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The blaOXA-23-associated transposons in the genome of Acinetobacter spp. represent an epidemiological situation of the species encountering carbapenems

 Eun-Jeong Yoon  ;  Jung Ok Kim  ;  Ji Woo Yang  ;  Hwa Su Kim  ;  Kwang Jun Lee  ;  Seok Hoon Jeong  ;  Hyukmin Lee  ;  Kyungwon Lee 
 Journal of Antimicrobial Chemotherapy, Vol.72(10) : 2708-2714, 2017 
Journal Title
 Journal of Antimicrobial Chemotherapy 
Issue Date
Acinetobacter Infections/epidemiology ; Acinetobacter Infections/microbiology* ; Acinetobacter baumannii/drug effects ; Acinetobacter baumannii/genetics* ; Acinetobacter baumannii/pathogenicity ; Bacterial Proteins/genetics* ; Carbapenems/pharmacology* ; DNA Transposable Elements* ; DNA, Bacterial/genetics ; Drug Resistance, Bacterial/genetics ; Electrophoresis, Gel, Pulsed-Field ; Genome, Bacterial* ; Humans ; Microbial Sensitivity Tests ; Polymerase Chain Reaction/methods ; Republic of Korea/epidemiology ; beta-Lactamases/genetics*
Objectives: High rates of carbapenem resistance in the human pathogen Acinetobacter baumannii threaten public health and need to be scrutinized. Methods: A total of 356 A. baumannii and 50 non-baumannii Acinetobacter spp. (NBA) strains collected in 2013 throughout South Korea were studied. The type of blaOXA-23 transposon was determined by PCR mapping and molecular epidemiology was assessed by MLST. Twelve representative strains and two comparative A. baumannii were entirely sequenced by single-molecule real-time sequencing. Results: The carbapenem resistance rate was 88% in A. baumannii, mainly due to blaOXA-23, with five exceptional cases associated with ISAba1-blaOXA-51-like. The blaOXA-23 gene in A. baumannii was carried either by Tn2006 (44%) or Tn2009 (54%), with a few exceptions carried by Tn2008 (1.6%). Of the NBA strains, 14% were resistant to carbapenems, two with blaOXA-58 and five with blaOXA-23 associated with Tn2006. The Tn2006-possessing strains belonged to various STs, whereas Tn2008- and Tn2009-possessing strains were limited to ST208 and ST191, respectively. The three transposons were often multiplied in the chromosome, and the gene copy number and the carbapenem MICs presented linear relationships either very strongly for Tn2008 or moderately for Tn2006 and Tn2009. Conclusions: The dissemination of Tn2006 was facilitated by its capability for intercellular transfer and that of Tn2009 was attributable to successful dissemination of the ST191 bacterial host carrying the transposon. Tn2008 was infrequent because of its insufficient ability to undergo intercellular transfer and the scarce bacterial host A. baumannii ST208. Gene amplification is an adaptive mechanism for bacteria that encounter antimicrobial drugs.
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1. College of Medicine (의과대학) > Dept. of Laboratory Medicine (진단검사의학교실) > 1. Journal Papers
Yonsei Authors
이경원(Lee, Kyungwon) ORCID logo https://orcid.org/0000-0003-3788-2134
이혁민(Lee, Hyuk Min) ORCID logo https://orcid.org/0000-0002-8523-4126
정석훈(Jeong, Seok Hoon) ORCID logo https://orcid.org/0000-0001-9290-897X
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