作者: Kazuhiko Kawasaki , Chris T. Amemiya
DOI: 10.1002/JEZ.B.22546
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摘要: The coelacanth is the basal-most extant sarcopterygian that has teeth and tooth-like structures, comprising bone, dentin, enamel or enameloid. Formation of these tissues involves many members secretory calcium-binding protein (SCPP) family. In tetrapods, acidic-residue-rich SCPPs are used in mineralization bone whereas Pro/Gln-rich participate formation. Teleosts also employ for tissue mineralization. Nevertheless, repertoire largely different teleosts tetrapods; hence, filling this gap would be critical to elucidate early evolution mineralized osteichthyans. present study, we searched SCPP genes genome identified 11, which two have clear orthologs both tetrapods teleosts, seven only neither them. Given divergence times vertebrate lineages, our discovery shared between but not with suggests a complicated evolutionary scheme Our investigation revealed conserved derived characteristics other vertebrates. Notably, acidic independently evolved various repeats while maintaining high acidity, presumably important interactions calcium. Furthermore, three genes, required mineralizing matrix confirmed were all coelacanth, strongly suggesting equivalent tetrapods. This finding corroborates previous proposition true much earlier than origin J. Exp. Zool. (Mol. Dev. Evol.) 322B: 390–402, 2014. © 2013 Wiley Periodicals, Inc.