title: Resistance levels and rpoB gene mutations among in vitro-selected rifampin-resistant Mycobacterium tuberculosis mutants.
abstract: The distribution and resistance levels of 189 in vitro-selected rifampin-resistant Mycobacterium tuberculosis mutants of Beijing and other genotypes were determined. Apart from a higher amount of codon 522 point mutations and large deletions, a spread of mutations similar to that reported for clinical isolates was seen. Most mutations were correlated with high-level resistance; a lower level, or a MIC of <16 mg/liter, was associated with codon 522 mutations. Multiple mutations were detected in two Beijing mutants.
authors.affiliation: Department of Bacteriology, Swedish Institute for Infectious Disease Control, S-171 82 Solna, Sweden.
authors.forename: Emma
authors.initials: E
authors.lastname: Huitric
authors.forename: Jim
authors.initials: J
authors.lastname: Werngren
authors.forename: Pontus
authors.initials: P
authors.lastname: Juréen
authors.forename: Sven
authors.initials: S
authors.lastname: Hoffner
mesh_terms: D019943:Amino Acid Substitution; D000904:Antibiotics, Antitubercular / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D012321:DNA-Directed RNA Polymerases; D004352:Drug Resistance, Microbial / Q000235:genetics; D006801:Humans; D066298:In Vitro Techniques; D008826:Microbial Sensitivity Tests; D009154:Mutation; D009169:Mycobacterium tuberculosis / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification; D017354:Point Mutation; D012293:Rifampin / Q000494:pharmacology*; D017384:Sequence Deletion
chemical_list: D000904:Antibiotics, Antitubercular; D001426:Bacterial Proteins; C505805:rpoB protein, Mycobacterium tuberculosis; D012321:DNA-Directed RNA Polymerases; D012293:Rifampin