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Comparative Large-Scale Mitogenomics Evidences Clade-Specific Evolutionary Trends in Mitochondrial DNAs of Bivalvia by Federico Plazzi; Guglielmo Puccio; Marco Passamonti is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Despite the figure of complete bivalve mitochondrial genomes keeps growing, an assessment of the general features of these genomes in a phylogenetic framework is still lacking, despite the fact that bivalve mitochondrial genomes are unusual under different aspects. In this work, we constructed a dataset of one hundred mitochondrial genomes of bivalves to perform the first systematic comparative mitogenomic analysis, developing a phylogenetic background to scaffold the evolutionary history of the class' mitochondrial genomes. Highly conserved domains were identified in all protein coding genes; however, four genes (namely, __atp6__, __nad2__, __nad4L__, and __nad6__) were found to be very divergent for many respects, notwithstanding the overall purifying selection working on those genomes. Moreover, the __atp8__ gene was newly annotated in 20 mitochondrial genomes, where it was previously declared as lacking or only signaled. Supernumerary mitochondrial proteins were compared, but it was possible to find homologies only among strictly related species. The rearrangement rate on the molecule is too high to be used as a phylogenetic marker, but here we demonstrate for the first time in

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Author

Federico Plazzi; Guglielmo Puccio; Marco Passamonti

Publisher

Oxford University Press (OUP)

Published

2016

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)