF-YB7 as a repressor in the chlorophyll biosynthesis pathway.

eLife assessment

The authors report useful findings on novel function of apical ICAM1 in regulating bile duct homeostasis in the liver. The strength of evidence is solid using appropriate methodolgy with only minor weakness. The findings will be of interest to researchers in hepatology and membrane traffic biology.

eLife assessment

This important study identifies the mitotic localization mechanism for Aurora B and INCENP (parts of the chromosomal passenger complex, CPC) in Trypanosoma brucei. The mechanism differs from that in the more commonly studied opisthokonts and is supported by compelling RNAi and imaging experiments, targeted mutations, immunoprecipitations with crosslinking/mass spec, and AlphaFold interaction predictions. The findings will be of interest to cell biologists working on cell division, parasitologists, and those interested in the evolution of mitotic mechanisms.

eLife assessment

This valuable paper presents a new approach for association testing, using the output of neural networks that have been trained to predict functional changes from DNA sequences. As such, the approach is an interesting addition to statistical genetics, and the evidence for the presented method being able to identify trait-associations in regions where GWASs are typically underpowered is solid. A limitation is, however, that it is unclear how the quality of these associations compares to those detected using conventional methods. Additional work assessing this method's power and characterizing false positives / false negative regions would be critical to ensure that the method is broadly adopted by the field.

eLife assessment

Using state-of-the-art single-nucleus RNA sequencing, Yao et al. investigate the transcriptomic features of neural stem cells (NSCs) in the human hippocampus to address how they vary across different age groups and stroke conditions. The authors report alterations in NSC subtype proportions and gene expression profiles after stroke. Although the study is valuable and the analysis is comprehensive, the significance is restricted by well-acknowledged technical limitations leading to incomplete evidence supporting some main conclusions.

eLife assessment

This manuscript supports the intriguing idea that some aspects of novel learning can occur during sleep and outside of awareness. The authors provide solid evidence that presenting participants with novel words and their translations during sleep, especially during slow oscillation troughs, leads to the ability to categorize the semantic meaning of those words during awake testing 36 hours later. These findings represent a valuable contribution to the literature on unconscious processing and learning during sleep, although the claim that the results reflect episodic memory formation, in particular, deviates from the typical use of this term in the literature.

eLife assessment

This important work illuminates the dynamics of BRAF in both its monomeric and dimeric forms, with or without inhibitors, combining traditional techniques and sophisticated computational analyses. The evidence presented is convincing, though a more detailed description of the analyses could enhance reproducibility and the quality of the results. This study will interest structural biologists, medicinal chemists, and pharmacologists.

eLife assessment

This important paper compares cross-species cortical folding patterns in human and non-human primates, showing that most gyral peaks shared across species are in lower-order cortical regions. The supporting evidence is solid and multi-faceted, encompassing anatomy, connectivity and gene expression. This paper will be of interest to a broad readership within the neuroscience community, especially for those interested in cross-species correspondences in brain organisation.

eLife assessment

This study by Ghafari et al. tackles a question relevant for the field of attention as it connects structural differences in subcortical regions with oscillatory modulations during attention allocation. Using a combination of Magnetoencephalography (MEG) and magnetic resonance imaging (MRI) data in human subjects, the valuable results show that inter-individual differences in the lateralisation of alpha oscillations are explained by asymmetry of subcortical brain regions. The strength of evidence is deemed convincing in line with current state-of-the-art.

eLife assessment

Parkkinen et al. describe distinct biophysical profiles of brain-derived alpha-synuclein vs. in vitro-seeded synuclein fibrils. The findings are important and relevant to the emerging potential role of SAA as a biomarker of PD. The evidence is solid, using appropriate methodology and providing some support for the main claims with some limitations.

eLife assessment

Songbirds provide a tractable model system to study mechanisms of vocal production and sequencing, and past work showed that the lesions to LMAN, the output of a basal ganglia thalamocortical loop, reduced vocal variability, consistent with a role in motor exploration. In this fundamental work, the authors rigorously examined how lesions to an understudied neighboring region, MMAN, part of a parallel basal ganglia loop, affect singing in Bengalese finches, whose songs exhibit complex sequential transitions. The authors provide compelling evidence that MMAN lesions resulted in increased sequential variability but do not affect syllable acoustic structure, showing that distinct frontal systems can have distinct functions for producing and sequencing song syllables.

eLife assessment

These ingenious and thoughtful studies present important findings concerning how people can represent and generalise abstract patterns of sensory data. The issue of generalization is a core topic in neuroscience and psychology, relevant across a wide range of areas, and the findings will be of interest to researchers across areas in perception, learning and cognitive science. The findings are convincing in this setting, but future research must establish their generality and interrogate the precise nature of the underlying mechanism.

eLife assessment

The authors provide convincing experimental evidence of extended motivational signals encoded in the mouse anterior cingulate cortex (ACC) that are implemented by the orbitofrontal cortex (OFC)-to-ACC signaling during learning. The results are valuable to the field of motivation and cognition. The experimental methods used were state-of-the-art. The manuscript would further benefit from theory-driven analyses to inform a mechanistic understanding, particularly for the single-cell calcium imaging results. These results will be of interest to those interested in cortical function, learning, and/or motivation.

eLife assessment

This study presents important methodologies for repeated brain ultrasound localization microscopy (ULM) in awake mice and a set of results indicating that wakefulness reduces vascularity and blood flow velocity. The efficiency of the technique is however incompletely demonstrated, in particular regarding the reliability of longitudinal imaging. This study is relevant for scientists investigating vascular physiology in the brain.

eLife assessment

This valuable manuscript shows that the optogenetic stimulation of direct and indirect pathway spiny projection neurons (SPNs) in the dorsomedial versus the dorsolateral striatum has different consequences for locomotor activity, real-time place preference, and action selection, in a contextually mediated manner. The evidence in support of this conclusion is solid but would be further strengthened through deeper analysis of the effect and specificity of optogenetic manipulations on SPN activity. These findings will be of interest to neuroscientists, particularly behavioral neuroscientists.

eLife assessment

The authors of this study implemented an important toolset for 3D reconstruction and segmentation of dissection photographs, which could serve as an alternative for cadaveric and ex vivo MRIs. The tools were tested on synthetic and real data with compelling performance. This toolset could further contribute to the study of neuroimaging-neuropathological correlations.

eLife assessment

This paper investigates how the EWS::FLI1 fusion protein organizes chromatin topology and regulates gene expression in an aggressive pediatric bone cancer known as Ewing sarcoma. The authors used the most recent genomics methodologies to provide a solid base of evidence for the role of a short alpha helix in the DNA binding domain of FLI1 in modulating binding to GGAA microsatellites and promoting enhancer activity. The study provides valuable insight into the underlying oncogenic mechanisms in Ewing sarcoma, but is limited to a single cell line and would benefit from consolidation of the main conclusions using additional techniques.

eLife assessment

This important manuscript details the characterization of ClpL from L. monocytogenes as an effective and autonomous AAA+ disaggregase that provides enhanced heat resistance to this food-borne pathogen. Supported by compelling evidence, the authors demonstrate that ClpL has DnaK-independent disaggregase activity towards a variety of aggregated model substrates, which is more potent than that observed with the endogenous canonical DnaK/ClpB bi-chaperone system. The work will be of broad interest to microbiologists and biochemists.

eLife assessment

This study aims to explore the diabetes-bone paradox using the Mendelian Randomization approach. That diabetes itself is not the direct cause, but rather the complications or associated risk factors increase the risk of fracture, constitutes a valuable insight. Mendelian randomization to explain the relationship of two complex conditions is solid and conducted properly; however, the efforts to reconcile the discrepancies between the Mendelian Randomization analysis and observational studies are incomplete.

eLife assessment

This is an important paper as it is the first to use a reconstituted translation system to study competition among mRNAs for the initiation machinery. Understanding the principles of the biochemistry of mRNA competition for initiation factors cannot be achieved without such a system. The authors provide compelling evidence that Ded1 is required for efficient initiation of highly structured mRNAs. The findings are significant and validate the in vitro reconstituted system by recapitulating the effects of in-vivo perturbations of translation initiation by Ded1 mutants.

eLife assessment

This fundamental study advances our understanding of the cell specific treatment of cone photoreceptor degeneration by Txnip. The evidence supporting the conclusions is compelling with rigorous genetic manipulation of Txnip mutations. The work will be of broad interest to vision researchers, cell biologists and biochemists.

eLife assessment

This valuable study on the molecular and cellular mechanisms of ingestion avoidance of high salt in insects is focused in scope, but the authors present convincing evidence that a specific subset of gustatory receptors in a pair of pharyngeal taste neurons are necessary and sufficient for avoiding ingestion of high salt during feeding. This work will be of interest to Drosophila neuroscientists interested in taste coding and feeding behavior.

eLife assessment

This valuable paper provides convincing evidence that loss of the tumor suppressor TMEM127 causes disorganization of plasma membrane lipid domains, alters clathrin assembly, and inhibits endocytosis of a variety of cell surface receptors, leading to increased cell surface levels of signaling proteins including RET and other transmembrane receptor tyrosine kinases. The results are significant for understanding how RET127 loss contributes to pheochromocytoma, although the evidence is indirect owing to the lack of human pheochromocytoma cell lines. The results will be of interest for researchers studying pheochromocytoma and endocytosis mechanisms.

eLife assessment

This fundamental study advances our understanding of how Notch signaling activates transcription by analyzing dynamics of the Mastermind transcriptional co-activator and its role in the activation complex. The evidence is compelling and based on state of the art methods with precise quantitative measurements.

eLife assessment

This useful study describes expression profiling by scRNA-seq of thousands of cells of recombinant yeast genotypes from a system that models natural genetic variation. The rigorous new method presented here holds promise for improving the efficiency of genotype-to-phenotype mapping in yeast, providing convincing evidence for its efficacy. This manuscript focuses on overcoming technical challenges with this approach. It currently offers somewhat limited new biological insights to place the work within the broader context of the field. Doing so would broaden the interest of the work for all geneticists and evolutionary biologists.

eLife assessment

This important study presents a new quantitative imaging pipeline that describes with high temporal precision and throughput the movements of late-stage Drosophila embryos, a critical moment when motion first appears. A new approach is used to explore the role of miRNAs in motion onset and presents solid evidence that shows a role for miR-2b-1 and its target Janus in embryonic motion. The data are well supported but do not provide mechanistic insight into the emergence of movement while the writing inflates the importance of the conclusions. The authors must change the name of Janus which is already used in Drosophila genetics.

eLife assessment

This study presents valuable findings on two distinct modes of endosomal fusion and the roles of actin dynamics in this process. The evidence supporting the authors' claims is solid, although the underlying molecular mechanisms and whether the proposed fusion modes are applicable in other cell types remain unclear. The work will be of interest to cell biologists and biophysicists working on the cytoskeleton and organelles.

eLife assessment

This important study addresses the mechanisms by which mutations in the PURA protein, a regulator of gene transcription and mRNA transport and translation, cause the neurodevelopmental PURA syndrome. Based on convincing evidence from structural biology, molecular dynamics simulation, biochemical, and cell biological analyses, the authors show that the PURA structure is very dynamic, rendering it generally sensitive to structure-altering mutations that affect its folding, DNA-unwinding activity, RNA binding, dimerization, and partitioning into processing bodies. These findings are of substantial importance to cell biology, neurogenetics, and neurology alike, because they provide first insights into how very diverse PURA mutations can cause similar and penetrant molecular, cellular, and clinical defects.

eLife assessment

This study by Sheng and colleagues provides valuable insights into the mechanism of competitive inhibitors of P2X receptors. The structural and functional evidence supporting the subtype specificity of pyridoxal-5'-phosphate derivatives is compelling and provides information for designing drugs that selectively target different subtypes of P2X receptor channels. The work will be of interest to biochemists, structural biologists, and pharmacologists.

eLife assessment

This important study used Voltage Sensitive Dye Imaging (VSDI) to measure neural activity in the primary visual cortex of monkeys trained to detect an oriented grating target that was presented either alone or against an oriented mask. The authors show convincingly that the initial effect of the mask ran counter to the behavioral effects of the mask, a pattern that reversed in the latter phase of the response. They interpret these results in terms of influences from the receptive field center, and although an alternative view that emphasizes the role of the receptive field surround also seems reasonable, this study stands as an interesting contribution to our understanding of mechanisms of visual perception.

eLife assessment

In this manuscript, the authors investigate the properties of prokaryotic NADPH oxidases (NOX) and discuss the implications for NOX regulation and function. The structure of the S. pneumoniae Nox protein is an important step forward in our understanding of procaryotic NOX enzymes and the characterization and interpretation are convincing. The results will be of interest to structural biologists as well as biochemists focusing on enzymatic functions.

eLife assessment

This important study identifies the gene mamo as a new regulator of pigmentation in the silkworm Bombyx mori, a function that was previously unsuspected based on extensive work on Drosophila where the mamo gene is involved in gamete production. The evidence supporting the role of Bm-nano in pigmentation is convincing, including high-resolution linkage mapping of two mutant strains, expression profiling, and reproduction of the mutant phenotypes with state-of-the-art RNAi and CRISPR knock-out assays. The work will be of interest to evolutionary biologists and geneticists studying color patterns and evolution of gene networks.

Editors Assessment:

MPDSCOVID-19 has been developed as a one-stop solution for drug discovery research for COVID-19, running on the Molecular Property Diagnostic Suite (MPDS) platform. This is built upon the open-source Galaxy workflow system, integrating many modules and data specific to COVID-19. Data integrated includes SARS-CoV-2 targets, genes and their pathway information; information on repurposed drugs against various targets of SARS-CoV-2, mutational variants, polypharmacology for COVID-19, drug-drug interaction information, Protein-Protein Interaction (PPI), host protein information, epidemiology, and inhibitors databases. After improvements to the technical description of the platform, testing helped demonstrate the potential to drive open-source computational drug discovery with the platform.

This evaluation refers to version 1 of the preprint

Editors Assessment:

This Data Release paper presents an updated genome assembly of the doubled haploid perennial ryegrass (Lolium perenne L.) genotype Kyuss (Kyuss v2.0). To correct for structural the authors de novo assembled the genome again with ONT long-reads and generated 50-fold coverage high-throughput chromosome conformation capture (Hi-C) data to assist pseudo-chromosome construction. After being asked for some more improvements to gene and repeat annotation the authors now demonstrate the new assembly is more contiguous, more complete, and more accurate than Kyuss v1.0 and shows the correct pseudo-chromosome structure. This more accurate data have great potential for downstream genomic applications, such as read mapping, variant calling, genome-wide association studies, comparative genomics, and evolutionary biology. These future analyses being able to benefit forage and turf grass research and breeding.

This evaluation refers to version 1 of the preprint

eLife assessment

This valuable study addresses the role of Rho-associated coiled-coil kinase (ROCK) and the cytoskeleton in the initiation and growth of the calcified endoskeleton of sea urchin embryos. Perturbation by two independent approaches (a morpholino and a selective inhibitor) provides convincing evidence that ROCK participates both in actomyosin regulation and in the gene regulatory network that controls skeletogenesis. Exciting areas of future work will be to elucidate the mechanisms by which ROCK influences gene expression and to further dissect the role of the cytoskeleton in mineralization.

eLife assessment

This useful work provides insight into agonist binding to nicotinic acetylcholine receptors, which is the stimulus for channel activation that regulates muscle contraction at the neuromuscular junction. The authors use in silico methods to explore the transient conformational change from a low to high affinity agonist-bound conformation as occurs during channel opening, but for which structural information is lacking owing to its transient nature. The evidence supporting the main conclusion that ligands flip ~180 degrees in the binding site as it transitions from a low to high affinity bound conformation is incomplete because little support is available for the starting low affinity docked conformations, and the rather approximate methods for computing binding free energies differ significantly from experimental measures for two of the four tested ligands. Nonetheless, this work presents an intriguing possibility for the nature of a transient conformational change at the agonist binding site correlated with channel opening. If the ligand flip observed in these simulations can be reproduced or verified by other studies, then this work would stand as a significant advance in our knowledge of nicotinic receptor gating.

eLife assessment

The manuscript reports on an important comparison of a range of approved clinical inhibitors for BTK used for the treatment of chronic lymphocytic leukemia (CLL). The authors provide solid evidence for their claims, using a combination of HDX-MS and NMR spectroscopy. The novelty is that this study also seeks to evaluate resistance mutation bias. The scope of the study is highly exciting but would benefit from a clear link of the biophysical studies to the functional assays - specifically nucleotide binding.

eLife assessment

In this interesting study, Drożdżyk and colleagues analyze the ability of placental CALHM orthologs to form stable complexes, identifying that CALHM2 and CALHM4 form heterooligomeric channels. The authors then determine cryo-EM structures of heterooligomeric CALHM2 and CALHM4 that reveal a distinct arrangement in which the two orthologs can interact, but preferentially segregate in the channel. This is an important study; the data provide compelling support for the interpretations and overall, the work is clearly described.

eLife assessment

In this important study, the authors report a novel measurement of the Escherichia coli chemotactic response and demonstrate that these bacteria display an attractant response to potassium, which is connected to intracellular pH level. Whilst the experiments are mostly convincing, there are some confounders regards pH changes and fluorescent proteins that remain to be addressed.

eLife assessment

This important study describes how PhoP regulates cyclic-AMP production in the human pathogen Mycobacterium tuberculosis. The authors provide convincing evidence that PhoP acts as a repressor of the cyclic-AMP-specific phosphodiesterase, Rv0805, which can degrade cyclic-AMP. The work will be of interest to bacteriologists and whilst the revised manuscript has been substantively improved, there are some outstanding points that could improve clarity and presentation.

eLife assessment

Morphological characteristics and phenotypes of mutations in key developmental genes suggest that head, trunk, and tail development are regulated by discernible modules. Gdf11 signalling plays a crucial role in orchestrating the transition from trunk to tail tissues in vertebrate embryos. This important study presents convincing evidence that Tgfbr1 acts upstream of Isl1 (a pivotal effector of Gdf11 signalling) and regulates blood vessels, the lateral plate mesoderm, and the endoderm associated with the trunk-to-tail transition. Together with the previous studies, this work identifies a key signal that acts as the pivot of the trunk-to-tail transition.

eLife assessment

This study presents a valuable finding and developed ME3BP-7 as a novel microencapsulated form of 3BP targeting MCT1 overexpressing PDAC cells, demonstrating its specificity and efficacy in vitro and in PDAC mouse models with significant anti-tumor effects and improved serum stability. The evidence supporting the claims of the authors is solid; however, the study calls for additional comparative in vivo data to enhance its translational significance.

eLife assessment

This is an important study on the biochemical and biophysical analysis of a transcriptional riboswitch, detailing how Mg2+ and guanidine regulate RNA conformations. The study provides compelling evidence, developing Position-specific labeling of RNA (PLOR) and single-molecule FRET (smFRET) microscopy that are well suited to investigate the conformational dynamics of RNA structure formation. The study would have been strengthened by using a bacterial instead of phage protein to better recapitulate the physiology of the process. The work is of broad interest to those interested in RNA functional architecture and regulation.

eLife assessment

This is an important study that demonstrates that RNA intermediates arising from improper splicing are exported out of the nucleus via the canonical mRNA export machinery and the nuclear pore basket. The authors provide convincing evidence that the role of the nuclear basket rather than retaining the transcripts is stimulating their export, putting into question the current model of the role of the basket. The conclusions are in line with recent studies in mammalian cells that suggest that the basket's role in mRNA export and quality control has to be revised.

eLife assessment

The formation of the Z-ring at the time of bacterial cell division interests researchers working towards understanding cell division across all domains of life. The manuscript by Jasnin et al reports the cryoET structure of toroid assembly formation of FtsZ filaments driven by ZapD as the cross linker. The findings are important and have the potential to open a new dimension in the field, but the evidence to support these exciting claims is currently inadequate.

eLife assessment

The Hippo signaling pathway plays a crucial role in controlling organ size, cell proliferation, and apoptosis, though its role in endocrine pancreas development has remained unclear. In this useful work, the authors study the function of the Tead1 transcription factor, a Hippo effector, specifically in pancreatic beta cells. They provide solid evidence, using multiple different conditional knockout models to reveal Tead1's regulatory functions in insulin secretion and beta cell proliferation. However, deeper exploration of their data and incorporating findings from existing literature on this topic would provide a clearer understanding of Tead1's role in β-cell function, within or beyond the Hippo pathway.

eLife assessment

The main finding in this paper is that EGFR can be a novel substrate of the membrane ZNRF3/RNF43 E3 ligases. This is significant as the prevailing understanding posits that the Wnt receptors Frizzled and LRP5/6 exclusively served as substrates for these ligases. Given the frequent occurrence of mutations in ZNRF3/RNF43 or compromised expression levels in human cancers, the new evidence that aberrant EGFR expression and signaling may also contribute to the tumorigenic effects of ZNRF3/RNF43 mutations in cancer is important. The conclusions of the manuscript are supported by solid data, but some aspects of the mechanism presented need to be reinforced to fully support the claims made by the authors.

eLife assessment

This compelling study reports the to-date most comprehensive neurotransmitter atlas of any organism, using fluorescent knock-in reporter lines. It represents an extremely useful tool for a broad audience of scientists interested in neuronal cell type differentiation and function.

eLife assessment

Dong et al. investigate the role of the small Ras-like GTPase Rab10 in the exocytosis of DCVs in mouse hippocampal neurons, showing that Rab10 depletion hinders DCV exocytosis independently of its effects on neurite outgrowth. Their findings are convincing and provide evidence that Rab10 depletion leads to altered ER morphology, impaired ER-based calcium buffering, and decreased ribosomal protein expression, which collectively contributes to defective DCV secretion. The study comes to the important conclusion that Rab10 is critical for DCV release by ensuring ER calcium homeostasis.

eLife assessment

Overall, the reviewers found the significance of the work valuable to the field of visual neuroscience, particularly given the large data set and strength of the method used that allowed for spatial analysis of neuronal responses in macaque V1. The evidence was deemed compelling, owing in part to the consistency of responses across animals and the fitness of modeling. The authors have addressed the major comments from reviewers and improved the manuscript through relation to prior literature and addressing specific limitations of the method used.

eLife assessment

Sisigano et al. report findings about the role of sphingolipids using lipidomics with machine learning in paclitaxel-induced peripheral neuropathy and preliminary translation of the impact of SA1P in cultured neuronal cells. This study presents a valuable finding on the increased activity of two well-studied signal transduction pathways in a subtype of breast cancer. The strength of evidence is incomplete with some support for the main claims with some limitations.

eLife assessment

This study presents important insights into the dynamical process whereby sensory information is converted from stimulus-driven activity to a working memory representation from which the information can be recalled later. The evidence supporting the claims is convincing, using detailed fits and model-comparison techniques applied to new and existing psychophysical data sets to evaluate a wide variety of potential mechanisms. The overall conclusion, that iconic memory and working memory are not distinct mechanisms but rather two slightly different regimes of the same circuitry, will be of interest to neuroscientists and psychologists studying sensory systems and/or working memory.

eLife assessment

This valuable study has practical implications for understanding rhythm perception and production in human cognition. The evidence for individual frequency preferences and a deterioration in frequency adaptation with age is solid. These findings may inform existing models of rhythm perception and production, and the reported effects of age may have clinical implications.

eLife assessment

This manuscript represents a cleanly designed experiment for assessing biological motion processing in children (mean age = 9) with and without ADHD. The group differences concerning accuracy in global and local motion processing abilities are solid, but the analyses suggesting dissociable relationships between global and local processing and social skills, age, and IQ are inconclusive. The results are useful in terms of understanding ADHD and the ontogenesis of different components of the processing of biological motion.

eLife assessment

This important modeling work demonstrates out-of-distribution generalization using a grid cell coding scheme combined with an attentional mechanism that operates over these representations (Determinantal Point Process Attention). The simulations provide compelling evidence that the model can improve generalization performance for analogies, addition, and multiplication. The paper is significant in demonstrating how neural grid codes can support human-like generalization capabilities in analogy and arithmetic tasks, which has been a challenge for prior models.

eLife assessment

This study provides solid evidence for differences in habit-learning in obsessive-compulsive disorder versus controls. Contrary to previous studies that employed a single laboratory session to study habit-learning, here a smartphone app delivered motor-sequence tasks daily for a month. These results have important implications for our understanding of goal-directed versus habit learning in obsessive-compulsive disorder.

eLife assessment

In this work, Huerlimann and colleagues suggest an intertalk between the thyroid and corticosteroid axis in regulating grouper metamorphosis. The work provides valuable genomic resources to address the endocrine control of a life cycle transition in the Malabar grouper fish. The evidence is still incomplete and it does not fully support an interaction between the thyroid and corticosteroid axis.

eLife assessment

This important study details the development of brain functional connectivity in a longitudinal cohort of Gambian children assessed outside a lab setup with functional near-infrared spectroscopy (fNIRS) from age 5 to 24 months, in relation to early physical growth and cognitive flexibility capacities at 4-5 years of age. Although the evidence supporting some conclusions is solid, the relevance of the results would be improved by defining clearer hypotheses regarding the developmental changes expected for the different connections, and by discussing the unexpected findings on early negative connectivity and connectivity decreases. Considering more advanced analytical approaches would allow the authors to deal with longitudinal data and integrate mediation links, even if the study might be underpowered to link adverse conditions such as undernutrition and later cognitive development. This study will be of interest to neuroscientists, psychologists, and neuroimaging researchers working on infant development in relation to environmental factors.

eLife assessment

This important study combined fMRI, TMS and computational modelling of behaviour to investigate the functional role of the left superior frontal sulcus (SFS) in both perceptual and value-based decisions. Based on sophisticated analyses, the results provide solid evidence that downregulating left SFS activity through TMS selectively alters perceptual decision accuracy but does not influence value-based decisions. The work will be of interest to cognitive neuroscientists investigating the neural correlates of decision-making and may have implications for computational psychiatry.

eLife assessment

This work provides a valuable characterization of neural activity in the anterior insular cortex during fear. The data were collected using behavior, single unit recording, and optogenetic control of neural activity. The study is a great starting point on the path to testing hypotheses about bidirectional control of behavior via segregated, anatomically defined output populations, since the authors recorded true neural activity, as opposed to bulk calcium flux, which is often used in this kind of experiment. However, the link between spiking, anatomy, and behavior is incomplete, and additional controls are necessary to support the claim for associative learning.

eLife assessment

This paper describes the structure and connectivity of brain neurons that send descending connections to motor neurons and muscle in the fruit fly nerve cord, using a synapse-resolution connectome. This valuable work provides a wealth of hypotheses and predictions for future experimentation and modelling. Using state-of-the-art methods, the authors provide solid evidence for their conclusions. Some conclusions however could be qualified to acknowledge currently unavoidable ambiguities associated with current methodologies.

eLife assessment

This important study reports the first results on the effects of subthreshold kilohertz sinusoidal transcranial magnetic stimulation (TMS) on the brain. Stimulation at fields of 2V/m and 3.5kHz enhances cortical motor excitability as measured by motor-evoked potentials elicited by single-pulse TMS. The evidence in support of this claim is compelling. This result is of importance to the field of non-invasive brain stimulation and to cognitive neuroscience as a whole.

eLife assessment

This study presents a valuable finding on a potential signaling pathway responsible for the direct effects of nicotine on intestinal stem cell growth and tumorigenesis. However, the evidence supporting the authors' claims remains incomplete. Additional analysis on how stem cells uniquely respond to nicotine could provide more definitive evidence and strengthen the study. This research will be of interest to medical biologists specializing in intestinal tumors.

eLife assessment

This valuable study advances our understanding of how leaf and soil microbes separately affect the performance of an invasive plant, Ageratina adenophora. The conclusions regarding the roles of litter microbes in regulating the A. adenophora population are currently supported only by incomplete evidence owing to limitations in experimental design and statistical analyses, as well as uncertainties associated with the presentation. The work will be of interest to invasion biologists.

eLife assessment:

This study reports compelling data supporting the role of beta-catenin on intercellular communication occurring via extracellular vesicles, with implications for immune evasion in hepatocellular carcinoma (HCC). This fundamental insight sheds light on the underlying biology of HCC at a time when an increasing number of treatment options, including targeted small molecular inhibitors and immuno-oncologic drugs are being used to treat patients in the absence of validated predictive biomarkers. This work will be of special interest to researchers investigating the basic biology of liver function and HCC, and also to readers investigating novel pathways for therapeutic targeting of HCC.

Evaluation statement (8 March 2024)

Seljeset et al. investigate the mechanism by which NMDA receptors are activated by co-agonists glutamate and glycine. By mutating residue Asp732 in the glycine-binding site, they generate receptors activated by glutamate, and not glycine, but inhibited by glycine antagonists. Conventional and unnatural amino acid mutagenesis reveals that Asp732 interacts with nearby residues to influence channel gating as well as ligand binding. Furthermore, a homomeric receptor from Trichoplax adhaerens, which has a tyrosine in the homologous position, displays constitutive activity that becomes glycine-dependent when the tyrosine is mutated to aspartate. The study is valuable because it reveals the importance of position 732 for controlling ligand potency and channel activity in glutamate receptors, which should lead to a better understanding of how these receptors are primed for channel opening.

Biophysics Colab recommends this study to scientists interested in the structure and function of glutamate receptors

Biophysics Colab has evaluated this study as one that meets the following criteria:

• Rigorous methodology
• Transparent reporting
• Appropriate interpretation

(This evaluation refers to version 2 of this preprint, which has been revised in response to peer review of version 1.)

eLife assessment

Using unbiased transcriptional profiling, the study reports a fundamental discovery of a novel hepatic lncRNA, FincoR, which regulates FXR. The convincing findings have therapeutic implications in the treatment of MASH. The authors use state-of-the-art methodology and use unbiased transcriptomic profiling and epigenetic profiling, including validation in mouse models and human samples.

eLife assessment

This study represents a step towards integrating human and non-human primate research towards a broader understanding of the neural control of motor strategies. It could offer valuable insights into how humans and non-human primates (Rhesus monkeys) manage visuomotor tasks, such as stabilizing an unstable virtual system, potentially leading to discoveries in neural behaviour mechanisms. While the evidence is mostly solid, some results, particularly from the binary classification of control strategies for non instructed behaviour, require further validation before it could be conclusively interpreted.

eLife assessment

In this important study, the authors set out to investigate the biogenesis of extracellular vesicles in mycobacteria and provide several observations to link VirR with vesiculogenesis, PG metabolism, lipid metabolism, and cell wall permeability. Whilst some of the evidence provided is convincing, data to support the proposed mechanism are somewhat incomplete. The work will be of interest to bacteriologists.

eLife assessment

This study addresses the long-standing question as to how different functional pools of synaptic vesicles are organized in presynaptic terminals to mediate different modes of neurotransmitter release. Based on imaging of active synapses with recycling synaptic vesicles labeled by FM-styryl dyes, the authors provide data that are compatible with the hypothesis that two separate reserve pools of vesicles – slowly vs. rapidly mobilizing – feed two distinct releasable pools – reluctantly vs. rapidly releasing. Overall, this study represents a valuable contribution to the field of synapse biology, specifically to presynaptic dynamics and plasticity. The authors' methodological approach of using bulk FM-styryl dye destaining as a readout of precise vesicle arrangements and pools in a population of functionally very diverse synapses has limitations. Consequently, the evidence that directly supports the authors' two-pool-interpretation of their data is incomplete, and alternative interpretations of the data remain possible.