Affiliation:
1. Ege University Medical Faculty, Department of Clinical Microbiology, Mycobacteriology Laboratory, 35100 Izmir, Turkey
Abstract
ABSTRACT
A novel PCR-based reverse hybridization method Genotype MTBDR assay (Hain Lifescience GmbH, Nehren, Germany) was evaluated for rapid detection of rifampin (RIF) and isoniazid (INH) resistance in Turkish
Mycobacterium tuberculosis
isolates. The Genotype MTBDR assay is designed to detect mutations within the 81-bp hotspot region of
rpoB
and mutations at
katG
codon 315. A total of 41 RIF-resistant
M. tuberculosis
isolates with
rpoB
mutations that were previously tested by the INNO-LiPA Rif.TB kit and also characterized by DNA sequencing were included in the study. Thirty-seven of these isolates were also resistant to INH. RIF resistance was correctly identified in 39 of 41 isolates (95.1%) with the Genotype MTBDR assay probes specific for these mutations. One isolate with a Gln-490-His mutation and another one with a CGG insertion between codons 514 and 515 were identified as RIF sensitive by the Genotype MTBDR assay. While the INNO-LiPA Rif.TB kit was able to determine the CGG insertion between codons 514 and 515, the Gln-490-His mutation outside the 81-bp hotspot region was not detected by the INNO-LiPA Rif.TB kit. These isolates had MICs of ≥32 μg/ml for RIF. The Genotype MTBDR assay also correctly identified 27 of 37 INH-resistant isolates (73%) with mutations in
katG
codon 315. In conclusion, the Genotype MTBDR assay may be useful for the rapid diagnosis of the most common mutations found in multidrug-resistant
M. tuberculosis
strains. However, the test results should always be confirmed with phenotypic methods.
Publisher
American Society for Microbiology
Cited by
67 articles.
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