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Bichir external gills arise via heterochronic shift that accelerates hyoid arch development

J. Stundl, A. Pospisilova, D. Jandzik, P. Fabian, B. Dobiasova, M. Minarik, BD. Metscher, V. Soukup, R. Cerny,

. 2019 ; 8 (-) : . [pub] 20190326

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/bmc20006506

Grantová podpora
1448514 Charles University Grant Agency - International
640016 Charles University Grant Agency - International
220213 Charles University Grant Agency - International
16-23836S Czech Science Foundation - International
726516 Charles University Grant Agency - International
Grant SVV 260434/2019 Charles University - International
Research Centre program 204069 Charles University - International
1/0415/17 Vedecká Grantová Agentúra MŠVVaŠ SR a SAV - International
751066 H2020 Marie Skłodowska-Curie Actions - International
260434/2019 The Charles University grant SVV - International
204069 The Charles University Research Centre program - International
1/0415/17 The grant of the Scientific Grant Agency of Slovak Republic VEGA - International
751066 The European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant - International

In most vertebrates, pharyngeal arches form in a stereotypic anterior-to-posterior progression. To gain insight into the mechanisms underlying evolutionary changes in pharyngeal arch development, here we investigate embryos and larvae of bichirs. Bichirs represent the earliest diverged living group of ray-finned fishes, and possess intriguing traits otherwise typical for lobe-finned fishes such as ventral paired lungs and larval external gills. In bichir embryos, we find that the anteroposterior way of formation of cranial segments is modified by the unique acceleration of the entire hyoid arch segment, with earlier and orchestrated development of the endodermal, mesodermal, and neural crest tissues. This major heterochronic shift in the anteroposterior developmental sequence enables early appearance of the external gills that represent key breathing organs of bichir free-living embryos and early larvae. Bichirs thus stay as unique models for understanding developmental mechanisms facilitating increased breathing capacity.

Citace poskytuje Crossref.org

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$a In most vertebrates, pharyngeal arches form in a stereotypic anterior-to-posterior progression. To gain insight into the mechanisms underlying evolutionary changes in pharyngeal arch development, here we investigate embryos and larvae of bichirs. Bichirs represent the earliest diverged living group of ray-finned fishes, and possess intriguing traits otherwise typical for lobe-finned fishes such as ventral paired lungs and larval external gills. In bichir embryos, we find that the anteroposterior way of formation of cranial segments is modified by the unique acceleration of the entire hyoid arch segment, with earlier and orchestrated development of the endodermal, mesodermal, and neural crest tissues. This major heterochronic shift in the anteroposterior developmental sequence enables early appearance of the external gills that represent key breathing organs of bichir free-living embryos and early larvae. Bichirs thus stay as unique models for understanding developmental mechanisms facilitating increased breathing capacity.
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