eLife assessment
This important work presents a systematic survey of downstream target genes of the BMP pathway during body-axis establishment of the cnidarian Nematostella vectensis. BMP is a well-known developmental regulator, and this work identifies a previously unknown array of downstream targets. Combining genomic approaches and genetic manipulations, the authors present convincing evidence that Zswim4-6 acts as a negative feedback regulator of BMP activity in Nematostella. The authors also test a zebrafish homologue in over-expression assays and show solid evidence that it too dampens BMP signaling activity, leading to the suggestion that zswim4-6 is a conserved regulator of BMP signaling. This work will be of interest to researchers in the fields of both developmental biology and evo-devo.