[Relationship between hot spot mutation in hepatitis B virus basic core promotor and HBeAg status]

Area of Science:

• Hepatology
• Virology
• Molecular Biology

Context:

• Hepatitis B virus (HBV) infection is a global health concern.
• The role of specific HBV mutations in disease progression and serological markers requires further elucidation.
• Asymptomatic HBV carriers represent a significant population for studying viral evolution and its clinical implications.

Purpose:

• To investigate the association between hot spot mutations in the HBV basic core promoter (BCP) at nt1762 and nt1764 and the HBeAg status in asymptomatic HBV carriers.
• To determine the prevalence of these BCP mutations in HBeAg-negative versus HBeAg-positive individuals.
• To explore the co-occurrence of BCP mutations with mutations in the HBV Pre-C region (nt1896).

Summary:

• Mismatched PCR and restriction enzyme analysis were used to detect HBV BCP hot spot mutations (nt1762 and nt1764) in 90 asymptomatic HBV carriers.
• Hot spot mutations were found in 43.3% of HBeAg-negative carriers (26/60), frequently associated with nt1896 mutations (20/26).
• In contrast, only 10% of HBeAg-positive carriers (3/30) exhibited these BCP mutations, with a statistically significant difference observed between the HBeAg-negative and HBeAg-positive groups, even when excluding Pre-C mutations.

Impact:

• The findings suggest that hot spot mutations in the HBV BCP are prevalent in HBeAg-negative carriers and may contribute to the HBeAg-negative phenotype.
• This research identifies a potential novel mechanism underlying HBeAg-negative hepatitis B virus infection.
• Understanding these mutations can inform diagnostic strategies and our comprehension of HBV pathogenesis.