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The large mitochondrial genomes of angiosperms are unusually dynamic because of recombination activities involving repeated sequences. These activities generate subgenomic forms and extensive genomic variation even within the same species. Such changes in genome structure are responsible for the rapid evolution of plant mitochondrial DNA and for the variants associated with cytoplasmic male sterility and abnormal growth phenotypes. Nuclear genes modulate these processes, and over the past decade, several of these genes have been identified. They are involved mainly in pathways of DNA repair by homologous recombination and mismatch repair, which appear to be essential for the faithful replication of the mitogenome. Mutations leading to the loss of any of these activities release error-prone repair pathways, resulting in increased ectopic recombination, genome instability, and heteroplasmy. We review the present state of knowledge of the genes and pathways underlying mitochondrial genome stability.
Annual Review of Plant Biology – Annual Reviews
Published: Apr 28, 2017
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