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- W2100408063 abstract "Variation in the internal transcribed spacer (ITS) of the rRNA (rrn) operon is increasingly used to infer population-level diversity in bacterial communities. However, intragenomic ITS variation may skew diversity estimates that do not correct for multiple rrn operons within a genome. This study characterizes variation in ITS length, tRNA composition, and intragenomic nucleotide divergence across 155 Bacteria genomes. On average, these genomes encode 4.8 rrn operons (range: 2–15) and contain 2.4 unique ITS length variants (range: 1–12) and 2.8 unique sequence variants (range: 1–12). ITS variation stems primarily from differences in tRNA gene composition, with ITS regions containing tRNA-Ala + tRNA-Ile (48% of sequences), tRNA-Ala or tRNA-Ile (10%), tRNA-Glu (11%), other tRNAs (3%), or no tRNA genes (27%). Intragenomic divergence among paralogous ITS sequences grouped by tRNA composition ranges from 0% to 12.11% (mean: 0.94%). Low divergence values indicate extensive homogenization among ITS copies. In 78% of alignments, divergence is <1%, with 54% showing zero variation and 81% containing at least two identical sequences. ITS homogenization occurs over relatively long sequence tracts, frequently spanning the entire ITS, and is largely independent of the distance (basepairs) between operons. This study underscores the potential contribution of interoperon ITS variation to bacterial microdiversity studies, as well as unequivocally demonstrates the pervasiveness of concerted evolution in the rrn gene family." @default.
- W2100408063 created "2016-06-24" @default.
- W2100408063 creator A5043222288 @default.
- W2100408063 creator A5062592149 @default.
- W2100408063 date "2007-06-12" @default.
- W2100408063 modified "2023-10-14" @default.
- W2100408063 title "Intragenomic Variation and Evolution of the Internal Transcribed Spacer of the rRNA Operon in Bacteria" @default.
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- W2100408063 doi "https://doi.org/10.1007/s00239-006-0235-3" @default.
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