Nonhomologous Recombination Between the Large Unassigned Region of the Male and Female Mitochondrial Genomes in the Mussel, Mytilus trossulus |
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Authors: | Paul D Rawson |
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Institution: | (1) School of Marine Sciences, University of Maine, 5751 Murray Hall, Orono, ME 04469-5751, USA |
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Abstract: | Doubly uniparental inheritance of mtDNA (DUI) is commonly observed in several genera of bivalves. Under DUI, female offspring
inherit mtDNA from their mothers, while male offspring inherit mtDNA from both parents but preferentially transmit the paternally
inherited mtDNA to their sons. Several studies have shown that the female- and male-specific mtDNA lineages in blue mussels,
Mytilus spp., vary by upward of 20% at the nucleotide level. In addition to high levels of nucleotide substitution, the present study
observed substantial gender-based length polymorphism in the presumptive mitochondrial control region (=large unassigned region;
LUR) of North American M. trossulus. In this species, female lineage LUR haplotypes are over 2 kb larger than male lineage LUR haplotypes. Analysis of sequence
data for these length variants indicates that the F LUR haplotypes of North American M. trossulus contain sequences similar to the F lineage control region in the congeners M. edulis and M. galloprovincialis. Relative to the F LUR in the latter two species, however, the F lineage LUR haplotypes in M. trossulus contain two large sequence insertions, each nearly 1 kb in size. One of these insertions has high sequence similarity to
the male lineage LUR of M. trossulus. The tandem arrangement of F and M control region sequences in the F lineage LUR of M. trossulus is most likely the result of nonhomologous recombination between the male and the female mitochondrial genomes in M. trossulus, a finding that has important implications regarding the transmission and evolution of blue mussel mitochondrial genomes.
Reviewing Editor: Dr. Martin Kreitman] |
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Keywords: | mtDNA recombination Doubly uniparental inheritance Length heteroplasmy Mytilus |
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