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Type: Journal article
Title: Coexistence of minicircular and a highly rearranged mtDNA molecule suggests that recombination shapes mitochondrial genome organization
Author: Mao, M.
Austin, A.
Johnson, N.
Dowton, M.
Citation: Molecular Biology and Evolution, 2014; 31(3):636-644
Publisher: Oxford University Press
Issue Date: 2014
ISSN: 0737-4038
Statement of
Meng Mao, Andrew D. Austin, Norman F. Johnson, and Mark Dowton
Abstract: Recombination has been proposed as a possible mechanism to explain mitochondrial (mt) gene rearrangements, although the issue of whether mtDNA recombination occurs in animals has been controversial. In this study, we sequenced the entire mt genome of the megaspilid wasp Conostigmus sp., which possessed a highly rearranged mt genome. The sequence of the A+T-rich region contained a number of different types of repeats, similar to those reported previously in the nematode Meloidogyne javanica, in which recombination was discovered. In Conostigmus, we detected the end products of recombination: a range of minicircles. However, using isolated (cloned) fragments of the A+T-rich region, we established that some of these minicircles were found to be polymerase chain reaction (PCR) artifacts. It appears that regions with repeats are prone to PCR template switching or PCR jumping. Nevertheless, there is strong evidence that one minicircle is real, as amplification primers that straddle the putative breakpoint junction produce a single strong amplicon from genomic DNA but not from the cloned A+T-rich region. The results provide support for the direct link between recombination and mt gene rearrangement. Furthermore, we developed a model of recombination which is important for our understanding of mtDNA evolution.
Keywords: mtDNA
gene rearrangement
PCR artifact
Rights: © The Author 2013.
DOI: 10.1093/molbev/mst255
Appears in Collections:Aurora harvest 7
Ecology, Evolution and Landscape Science publications

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