Evidence for Compensatory Evolution of Ribosomal Proteins in Response to Rapid Divergence of Mitochondrial rRNA

TitleEvidence for Compensatory Evolution of Ribosomal Proteins in Response to Rapid Divergence of Mitochondrial rRNA
Publication TypeJournal Article
Year of Publication2013
AuthorsBarreto FS, Burton RS
JournalMolecular Biology and Evolution
Volume30
Pagination310-314
Date Published2013/02
Abstract

Rapid evolution of mitochondrial DNA (mtDNA) places intrinsic selective pressures on many nuclear genes involved in mitochondrial functions. Mitochondrial ribosomes, for example, are composed of mtDNA-encoded ribosomal RNAs (rRNAs) and a set of more than 60 nuclear-encoded ribosomal proteins (mRP) distinct from the cytosolic RPs (cRP). We hypothesized that the rapid divergence of mt-rRNA would result in rapid evolution of mRPs relative to cRPs, which respond to slowly evolving nuclear-encoded rRNA. In comparisons of rates of nonsynonymous and synonymous substitutions between a pair of divergent populations of the copepod Tigriopus californicus, we found that mRPs showed elevated levels of amino acid changes relative to cRPs. This pattern was equally strong at the interspecific level, between three pairs of sister species (Nasonia vitripennis vs. N. longicornis, Drosophila melanogaster vs. D. simulans, and Saccharomyces cerevisae vs. S. paradoxus). This high rate of mRP evolution may result in intergenomic incompatibilities between taxonomic lineages, and such incompatibilities could lead to dysfunction of mitochondrial ribosomes and the loss of fitness observed among interpopulation hybrids in T. californicus and interspecific hybrids in other species.

DOI10.1093/molbev/mss228
Short TitleMol. Biol. Evol.
Integrated Research Themes: 
Student Publication: 
No