Antimicrob Agents Chemother. 2003 Jul;47(7):2316-8.

Detection of nucleotide variability in rpoB in both rifampin-sensitive and rifampin-resistant strains of Chlamydia trachomatis.

Dreses-Werringloer U, Padubrin I, Köhler L, Hudson AP.

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Department of Immunology and Microbiology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

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.

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PMCID:: PMC161851

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