Impact of TLR9 gene Polymorphism on Severity of Helicobacter pylori Infection and Its Association with Virulence genes

Marei, Yara E.; Mansour, Bassam; Ahmed, Samar A.; Nassar, Hassnaa M.; Nasr El Dien, Eman F.; Hamady, Asmaa B.

doi:10.21608/ejmm.2024.328759

Impact of TLR9 gene Polymorphism on Severity of Helicobacter pylori Infection and Its Association with Virulence genes

Document Type : New and original researches in the field of Microbiology.

Authors

¹ Medical Microbiology and Immunology Department, Faculty of Medicine, Suez Canal University, Ismailia, Egypt

² Infection and endemic disease Department, Faculty of medicine, Suez Canal University, Ismailia, Egypt

³ Pathology Department, Faculty of Medicine, Suez Canal University, Ismailia, Egypt

⁴ Clinical Pathology Department, Faculty of Medicine, Suez Canal University, Ismailia, Egypt

⁵ Internal Medicine Department, Faculty of Medicine, Suez Canal University, Ismailia, Egypt

10.21608/ejmm.2024.328759

Abstract

Background: Helicobacter pylori colonizes stomach epithelium in the majority of people worldwide. It disturbs the local mucosa's homeostasis in the stomach and causes many pathological disorders, such as chronic gastritis, peptic ulcers and gastric cancer. Objective: This study aimed to determine the relation between different TLR9 gene polymorphism genotypes and the risk and severity of H. pylori‑related gastric diseases and determine possible associations of these genotypes with H. pylori virulence genes. Methodology: 136 adult dyspeptic patients who had gastric symptoms attended Gastroenterology Department at Suez Canal University Hospitals were incorporated in this study. Three stomach biopsies were obtained from each patient. The glmM gene was amplified using PCR for confirmation of H. pylori infection. Virulence genes were identified by PCR. Using PCR-RFLP, the genotypes of TLR9 gene polymorphism were analyzed. Results: The most prevalent genes were hsp60, vacA s1/ s2 and vacA m1/m2 detected in 93.7 % of H. pylori isolates, followed by cagA (54.2%). Frequencies of CC, TC, and TT genotypes were 41.7 %, 38.5 %, and 19.8 %, respectively in infected patients compared to 10.4 %, 54.2 %, and 35.4 %, respectively in the control group. Conclusion: This study reported a significant association between TLR9 SNP and H. pylori‑related diseases and showed that the patients who had the CC genotype may have higher risk of developing severe gastritis. There may be a synergistic effect between the CC genotype and H. pylori carrying hsp60 and vacA s1/m1 genes leading to severe gastritis.

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