Similar Datasets
Project description:The transition from fins to limbs has been a rich source of discussion for more than a century. One open and important issue is understanding how the mechanisms that pattern digits arose during vertebrate evolution. In this context, the analysis of Hox gene expression and functions to infer evolutionary scenarios has been a productive approach to explain the changes in organ formation, particularly in limbs. In tetrapods, the transcription of Hoxd genes in developing digits depends on a well-characterized set of enhancers forming a large regulatory landscape1,2. This control system has a syntenic counterpart in zebrafish, even though they lack bona fide digits, suggestive of deep homology3 between distal fin and limb developmental mechanisms. We tested the global function of this landscape to assess ancestry and source of limb and fin variation. In contrast to results in mice, we show here that the deletion of the homologous control region in zebrafish has a limited effect on the transcription of hoxd genes during fin development. However, it fully abrogates hoxd expression within the developing cloaca, an ancestral structure related to the mammalian urogenital sinus. We show that similar to the limb, Hoxd gene function in the urogenital sinus of the mouse also depends on enhancers located in this same genomic domain. Thus, we conclude that the current regulation underlying Hoxd gene expression in distal limbs was co-opted in tetrapods from a preexisting cloacal program. The orthologous chromatin domain in fishes may illustrate a rudimentary or partial step in this evolutionary co-option.
| S-EPMC10996561 | biostudies-literature
Project description: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.
2024-04-17 | GSE250264 | GEO
Project description: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.
2024-04-17 | GSE250367 | GEO
Project description: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.
2024-04-17 | GSE250266 | GEO
Project description: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.
2024-04-17 | GSE250265 | GEO
Project description: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.
2024-04-17 | GSE250263 | GEO
Project description: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.
2024-04-17 | GSE250368 | GEO
Project description:EVOLUTIONARY CO-OPTION OF AN ANCESTRAL CLOACAL REGULATORY LANDSCAPE WITH THE EMERGENCE OF DIGITS AND GENITALS
| PRJNA1053260 | ENA
Project description:EVOLUTIONARY CO-OPTION OF AN ANCESTRAL CLOACAL REGULATORY LANDSCAPE WITH THE EMERGENCE OF DIGITS AND GENITALS [cHiC]
| PRJNA1053265 | ENA
Project description:EVOLUTIONARY CO-OPTION OF AN ANCESTRAL CLOACAL REGULATORY LANDSCAPE WITH THE EMERGENCE OF DIGITS AND GENITALS [CUT&RUN]
| PRJNA1053266 | ENA