title: Detection of high-level tetracycline resistance in clinical isolates of Helicobacter pylori using PCR-RFLP.
abstract: Tetracycline is one of four antibiotics commonly used for the treatment of Helicobacter pylori infection, but its effectiveness is decreasing as the incidence of tetracycline resistance is increasing. In five Brazilian tetracycline-resistant (Tet(R)) H. pylori isolates, high-level tetracycline resistance is mediated by the triple-base-pair substitution AGA(926-928)-->TTC in both 16S rRNA genes, as was previously observed in two independent high-level Tet(R) H. pylori strains. A polymerase chain reaction-based restriction fragment length polymorphism (PCR-RFLP) assay was developed for the detection of the AGA(926-928)-->TTC substitution, and confirmed the presence of the aforementioned triple-base-pair substitution in all five Brazilian Tet(R) isolates. This PCR-RFLP-based approach distinguishes the high-level Tet(R) isolates from low-level Tet(R) and Tet(S) H. pylori strains and thus allows the direct detection of Tet(R) H. pylori isolates.
authors.affiliation: Clinical Pharmacology and Gastroenterology Unit, São Francisco University Medical School, Bragança Paulista, SP, Brazil.
authors.forename: Marcelo L
authors.initials: ML
authors.lastname: Ribeiro
authors.forename: Monique M
authors.initials: MM
authors.lastname: Gerrits
authors.forename: Yune H B
authors.initials: YH
authors.lastname: Benvengo
authors.forename: Marco
authors.initials: M
authors.lastname: Berning
authors.forename: Anita P O
authors.initials: AP
authors.lastname: Godoy
authors.forename: Ernst J
authors.initials: EJ
authors.lastname: Kuipers
authors.forename: Sergio
authors.initials: S
authors.lastname: Mendonça
authors.forename: Arnoud H M
authors.initials: AH
authors.lastname: van Vliet
authors.forename: José
authors.initials: J
authors.lastname: Pedrazzoli
authors.forename: Johannes G
authors.initials: JG
authors.lastname: Kusters
mesh_terms: D000483:Alleles; D019943:Amino Acid Substitution / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D020459:Genes, rRNA; D016481:Helicobacter Infections / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects* / Q000235:genetics*; D006801:Humans; D009154:Mutation; D012150:Polymorphism, Restriction Fragment Length; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D012097:Repressor Proteins; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013752:Tetracycline / Q000378:metabolism / Q000494:pharmacology; D013753:Tetracycline Resistance / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D012097:Repressor Proteins; C034811:tetracycline resistance-encoding transposon repressor protein; D013752:Tetracycline