Determination of correlation between principal genotypes of Helicobacter pylori according to cagPAI components and vacA genotypes and clinical out come in patients suffering from active chronic gastritis and gastric adenocarcinoma from Iran and Turkey

Abstract

Objective(s): Helicobacter pylori are gastric infectious agents that colonizes majority of the world's population. Genetic diversity among the virulence factors of bacterium like cytotoxin associated gene Pathogenicity Island (cagPAI) and vacuolating cytotoxinA (vacA) could have a modifying result on the pathogenic potential of the infecting strain. This study aimed to analyse which genes can be recommended as doubtless related virulence factors for H. pylori associated active chronic gastritis and stomach adenocarcinoma in Iranian and Turkish population. Material and methods: We tend to targeted on some cag PAI components and vacA gene subtypes based on correlations shown in some previous studies. So as to realize our goal, formalin fixed Paraffin Embedded (FFPE) tissues obtained from Iranian and Turkish patients. The prevalence of the cagPAI and vacA genotypes were studied in H. pylori positive samples by using Polymerase Chain Reaction (PCR) technique and specific primers. Results: From all of 320 patients, H. pylori were detected in 28.43% of patients. We tend to found that vacAs1, vacAm2 and cagA genes with mean prevalence of 82.41%, 71.42% and 69.23% were dominant in both of Iranian and Turkish patients. Conclusion: Finally in Turkish and Iranian population the genes that were studied, was homogeneous and there's no important variations in bacterial genetic and with the exception of H. pylori infection different factors like host genetic and nourishment play a crucial role within the formation of gastric cancer. However it's attainable that if statistical population will increase, the cagA gene association with cancer are going to be meaningful.