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EVOLUTIONARY CO-OPTION OF AN ANCESTRAL CLOACAL REGULATORY LANDSCAPE WITH THE EMERGENCE OF DIGITS AND GENITALS [cHiC]

ABSTRACT: The existence of homologies between fins and tetrapod limb skeletal parts as well as of the nature of those mechanisms underlying the transition of the former towards the latter, have been a rich source of discussion for more than a century. While the recent use of gene expression patterns to try and infer evolutionary scenarios has been a popular and successful approach, in particular the distribution of Hox transcript domains, it has failed to provide clearcut evidence as to whether fishes do have bony elements related by ancestry to tetrapod hands and feet. In tetrapods, posterior Hoxd genes transcription in digits is controlled by a well-characterized series of enhancers forming a large regulatory landscape, which has its syntenic counterpart in zebrafish. We show here that the deletion of the orthologous landscape in fishes does not affect the transcription of these genes in fin buds. Instead, it abrogates hoxd expression in the cloaca, an essential structure related to the mammalian uro-genital sinus. We also report that Hoxd gene function in the mammalian uro-genital sinus depends on enhancers located in the same regulatory landscape and thus conclude that an ancestral Hox ‘cloacal’ regulation was co-opted, in tetrapod, as a playground to subsequently accompany the evolution of both external genitals and digits regulatory landscapes, along with the emergence of these developmentally and phylogenetically related structures.

ORGANISM(S): Mus musculus

PROVIDER: GSE250264 | GEO | 2024/04/17

REPOSITORIES: GEO

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EVOLUTIONARY CO-OPTION OF AN ANCESTRAL CLOACAL REGULATORY LANDSCAPE WITH THE EMERGENCE OF DIGITS AND GENITALS [HiC-seq re-analysis]

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Convergent evolution of complex regulatory landscapes and pleiotropy at Hox loci (RNA-seq)

Project description:Hox genes are required during the morphogenesis of both vertebrate digits and external genitals.We investigated whether transcription in such distinct contexts involves a shared enhancer-containing landscape. We show that the same regulatory topology is used, yet with some tissue-specific enhancer-promoter interactions, suggesting the hijacking of a regulatory backbone from one context to the other. In addition, comparable organizations are observed at both HoxA and HoxD clusters, which separated through genome duplication in an ancestral invertebrate animal.We propose that this convergent regulatory evolution was triggered by the pre-existence of some chromatin architecture, thus facilitating the subsequent recruitment of the appropriate transcription factors. Such regulatory topologies may have both favored and constrained the evolution of pleiotropic developmental loci in vertebrates. RNA-seq from mouse E12.5 digits cells and mouse E15.5 genital tubercle cells.

2014-11-21 | E-GEOD-62268 | biostudies-arrayexpress

Transcription profiling of mouse forelimb autopods and genital buds from wild type and homozygous Del9 E12.5 embryos

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2005-06-30 | E-MEXP-257 | biostudies-arrayexpress

Convergent evolution of complex regulatory landscapes and pleiotropy at Hox loci (4C-seq)

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2014-11-21 | E-GEOD-62265 | biostudies-arrayexpress

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