title: rpoB Gene mutations in rifampin-resistant Mycobacterium tuberculosis identified by polymerase chain reaction single-stranded conformational polymorphism.
abstract: The use of polymerase chain reaction-single-stranded conformational polymorphism (PCR-SSCP) to study rpoB gene mutations in rifampin-resistant (RIFr) Mycobacterium tuberculosis has yielded contradictory results. To determine the sensitivity of this method, we analyzed 35 RIFr strains and 11 rifampin-susceptible (RIFs) strains, using the DNA sequencing of the core region of rpoB for comparison. Of the RIFr, 24 had a PCR-SSCP pattern identical to that of H37Rv; the other 11 had four different patterns. The 11 RIFs had PCR-SSCP patterns identical to that of H37Rv. The sensitivity of the assay was 31.4%; its specificity was 100%. We observed a strong correlation between the degree of resistance and the type of mutation.
authors.affiliation: Laboratory of Clinical Microbiology, Instituto Nacional de Ciencas Médicas y Nutritión Salvador Zubiran, Mexico City, Mexico.
authors.forename: M
authors.initials: M
authors.lastname: Bobadilla-del-Valle
authors.forename: A
authors.initials: A
authors.lastname: Ponce-de-Leon
authors.forename: C
authors.initials: C
authors.lastname: Arenas-Huertero
authors.forename: G
authors.initials: G
authors.lastname: Vargas-Alarcon
authors.forename: M
authors.initials: M
authors.lastname: Kato-Maeda
authors.forename: P M
authors.initials: PM
authors.lastname: Small
authors.forename: P
authors.initials: P
authors.lastname: Couary
authors.forename: G M
authors.initials: GM
authors.lastname: Ruiz-Palacios
authors.forename: J
authors.initials: J
authors.lastname: Sifuentes-Osornio
mesh_terms: D000904:Antibiotics, Antitubercular / Q000494:pharmacology*; D004269:DNA, Bacterial / Q000032:analysis; D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D024881:Drug Resistance, Bacterial; D006801:Humans; D016296:Mutagenesis; D009169:Mycobacterium tuberculosis / Q000187:drug effects / Q000235:genetics* / Q000302:isolation & purification; D016133:Polymerase Chain Reaction / Q000379:methods; D018807:Polymorphism, Single-Stranded Conformational; D012293:Rifampin / Q000494:pharmacology*; D017422:Sequence Analysis, DNA
chemical_list: D000904:Antibiotics, Antitubercular; D004269:DNA, Bacterial; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit; D012293:Rifampin