期刊
GENOME BIOLOGY AND EVOLUTION
卷 11, 期 7, 页码 1780-1796出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evz119
关键词
population structure; recombination; whole-genome phylogenetics; microbial evolution; accessory genome; exoU; exoS
资金
- Feinberg School of Medicine
- Center for Genetic Medicine
- Feinberg's Department of Biochemistry and Molecular Genetics
- National Institutes of Health [K24 AI104831, R01 AI053674, R01 AI118257, U19 AI135964]
- Cystic Fibrosis Foundation [WHITAK16P0]
- American Cancer Society [MRSG-13-220-01 - MPC]
- MRC [MR/R015600/1] Funding Source: UKRI
The diversification of microbial populations may be driven by many factors including adaptation to distinct ecological niches and barriers to recombination. We examined the population structure of the bacterial pathogen Pseudomonas aeruginosa by analyzing whole-genome sequences of 739 isolates from diverse sources. We confirmed that the population structure of P. aeruginosa consists of two major groups (referred to as Groups A and B) and at least two minor groups (Groups C1 and C2). Evidence for frequent intragroup but limited intergroup recombination in the core genome was observed, consistent with sexual isolation of the groups. Likewise, accessory genome analysis demonstrated more gene flow within Groups A and B than between these groups, and a few accessory genomic elements were nearly specific to one or the other group. In particular, the exoS gene was highly overrepresented in Group A compared with Group B isolates (99.4% vs. 1.1%) and the exoU gene was highly overrepresented in Group B compared with Group A isolates (95.2% vs. 1.8%). The exoS and exoU genes encode effector proteins secreted by the P. aeruginosa type III secretion system. Together these results suggest that the major P. aeruginosa groups defined in part by the exoS and exoU genes are divergent from each other, and that these groups are genetically isolated and may be ecologically distinct. Although both groups were globally distributed and caused human infections, certain groups predominated in some clinical contexts.
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