title: Heterogeneous Helicobacter pylori isolates from H. pylori-infected couples in Taiwan.
abstract: Helicobacter pylori strain diversity was investigated in 55 H. pylori seropositive couples in Taiwan in biopsy samples from the antrum and corpus. Two DNA typing methods were used to characterize 90 isolates from 25 couples. In only 1 of the 25 couples was the same strain colonized from both partners. Comparison of isolates from 2 sites in each of 40 patients showed that 9 pairs were distinct but might be related. Peptic ulcer occurred in 77.8% of these 9 patients compared with 29% of 31 patients with the same predominant strain in 2 biopsies (P=.025). Random amplified polymorphic DNA and sequence analyses of 2 closely related isolates from 1 patient support the hypothesis that development of genetic diversity of H. pylori results from horizontal genetic exchange during long-term colonization of mixed bacterial populations.
authors.affiliation: Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.
authors.forename: C H
authors.initials: CH
authors.lastname: Kuo
authors.forename: S K
authors.initials: SK
authors.lastname: Poon
authors.forename: Y C
authors.initials: YC
authors.lastname: Su
authors.forename: R
authors.initials: R
authors.lastname: Su
authors.forename: C S
authors.initials: CS
authors.lastname: Chang
authors.forename: W C
authors.initials: WC
authors.lastname: Wang
mesh_terms: D000328:Adult; D015373:Bacterial Typing Techniques; D004269:DNA, Bacterial / Q000032:analysis; D005260:Female; D014644:Genetic Variation; D016481:Helicobacter Infections / Q000382:microbiology*; D016480:Helicobacter pylori / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D019105:Random Amplified Polymorphic DNA Technique; D017422:Sequence Analysis, DNA; D018454:Spouses; D013624:Taiwan
chemical_list: D004269:DNA, Bacterial