title: Differentiation between isolates of Helicobacter pylori by PCR-RFLP analysis of urease A and B genes and comparison with ribosomal RNA gene patterns.
abstract: Genetic diversity amongst 21 human gastric isolates of Helicobacter pylori was investigated by polymerase chain reaction amplification and HaeIII digest (restriction fragment length polymorphism) analysis of an internal 2.4-kb segment of the urease A and urease B genes. H. pylori from 11 independent individuals yielded nine distinct restriction fragment patterns but only one pattern was common to H. pylori from two individuals. By contrast, multiple isolate sets of H. pylori from two patients each had common urease gene patterns. Most strains with the same urease gene patterns were distinguishable in their ribosomal RNA gene patterns. The study demonstrated diversity amongst H. pylori and established that PCR analysis of urease genes provided a novel method of identifying isolates. The profiles were reproducible and convenient to obtain and analyse, and were almost as discriminatory as HaeIII ribopatterns.
authors.affiliation: National Collection of Type Cultures, Central Public Health Laboratory, London, UK.
authors.forename: C R
authors.initials: CR
authors.lastname: Lopez
authors.forename: R J
authors.initials: RJ
authors.lastname: Owen
authors.forename: M
authors.initials: M
authors.lastname: Desai
mesh_terms: D015373:Bacterial Typing Techniques; D001483:Base Sequence; D004269:DNA, Bacterial / Q000032:analysis; D015252:Deoxyribonucleases, Type II Site-Specific; D014644:Genetic Variation; D016480:Helicobacter pylori / Q000145:classification* / Q000201:enzymology / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012335:RNA, Ribosomal / Q000032:analysis; D013270:Stomach / Q000382:microbiology; D014510:Urease / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D012335:RNA, Ribosomal; D015252:Deoxyribonucleases, Type II Site-Specific; C024403:GGCC-specific type II deoxyribonucleases; D014510:Urease