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Year : 2015  |  Volume : 33  |  Issue : 2  |  Page : 277-281

Detection of mutations in mtrR gene in quinolone resistant strains of N.gonorrhoeae isolated from India

1 Department of Microbiology and Clinical Pathology, National AIDS Research Institute, Bhosari, Pune, Maharastra, India
2 Regional STD Teaching Training and Research Centre, Vardhman Mahavir Medical College and Safdarjang Hospital, New Delhi, India
3 Department of Molecular Virology, National AIDS Research Institute, Bhosari, Pune, Maharashtra, India

Correspondence Address:
S V Kulkarni
Department of Microbiology and Clinical Pathology, National AIDS Research Institute, Bhosari, Pune, Maharastra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0255-0857.154878

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Background and Objectives: Emergence of multi-drug resistant Neisseria gonorrhoeae resulting from new genetic mutation is a serious threat in controlling gonorrhea. This study was undertaken to identify and characterise mutations in the mtrR genes in N.gonorrhoeae isolates resistant to six different antibiotics in the quinolone group. Materials and Methods: The Minimum inhibitory concentrations (MIC) of five quinolones for 64 N.gonorrhoeae isolates isolated during Jan 2007-Jun 2009 were determined by E-test method. Mutations in MtrR loci were examined by deoxyribonucleic acid (DNA) sequencing. Results: The proportion of N.gonorrhoeae strains resistant to anti-microbials was 98.4% for norfloxacin and ofloxacin, 96.8% for enoxacin and ciprofloxacin, 95.3% for lomefloxacin. Thirty-one (48.4%) strains showed mutation (single/multiple) in mtrR gene. Ten different mutations were observed and Gly-45 → Asp, Tyr-105 → His being the most common observed mutation. Conclusion: This is the first report from India on quinolone resistance mutations in MtrRCDE efflux system in N.gonorrhoeae. In conclusion, the high level of resistance to quinolone and single or multiple mutations in mtrR gene could limit the drug choices for gonorrhoea.


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2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

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