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Real-Time Polymerase Chain Reaction-Based Detection and Quantification of Hepatitis B Virus DNA
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Toll-like receptor 3 polymorphism and its association with hepatitis B virus infection in Saudi Arabian patients

Ahmed Al-Qahtani1, Mohammed Al-Ahdal, Ayman Abdo

  • 1Department of Infection and Immunity, Research Center, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia.

Journal of Medical Virology
|July 25, 2012
PubMed

Insights

Toll-like receptor 3 (TLR3) gene single nucleotide polymorphisms (SNPs) may influence Hepatitis B virus (HBV) infection susceptibility. One specific TLR3 SNP, rs1879026, and a GCGA haplotype were significantly associated with HBV infection in Saudi patients.

Area of Science:

  • Immunogenetics
  • Hepatology
  • Virology

Background:

  • Hepatitis B virus (HBV) causes chronic liver disease, including cirrhosis and hepatocellular carcinoma (HCC).
  • Toll-like receptor 3 (TLR3) is crucial for innate immunity, recognizing viral double-stranded RNA (dsRNA).
  • Genetic variations in TLR3, specifically single nucleotide polymorphisms (SNPs), may impact susceptibility to viral infections like HBV.

Purpose of the Study:

  • To investigate the distribution of nine TLR3 gene SNPs in Saudi Arabian patients with HBV infection.
  • To determine the association of these TLR3 SNPs and their haplotypes with HBV infection, cirrhosis, and HCC development.

Main Methods:

  • Genotyping of nine TLR3 SNPs (including rs5743311, rs5743312, rs1879026, rs5743313, rs5743314, rs5743315, rs111611328, rs78726532, and a novel SNP) in 707 HBV-infected patients and 600 healthy controls.
  • Statistical analysis to assess the association of individual SNPs and haplotypes with HBV infection and disease progression.
  • Haplotype analysis was performed for specific combinations of SNPs.

Main Results:

  • A significant difference in the distribution of the TLR3 SNP rs1879026 (G/T) was observed between HBV carriers and controls (P=0.0480; OR=0.809).
  • No significant association was found for the other eight SNPs with HBV infection or progression to cirrhosis and HCC.
  • Haplotype analysis identified a significant association between the GCGA haplotype (comprising rs1879026, rs5743313, rs5743314, and rs5743315) and HBV infection in the Saudi population.

Conclusions:

  • Genetic variations in the TLR3 gene, particularly the rs1879026 SNP and the GCGA haplotype, may play a role in determining susceptibility to HBV infection among Saudi individuals.
  • These findings highlight the potential influence of innate immune system gene polymorphisms on viral hepatitis outcomes.

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