Signatures of functional constraint at Fgfr1a Genes in schizothoracine fishes (Pisces: Cypriniformes): The dermal skeleton variation adapted to high-altitude environments

Integrative Zoology
Xinyi GuoSongchang Guo

Abstract

Fishes harbor a huge resource of phenotypic diversity and are useful for understanding the genetic basis of morphological variation. However, it is difficult to transfer classical genetic mapping to most non-model species. In this study, we performed a comparative sequence analysis of Fgfr1a to first interpret the evolution of this candidate scale-loss gene in 15 schizothoracine fishes with various scale phenotypes. While considerable amino acid (AA) substitutions were observed, molecular evolution analysis indicates that the overall coding regions were subject to functional constraint. We also identified extra copies of Fgfr1a in 4 scale-loss fishes and detected accelerated evolution in one AA substitution specific to these duplicates. We speculate that Fgfr1a had accumulated mutations in the ancestral lineage of scale-loss schizothoracine fishes before experiencing duplication events, which was further followed by the diversification of species. In silico mutation analysis predicted deleterious effects of the mutations while no disruptive molecular mechanism was detected. Collectively, our results highlight the important role of Fgfr1a gene in the adaptive evolution of schizothoracine fishes during their radiation in the Qing...Continue Reading

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