title: Occurrence of Diverse AbGRI1-Type Genomic Islands in Acinetobacter baumannii Global Clone 2 Isolates from South Korea.
abstract: In this study, we analyzed the frequency of the AbGRI1-type genomic island (GI) and its association with genotypes. We obtained 130 Acinetobacter baumannii isolates causing bloodstream infections from patients in South Korea. Antimicrobial susceptibility testing and multilocus sequence typing were performed. The presence of AbGRI1-type GIs and their structures were determined by sequential PCR and sequencing. Ninety-eight isolates (75.3%) representing 14 sequence types (STs) belonged to clonal complex 208 (CC208), corresponding to global clone 2 (GC2). AbGRI1-type GIs interrupted the comM gene in 107 isolates (82.4%). Four types of GIs were identified: Tn6022 (50 isolates; 46.7%), AbaR4 (23 isolates; 21.5%), Tn6166 (10 isolates; 9.3%), and Tn6166/Tn2006 (24 isolates; 22.4%). In the 50 isolates with Tn6022, Tn2006 or Tn2008B, both containing ISAba1-blaOXA-23, was present in sites other than GIs in 3 or 28 isolates, respectively. In the 10 isolates with Tn6166, Tn2008B was identified in one isolate. AbGRI1-type GIs were identified nearly exclusively in CC208 isolates, with the exception of nine non-CC208 isolates (AbaR4 in eight ST229 isolates and Tn6022 in one ST1244 isolate). Within CC208 isolates, there was evidence of frequent recombination events, in both housekeeping genes and AbGRI1-type GIs, contributing to genotype diversification and the emergence of carbapenem resistance.
authors.affiliation: Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, South Korea.
authors.forename: Dae Hun
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Infectious Diseases, Chonnam National University Medical School, Gwangju, South Korea.
authors.forename: Sook-In
authors.initials: SI
authors.lastname: Jung
authors.affiliation: Division of Infectious Diseases, Daegu Fatima Hospital, Daegu, South Korea.
authors.forename: Ki Tae
authors.initials: KT
authors.lastname: Kwon
authors.affiliation: Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, South Korea ksko@skku.edu.
authors.forename: Kwan Soo
authors.initials: KS
authors.lastname: Ko
mesh_terms: D000151:Acinetobacter Infections / Q000382:microbiology; D040981:Acinetobacter baumannii / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D015780:Carbapenems / Q000494:pharmacology; D004251:DNA Transposable Elements / Q000235:genetics; D044404:Genomic Islands / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008826:Microbial Sensitivity Tests; D058885:Multilocus Sequence Typing; D056910:Republic of Korea; D001618:beta-Lactamases / Q000235:genetics / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D015780:Carbapenems; D004251:DNA Transposable Elements; D001618:beta-Lactamases
keywords: AbaR4; Tn6022; Tn6166; blaOXA-23; carbapenem resistance; resistance island