Molecular Biology and Evolution, Vol 12, 735-747, Copyright © 1995 by Society for Molecular Biology and Evolution
DT Stewart, C Saavedra, RR Stanwood, AO Ball and E Zouros
In blue mussels of the Mytilus edulis species complex, mitochondrial DNA
(mtDNA) inheritance is coupled with gender. Females receive their mother's
mtDNA and pass it on to both their daughters and sons. In addition, males
receive mtDNA from their father and transmit this male mtDNA to their sons.
If this pattern of "doubly uniparental inheritance" is older than the M.
edulis species complex, then all members of this group must have two
distinct mtDNA lineages: a maternal lineage that is transmitted through
females and a paternal lineage that is transmitted through males. To test
this hypothesis, we scored mtDNA variation in two taxa in this complex, M.
edulis and M. trossulus, by means of restriction fragment profiles of
whole-mtDNA genomes and DNA sequence of a region of the cytochrome c
oxidase subunit III gene (COIII). The various mitotypes present in these
mussels were classified as "male" or "female" based on their gender
association and as belonging to M. edulis or M. trossulus based on
species-specific allozymes. Both maximum parsimony and neighbor-joining
phylogenies based on the COIII sequences grouped female and male mtDNAs
into two distinct lineages irrespective of specific origin in accordance
with the hypothesis that the origin of these lineages predates the
divergence of M. edulis and M. trossulus.
ORIGINAL ARTICLE
Male and female mitochondrial DNA lineages in the blue mussel (Mytilus edulis) species group
Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
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