Evidence that mechanisms of fin development evolved in the midline of early vertebrates

@article{Freitas2006EvidenceTM,
  title={Evidence that mechanisms of fin development evolved in the midline of early vertebrates},
  author={Renata Freitas and GuangJun Zhang and Martin J. Cohn},
  journal={Nature},
  year={2006},
  volume={442},
  pages={1033-1037}
}
The origin of paired appendages was a major evolutionary innovation for vertebrates, marking the first step towards fin- (and later limb-) driven locomotion. The earliest vertebrate fossils lack paired fins but have well-developed median fins, suggesting that the mechanisms of fin development were assembled first in the midline. Here we show that shark median fin development involves the same genetic programs that operate in paired appendages. Using molecular markers for different cell types… Expand
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  • Z. Johanson
  • Biology, Medicine
  • Journal of experimental zoology. Part B, Molecular and developmental evolution
  • 2010
TLDR
An evolutionary scenario is proposed where these fin-like structures develop from somites, in the same manner as dorsal, unpaired fins, where the lateral somitic frontier and the abaxial region of the body evolve. Expand
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  • Developmental biology
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Investigating Hoxd gene expression during paired fin development in the shark Scyliorhinus canicula finds that at early stages, 5′Hoxd genes are expressed in anteroposteriorly nested patterns, consistent with the initial wave of HoxD transcription in teleost and tetrapod paired appendages. Expand
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