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The Complete Mitochondrial Genome of Provides a Well-Resolved Molecular Phylogeny of the Chinese Sisorid Catfishes

Overview
Journal Genes (Basel)
Publisher MDPI
Date 2018 Jun 6
PMID 29867051
Citations 11
Authors
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Abstract

Previous phylogenetic analyses of the Chinese sisorid catfishes have either been poorly resolved or have not included all the 12 sisorid genera. Here, we successfully assembled the first complete mitochondrial genome of the sisorid fish . Based on this novel mitochondrial genome and previously published mitochondrial genomes in the Sisoridae, we generated maximum likelihood and Bayesian phylogenies. We dated our preferred topology using fossil calibration points. We also tested the protein-coding genes in the mitochondrial genomes of the glyptosternoid fishes for signals of natural selection by comparing the nucleotide substitution rate along the branch ancestral to the glyptosternoid fishes to other branches in our topology. The mitochondrial sequence structure of was similar to those known from other vertebrates, with some slight differences. Our sisorid phylogenies were well-resolved and well-supported, with exact congruence between the different phylogenetic methods. This robust phylogeny clarified the relationships among the Chinese sisorid genera and strongly supported the division of the family into three main clades. Interestingly, the glyptosternoid divergence time predicted by our molecular dating analysis coincided with the uplift of the Tibetan Plateau, suggesting that geology may have influenced speciation in the Sisoridae. Among the mitochondrial protein-coding genes, may have most rapidly evolved, and may have been subjected to positive selection pressure to adapt to high elevations. In summary, this study provided novel insights into the phylogeny, evolution and high-altitude adaptions of the Chinese sisorid fishes.

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