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余鹏, 周莉, 杨小丽, 李亮亮, 金慧, 李志, 王忠卫, 李熙银, 张晓娟, 汪洋, 桂建芳. 2022: Chedrinae 亚科鱼类的线粒体基因组特征和系统发生. 动物学研究, 43(1): 30-32. DOI: 10.24272/j.issn.2095-8137.2021.243
引用本文: 余鹏, 周莉, 杨小丽, 李亮亮, 金慧, 李志, 王忠卫, 李熙银, 张晓娟, 汪洋, 桂建芳. 2022: Chedrinae 亚科鱼类的线粒体基因组特征和系统发生. 动物学研究, 43(1): 30-32. DOI: 10.24272/j.issn.2095-8137.2021.243
Peng Yu, Li Zhou, Xiao-Li Yang, Liang-Liang Li, Hui Jin, Zhi Li, Zhong-Wei Wang, Xi-Yin Li, Xiao-Juan Zhang, Yang Wang, Jian-Fang Gui. 2022: Comparative mitogenomic analyses unveil conserved and variable mitogenomic features and phylogeny of Chedrinae fish. Zoological Research, 43(1): 30-32. DOI: 10.24272/j.issn.2095-8137.2021.243
Citation: Peng Yu, Li Zhou, Xiao-Li Yang, Liang-Liang Li, Hui Jin, Zhi Li, Zhong-Wei Wang, Xi-Yin Li, Xiao-Juan Zhang, Yang Wang, Jian-Fang Gui. 2022: Comparative mitogenomic analyses unveil conserved and variable mitogenomic features and phylogeny of Chedrinae fish. Zoological Research, 43(1): 30-32. DOI: 10.24272/j.issn.2095-8137.2021.243

Chedrinae 亚科鱼类的线粒体基因组特征和系统发生

Comparative mitogenomic analyses unveil conserved and variable mitogenomic features and phylogeny of Chedrinae fish

  • 摘要: Chedrinae亚科属于鱼丹科,具有重要的观赏、经济和科研价值。至今,它们的线粒体基因组特征尚不清楚,且系统发育关系仍存在争议。该研究中,我们测定了5种Chedrinae鱼类的线粒体全基因组序列,并结合已经公布的线粒体基因组数据,比较分析了17种Chedrinae鱼类保守和变异的线粒体基因组特征。结果表明,Chedrinae鱼类的线粒体基因组成、排列以及tRNA的二级结构是高度保守的,但控制区的长度和碱基组成存在较大的差异。与其它Chedrina鱼类相比,滇西低线鱲(Barilius barila)的线粒体蛋白质编码基因的第一位密码子AT含量较低,且具有不同的密码子组成(codons per thousand codons, CDspT)。此外,B. bernatzikiOpsaridium ubangienseRaiamas senegalensis的控制区序列长度超过1 000 bp,且其5’端均有一段长串联重复序列(>291 bp)。虽然Chedrinae鱼类的tRNA二级结构很保守,但不同tRNA之间的二级结构不同,tRNALys 的DHU和TΨC环明显大于其它tRNA。系统发育树支持低线鱲属不是单系群,可分为AT含量不同的两个类群。该研究可为Chedrinae鱼类系统发生和保护生物学研究提供参考。

     

    Abstract: Chedrinae fish, which belong to Danionidae, have important ornamental, economic, and scientific value. At present, however, their mitogenomic features are unclear and their phylogenetic relationships remain controversial. In this study, we presented five new Chedrinae mitochondrial genomes (mitogenomes) and analyzed the conserved and variable mitogenomic characteristics of 17 Chedrinae fish. The gene composition and arrangement and secondary structure of transfer RNAs (tRNAs) were highly conserved among the Chedrinae mitogenomes. However, the length of the control region and base composition were variable. Interestingly, the mitogenome of Barilius barila was unusual, with lower A+T content in the first codon of protein-coding genes (PCGs) (47.32% versus average of 54.47%) and distinct pattern of codons per thousand codons (CDspT). Three Chedrinae fish had a long tandem repeat (>291 bp) in the 5'-end of the control region, which may increase their adaptability. In addition, tRNALys had notably larger DHU and TΨC loops than other tRNAs. The phylogenetic trees of the Chedrinae fish suggested that the Barilius genus was not a monophyletic group but could be divided into two main groups based on significant differences in A+T content. This study provides insights into the mitogenomic features and phylogenetic implications of Chedrinae fish, which should benefit their systematics and conservation.

     

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