Characterization of 67 Mitochondrial tRNA Gene Rearrangements in the Hymenoptera Suggests That Mitochondrial tRNA Gene Position Is Selectively Neutral

被引:188
作者
Dowton, Mark [1 ]
Cameron, Stephen L. [2 ,3 ,4 ]
Dowavic, Jessica I. [1 ]
Austin, Andy D. [5 ]
Whiting, Michael F. [4 ]
机构
[1] Univ Wollongong, Ctr Biomed Sci, Sch Biol Sci, Wollongong, NSW 2522, Australia
[2] Australian Natl Insect Collect, Canberra, ACT, Australia
[3] CSIRO Entomol, Black Mt Labs, Canberra, ACT, Australia
[4] Brigham Young Univ, Dept Biol, Provo, UT 84602 USA
[5] Univ Adelaide, Australian Ctr Evolutionary Biol & Biodivers, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia
基金
澳大利亚研究理事会; 美国国家科学基金会;
关键词
duplication; random loss; tRNA gene; selectively neutral; mitochondrial genome; Hymenoptera; COMPLETE SEQUENCE; PHYLOGENETIC-RELATIONSHIPS; MOLECULAR-MECHANISMS; TANDEM DUPLICATION; GENOME PHYLOGENY; APOCRITA INSECTA; BASAL LINEAGES; BIAS AFFECTS; HOT-SPOT; EVOLUTION;
D O I
10.1093/molbev/msp072
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We present entire sequences of two hymenopteran mitochondrial genomes and the major portion of three others. We combined these data with nine previously sequenced hymenopteran mitochondrial genomes. This allowed us to infer and analyze the evolution of the 67 mitochondrial gene rearrangements so far found in this order. All of these involve tRNA genes, whereas four also involve larger (protein-coding or ribosomal RNA) genes. We find that the vast majority of mitochondrial gene rearrangements are independently derived. A maximum of four of these rearrangements represent shared, derived organizations, whereas three are convergently derived. The remaining mitochondrial gene rearrangements represent new mitochondrial genome organizations. These data are consistent with the proposal that there are an enormous number of alternative mitochondrial genome organizations possible and that mitochondrial genome organization is, for the most part, selectively neutral. Nevertheless, some mitochondrial genes appear less mobile than others. Genes close to the noncoding region are generally more mobile but only marginally so. Some mitochondrial genes rearrange in a pattern consistent with the duplication/random loss model, but more mitochondrial genes move in a pattern inconsistent with this model. An increased rate of mitochondrial gene rearrangement is not tightly associated with the evolution of parasitism. Although parasitic lineages tend to have more mitochondrial gene rearrangements than nonparasitic lineages, there are exceptions (e.g., Orussus and Schlettererius). It is likely that only a small proportion of the total number of mitochondrial gene rearrangements that have occurred during the evolution of the Hymenoptera have been sampled in the present study.
引用
收藏
页码:1607 / 1617
页数:11
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