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MBE Advance Access published online on April 22, 2009
Molecular Biology and Evolution, doi:10.1093/molbev/msp085
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© The Author 2009. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Letter

Is Interlineage Recombination Responsible for Low Divergence of Mitochondrial nad3 Genes in Mytilus galloprovincialis?

Artur Burzynski and Beata Smietanka

Polish Academy of Sciences, Institute of Oceanology, Department of Genetics and Marine Biotechnology, Powstanców Warszawy 55, 81-712 Sopot, Poland

Corresponding author: Artur Burzynski, email: aburzynski{at}iopan.gda.pl, phone: 48587311763, fax: 48587311863

Received for publication February 13, 2009. Revision received April 8, 2009. Accepted for publication April 14, 2009.

The existence of mtDNA recombination in animals has been confirmed by several case studies. Still, for Mytilus mussels possessing two divergent mitochondrial genomes (M and F), which can recombine, no recombination between coding sequences of highly diverged M and F genomes has been shown. Based on the full sequences of both genomes, it has been suggested that particularly low divergence observed within the mitochondrial nad3 gene of the Mytilus galloprovincialis mussel may be caused by its exceptionally low evolutionary rate. Here we contribute a new pair of mitochondrial genomes typical for M. galloprovincialis and show that this low divergence is not a sign of evolutionary conservation but is rather caused by the acquisition of a F-related sequence by the published M genome of M. galloprovincialis. The most likely scenario for this apparent mtDNA coding region recombination case is an assembly artifact.

Key Words: mtDNA recombination • DUI • assembly errors • mitogenomics


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