Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Expression analysis of 10 efflux pump genes in multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis clinical isolates

Wed May 29 12:10:12 2024

(2019) Expression analysis of 10 efflux pump genes in multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis clinical isolates. Journal of Global Antimicrobial Resistance. pp. 201-208. ISSN 2213-7165

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Objectives: Active extrusion of antituberculosis drugs via efflux pumps (EPs) has been suggested as contributing to drug resistance in Mycobacterium tuberculosis. This study was conducted to determine the role of 10 drug efflux transporters in the development of drug resistance in a series of clinical M. tuberculosis isolates. Methods: A total of 31 clinical M. tuberculosis isolates without drug exposure 21 multi/extensively drug-resistant (M/XDR-TB) and 10 drug-susceptible isolates were studied. The expression profile of 10 EP genes, including efpA, mmr, stp, drrA, drrB, mmpL7, Rv1250, Rv1634, Rv2994 and Rv1258c, was investigated against the H37Rv standard strain by quantitative reverse transcription PCR (RT-qPCR). Results: Among the 21 M/XDR-TB isolates, 10 showed significantly increased levels of gene expression (>4-fold) for at least one of the studied EPs. Moreover, of the isolates with overexpressed genes, three and seven lacked genetic alterations in the surveyed regions of the rpoB + katG + inhA and katG + inhA genes, respectively. Whilst no elevation was observed in the expression of mmr, Rv1250, Rv1634 and Rv1258c genes in any of the isolates, drrA, stp and drrB were found to be the most commonly overexpressed, being overexpressed in seven, five and three isolates, respectively. Decreased minimum inhibitory concentrations (MICs) of rifampicin, but not isoniazid, were observed in the presence of the efflux pump inhibitor carbonyl cyanide 3-chlorophenylhydrazone (CCCP). Conclusion: Overexpression of EP genes can contribute to the emergence of a MDR phenotype in M. tuberculosis. Inhibition of EPs may provide a promising strategy for improving tuberculosis treatment outcomes in patients infected with M/XDR-TB isolates. (C) 2019 International Society for Chemotherapy of Infection and Cancer. Published by Elsevier Ltd. All rights reserved.

Item Type: Article
Kardan-Yamchi, J.UNSPECIFIED
Keywords: Mycobacterium tuberculosis Efflux pump RT-qPCR Drug resistance Expression CCCP catalase-peroxidase gene isoniazid resistance molecular-cloning inhibitors mutations strains p55 Infectious Diseases Pharmacology & Pharmacy
Page Range: pp. 201-208
Journal or Publication Title: Journal of Global Antimicrobial Resistance
Journal Index: ISI
Volume: 17
Identification Number:
ISSN: 2213-7165
Depositing User: مهندس مهدی شریفی

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