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Genetic variations associated with susceptibility to bacteria linked to stomach disorders
Date:5/7/2013

Two genome-wide association studies and a subsequent meta-analysis have found that certain genetic variations are associated with susceptibility to Helicobacter pylori, a bacteria that is a major cause of gastritis and stomach ulcers and is linked to stomach cancer, findings that may help explain some of the observed variation in individual risk for H pylori infection, according to a study in the May 8 issue of JAMA.

"[H pylori] is the major cause of gastritis (80 percent) and gastroduodenal ulcer disease (15 percent-20 percent) and the only bacterial pathogen believed to cause cancer," according to background information in the article. "H pylori prevalence is as high as 90 percent in some developing countries but 10 percent of a given population is never colonized, regardless of exposure. Genetic factors are hypothesized to confer H pylori susceptibility."

Julia Mayerle, M.D., of University Medicine Greifswald, Greifswald, Germany, and colleagues conducted a study to identify genetic loci associated with H pylori seroprevalence. Two independent genome-wide association studies (GWASs) and a subsequent meta-analysis were conducted for anti-H pylori immunoglobulin G (IgG) serology in the Study of Health in Pomerania (SHIP) (recruitment, 1997-2001 [n =3,830]) as well as the Rotterdam Study (RS-I) (recruitment, 1990-1993) and RS-II (recruitment, 2000-2001 [n=7,108]) populations. Whole-blood RNA gene expression profiles were analyzed in RS-III (recruitment, 2006-2008 [n = 762]) and SHIP-TREND (recruitment, 2008-2012 [n=991]), and fecal H pylori antigen in SHIP-TREND (n=961).

Of 10,938 participants, 6,160 (56.3 percent) were seropositive for H pylori. GWAS meta-analysis identified an association between the gene TLR1 and H pylori seroprevalence, "a finding that requires replication in non-white populations," the authors write.

"At this time, the clinica
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Contact: Markus M. Lerch
lerch@uni-greifswald.de
The JAMA Network Journals
Source:Eurekalert

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