Real-time PCR for single-nucleotide polymorphism detection in the 16S rRNA gene as an indicator for extensive drug resistance in Mycobacterium tuberculosis

• Published in: Journal of antimicrobial chemotherapy 2011-06, Vol.66 (6), p.1243-1246
• Main Authors: BLASCHITZ, Marion, HASANACEVIC, Dzenita, HUFNAGL, Peter, HASENBERGER, Petra, PECAVAR, Verena, MEIDLINGER, Liliya, KONRAD, Miriam, ALLERBERGER, Franz, INDRA, Alexander
• Format: Article
• Language: English
• Subjects: Amikacin; Amikacin - pharmacology; Antibiotics. Antiinfectious agents. Antiparasitic agents; Antimicrobial agents; Antitubercular Agents - pharmacology; Bacteria; Biological and medical sciences; Capreomycin; Capreomycin - pharmacology; Drug resistance; Drug Resistance, Multiple, Bacterial; Drugs; Genotype & phenotype; Humans; Kanamycin; Medical sciences; Melting; Microbial Sensitivity Tests - methods; Mycobacterium tuberculosis; Mycobacterium tuberculosis - drug effects; Mycobacterium tuberculosis - genetics; Pharmacology. Drug treatments; Polymerase chain reaction; Polymerase Chain Reaction - methods; Polymorphism; Polymorphism, Single Nucleotide; RNA, Ribosomal, 16S - genetics; rRNA 16S; Sensitivity and Specificity; Single-nucleotide polymorphism; Time Factors; Tuberculosis
• ISSN: 0305-7453; 1460-2091
• DOI: 10.1093/jac/dkr070

A real-time PCR screening system was established for rapid detection of single-nucleotide polymorphisms (SNPs) at positions 1401, 1402 and 1484 of the 16S rRNA gene of Mycobacterium tuberculosis leading to resistance to amikacin, kanamycin and capreomycin. Resistances to the respective drugs may indicate the presence of an extensively drug-resistant (XDR) strain of M. tuberculosis. Fifty-seven M. tuberculosis isolates that tested phenotypically susceptible or resistant to amikacin, capreomycin or both were subjected to 1401-2/1484 real-time PCR to screen for SNPs in the respective rrs region. 1401-2 and 1484 wild-type and mutant M. tuberculosis strains displayed distinct melting peaks. Of the cross-resistant strains, 86.7% displayed A1401G SNPs, 76.9% of amikacin-resistant strains did not display rrs SNPs and one capreomycin-resistant strain showed a C1402T SNP. Phenotypic drug susceptibility testing takes several weeks, but with the 1401-2/1484 real-time PCR a preliminary diagnosis can be made within a few hours. SNPs in the rrs region are not exclusively involved in the development of resistances to amikacin and capreomycin. However, 80.0% of XDR-tuberculosis samples tested were detected with the real-time PCR screening assay of the present study.