Trunk exoskeleton in teleosts is mesodermal in origin

Atsuko Shimada, Toru Kawanishi, Takuya Kaneko, Hiroki Yoshihara, Tohru Yano, Keiji Inohaya, Masato Kinoshita, Yasuhiro Kamei, Koji Tamura and Hiroyuki Takeda ()
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Atsuko Shimada: Graduate School of Science, University of Tokyo
Toru Kawanishi: Graduate School of Science, University of Tokyo
Takuya Kaneko: Graduate School of Science, University of Tokyo
Hiroki Yoshihara: Graduate School of Life Sciences, Tohoku University, Aobayama
Tohru Yano: Graduate School of Life Sciences, Tohoku University, Aobayama
Keiji Inohaya: Tokyo Institute of Technology
Masato Kinoshita: Graduate School of Agriculture, Kyoto University
Yasuhiro Kamei: Spectrography and Bioimaging Facility, National Institute for Basic Biology, Myodaiji
Koji Tamura: Graduate School of Life Sciences, Tohoku University, Aobayama
Hiroyuki Takeda: Graduate School of Science, University of Tokyo

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract The vertebrate mineralized skeleton is known to have first emerged as an exoskeleton that extensively covered the fossil jawless fish. The evolutionary origin of this exoskeleton has long been attributed to the emergence of the neural crest, but experimental evaluation for this is still poor. Here we determine the embryonic origin of scales and fin rays of medaka (teleost trunk exoskeletons) by applying long-term cell labelling methods, and demonstrate that both tissues are mesodermal in origin. Neural crest cells, however, fail to contribute to these tissues. This result suggests that the trunk neural crest has no skeletogenic capability in fish, instead highlighting the dominant role of the mesoderm in the evolution of the trunk skeleton. This further implies that the role of the neural crest in skeletogenesis has been predominant in the cephalic region from the early stage of vertebrate evolution.

Date: 2013
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DOI: 10.1038/ncomms2643

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