Evolution and functional divergence of monocarboxylate transporter genes in vertebrates
文献类型: 外文期刊
第一作者: Liu, Qingpo
作者: Liu, Qingpo;Dou, Shijuan;Wang, Guang'en;Li, Zhimin;Feng, Ying
作者机构:
关键词: MCT;Transporter;Phylogeny;Functional divergence;Functional constraint;Vertebrate
期刊名称:GENE ( 影响因子:3.688; 五年影响因子:3.329 )
ISSN: 0378-1119
年卷期: 2008 年 423 卷 1 期
页码:
收录情况: SCI
摘要: Monocarboxylate transporters (MCTs) form a gene family with an ancient past. The identification of MCTs (MCHs) from bacteria, protozoa, fungi, invertebrates, as well as vertebrates, but not from plants and virus, allowed illuminating the phylogenetic and evolutionary history of this gene family. The significant expansion of vertebrate MCT genes should have primarily occurred after the divergence of vertebrates and invertebrates, but before the divergence time between ray-finned fish and mammals. The divergence of insect MCTs should have at least occurred in the common ancestor of fruit fly, beetle, and honeybee. Fungi monocarboxylate transporter homologues (MCHs) might evolve independently from an ancient ancestor. The results of functional divergence analysis provided statistical evidences for shifted evolutionary rate and/or changes of amino acid property after gene duplication. The sliding window analysis of the d(N)/d(S) ratio values showed that strong functional constraints must impose on the N- and C-terminal domains of vertebrate MCTs. These corresponding regions may play crucial roles for functionality of MCT proteins. (C) 2008 Elsevier B.V. All rights reserved.
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