title: Molecular typing of Helicobacter pylori isolates from asymptomatic, ulcer and gastritis patients by urease gene polymorphism.
abstract: The gastric-adapted bacterium Helicobacter pylori plays an important role in gastritis and ulcer disease, but no phenotypic typing scheme presently exists for this organism. With a view to the development of genotypic typing, we have compared isolates of H. pylori from gastritis or ulcer patients with those from subjects exhibiting no disease. Variation was analysed at the urease genes, ureA and ureCD, by employing PCR-generated probes in genomic Southern blot hybridizations. Whilst ureA restriction fragments provided a fourfold subgrouping of strains, ureCD fragments were considerably more discriminatory. Twenty-four combined ureACD profiles were generated with Hind III, subdividing the 64 strains into 11 types and 13 single profiles. The most prevalent profile (UI) was found in 33% of strains, almost all from gastritis or ulcer patients. On the other hand strains isolated from asymptomatic individuals had the most diverse ureACD profiles. A key finding from this set of isolates was that strains of H. pylori associated with general gastroduodenal disease were genetically more homogeneous than strains carried by people without disease symptoms.
authors.affiliation: National Collection of Type Cultures, Central Public Health Laboratory, London.
authors.forename: M
authors.initials: M
authors.lastname: Desai
authors.forename: D
authors.initials: D
authors.lastname: Linton
authors.forename: R J
authors.initials: RJ
authors.lastname: Owen
authors.forename: J
authors.initials: J
authors.lastname: Stanley
mesh_terms: D015373:Bacterial Typing Techniques; D001483:Base Sequence; D015139:Blotting, Southern; D016000:Cluster Analysis; D017931:DNA Primers / Q000737:chemistry; D004269:DNA, Bacterial / Q000032:analysis / Q000737:chemistry; D005756:Gastritis / Q000382:microbiology*; D005787:Gene Frequency; D005798:Genes, Bacterial; D014644:Genetic Variation; D005838:Genotype; D016481:Helicobacter Infections / Q000382:microbiology*; D016480:Helicobacter pylori / Q000145:classification* / Q000201:enzymology / Q000235:genetics; D006801:Humans; D008969:Molecular Sequence Data; D005810:Multigene Family; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D013276:Stomach Ulcer / Q000382:microbiology*; D014510:Urease / Q000235:genetics*
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D014510:Urease