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学科主题: Genetics & Heredity
题名: New features of Asian Crassostrea oyster mitochondrial genomes: A novel alloacceptor tRNA gene recruitment and two novel ORFs
作者: Wu, XY ; Li, XL ; Li, L ; Xu, XD ; Xia, JJ ; Yu, ZN
通讯作者: carlzyu@scsio.ac.cn
关键词: Crassostrea ; Mitochondrial genome ; tRNA gene recruitment ; Oyster ; atp8
刊名: GENE
发表日期: 2012
卷: 507, 期:2, 页:112-118
部门归属: [Wu, Xiangyun; Li, Xiaoling; Li, Lu; Xu, Xiaodong; Xia, Jianjun; Yu, Ziniu] Chinese Acad Sci, Key Lab Marine Bioresource Sustainable Utilizat, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Li, Xiaoling; Xu, Xiaodong] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
项目归属: LMB
摘要: A feasible way to perform evolutionary analyses is to compare characters divergent enough to observe significant differences, but sufficiently similar to exclude saturation of the differences that occurred. Thus, comparisons of invertebrate mitochondrial (mt) genomes at low taxonomic levels can be extremely helpful in investigating patterns of variation and evolutionary dynamics of genomes, as intermediate stages of the process may be identified. Fortunately, in this study, we newly sequenced the mt genome of the eighth member of Asian Crassostrea oysters which can provide necessary intermediate characters for us to believe that the variation of Crassostrea mt genomes is considerably greater than previously acknowledged. Several new features of Asian Crassostrea oyster mitochondrial genomes were revealed, and our results are particularly significant as they 1) suggest a novel model of alloacceptor tRNA gene recruitment, namely "vertical" tRNA gene recruitment, which can be successfully used to explain the origination of the unusually additional trnK and trnQ genes (annotated as trnK(2) and trnQ(2) respectively) in the mt genomes of the five Asian oysters, and we speculate that this recruitment progress may be a common phenomenon in the evolution of the tRNA multigene family; 2) reveal the existence of two additional, lineage-specific, mtDNA-encoded genes that may originate from duplication of nad2 followed by rapid evolutionary change. Each of these two genes encodes a unique amino terminal signal peptide, thus each might possess an unknown function; and 3) identify for the first time the atp8 gene in oysters. The present study thus gives further credence to the comparison of congeneric bivalves as a meaningful strategy to investigate mt genomic evolutionary trends in genome organization, tRNA multigene family, and gene loss and/or duplication that are difficult to undertake at higher taxonomic levels. In particular, our study provides new evidence for the identification and characterization of ORFs in the "non-coding region" of animal mt genomes. (c) 2012 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000308515000003
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9766
Appears in Collections:中科院海洋生物资源可持续利用重点实验室_期刊论文

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Recommended Citation:
Wu, XY; Li, XL; Li, L; Xu, XD; Xia, JJ; Yu, ZN.New features of Asian Crassostrea oyster mitochondrial genomes: A novel alloacceptor tRNA gene recruitment and two novel ORFs,GENE,2012,507(2):112-118
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