Abstract
A unique mode of mitochondrial DNA inheritance, designated doubly-uniparental inheritance (DUI), occurs in three bivalve subclasses (Pteriomorpha: Mytiloida, Palaeoheterodonta: Unionoida, Heterodonta: Veneroida), indicating that DUI may be a widespread phenomenon among bivalves. In mytiloids, breakdown of this pattern of inheritance (gender-switching) is observed in natural populations and in a phylogenetic context. In contrast, gender-switching has not occurred during the evolutionary history of unionoids. Here we present sequences for the male (M) and female (F) mitotypes from an additional 8 species of Unionoida. Consistent with previous observations, the M and F mitotypes of all species form reciprocally monophyletic clades supporting the hypothesis of taxon-specific rates of gender-switching. Coinciding with the absence of gender-switching is an ≈185 codon extension of the cytochrome c oxidase II (MTCO2) locus in the male genome. The extension is present in all 12 unionoid species examined, including a representative of the family Margaritiferidae, indicating that this protein-coding polymorphism originated ≥ 200 MYBP. Although the extension is well conserved in length among 11 of the 12 species, one taxon has a significantly shortened extension. Lastly, examination of the rates and patterns of substitution indicate that the extension is evolving under relaxed purging selection, a pattern inconsistent with the conserved nature of MTCO2 or any cytochrome c oxidase locus.
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We thank Dennis Hedgecock and four anonymous reviewers for comments on the manuscript.
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[Reviewing Editor: Dr. J. William Ballard]
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Curole, J.P., Kocher, T.D. Evolution of a Unique Mitotype-Specific Protein-Coding Extension of the Cytochrome c Oxidase II Gene in Freshwater Mussels (Bivalvia: Unionoida). J Mol Evol 61, 381–389 (2005). https://doi.org/10.1007/s00239-004-0192-7
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DOI: https://doi.org/10.1007/s00239-004-0192-7