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A functional polymorphism in ADAR1 gene affects HBsAg seroclearance both spontaneously and interferon induced
Xiaopan Wu1, Weimei Shi, Jia Wu
1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing, China.
The rs4845384 polymorphism in the ADAR1 gene is linked to Hepatitis B surface antigen (HBsAg) seroclearance. This genetic variation influences ADAR1 expression, impacting HBsAg clearance in chronic hepatitis B patients.
Area of Science:
- Genetics
- Hepatology
- Immunology
Background:
- Previous research linked ADAR1 gene polymorphism rs4845384 to HBeAg seroconversion.
- The association between rs4845384 and HBsAg seroclearance remained uninvestigated.
Purpose of the Study:
- To investigate the relationship between the rs4845384 polymorphism and HBsAg seroclearance in chronic hepatitis B (CHB) patients.
Main Methods:
- Conducted two independent case-control studies involving 725 subjects.
- Performed reporter gene assays and quantitative PCR to assess functional significance.
- Analyzed associations with spontaneous and interferon-induced HBsAg seroclearance.
Main Results:
- rs4845384 polymorphism was significantly associated with both spontaneous (P=0.028) and interferon-induced (P=0.013) HBsAg seroclearance.
- Luciferase assays indicated higher expression for rs4845384G constructs compared to rs4845384A constructs.
- Quantitative RT-PCR revealed lower ADAR1 mRNA levels in CHB patients and rs4845384 AA carriers.
Conclusions:
- The rs4845384A allele is functional, downregulating ADAR1 expression and potentially influencing HBsAg seroclearance in CHB patients.
- This polymorphism is a significant genetic factor affecting HBsAg seroclearance outcomes.
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