›› 2020, Vol. 32 ›› Issue (9): 1591-1608.DOI: 10.3969/j.issn.1004-1524.2020.09.08

• Animal Science • Previous Articles     Next Articles

Complete sequence and gene organization of mitochondrial genome of Megalobrama terminalis from Qiantang River

LIU Kai, FENG Xiaoyu, MA Hengjia, XIE Nan*   

  1. Institute of Fishery Science, Hangzhou Academy of Agricultural Sciences, Hangzhou 310024, China
  • Received:2020-03-02 Online:2020-09-25 Published:2020-10-10

Abstract: To study the mitochondrial genomic structure of Megalobrama terminalis Richardson from Qiantang River and phylogenetic relationship of Cultrinae subfamily, the amplification by PCR, sequencing, and software splicing were used to obtain complete mitochondrial genome of M. terminalis from Qiantang River, whose GenBank accession number was MN725725. The full-length sequence of the mitochondrial genome of M. terminalis from Qiantang River was 16 621 bp, and its base composition was A (31.23%), G (16.17%), C (27.87%), and T (24.73%). There were 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes in the mitochondrial genome. Except for NAD6, tRNA-Gln, tRNA-Ala, tRNA-Asn, tRNA-Cys, tRNA-Tyr, tRNA-Ser(UCN), tRNA-Glu, and tRNA-Pro, the other genes were encoded on the H chain. The A+T content of the mitochondrial genome and protein-coding genes in the mitochondria of M. terminalis from Qiangjiang River was 55.97% and 55.86%, respectively. The mitochondrial genome, and protein-coding genes in the mitochondria had obvious AT preference. There were two interspersed repeats in the mitochondrial gene, which were located at the front end of the terminal associated sequences region and the 3'end of the control region in the mitochondrial control region, respectively. Of the 22 tRNA genes, except tRNA-Ser(AGY), they had a typical clover secondary structure. Based on the comparison of BLAST, the consistency of M. terminalis from Qiantang River and Heilongjiang River was 99.76%, while the consistency of M. terminalis from Pearl River was 99.87%. Phylogenetic tree was constructed based on complete mitochondrial genomes of 15 species of Cultrinae subfamily belonging to 7 genera. The genetic relationship between Megalobrama and Parabramis was closer than that of Culter, and Megalobrama was far away from Hemiculter, Hemiculterella, and Metzia.

Key words: Megalobrama terminalis, mitochondrial genome, sequence analysis, phylogenetic tree

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