生物
线粒体DNA
进化生物学
遗传学
人口
细胞色素b
基因组
系统发育树
基因
细胞色素c氧化酶亚单位Ⅰ
核基因
否定选择
系统发育学
社会学
人口学
作者
Jeff H. T. Strohm,Rodger A. Gwiazdowski,Robert Hanner
出处
期刊:Gene
[Elsevier]
日期:2015-11-01
卷期号:572 (1): 27-34
被引量:30
标识
DOI:10.1016/j.gene.2015.06.074
摘要
Mitochondrial DNA is routinely used to answer a variety of biological questions; and there is growing evidence suggesting that its accumulation of mutations is influenced by life history, effective population size and cellular energy requirements. This study examines the influence of phylogenetic patterns of metabolic activity on the evolution of mitochondrial DNA in fishes, given energy requirements associated with high performance versus sedentary life histories. It was determined that all 13 protein coding genes of the mitogenome experience a relaxation of purifying selection in sedentary fishes. This phenomenon was not detected in nuclear housekeeping genes, suggesting that it can be explained by the energy requirements of these groups, and possibly their effective population sizes. This study also examined the subunit binding sites of two subunits of cytochrome c oxidase (COXI and COXIII), and did not detect any differences in selection between these groups of fishes. These cytochrome c oxidase subunits interact with subunits that are encoded by the nuclear genome and it has been suggested that a unique form of coevolution occurs between these genomes in order to maintain function, and may have implications for speciation. Although this was not a main focus of this study, our preliminary results suggest that substitutions in subunit binding site regions are rare. The results from this study add to the growing literature on the complex relationship between mitochondrial DNA and the evolution of life histories across the tree of life.
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