Molecular Biology and Evolution, Vol 14, 959-967, Copyright © 1997 by Society for Molecular Biology and Evolution
WR Hoeh, DT Stewart, C Saavedra, BW Sutherland and E Zouros
Distinct gender-associated mitochondrial DNA (mtDNA) lineages (i.e.,
lineages which are transmitted either through males or through females)
have been demonstrated in two families of bivalves, the Mytilidae (marine
mussels) and the Unionidae (freshwater mussels), which have been separated
for more than 400 Myr. The mode of transmission of these M (for
male-transmitted) and F (for female-transmitted) molecules has been
referred to as doubly uniparental inheritance (DUI), in contrast to
standard maternal inheritance (SMI), which is the norm in animals. A
previous study suggested that at least three origins of DUI are required to
explain the phylogenetic pattern of M and F lineages in freshwater and
marine mussels. Here we present phylogenetic evidence based on partial
sequences of the cytochrome c oxidase subunit I gene and the 16S RNA gene
that indicates the DUI is a dynamic phenomenon. Specifically, we
demonstrate that F lineages in three species of Mytilus mussels, M. edulis,
M. trossulus, and M. californianus, have spawned separate lineages which
are now associated only with males. This process is referred to as
"masculinization" of F mtDNA. By extension, we propose that DUI may be a
primitive bivalve character and that periodic masculinization events
combined with extinction of previously existing M types effectively reset
the time of divergence between conspecific gender-associated mtDNA
lineages.
ORIGINAL ARTICLE
Phylogenetic evidence for role-reversals of gender-associated mitochondrial DNA in Mytilus (Bivalvia: Mytilidae)
Department of Biology, Dalhousie University.
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