Clinical outcome after infection with Helicobacter pylori does not appear to be reliably predicted by the presence of any of the genes of the cag pathogenicity island.

Abstract:

BACKGROUND:The development of clinical disease after infection with Helicobacter pylori has been reported to be associated with expression of the cagA gene. Recently, it has been shown that cagA is part of a multigene locus, described as the cag pathogenicity island (PAI). The role of this region in determining clinical outcome remains to be established. AIMS:To investigate whether the presence of cagA is always associated with the presence of the complete cag PAI and to evaluate the distribution of selected cag genes in 73 H pylori strains isolated from patients in France. METHODS:Clinical strains of H pylori were screened for selected genes of the cag PAI by polymerase chain reaction and colony hybridisation. RESULTS:Of 64 strains that harboured the cagA gene, 57 (89%) also contained the entire cag PAI. The entire cag PAI was found in 85% (48/56) and 53% (9/17) of duodenal ulcer and non-ulcer dyspepsia isolates, respectively. Eight strains had deletions within the cag PAI, including deletion of the cagA gene in one isolate; the deletions were not associated with the insertion sequence IS605. Of eight strains lacking the cag PAI, four were isolated from patients with duodenal ulcer. CONCLUSION:The cag PAI is not a uniform, conserved entity. Although the presence of the cag PAI is highly associated with duodenal ulcer, the clinical outcome of infection with H pylori is not reliably predicted by any gene of the cag PAI.

journal_name

Gut

journal_title

Gut

authors

Jenks PJ,Mégraud F,Labigne A

doi

10.1136/gut.43.6.752

subject

Has Abstract

pub_date

1998-12-01 00:00:00

pages

752-8

issue

6

eissn

0017-5749

issn

1468-3288

journal_volume

43

pub_type

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