Rifampin-isoniazid oligonucleotide typing: An alternative format for rapid detection of multidrug-resistant Mycobacterium tuberculosis

• Autores: Hernández Neuta, Iván; Varela, Andrés; Martin, Anandi; Von Groll, Andrea; Jureen, Pontus; López, Beatriz; Imperiale, Belén Rocío; Skenders, Girts; Ritacco, Viviana; Hoffner, Sven; Morcillo, Nora Susana; Palomino, Juan Carlos; Del Portillo, Patricia
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: RAPID; MDR-TB; MOLECULAR; DETECTION
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

A reverse line blot DNA hybridization format for rapid detection of multidrug-resistant tuberculosis was developed. Simultaneous detection of rifampin and isoniazid resistance in clinical isolates of Mycobacterium tuberculosis was based on the same amplification/reverse hybridization principle of the widely used spoligotyping. The test involved probing nine DNA regions that are targets of common drug resistance-associated mutations in the genes rpoB, katG, and inhA. Addition of quaternary amine tetramethyl ammonium chloride to the hybridization buffer promoted multiple hybrid formations at a single annealing temperature irrespective of the different GC contents of probes. The assay was standardized using 20 well-documented strains from the Institute of Tropical Medicine (Belgium) and evaluated blindly in a central laboratory with 100 DNA samples that were obtained from cultured clinical isolates and shipped dried from three other countries. Compared with drug susceptibility testing, both sensitivity and specificity for rifampin resistance detection were 93.0% while for isoniazid the values were 87.7% and 97.7%, respectively. Compared with sequencing and GenoType MTBDRplus methods, sensitivity and specificity reached 96.4% and 95.5% for rifampin and 92.7% and 100% for isoniazid. Altogether, 40/45 (89%) multidrug-resistant isolates were correctly identified. Advantages of this in-house development include versatility, capacity to run up to 41 samples by triplicate in a single run, and reuse of the membrane at least 10 times. These features substantially reduce cost per reaction and make the assay an attractive tool for use in reference laboratories of countries that have a high burden of multidrugresistant tuberculosis but that cannot afford expensive commercial tests because of limited resources.
Fil: Hernández Neuta, Iván. No especifíca;
Fil: Varela, Andrés. No especifíca;
Fil: Martin, Anandi. No especifíca;
Fil: Von Groll, Andrea. No especifíca;
Fil: Jureen, Pontus. No especifíca;
Fil: López, Beatriz. No especifíca;
Fil: Imperiale, Belén Rocío. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Skenders, Girts. No especifíca;
Fil: Ritacco, Viviana. Dirección Nacional de Instituto de Investigación.Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán"; Argentina
Fil: Hoffner, Sven. No especifíca;
Fil: Morcillo, Nora Susana. No especifíca;
Fil: Palomino, Juan Carlos. No especifíca;
Fil: Del Portillo, Patricia. No especifíca;