题名: The first complete mitogenome of the South China deep-sea giant isopod Bathynomus sp (Crustacea: Isopoda: Cirolanidae) allows insights into the early mitogenomic evolution of isopods
作者: Shen, Yanjun1,2; Kou, Qi3; Zhong, Zaixuan1,2; Li, Xinzheng3; He, Lisheng4; He, Shunping1; Gan, Xiaoni1
刊名: ECOLOGY AND EVOLUTION
出版日期: 2017-03-01
卷号: 7, 期号:6, 页码:1869-1881
关键词: Bathynomus ; deep sea ; gene rearrangement ; Isopoda ; mitochondrial genome
英文摘要: In this study, the complete mitochondrial (mt) genome sequence of the South China deep-sea giant isopod Bathynomus sp. was determined, and this study is the first to explore in detail the mt genome of a deep-sea member of the order Isopoda. This species belongs to the genus Bathynomus, the members of which are saprophagous residents of the deep-sea benthic environment; based on their large size, Bathynomus is included in the "supergiant group" of isopods. The mt genome of Bathynomus sp. is 14,965bp in length and consists of 13 protein-coding genes, two ribosomal RNA genes, only 18 transfer RNA genes, and a noncoding control region 362bp in length, which is the smallest control region discovered in Isopoda to date. Although the overall genome organization is typical for metazoans, the mt genome of Bathynomus sp. shows a number of derived characters, such as an inversion of 10 genes when compared to the pancrustacean ground pattern. Rearrangements in some genes (e.g., cob, trnT, nad5, and trnF) are shared by nearly all isopod mt genomes analyzed thus far, and when compared to the putative isopod ground pattern, five rearrangements were found in Bathynomus sp. Two tRNAs exhibit modified secondary structures: The TC arm is absent from trnQ, and trnC lacks the DHU. Within the class Malacostraca, trnC arm loss is only found in other isopods. Phylogenetic analysis revealed that Bathynomus sp. (Cymothoida) and Sphaeroma serratum (Sphaeromatidea) form a single clade, although it is unclear whether Cymothoida is monophyletic or paraphyletic. Moreover, the evolutionary rate of Bathynomus sp. (dN/dS [nonsynonymous mutational rate/synonymous mutational rate]=0.0705) is the slowest measured to date among Cymothoida, which may be associated with its relatively constant deep-sea environment. Overall, our results may provide useful information for understanding the evolution of deep-sea Isopoda species.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Ecology ; Evolutionary Biology
关键词[WOS]: TRANSFER-RNA GENES ; MITOCHONDRIAL GENOME ; PHYLOGENETIC ANALYSIS ; MAXIMUM-LIKELIHOOD ; MARSUPIAL MITOCHONDRIA ; PROTEIN EVOLUTION ; DNA ; SEQUENCE ; REARRANGEMENTS ; DIVERSITY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000397458000018
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.idsse.ac.cn/handle/183446/1823]  
Appears in Collections:深海科学与工程研究所_深海科学研究部_深海生物学研究室_海洋生物生态与进化研究组_期刊论文


作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Aquat Biodivers & Conservat, Wuhan, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
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