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Emergence and Distribution of Plasmids Bearing the blaOXA-51-like gene with an upstream ISAba1 in carbapenem-resistant Acinetobacter baumannii isolates in Taiwan.

Abstract：

:The bla(OXA-51)-like gene with an upstream ISAba1 (ISAba1-bla(OXA-51)-like gene) was originally found on the chromosomes of carbapenem-resistant or -susceptible Acinetobacter baumannii isolates. However, a plasmid-borne ISAba1-bla(OXA-51)-like gene has recently been identified in Acinetobacter genomic species 13TU and several A. baumannii isolates in Taiwan, and all of the isolates are carbapenem resistant. This study aimed to characterize the plasmids bearing the ISAba1-bla(OXA-51)-like gene and their significance in A. baumannii. Among the 117 ISAba1-bla(OXA-51)-like-harboring isolates collected from 10 hospitals in Taiwan, 58 isolates (49.6%) from 24 clones had the genes located on plasmids that likely originated from a common progenitor. Among the 58 isolates, four had additional copy of the ISAba1-bla(OXA-51)-like gene on their chromosomes. Based on the analysis of these four isolates, the plasmid-located ISAba1-bla(OXA-51)-like gene appeared to be acquired via one-ended transposition (Tn6080). The isolates with a plasmid bearing the ISAba1-bla(OXA-51)-like gene had higher rates of resistance to imipenem (98% versus 46.6%; P < 0.001) and meropenem (98% versus 69%; P = 0.019) than those with the genes chromosomally encoded, which is most likely due to increased gene dosage provided by the higher copy number of associated plasmids. Transformation with a recombinant plasmid harboring only the ISAba1-bla(OXA-51)-like gene was enough to confer a high level of carbapenem resistance to A. baumannii, eliminating the possible contribution of other factors on the original plasmids. This study demonstrated that the carbapenem resistance-associated plasmids carrying the ISAba1-bla(OXA-51)-like gene are widespread in A. baumannii strains in Taiwan.

journal_name

Antimicrob Agents Chemother

journal_title

Antimicrobial agents and chemotherapy

authors

Chen TL,Lee YT,Kuo SC,Hsueh PR,Chang FY,Siu LK,Ko WC,Fung CP

doi

10.1128/AAC.00764-10

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

4575-81

issue

eissn

0066-4804

issn

1098-6596

pii

AAC.00764-10

journal_volume

pub_type

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Emergence and Distribution of Plasmids Bearing the blaOXA-51-like gene with an upstream ISAba1 in carbapenem-resistant Acinetobacter baumannii isolates in Taiwan.