作者: Daniel B. Sloan , Deborah A. Triant , Martin Wu , Douglas R. Taylor
关键词: Genome evolution 、 Plastid 、 Ribosomal protein 、 Peptide sequence 、 Biology 、 Mitochondrial DNA 、 Genetics 、 Ribosome 、 Organelle 、 Nuclear gene
摘要: Many mitochondrial and plastid protein complexes contain subunits that are encoded in different genomes. In animals, nuclear-encoded proteins often exhibit rapid sequence evolution, which has been hypothesized to result from selection for mutations compensate changes interacting mutation-prone animal DNA. To test this hypothesis, we analyzed nuclear genes encoding cytosolic organelle ribosomal flowering plants. The model angiosperm genus Arabidopsis exhibits low mutation rates, typical of most Nevertheless, found (nuclear-encoded) ribosomes have higher amino acid polymorphism divergence than their counterparts ribosomes, suggesting experience relaxed functional constraint. However, the observed difference between was smaller animals could be partially attributed evolution N-terminal organelle-targeting peptides not involved ribosome function. role more directly, used transcriptomic data an (Silene) with highly variable rates genome evolution. We Silene species unusually fast-evolving DNA exhibited increased targeted organelles but those function ribosomes. Overall, these findings support hypothesis selected compensatory proteins. conclude coevolution genomic compartments within eukaryotic cell is important determinant variation