Analysis of integrons and associated gene cassettes of metallo-{beta}-lactamase-positive Pseudomonas aeruginosa in Malaysia

Khosravi , Y.; Tay , S.T.; Vadivelu , J. (2011) Analysis of integrons and associated gene cassettes of metallo-{beta}-lactamase-positive Pseudomonas aeruginosa in Malaysia. Journal of Medical Microbiology, 60 (pt7). pp. 988-1092. ISSN 0022-2615

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Abstract

In this study, 90 non-replicate imipenem-resistant Pseudomonas aeruginosa (IRPA) Malaysian isolates collected between October 2005 and March 2008 were subjected to a screening test for detection of the integron and the gene cassette. Class 1 integrons were detected in 54 IRPA clinical isolates, whilst three isolates contained class 2 integrons. Analysis of the gene cassettes associated with the class 1 integrons showed the detection of accC1 in isolates carrying bla(IMP-7) and aacA7 in isolates carrying bla(VIM-2). aadA6 was detected in two isolates carrying bla(IMP-4). Using random amplification of polymorphic DNA analysis, 14 PCR fingerprint patterns were generated from the 32 isolates carrying metallo-β-lactamase (MBL) genes (35.5 %), whilst 20 patterns were generated from the 58 non-MBL gene isolates (64.4 %). Based on the differences in the fingerprinting patterns, two clusters (A and B) were identified among the MBL-producing isolates. Cluster A comprised 18 isolates (56 %) carrying the bla(VIM) gene, whereas cluster B comprised 14 (44 %) isolates carrying the bla(IMP) gene. The non-MBL isolates were divided into clusters C and D. Cluster C comprised 22 non-MBL isolates harbouring class 1 integrons, whilst cluster D consisted of three isolates carrying class 2 integrons. These findings suggest that the class 1 integron is widespread among P. aeruginosa isolated in Malaysia and that characterization of cassette arrays of integrons will be a useful epidemiological tool to study the evolution of multidrug resistance and the dissemination of antibiotic resistance genes.

Item Type: Article
Creators:
  1. Khosravi , Y.(University of Malaya)
  2. Tay , S.T.(University of Malaya)
  3. Vadivelu , J.(University of Malaya)
Journal or Publication Title: Journal of Medical Microbiology
Additional Information: Department of Medical Microbiology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
Uncontrolled Keywords: Imipenem-resistant Pseudomonas Aeruginosa (IRPA)
Subjects: R Medicine
Divisions: Faculty of Medicine
Depositing User: Mr. Faizal Hamzah
Date Deposited: 05 Aug 2011 08:28
Last Modified: 05 Aug 2011 08:28
URI: http://eprints.um.edu.my/id/eprint/1937

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