TLR2 Arg677Trp but not TLR2 -196 to -174 ins/del and Arg753Gln polymorphism alter the risk of peptic ulcer in north of Iran

Abstract

BackgroundMost polymorphisms that occur in TLR-2 are associated with gastrointestinal disorders such as peptic ulcer disease (PUD). Hence, in current study, association between TLR2-196 to -174 ins/del, Arg753Gln and Arg677Trp polymorphisms and risk of PUD development in north of Iran was evaluated. MethodsThis case-control study included 50 patients with PUD as cases and 50 people without peptic ulcer as control group. Blood and endoscopic biopsies were collected. Helicobacter pylori infection was screened by rapid urease test, specific IgG measurement and specific PCR for glmM gene. Then, TLR2-196 to -174 ins/del polymorphism was assessed by using allele-specific PCR. The Arg753Gln and Arg677Trp polymorphism in TLR2 gene were analyzed by the PCR-restriction fragment length polymorphism (RFLP). ResultsThere was no significant difference in the allele and genotype frequencies of polymorphisms in the TLR2-196 to -174 ins/ins and Arg753Gln genes between controls and patients, respectively. However, an association with increased risk for PUD was observed for polymorphism TLR-2 Arg677Trp (odds ratio [OR] = 7.9; 95% confidence interval [CI] = 0.94–67.5). Further analysis showed that H. pylori infection was associated with a significant difference in genotype and allele frequencies of TLR2-196 to -174 ins/ins and Arg753Gln polymorphism, respectively. Furthermore, there was no association between variant haplotypes and PUD development in H. pylori infected subjects. However, no association was detected between gender and genotypic frequencies of all polymorphisms in TLR2. ConclusionOur findings showed that TLR2 Arg677Trp polymorphism and H. pylori infection may play crucial roles in peptic ulcer development respectively in north of Iran.