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Type: Journal article
Title: Characterization of 67 Mitochondrial tRNA Gene Rearrangements in the Hymenoptera Suggests That Mitochondrial tRNA Gene Position Is Selectively Neutral
Author: Dowton, M.
Cameron, S.
Dowavic, J.
Austin, A.
Whiting, M.
Citation: Molecular Biology and Evolution, 2009; 26(7):1607-1617
Publisher: Oxford Univ Press
Issue Date: 2009
ISSN: 0737-4038
Statement of
Mark Dowton, Stephen L. Cameron, Jessica I. Dowavic, Andy D. Austin and Michael F. Whiting
Abstract: 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.
Keywords: duplication/random loss; tRNA gene; selectively neutral; mitochondrial genome; Hymenoptera
Description: © The Author 2009. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.
RMID: 0020090905
DOI: 10.1093/molbev/msp072
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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