Molecular Phylogeny and Adaptive Mitochondrial DNA Evolution of Salmonids (Pisces: Salmonidae)

Overview

Journal Front Genet

Date 2022 Jul 5

PMID 35783273

Authors

Ying Wang

Fei Xiong

Zhaobin Song

Affiliations

Soon will be listed here.

Abstract

Salmonids are composed of anadromous and freshwater fishes, which is an important model for studying adaptive evolution. Herein, 49 salmonid complete mitochondrial genomes and those of two outgroups were used to infer a robust phylogeny for the family Salmonidae. The BI and RAxML phylogenetic trees based on 13 concatenated mitochondrial protein-coding genes showed well-supported nodes, and topologies were highly congruent. The concatenated 13 mitochondrial protein-coding genes, , , and genes were shown to have significantly larger ratios in anadromous species than in freshwater species of Salmonidae, but the gene had significantly smaller in anadromous species. The FEL analysis identified positively selected sites and negatively selected sites in each mitochondrial protein-coding gene separately. The RELAX program revealed that the and genes supported intensified selection of the anadromous lineages. Our results demonstrated the phylogeny of Salmonidae and explored the mitochondrial DNA evolution pattern between anadromous and freshwater salmonids.

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