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• W3111285323 abstract "ABSTRACT Although plant mitochondrial genomes typically show low rates of sequence evolution, levels of divergence in certain angiosperm lineages suggest anomalously high mitochondrial mutation rates. However, de novo mutations have never been directly analyzed in such lineages. Recent advances in high-fidelity DNA sequencing technologies have enabled detection of mitochondrial mutations when still present at low heteroplasmic frequencies. To date, these approaches have only been performed on a single plant species ( Arabidopsis thaliana ). Here, we apply a high-fidelity technique (Duplex Sequencing) to multiple angiosperms from the genus Silene , which exhibits extreme heterogeneity in rates of mitochondrial sequence evolution among close relatives. Consistent with phylogenetic evidence, we found that S. latifolia maintains low mitochondrial variant frequencies that are comparable to previous measurements in Arabidopsis. Silene noctiflora also exhibited low variant frequencies despite high levels of historical sequence divergence, which supports other lines of evidence that this species has reverted to lower mitochondrial mutation rates after a past episode of acceleration. In contrast, S. conica showed much higher variant frequencies in mitochondrial (but not in plastid) DNA, consistent with an ongoing bout of elevated mitochondrial mutation rates. Moreover, we found an altered mutational spectrum in S. conica heavily biased towards AT➔GC transitions. We also observed an unusually low number of mitochondrial genome copies per cell in S. conica , potentially pointing to reduced opportunities for homologous recombination to accurately repair mismatches in this species. Overall, these results suggest that historical fluctuations in mutation rates are driving extreme variation in rates of plant mitochondrial sequence evolution." @default.
• W3111285323 created "2020-12-21" @default.
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• W3111285323 date "2020-12-10" @default.
• W3111285323 modified "2023-09-27" @default.
• W3111285323 title "Detecting de novo mitochondrial mutations in angiosperms with highly divergent evolutionary rates" @default.
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• W3111285323 doi "https://doi.org/10.1101/2020.12.09.418582" @default.
• W3111285323 hasPublicationYear "2020" @default.
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