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MBE Advance Access published online on March 5, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg058
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted November 8, 2002
© 2003 Society for Molecular Biology and Evolution

Original Articles

Evidence for Recombination of mtDNA in the Marine Mussel Mytilus trossulus from the Baltic

Artur Burzynski 1*, Malgorzata Zbawicka 1, David O. F. Skibinski 2, Roman Wenne 1

1 Polish Academy of Sciences, Institute of Oceanology, Department of Genetics and Marine Biotechnology, Gdynia, Poland
2 School of Biological Sciences, University of Wales Swansea, Swansea, UK

* To whom correspondence should be addressed. E-mail: burzynski{at}cbmpan.gdynia.pl.


  Abstract

A number of studies have claimed that recombination occurs in animal mtDNA though this evidence is controversial. Ladoukakis and Zouros (2001) provided strong evidence for mtDNA recombination in the COIII gene in gonadal tissue in the marine mussel Mytilus galloprovincialis from the Black Sea. The recombinant molecules they reported had not however become established in the population from which experimental animals were sampled. In the present study we provide further evidence of the generality of mtDNA recombination in Mytilus by reporting recombinant mtDNA molecules in a related mussel species, Mytilus trossulus, from the Baltic. The mtDNA region studied begins in the 16S rRNA gene and terminates in the cytochrome b gene and includes a major non-coding region that may be analogous to the D-loop region observed in other animals. Many bivalve species including some Mytilus species are unusual having two mtDNA genomes, one of which is inherited maternally (F genome) the other inherited paternally (M genome). Two recombinant variants reported in the present study have population frequencies of 5% and 36% and appear to be mosaic for F and M like sequence. However both variants have the non-coding region from the M genome and both are transmitted to sperm like the M genome. We speculate that acquisition of the non-coding region by the recombinant molecules has conferred a paternal role on mtDNA genomes that otherwise resemble the F genome in sequence.

Key Words: mtDNA recombination, Mytilus, D-Loop, DUI


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