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      vacA genotypes of Helicobacter pylori in relation to cagA status and clinical outcomes in Iranian populations.

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          Abstract

          Mosaicism in vacA alleles with two distinct families of vacA signal sequences (s1 and s2) and two distinct families of middle region alleles (m1 and m2) has been reported. Research suggests that the vacA s1 genotype is closely associated with duodenal ulcer disease and with high cytotoxin production. The aims of this study were to evaluate the role of vacA genotyping with respect to gastric inflammation and injury, and clinical presentation in Iranian populations. Genomic DNA of biopsy specimens from patients with gastritis, peptic ulcer disease (PUD), or gastric cancer (GC) were characterized based on ureC (glmM), cagA, and vacA genotyping by using polymerase chain reaction. Of 167 patients including 33 with PUDs, 129 with non-ulcer dyspepsia (NUD), and 5 with GC, 96 (57.5%) cases were infected by Helicobacter pylori. Among these patients, H. pylori were isolated from 19 (57.7%) PUD patients, 74 (68.7%) NUD patients, and 3 (60%) GC patients. The cagA was detected in 76% of H. pylori-positive cases. The vacA s1-m2 genotype was the most prevalent in 7/19 PUD (37%) and 30/74 NUD (40.5%) patients with H. pylori infection. The prevalence of vacA s2-m1 (8%) was high in Iranian isolates. A significant association was not found between H. pylori genotypes and clinical outcomes. The vacA genotypes and cagA status were not useful markers for gastroduodenal diseases in Tehran, Iran.

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          Author and article information

          Journal
          Jpn J Infect Dis
          Japanese journal of infectious diseases
          1344-6304
          1344-6304
          Jul 2008
          : 61
          : 4
          Affiliations
          [1 ] Research Center for Gastroenterology and Liver Diseases in Shaheed Beheshti University, M. C., Tehran, Iran. f_jaafari580@yahoo.com.
          Article
          NIHMS502782
          3719049
          18653971
          80a8fc09-c61b-4fce-af88-f64a1039d569
          History

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