MBE Advance Access published online on August 29, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg218
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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1 Department of Biological Sciences, Biodiversity and Systematics, University of Alabama, Box 870345, Tuscaloosa, Alabama 35487-0345 USA
* To whom correspondence should be addressed. E-mail: serb001{at}bama.ua.edu.
Molluscs in general, and bivalves in particular, exhibit an extraordinary degree of mitochondrial gene order variation when compared with other metazoans. Two factors inhibiting our understanding the evolution of gene rearrangement in bivalves are inadequate taxonomic sampling and failure to examine gene order in a phylogenetic framework. Here we report the first complete nucleotide sequence (16,060 bp) of the mitochondrial (mt) genome of a North American freshwater bivalve, Lampsilis ornata (Mollusca: Paleoheterodonta: Unionidae). Gene order and mt genome content is examined in a comparative phylogenetic framework for Lampsilis and five other bivalves, representing five families. Mt genome content is shown to vary by gene duplication and loss among taxa and between male and female mitotypes within a species. Although mt gene arrangement is highly variable among bivalves, when optimized on an independently derived phylogenetic hypothesis it allows for the reconstruction of ancestral gene order states and indicates the potential phylogenetic utility of the data. However, the interpretation of reconstructed ancestral gene order states must take in to account both the accuracy of the phylogenetic estimation and the probability of character state change across the topology, such as the presence/absence of atp8 in bivalve linegaes. We discuss what role, if any, doubly uniparental inheritance (DUI) and recombination between sexual mitotypes, may play in influencing gene rearrangement of the mt genome in some bivalve lineages. Key Words:
mitochondrial genome, Unionidae, Bivalvia, gene rearrangement, phylogeny
© 2003 Society for Molecular Biology and Evolution
Original Articles
Complete mtDNA Sequence of the North American Freshwater Mussel, Lampsilis ornata (Unionidae): An Examination of the Evolution and Phylogenetic Utility of Mitochondrial Genome Organization in Bivalvia (Mollusca)
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