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The complete mitochondrial genome of the Sichuan taimen (Hucho bleekeri): Repetitive sequences in the control region and phylogenetic implications for Salmonidae

文献类型： 外文期刊

作者： Wang, Ying 2 ; Guo, Rui 2 ; Li, Hua 1 ; Zhang, Xiuyue 2 ; Du, Jun 1 ; Song, Zhaobin 2 ;

作者机构： 1.Sichuan Acad Agr Sci, Fisheries Res Inst, Chengdu 611731, Peoples R China

2.Sichuan Univ, Coll Life Sci, Sichuan Key Lab Conservat Biol Endangered Wildlif, Chengdu 610064, Peoples R China

关键词： Mitochondrial DNA;Genome structure;Tandem repeat;Phylogenetic analysis;Hucho bleekeri;Salmonidae

期刊名称：MARINE GENOMICS （ 影响因子：1.71； 五年影响因子：1.969 ）

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收录情况： SCI

摘要： The complete mitochondrial DNA genome of the Sichuan taimen (Hucho bleekeri) was determined by the long and accurate polymerase chain reaction (LA-PCR) and primer walking sequence method. The entire mitochondrial genome of this species is 16,997 bp in length, making it the longest among the completely sequenced Salmonidae mitochondrial genomes. It consists of two ribosomal RNA (rRNA) genes, 13 proteincoding genes, 22 transfer RNA (tRNA) genes, and one control region (CR). The gene arrangement, nucleotide composition, and codon usage pattern of the mitochondrial genome are similar to those of other teleosts. A T-type mononucleotide microsatellite and an 82 bp tandem repeat were identified in the control region, which were almost identical among the three H. bleekeri individuals examined. Both phylogenetic analyses based on 12 concatenated protein-coding genes of the heavy strand and on just the control region show that H. bleekeri is a basal species in Salmoninae. In addition, Salmo, Salvelinus and Oncorhynchus all represent monophyletic groups, respectively. All freshwater species occupied basal phylogenetic positions, and also possessed various tandem repeats in their mitochondrial control regions. These results support established phylogenetic relationships among genera in Salmonidae based on morphological and molecular analyses, and are consistent with the hypothesis that Salmonidae evolved from freshwater species.

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