title: Point mutations in the 23S rRNA gene of Helicobacter pylori associated with different levels of clarithromycin resistance.
abstract: Fifty-four of 59 (91.5%) clarithromycin-resistant isolates of Helicobacter pylori from different patients possessed either the A2143G (formerly A2058G) or the A2144G (formerly A2059G) mutation in the gene encoding 23S rRNA. The A2143G mutation was significantly more likely to occur in isolates with MICs exceeding 64 mg/L (65% versus 30% with the A2144G mutation; P = 0.01). The majority (26 of 31; 83.9%) of isolates with the A2143G mutation had MICs exceeding 64 mg/L. Peptic ulcer disease recurred in a substantial proportion of patients infected with H. pylori strains containing either the A2143G or the A2144G mutation.
authors.affiliation: Digestive Diseases, Veterans Affairs Medical Center, Houston, TX 77030, USA. jversal@tiac.net
authors.forename: J
authors.initials: J
authors.lastname: Versalovic
authors.forename: M S
authors.initials: MS
authors.lastname: Osato
authors.forename: K
authors.initials: K
authors.lastname: Spakovsky
authors.forename: M P
authors.initials: MP
authors.lastname: Dore
authors.forename: R
authors.initials: R
authors.lastname: Reddy
authors.forename: G G
authors.initials: GG
authors.lastname: Stone
authors.forename: D
authors.initials: D
authors.lastname: Shortridge
authors.forename: R K
authors.initials: RK
authors.lastname: Flamm
authors.forename: S K
authors.initials: SK
authors.lastname: Tanaka
authors.forename: D Y
authors.initials: DY
authors.lastname: Graham
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D017291:Clarithromycin / Q000494:pharmacology*; D004269:DNA, Bacterial / Q000032:analysis; D004352:Drug Resistance, Microbial / Q000235:genetics; D016480:Helicobacter pylori / Q000187:drug effects / Q000235:genetics*; D006801:Humans; D017354:Point Mutation / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012329:RNA, Bacterial / Q000235:genetics*; D012338:RNA, Ribosomal, 23S / Q000235:genetics*
chemical_list: D000900:Anti-Bacterial Agents; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012338:RNA, Ribosomal, 23S; D017291:Clarithromycin