title: Use of the genotype MTBDR assay for rapid detection of rifampin and isoniazid resistance in Mycobacterium tuberculosis complex isolates.
abstract: A commercially available DNA strip assay (Genotype MTBDR; Hain Lifescience, Nehren, Germany) was evaluated for its ability to detect mutations conferring resistance to rifampin (RMP) and isoniazid (INH) in clinical Mycobacterium tuberculosis complex isolates. A total of 103 multidrug-resistant (MDR; i.e., at least resistant to RMP and INH) and 40 fully susceptible strains isolated in Germany in 2001 in which resistance mutations have been previously defined by DNA sequencing and real-time PCR analysis were investigated. The Genotype MTBDR assay identified 102 of the 103 MDR strains with mutations in the rpoB gene (99%) and 91 strains (88.4%) with mutations in codon 315 of katG. All 40 susceptible strains showed a wild-type MTBDR hybridization pattern. The concordance between the MTBDR assay and the DNA sequencing results was 100%. Compared to conventional drug susceptibility testing, the sensitivity and specificity were 99 and 100% for RMP resistance and 88.4 and 100% for INH resistance, respectively. In conclusion, the MTBDR assay is a rapid and easy-to-perform test for the detection of the most common mutations found in MDR M. tuberculosis strains that can readily be included in a routine laboratory work flow.
authors.affiliation: Forschungszentrum Borstel, National Reference Center for Mycobacteria, Parkallee 18, D-23845 Borstel, Germany. sniemann@fz-borstel.de
authors.forename: Doris
authors.initials: D
authors.lastname: Hillemann
authors.forename: Michael
authors.initials: M
authors.lastname: Weizenegger
authors.forename: Tanja
authors.initials: T
authors.lastname: Kubica
authors.forename: Elvira
authors.initials: E
authors.lastname: Richter
authors.forename: Stefan
authors.initials: S
authors.lastname: Niemann
mesh_terms: D000995:Antitubercular Agents / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics; D002374:Catalase / Q000235:genetics; D024901:Drug Resistance, Multiple, Bacterial; D005838:Genotype; D007538:Isoniazid / Q000494:pharmacology*; D009154:Mutation; D009169:Mycobacterium tuberculosis / Q000145:classification / Q000187:drug effects* / Q000235:genetics; D012293:Rifampin / Q000494:pharmacology*; D017422:Sequence Analysis, DNA
chemical_list: D000995:Antitubercular Agents; D001426:Bacterial Proteins; D002374:Catalase; C480353:katG protein, Mycobacterium tuberculosis; D007538:Isoniazid; D012293:Rifampin