Evidence of Selection upon Genomic GC-Content in Bacteria

Meyer, Axel; Hildebrand, Falk; Eyre-Walker, Adam

Evidence of Selection upon Genomic GC-Content in Bacteria

Dateien

Meyer_Hildebrand.pdfGröße: 198.85 KBDownloads: 215

Datum

2010

Autor:innen

Meyer, Axel

Hildebrand, Falk

Eyre-Walker, Adam

Herausgeber:innen

Nachman, Michael W.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

PloS genetics. 2010, 9(6), pp. 1-9. eISSN 1553-7404. Available under: doi: 10.1371/journal.pgen.1001107

Zusammenfassung

The genomic GC-content of bacteria varies dramatically, from less than 20% to more than 70%. This variation is generally ascribed to differences in the pattern of mutation between bacteria. Here we test this hypothesis by examining patterns of synonymous polymorphism using datasets from 149 bacterial species. We find a large excess of synonymous GC→AT mutations over AT→GC mutations segregating in all but the most AT-rich bacteria, across a broad range of phylogenetically diverse species. We show that the excess of GC→AT mutations is inconsistent with mutation bias, since it would imply that most GC-rich bacteria are declining in GC-content; such a pattern would be unsustainable. We also show that the patterns are probably not due to translational selection or biased gene conversion, because optimal codons tend to be AT-rich, and the excess of GC→AT SNPs is observed in datasets with no evidence of recombination. We therefore conclude that there is selection to increase synonymous GC-content in many species. Since synonymous GC-content is highly correlated to genomic GC-content, we further conclude that there is selection on genomic base composition in many bacteria.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Zitieren

ISO 690

MEYER, Axel, Falk HILDEBRAND, Adam EYRE-WALKER, NACHMAN, Michael W., ed., 2010. Evidence of Selection upon Genomic GC-Content in Bacteria. In: PloS genetics. 2010, 9(6), pp. 1-9. eISSN 1553-7404. Available under: doi: 10.1371/journal.pgen.1001107

BibTex

@article{Meyer2010Evide-13526,
  year={2010},
  doi={10.1371/journal.pgen.1001107},
  title={Evidence of Selection upon Genomic GC-Content in Bacteria},
  number={6},
  volume={9},
  journal={PloS genetics},
  pages={1--9},
  author={Meyer, Axel and Hildebrand, Falk and Eyre-Walker, Adam}
}

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Universitätsbibliographie

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