Typing of Helicobacter pylori vacA gene and detection of cagA gene by PCR and reverse hybridization.

Abstract:

:The present report describes an analysis of two virulence genes of Helicobacter pylori. Parts of the cagA gene, as well as parts from the signal (s) and middle (m) regions of the mosaic vacA gene, were amplified with biotin-labelled PCR primers and the products were subsequently analyzed by a single-step reverse hybridization line probe assay (LiPA). This assay comprises a strip containing multiple specific probes for the vacA s region (sla, slb, and s2 alleles), the vacA m region (ml and m2 alleles), and the cagA gene. A total of 103 H. pylori-positive materials, including cultured isolates, gastric biopsy specimens, and surgical specimens from patients living in Portugal (n = 55) and The Netherlands (n = 48) were tested by the PCR-LiPA. cagA was detected in 84 and 73% of the Portuguese and Dutch patients, respectively. vacA typing results, as determined by reverse hybridization, were completely concordant with those of sequence analysis. Most Portuguese patients (72%) contained type slb, whereas most Dutch patients (61%) contained type sla (P < 0.001). The method is also very effective at detecting the presence of multiple genotypes in a single biopsy specimen. The prevalence of multiple strains in Portuguese patient samples was significantly higher (29%) than that in Dutch patient samples (8%) (P = 0.001). There was a significant association between the presence of ulcers or gastric carcinoma and the presence of vacA type sl (sla or slb; P = 0.008) and cagA (P = 0.003) genes.

journal_name

J Clin Microbiol

authors

van Doorn LJ,Figueiredo C,Rossau R,Jannes G,van Asbroek M,Sousa JC,Carneiro F,Quint WG

doi

10.1128/JCM.36.5.1271-1276.1998

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

1271-6

issue

5

eissn

0095-1137

issn

1098-660X

journal_volume

36

pub_type

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