Abstract
A simple and reliable technique was developed for differentiating Helicobacter pylori strains by restriction fragment length polymorphism analysis of polymerase chain reaction (PCR)-amplified DNAs. Oligonucleotide primer pairs developed to the urease, 48-kDa stress protein (htrA), and 26-kDa antigen-encoding genes were used to amplify fragments of the appropriate size from crude boiled cell preparations. The PCR-amplified products were digested with Sau3A, HaeIII, MspI, AluI, MluI, HinfI, and XbaI restriction endonucleases. Restriction fragment length polymorphisms were particularly evident within the urease and htrA genes and were easily detected by Sau3A, HaeIII, MspI, and AluI restriction endonuclease analysis. Double digestion of these separately amplified products or restriction analysis of multiple PCR-amplified fragments was found to discriminate 17 of 17 (100%) H. pylori strains which had unique genomic DNA fingerprints. Results of an investigation of multiple isolate sets obtained from patients before and after therapy was consistent with the hypothesis that treatment failures were due to the persistence of the same strain but did not discount the possibility that the patients were reinfected with a strain shared by family members or close contacts. The results indicate that the PCR-restriction endonuclease analysis method can be applied directly to biopsy samples, has the potential to fingerprint H. pylori isolates rapidly, and may permit detailed epidemiological investigations on the transmission of this important pathogen.
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