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Analysis of antibiotic resistance gene expression in Pseudomonas aeruginosa by quantitative real-time-PCR

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Published in FEMS Microbiology Letters. 2006, vol. 254, no. 2, p. 217-225
Abstract In Pseudomonas aeruginosa many of the clinically relevant resistance mechanisms result from changes in gene expression as exemplified by the Mex drug efflux pumps, the AmpC beta-lactamase and the carbapenem-specific porin OprD. We used quantitative real-time-PCR to analyze the expression of these genes in susceptible and antibiotic-resistant laboratory and clinical strains. In nalB mutants, which overexpress OprM, we observed a four- to eightfold increase in the expression of mexA, mexB, and oprM genes. MexX and mexY genes were induced eight to 12 times in the presence of 2 mg L(-1) tetracycline. The mexC/oprJ and mexE/oprN gene expression levels were increased 30- to 250-fold and 100- to 760-fold in nfxB and nfxC mutants, respectively. We further found that in defined laboratory strains expression levels of ampC and oprD genes paralleled beta-lactamase activity and OprD protein levels, respectively. Our data support the use of quantitative real-time-PCR chain reaction for the analysis of the antimicrobial resistance gene expression in P. aeruginosa.
Keywords Anti-Bacterial Agents/ pharmacologyBacterial Proteins/genetics/ metabolismDrug Resistance, Bacterial/ geneticsGene Expression Regulation, BacterialHumansPorins/genetics/metabolismPseudomonas aeruginosa/ drug effects/genetics/metabolismReverse Transcriptase Polymerase Chain Reaction/ methodsBeta-Lactamases/genetics/metabolism
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PMID: 16445748
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DUMAS, Jean-Luc Claude et al. Analysis of antibiotic resistance gene expression in Pseudomonas aeruginosa by quantitative real-time-PCR. In: FEMS Microbiology Letters, 2006, vol. 254, n° 2, p. 217-225. https://archive-ouverte.unige.ch/unige:7171

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Deposited on : 2010-06-21

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