ArticleProceedings of the National Academy of Sciences of the United States of America2008
Genome-wide analyses of Geraniaceae plastid DNA reveal unprecedented patterns of increased nucleotide substitutions.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 103 papers.
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103 citing papers in PubMed, 199 citations in OpenAlex.
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43 more citing papers are in PubMed but not listed here.
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4 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Angiosperm plastid genomes are generally conserved in gene content and order with rates of nucleotide substitutions for protein-coding genes lower than for nuclear protein-coding genes. A few groups have experienced genomic change, and extreme changes in gene content and order are found within the flowering plant family Geraniaceae. The complete plastid genome sequence of Pelargonium X hortorum (Geraniaceae) reveals the largest and most rearranged plastid genome identified to date. Highly elevated rates of sequence evolution in Geraniaceae mitochondrial genomes have been reported, but rates in Geraniaceae plastid genomes have not been characterized. Analysis of nucleotide substitution rates for 72 plastid genes for 47 angiosperm taxa, including nine Geraniaceae, show that values of dN are highly accelerated in ribosomal protein and RNA polymerase genes throughout the family. Furthermore, dN/dS is significantly elevated in the same two classes of plastid genes as well as in ATPase genes. A relatively high dN/dS ratio could be interpreted as evidence of two phenomena, namely positive or relaxed selection, neither of which is consistent with our current understanding of plastid genome evolution in photosynthetic plants. These analyses are the first to use protein-coding sequences from complete plastid genomes to characterize rates and patterns of sequence evolution for a broad sampling of photosynthetic angiosperms, and they reveal unprecedented accumulation of nucleotide substitutions in Geraniaceae. To explain these remarkable substitution patterns in the highly rearranged Geraniaceae plastid genomes, we propose a model of aberrant DNA repair coupled with altered gene expression.
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