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Complete mitogenome sequences of four flatfishes (Pleuronectiformes) reveal a novel gene arrangement of L-strand coding genes

文献类型： 外文期刊

作者： Shi, Wei 1 ; Dong, Xiao-Li 2 ; Wang, Zhong-Ming 1 ; Miao, Xian-Guang 1 ; Wang, Shu-Ying 1 ; Kong, Xiao-Yu 1 ;

作者机构： 1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China

2.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin 150070, Peoples R China

3.Marine Fisheries Res Inst Zhejiang, Key Lab Sustainable Utilizat Technol Res Fishery, Zhoushan 316100, Peoples R China

期刊名称：BMC EVOLUTIONARY BIOLOGY （ 影响因子：3.26； 五年影响因子：3.732 ）

ISSN： 1471-2148

年卷期： 2013 年 13 卷

页码：

收录情况： SCI

摘要： Background: Few mitochondrial gene rearrangements are found in vertebrates and large-scale changes in these genomes occur even less frequently. It is difficult, therefore, to propose a mechanism to account for observed changes in mitogenome structure. Mitochondrial gene rearrangements are usually explained by the recombination model or tandem duplication and random loss model. Results: In this study, the complete mitochondrial genomes of four flatfishes, Crossorhombus azureus (blue flounder), Grammatobothus krempfi, Pleuronichthys cornutus, and Platichthys stellatus were determined. A striking finding is that eight genes in the C. azureus mitogenome are located in a novel position, differing from that of available vertebrate mitogenomes. Specifically, the ND6 and seven tRNA genes (the Q, A, C, Y, S1, E, P genes) encoded by the L-strand have been translocated to a position between tRNA-T and tRNA-F though the original order of the genes is maintained. Conclusions: These special features are used to suggest a mechanism for C. azureus mitogenome rearrangement. First, a dimeric molecule was formed by two monomers linked head-to-tail, then one of the two sets of promoters lost function and the genes controlled by the disabled promoters became pseudogenes, non-coding sequences, and even were lost from the genome. This study provides a new gene-rearrangement model that accounts for the events of gene-rearrangement in a vertebrate mitogenome.

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