The impact of recombination on dN/dS within recently emerged bacterial clones.

Abstract:

:The development of next-generation sequencing platforms is set to reveal an unprecedented level of detail on short-term molecular evolutionary processes in bacteria. Here we re-analyse genome-wide single nucleotide polymorphism (SNP) datasets for recently emerged clones of methicillin resistant Staphylococcus aureus (MRSA) and Clostridium difficile. We note a highly significant enrichment of synonymous SNPs in those genes which have been affected by recombination, i.e. those genes on mobile elements designated "non-core" (in the case of S. aureus), or those core genes which have been affected by homologous replacements (S. aureus and C. difficile). This observation suggests that the previously documented decrease in dN/dS over time in bacteria applies not only to genomes of differing levels of divergence overall, but also to horizontally acquired genes of differing levels of divergence within a single genome. We also consider the role of increased drift acting on recently emerged, highly specialised clones, and the impact of recombination on selection at linked sites. This work has implications for a wide range of genomic analyses.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Castillo-Ramírez S,Harris SR,Holden MT,He M,Parkhill J,Bentley SD,Feil EJ

doi

10.1371/journal.ppat.1002129

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

e1002129

issue

7

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-10-00149

journal_volume

7

pub_type

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