Abstract
Tetrapod limbs evolved from paired fins. Although the limbs and fins share similar sets of tissue components, structure, and developmental processes, some characteristics of the skeletal morphology of fins are distinct from those of limbs. Fin rays, the distal-most components of the fin, consist of several types of tissues not seen in tetrapods. The fin ray skeletons of teleosts have the same developmental origin (lateral plate mesoderm, LPM) as that of the basal endoskeleton that also develops in the fin bud. The ectodermal jacket of the fin bud has a ridge along the dorsoventral border called the apical ectodermal ridge (AER), which elongates into the apical fold (AF) during development. Tetrapod limb buds never undergo this transformation, suggesting that epithelial changes might be the key to understanding the evolutionary developmental mechanism behind the fin-to-limb transition. The epithelial transformation involves a change in cell shape, which may have played a role in the fin-to-limb evolution.
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Acknowledgments
We thank all members of Tamura laboratory for helpful discussions on the manuscript. We would also like to thank Editage (www.editage.com) for English language editing. This work was supported by JSPS KAKENHI [grant numbers 18H04756, 18H04811, 18H02446, and 19H03289].
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Tanaka, Y., Kudoh, H., Abe, G., Yonei-Tamura, S., Tamura, K. (2020). Evo-Devo of the Fin-to-Limb Transition. In: Nuno de la Rosa, L., Müller, G. (eds) Evolutionary Developmental Biology. Springer, Cham. https://doi.org/10.1007/978-3-319-33038-9_193-1
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DOI: https://doi.org/10.1007/978-3-319-33038-9_193-1
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