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

AUTOR(ES)

Nikolayevsky, V.

FONTE

American Society for Microbiology

RESUMO

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.

Documentos Relacionados

• Use of Real-Time PCR and Fluorimetry for Rapid Detection of Rifampin and Isoniazid Resistance-Associated Mutations in Mycobacterium tuberculosis
• Rapid Direct Detection of Multiple Rifampin and Isoniazid Resistance Mutations in Mycobacterium tuberculosis in Respiratory Samples by Real-Time PCR
• Rapid Detection of Isoniazid and Rifampin Resistance Mutations in Mycobacterium tuberculosis Complex from Cultures or Smear-Positive Sputa by Use of Molecular Beacons
• Evaluation of the Invader Assay, a Linear Signal Amplification Method, for Identification of Mutations Associated with Resistance to Rifampin and Isoniazid in Mycobacterium tuberculosis
• Rapid Detection of Rifampin Resistance in Mycobacterium tuberculosis Isolates by Heteroduplex Analysis and Determination of Rifamycin Cross-Resistance in Rifampin-Resistant Isolates