Abstract：
:Marine mussels of the genus Mytilus have two types of mitochondrial DNA with separate paternal and maternal inheritance. Females are homoplasmic for an F genome that is transmitted to all offspring, whereas males are heteroplasmic for this F genome and for a highly diverged (> 20%) M genome that is transmitted only to sons. Here we provide phylogenetic evidence based on lrRNA sequence data that most of the paternal genomes in European M. trossulus have an introgressive female M. edulis origin and are nearly indistinguishable in sequence from F types of M. trossulus. This observation is best explained by the hypothesis that introgressed F type molecules have recently invaded the paternal route and have assumed the role of M molecules, then resetting to zero the time of sequence divergence between M and F lineages. European M. trossulus shows a high prevalence of males heteroplasmic for three different mitochondrial DNA types all having the same two paternal types and the same maternal type, consistent with paternal co-transmission of multiple genomes. Co-transmission of the same genomes must apparently operate uninterruptedly for several generations in spite of the very different evolutionary origin of the specific molecules that are transmitted paternally and maternally in European M. trossulus.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Quesada H,Stuckas H,Skibinski DOdoi
10.1007/s00239-003-0019-ykeywords:
subject
Has Abstractpub_date
2003-01-01 00:00:00pages
S138-47eissn
0022-2844issn
1432-1432journal_volume
57 Suppl 1pub_type
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