title: Detection of nucleotide variability in rpoB in both rifampin-sensitive and rifampin-resistant strains of Chlamydia trachomatis.
abstract: A 656-bp PCR fragment from rpoB was sequenced from five rifampin-resistant Chlamydia trachomatis variants selected in vitro from a wild-type parent with a surprising level of genetic variability in this region. Three variants (MIC, 4 microg/ml) showed Ala522-->Val in cluster I (codons 507 to 533), which harbors mutations in most rifampin-resistant bacteria. Two high-level resistance variants (MICs, 64 and 256 microg/ml) showed His526-->Tyr in cluster I with additional genetic variation, some of which resulted in amino acid substitutions. None of the latter was situated in clusters related to rifampin resistance in other bacteria.
authors.affiliation: Department of Immunology and Microbiology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
authors.forename: Ute
authors.initials: U
authors.lastname: Dreses-Werringloer
authors.forename: Ingrid
authors.initials: I
authors.lastname: Padubrin
authors.forename: Lars
authors.initials: L
authors.lastname: Köhler
authors.forename: Alan P
authors.initials: AP
authors.lastname: Hudson
mesh_terms: D000904:Antibiotics, Antitubercular / Q000494:pharmacology*; D002692:Chlamydia trachomatis / Q000187:drug effects* / Q000235:genetics*; D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D024881:Drug Resistance, Bacterial; D005798:Genes, Bacterial; D014644:Genetic Variation; D009154:Mutation; D012293:Rifampin / Q000494:pharmacology*
chemical_list: D000904:Antibiotics, Antitubercular; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit; D012293:Rifampin