Sarcopterygian fin ontogeny elucidates the origin of hands with digits

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2020
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Ericsson, Rolf
Joss, Jean M. P.
Sordino, Paolo
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Comparative genomics of parallel in repeated adaptive radiations (GenAdap)
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Science Advances. American Association for the Advancement of Science (AAAS). 2020, 6(34), eabc3510. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.abc3510
Zusammenfassung

How the hand and digits originated from fish fins during the Devonian fin-to-limb transition remains unsolved. Controversy in this conundrum stems from the scarcity of ontogenetic data from extant lobe-finned fishes. We report the patterning of an autopod-like domain by hoxa13 during fin development of the Australian lungfish, the most closely related extant fish relative of tetrapods. Differences from tetrapod limbs include the absence of digit-specific expansion of hoxd13 and hand2 and distal limitation of alx4 and pax9, which potentially evolved through an enhanced response to shh signaling in limbs. These developmental patterns indicate that the digit program originated in postaxial fin radials and later expanded anteriorly inside of a preexisting autopod-like domain during the evolution of limbs. Our findings provide a genetic framework for the transition of fins into limbs that supports the significance of classical models proposing a bending of the tetrapod metapterygial axis.

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ISO 690WOLTERING, Joost M., Iker IRISARRI, Rolf ERICSSON, Jean M. P. JOSS, Paolo SORDINO, Axel MEYER, 2020. Sarcopterygian fin ontogeny elucidates the origin of hands with digits. In: Science Advances. American Association for the Advancement of Science (AAAS). 2020, 6(34), eabc3510. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.abc3510
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@article{Woltering2020-08-19Sarco-50565,
  year={2020},
  doi={10.1126/sciadv.abc3510},
  title={Sarcopterygian fin ontogeny elucidates the origin of hands with digits},
  number={34},
  volume={6},
  journal={Science Advances},
  author={Woltering, Joost M. and Irisarri, Iker and Ericsson, Rolf and Joss, Jean M. P. and Sordino, Paolo and Meyer, Axel},
  note={Article Number: eabc3510}
}
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