Details
- Autor(en) / Beteiligte
- Titel
- The population structure of Acinetobacter baumannii: expanding multiresistant clones from an ancestral susceptible genetic pool
- Ist Teil von
- PloS one, 2010-04, Vol.5 (4), p.e10034-e10034
- Ort / Verlag
- United States: Public Library of Science
- Erscheinungsjahr
- 2010
- Link zum Volltext
- Quelle
- Free E-Journal (出版社公開部分のみ）
- Beschreibungen/Notizen
- Outbreaks of hospital infections caused by multidrug resistant Acinetobacter baumannii strains are of increasing concern worldwide. Although it has been reported that particular outbreak strains are geographically widespread, little is known about the diversity and phylogenetic relatedness of A. baumannii clonal groups. Sequencing of internal portions of seven housekeeping genes (total 2,976 nt) was performed in 154 A. baumannii strains covering the breadth of known diversity and including representatives of previously recognized international clones, and in 19 representatives of other Acinetobacter species. Restricted amounts of diversity and a star-like phylogeny reveal that A. baumannii is a genetically compact species that suffered a severe bottleneck in the recent past, possibly linked to a restricted ecological niche. A. baumannii is neatly demarcated from its closest relative (genomic species 13TU) and other Acinetobacter species. Multilocus sequence typing analysis demonstrated that the previously recognized international clones I to III correspond to three clonal complexes, each made of a central, predominant genotype and few single locus variants, a hallmark of recent clonal expansion. Whereas antimicrobial resistance was almost universal among isolates of these and a novel international clone (ST15), isolates of the other genotypes were mostly susceptible. This dichotomy indicates that antimicrobial resistance is a major selective advantage that drives the ongoing rapid clonal expansion of these highly problematic agents of nosocomial infections.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1932-6203eISSN: 1932-6203DOI: 10.1371/journal.pone.0010034Titel-ID: cdi_plos_journals_1289444667
- Format
- –
- Schlagworte
- Acinetobacter, Acinetobacter baumannii, Acinetobacter baumannii - genetics, Analysis, Antiinfectives and antibacterials, Antimicrobial agents, Antimicrobial resistance, Biodiversity, Clone Cells, Cloning, Cross Infection, Drug resistance in microorganisms, Drug Resistance, Multiple, Bacterial - genetics, Ecological niches, Enterobacteriaceae, Gene sequencing, Genetics, Genotypes, Health aspects, Hospital patients, Hospitals, Infectious Diseases/Epidemiology and Control of Infectious Diseases, Infectious Diseases/Nosocomial and Healthcare-Associated Infections, Laboratories, Microbial drug resistance, Microbiology/Microbial Evolution and Genomics, Multiculturalism & pluralism, Multidrug resistance, Multilocus sequence typing, Nosocomial infection, Nosocomial infections, Outbreaks, Phylogenetics, Phylogeny, Plesiomonas shigelloides, Population, Population structure, Public health, Selection, Genetic, Species, Species diversity, Strains (organisms)