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Updated: Feb 21, 2026

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
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Replicative efficiency and pathogenicity of hepatitis B virus e-minus precore variant.

Yu-Mei Wen1, Zhang-Mei Ma1, G Tu1

  • 1Department of Molecular Virology Shanghai Medical University, Shanghai, ChinaDepartment of Pathology, Shanghai Medical University, Shanghai, China.

Journal of Gastroenterology and Hepatology
|October 5, 2017
PubMed
Summary

Hepatitis B virus (HBV) precore variant A1896 shows reduced replication. Higher anti-hepatitis B virus e antigen (HBe) titres suggest it may inhibit HBV replication or select for the A1896 variant.

Keywords:
duck hepatitis B virushepatitis B viruspathogenicityprecore mutantreplicative efficiency

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Area of Science:

  • Virology
  • Hepatology
  • Molecular Biology

Background:

  • Hepatitis B virus (HBV) precore variants can influence viral replication and disease progression.
  • The A1896 variant is associated with altered viral kinetics and immune response.
  • Understanding the replicative efficiency and pathogenicity of HBV variants is crucial for therapeutic strategies.

Purpose of the Study:

  • To investigate the replicative efficiency and pathogenicity of the hepatitis B virus precore variant A1896.
  • To determine the role of anti-hepatitis B virus e antigen (HBe) titre in the context of wild-type HBV, A1896 variant, and dual infections.
  • To assess the impact of specific mutations in the duck hepatitis B virus (DHBV) precore region on viral replication and pathogenesis.

Main Methods:

  • Studied anti-HBe titres in patients with wild-type HBV, A1896 variant, and dual infections.
  • Constructed three site-directed mutants in the DHBV precore region.
  • Infected ducks with mutant DHBV strains to evaluate replication and pathogenicity.

Main Results:

  • Higher anti-HBe titres were observed in patients with no viral replication and in those coinfected with wild-type HBV and the A1896 variant.
  • A frameshift mutation in the DHBV encapsidation signal region abolished replication.
  • Mutations in the precore initiation codon or generating a termination codon decreased DHBV replication, with enhanced pathological changes in liver tissues.

Conclusions:

  • Anti-HBe may inhibit HBV replication or act as selective pressure for the A1896 variant.
  • Specific mutations in the precore region significantly impair viral replication, as demonstrated in the DHBV model.
  • The HBV A1896 variant exhibits reduced replicative efficiency and potentially increased pathogenicity, highlighting the importance of precore region integrity.