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土库曼蝗线粒体基因组特征及其系统发育分析

Characteristics and Phylogenetic Analysis of Mitochondrial Genome in Ramburiella turcomana

  • 摘要: 土库曼蝗(Ramburiella turcomana)是新疆草原常见的危害蝗虫。本研究基于二代测序技术获得土库曼蝗线粒体全基因组序列,并对其进行注释及特征分析。采用近邻相接法(neighbor joining method, NJ)和贝叶斯法(bayesian inference method, BI)构建网翅蝗科(Arcypteridae)系统发育树。结果表明,土库曼蝗线粒体基因为双链环状DNA,全长15 670 bp,具有明显AT偏好(72.21%),共编码37个基因,包括13个蛋白编码基因、 22个tRNA编码基因、 2个rRNA编码基因,以及1个非编码控制区域(D-loop区)。土库曼蝗线粒体基因组发生了蝗亚目(Locustodea)普遍存在的DK重排(DK rearrangement)现象。基于网翅蝗科已报道物种线粒体全基因组构建的NJ树和BI树具有相同的拓扑结构,其中土库曼蝗与16种网翅蝗亚科(Arcypterinae)蝗虫聚为一支,并位于网翅蝗亚科最基部,其余6种竹蝗亚科(Ceracrinae)蝗虫聚为一支,暗示土库曼蝗是网翅蝗亚科中较古老的物种。本研究公布的土库曼蝗线粒体全基因组为土库曼蝗属(Ramburiella)中首次报道,为挖掘土库曼蝗属其他物种线粒体全基因组提供了分子生物学参考。

     

    Abstract: Ramburiella turcomana is a common locust in the grasslands of Xinjiang.In this study, the mitochondrial whole genome sequence of Ramburiella turcomana was obtained based on second generation sequencing technology, and the characteristics were annotated and characterized. A phylogenetic tree of Arcypteridae was constructed using neighbor joining method(NJ) and bayesian inference method(BI).The results showed that the Ramburiella turcomana mitochondrial genome was a double-stranded circular DNA, 15 670 bp in length, with a clear AT preference(72.21%), encoding a total of 37 genes, including 13 protein-coding genes, 22 tRNA-coding genes, 2 rRNA-coding genes, and 1 non-coding control region(D-loop region).The Ramburiella turcomana mitochondrial genome underwent the DK rearrangement prevalent in Locustodea.The NJ and BI trees constructed on the basis of mitochondrial whole genomes of reported species of Arcypteridae shared the same topology, with Ramburiella turcomana clustered with total 16 species of Arcypterinae locusts and located at the base of the Arcypterinae, and the remaining six species of Ceracrinae locusts clustered in one group, suggesting that Ramburiella turcomana was the older species of Arcypterinae.The whole mitochondrial genome of Ramburiella turcomana published in this study is the first report in Ramburiella and provides a molecular biological reference for the excavation of the whole mitochondrial genome of other species of Ramburiella.

     

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