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Related Experiment Video

Updated: Oct 11, 2025

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
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DNA Engineering and Hepatitis B Virus Replication.

Chun-Yang Gan1, Jing Cui1, Wen-Lu Zhang1

  • 1Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, China.

Frontiers in Microbiology
|December 3, 2021
PubMed
Summary
This summary is machine-generated.

Researchers identified optimal regions in the hepatitis B virus (HBV) genome for engineering. Exogenous gene insertion can disrupt relaxed circular DNA (RC DNA) formation, but sequence optimization can restore it, aiding recombinant HBV development.

Keywords:
DNA sequence optimizationRNA splicinghepatitis B virusrecombinationreplication

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetic Engineering

Background:

  • Recombinant DNA technology is crucial for human hepatitis B virus (HBV) research, enabling reporter virus and gene transfer vector production.
  • Existing methods for engineering the HBV genome lack systematic analysis, hindering the development of optimized recombinant viruses.

Purpose of the Study:

  • To systematically identify suitable regions within the HBV genome for exogenous gene insertion.
  • To evaluate the impact of engineered genes on HBV replication and relaxed circular DNA (RC DNA) formation.
  • To provide a basis for constructing and optimizing recombinant HBV vectors.

Main Methods:

  • A 500-bp deletion strategy was employed to scan the HBV genome, identifying two engineering-suitable regions (nt 99-1,198 and nt 2,118-2,814).
  • Ten exogenous genes were inserted into these regions, fused to hepatitis B core protein (HBC) and hepatitis B surface protein (HBS) open reading frames via T2A peptide.
  • HBV DNA and RNA assays were performed to assess the impact of gene insertion on RC DNA formation, with sequence optimization tested for the UnaG gene.

Main Results:

  • Nine out of ten genes inserted in region 99-1,198 and five out of ten in region 2,118-2,814 supported RC DNA formation.
  • Exogenous gene insertion appeared to abrogate RC DNA formation, potentially by inducing adverse secondary DNA structures.
  • Sequence optimization of the UnaG gene based on the HBC sequence successfully rescued RC DNA formation, validating the hypothesis.

Conclusions:

  • The study identified specific HBV genome regions amenable to exogenous gene engineering.
  • Exogenous gene insertion can interfere with RC DNA formation, but sequence optimization offers a strategy to overcome this.
  • Findings provide a valuable method for recombinant HBV construction and suggest DNA sequence plays a role in HBV evolution.