Microevolution of Helicobacter pylori type IV secretion systems in an ulcer disease patient over a ten-year period.

Abstract:

:Helicobacter pylori cagA and vacA genotypes have been used for almost a decade as stable entities to link the severity of gastritis and ulcer disease. We describe here microevolution of the two genomic islands, cag pathogenicity island (cagPAI; 40 kb) and tfs3 (16 kb) from isolates obtained at inclusion (one subclone) and after a 10-year period (two subclones) from a duodenal ulcer patient. Our results indicate microevolution in cagA, cagE, and cag7 genes of the cagPAI and open reading frames G, P, and L in tfs3, which possibly leads to inactivation or pseudogenization of these genes. Interestingly, no significant reduction in the severity of gastroduodenal pathology was found. These results point to an obvious difficulty in correlating the continuously evolving virulence factors such as the cagPAI genes with disease characteristics that appear to remain stable.

journal_name

J Clin Microbiol

authors

Alvi A,Devi SM,Ahmed I,Hussain MA,Rizwan M,Lamouliatte H,Mégraud F,Ahmed N

doi

10.1128/JCM.01631-07

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

4039-43

issue

12

eissn

0095-1137

issn

1098-660X

pii

JCM.01631-07

journal_volume

45

pub_type

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