Comparative mitochondrial genome analysis of Cynoglossidae(Teleost:Pleuronectiformes)and phylogenetic implications  

作　　者：Bilin Hu Tingqi Jiang Liming Wei Nannan Zhang Kaixin Wang Liqin Liu Bingjian Liu Jing Liu Zhenming Lü Li Gong 

机构地区：[1]National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization,Zhejiang Ocean University,Zhoushan 316022,China [2]Marine Science and Technology College,Zhejiang Ocean University,Zhoushan 316022,China

出　　处：《Acta Oceanologica Sinica》2023年第11期69-80,共12页海洋学报（英文版）

基　　金：The Natural Science Foundation of Zhejiang Province under contract No.LY21C190007;the Basic Scientific Research Operating Expenses of Zhejiang Provincial Universities under contract No.2021JZ003;the Zhoushan Science and Technology Bureau under contract No.2021C21007。

摘　　要：Generally,a teleostean group(e.g.,family or genus)owns one type or a set of similar mitochondrial gene arrangement.It is interesting,however,that four different types of gene arrangement have been found in the mitochondrial genome(mitogenome)of Cynoglossidae species.So far,the possible mechanisms of mitogenomic gene rearrangement and its potential implications have aroused widespread attention and caused lots of controversy.Here,a total of 21 Cynoglossidae mitogenomes and a newly sequenced mitogenome of Cynoglossus puncticpes(Pleuronectiformes:Cynoglossidae)were compared.The length ranges from 16417 bp to 18369 bp,which is mainly caused by the length heteroplasmy of control region(CR).Further analysis reveals that the difference of tandem repeats acts as a determining factor resulting in the length heterogeneity.Like most gene rearrangements of Cynoglossinae mitogenomes,tRNA-Gln gene encoded by the L-strand has translocated to the H-strand(Q inversion),accompanied by the translocation of CR in C.puncticpes mitogenome.The typical IQM order(tRNA-Ile-Gln-Met)changed to QIM order.Tandem duplication/random loss and mitochondrial recombination were accepted as the most possible models to account for the rearrangements in C.puncticpes mitogenome.Phylogenetic trees showed a strong correlation between the gap spacer in the rearranged QIM area and phylogeny,which provides a fresh idea for phylogenetic studies in future.

关 键 词：MITOGENOME gene rearrangement tandem duplication/random loss mitochondrial inversion control region phylogenetic study 

分 类 号：Q953[生物学—动物学]