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Journal of Clinical Microbiology, October 2004, p. 4498-4502, Vol. 42, No. 10
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.10.4498-4502.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Detection of Mutations Associated with Isoniazid and Rifampin Resistance in Mycobacterium tuberculosis Isolates from Samara Region, Russian Federation

V. Nikolayevsky,1 T. Brown,1 Y. Balabanova,1,2 M. Ruddy,1 I. Fedorin,2 and F. Drobniewski1*

Health Protection Agency Mycobacterium Reference Unit and Department of Infectious Diseases, King's College Hospital (Dulwich), London, United Kingdom,1 Samara Tuberculosis Service, Samara City, Samara, Russian Federation2

Received 30 January 2004/ Returned for modification 29 March 2004/ Accepted 29 June 2004

High incidence rates of isoniazid-, rifampin-, and multiple-drug-resistant tuberculosis have been reported in countries of the former Soviet Union (FSU). Genotypic (unlike phenotypic) drug resistance assays do not require viable cultures but require accurate knowledge of both the target gene and the mutations associated with resistance. For these assays to be clinically useful, they must be able to detect the range of mutations seen in isolates from the population of tuberculosis patients to which they are applied. Two novel macroarrays were applied to detect mutations associated with rifampin (rpoB) and isoniazid (katG and inhA) resistance. In a sample of 233 isolates from patients in Samara, central Russia, 46.5% of isolates possessed mutations in both the rpoB and the katG (or inhA) genes. Combined results from the macroarrays demonstrated concordance in 95.4 and 90.4% of phenotypically defined rifampin- and isoniazid-resistant isolates, respectively. The contribution of different mutations to resistance was comparable to that reported previously for non-FSU countries, with 90% of rifampin-resistant isolates and 93% of isoniazid resistant isolates due to rpoB531 and katG315 mutations, respectively. The percentage of phenotypically resistant rifampin isolates with no mutations in the rpoB codons 509 to 536 was 4.2%, which was similar to previous reports. Novel macroarrays offer a rapid, accurate, and relatively cheap system for the identification of rifampin-, isoniazid-, and multiple-drug-resistant Mycobacterium tuberculosis isolates.

* Corresponding author. Mailing address: HPA Mycobacterium Reference Unit and Department of Infectious Diseases, King's College Hospital (Dulwich), East Dulwich Grove, London SE22 8QF, United Kingdom. Phone: 208 693 1312. Fax: 207 346 6477. E-mail: francis.drobniewski{at}kcl.ac.uk.

Journal of Clinical Microbiology, October 2004, p. 4498-4502, Vol. 42, No. 10
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.10.4498-4502.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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