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• W2891748801 abstract "For 30 years, it has been clear that angiosperm mitochondrial genomes evolve rapidly in sequence arrangement (i.e., synteny), yet absolute rates of rearrangement have not been measured in any plant group, nor is it known how much these rates vary. To investigate these issues, we sequenced and reconstructed the rearrangement history of seven mitochondrial genomes in Monsonia (Geraniaceae). We show that rearrangements (occurring mostly as inversions) not only take place at generally high rates in these genomes but also uncover significant variation in rearrangement rates. For example, the hyperactive mitochondrial genome of Monsonia ciliata has accumulated at least 30 rearrangements over the last million years, whereas the branch leading to M. ciliata and its sister species has sustained rearrangement at a rate that is at least ten times lower. Furthermore, our analysis of published data shows that rates of mitochondrial genome rearrangement in seed plants vary by at least 600-fold. We find that sites of rearrangement are highly preferentially located in very close proximity to repeated sequences in Monsonia. This provides strong support for the hypothesis that rearrangement in angiosperm mitochondrial genomes occurs largely through repeat-mediated recombination. Because there is little variation in the amount of repeat sequence among Monsonia genomes, the variable rates of rearrangement in Monsonia probably reflect variable rates of mitochondrial recombination itself. Finally, we show that mitochondrial synonymous substitutions occur in a clock-like manner in Monsonia; rates of mitochondrial substitutions and rearrangements are therefore highly uncoupled in this group." @default.
• W2891748801 created "2018-09-27" @default.
• W2891748801 creator A5034391850 @default.
• W2891748801 creator A5052241438 @default.
• W2891748801 creator A5071816915 @default.
• W2891748801 creator A5085912469 @default.
• W2891748801 date "2018-09-07" @default.
• W2891748801 modified "2023-10-03" @default.
• W2891748801 title "High and Variable Rates of Repeat-Mediated Mitochondrial Genome Rearrangement in a Genus of Plants" @default.
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