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The CRISPR/Cas9 System Facilitates Clearance of the Intrahepatic HBV Templates In Vivo

Su-Ru Lin1, Hung-Chih Yang2, Yi-Ting Kuo1

  • 1Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.

Molecular Therapy. Nucleic Acids
|August 20, 2014
PubMed

Insights

The CRISPR/Cas9 system effectively targets and cleaves hepatitis B virus (HBV) DNA, offering a potential strategy to disrupt the persistent viral cccDNA and combat chronic hepatitis B (CHB). This novel approach shows promise for HBV eradication.

Area of Science:

  • Molecular Biology
  • Virology
  • Gene Editing

Background:

  • Persistent hepatitis B virus (HBV) covalently closed circular DNA (cccDNA) hinders chronic hepatitis B (CHB) eradication with current therapies.
  • Novel strategies targeting cccDNA are essential for achieving a cure for CHB.

Purpose of the Study:

  • To investigate the efficacy of the clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 system in cleaving HBV genomes.
  • To evaluate the potential of CRISPR/Cas9 as a therapeutic strategy for eradicating persistent HBV infection.

Main Methods:

  • Designed eight guide RNAs (gRNAs) targeting HBV genotype A.
  • Utilized the CRISPR/Cas9 system with HBV-specific gRNAs in Huh-7 cells transfected with an HBV-expression vector.
  • Employed a hydrodynamics-HBV persistence mouse model to assess in vivo efficacy.

Main Results:

  • CRISPR/Cas9 significantly reduced HBV core and surface protein production in vitro.
  • Two effective gRNAs were identified, with one targeting a conserved HBV sequence showing efficacy across different genotypes.
  • In vivo studies demonstrated cleavage of intrahepatic HBV DNA and reduction in serum surface antigen levels.

Conclusions:

  • The CRISPR/Cas9 system effectively disrupts HBV-expressing templates both in vitro and in vivo.
  • This gene-editing technology holds significant potential for the eradication of persistent HBV infection.

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