Evolution of NADH dehydrogenase subunit 2 in east African cichlid fish
Evolution of NADH dehydrogenase subunit 2 in east African cichlid fish
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DOI：
10.1006/mpev.1995.1039
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发表时间：
1995-12-01
影响因子：
4.1
通讯作者：
Lockwood, SF
中科院分区：
文献类型：
--
作者：
Kocher, TD;Conroy, JA;Lockwood, SF
为了研究东非湖泊鱼类种群的进化史，从31种鱼类中获得了线粒体编码的ND2基因的完整序列(1047bp)，该序列的核苷酸替换模式是典型的线粒体基因，表现出高度的过渡偏向和快速的突变饱和，特别是在碱基频率不相等的密码子位置。密码子第三位的碱基组成在物种间是不同的，表明替换模式经常发生变化。序列的系统发育分析表明，马拉维湖慈鱼的mtDNA变异是单系嵌套的，与坦噶尼康的变异范围相同。马拉维羊群最接近的坦噶尼坎亲戚是特罗菲尼部落的成员。基于形态的分类通常得到mtDNA数据的支持，但在Tropheini和Lamprologini中有一些显著的例外。由于坦噶尼坎谱系的辐射明显很快，目前很难评估坦噶尼坎辐射的基本拓扑结构。部落之间的差异与过去1000万年内的湖内辐射是一致的。(C)1995年学术出版社。
The complete sequence (1047 bp) of the mitochondrially encoded ND2 gene was obtained from 31 species of cichlid fishes to investigate the evolutionary history of the species flocks of the East African lakes, The observed pattern of nucleotide substitution in this sequence is typical of mitochondrial genes, showing a high transition bias and rapid mutational saturation, especially at codon positions where base frequencies are unequal. The base composition of the third position of codons is heterogeneous among species, suggesting frequent shifts in the pattern of substitution, Phylogenetic analysis of the sequences shows that the mtDNA variation in Lake Malawi cichlids is nested monophyletically within the range of variation shown by Tanganyikan cichlids. The closest Tanganyikan relatives of the Malawi flock are members of the tribe Tropheini. Classifications based on morphology are generally supported by the mtDNA data, with some significant exceptions in the Tropheini and Lamprologini. Because of an apparently rapid radiation of the Tanganyikan lineages, it is difficult to assess the basal topology of the Tanganyikan radiation at this time. Divergences among tribes are consistent with an intralacustrine radiation within the past 10 million years. (C) 1995 Academic Press, Inc.