Abstract:
:Within plastid-bearing species, the mutation rate of the plastid genome is often assumed to be greater than that of the mitochondrial genome. This assumption is based on early, pioneering studies of land plant molecular evolution, which uncovered higher rates of synonymous substitution in plastid versus mitochondrial DNAs. However, much of the plastid-containing eukaryotic diversity falls outside of land plants, and the patterns of plastid DNA evolution for embryophytes do not necessarily reflect those of other groups. Recent analyses of plastid and mitochondrial substitution rates in diverse lineages have uncovered very different trends than those recorded for land plants. Here, I explore these new data and argue that for many protists the plastid mutation rate is lower than that of the mitochondrion, including groups with primary or secondary plastids as well as nonphotosynthetic algae. These findings have far-reaching implications for how we view plastid genomes and how their sequences are used for evolutionary analyses, and might ultimately reflect a general tendency toward more efficient DNA repair mechanisms in plastids than in mitochondria.
journal_name
Genome Biol Evoljournal_title
Genome biology and evolutionauthors
Smith DRdoi
10.1093/gbe/evv069subject
Has Abstractpub_date
2015-04-13 00:00:00pages
1227-34issue
5issn
1759-6653pii
evv069journal_volume
7pub_type
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journal_title:Genome biology and evolution
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pub_type: 杂志文章
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journal_title:Genome biology and evolution
pub_type: 杂志文章
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更新日期:2014-06-19 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Genome biology and evolution
pub_type: 信件
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pub_type: 杂志文章
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journal_title:Genome biology and evolution
pub_type: 杂志文章
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journal_title:Genome biology and evolution
pub_type: 杂志文章
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pub_type: 杂志文章
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