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A Protocol for Analyzing Hepatitis C Virus Replication
13:04

A Protocol for Analyzing Hepatitis C Virus Replication

Published on: June 26, 2014

Vps4 and the ESCRT-III complex are required for the release of infectious hepatitis C virus particles

Lynsey Corless1, Colin M Crump, Stephen D C Griffin

  • 1Institute of Molecular and Cellular Biology and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, West Yorkshire, UK.

The Journal of General Virology
|October 16, 2009
PubMed

Insights

Hepatitis C virus (HCV) release depends on the endosomal sorting complex required for transport (ESCRT) pathway. Late ESCRT-III and Vps4 components are crucial for infectious HCV particle production and release from cells.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Hepatitis C virus (HCV) assembly and release mechanisms are not fully understood.
  • Enveloped viruses like HIV-1 use the host's endosomal sorting complex required for transport (ESCRT) machinery for particle formation and release.
  • The role of the ESCRT pathway in HCV egress remains to be elucidated.

Purpose of the Study:

  • To investigate whether the ESCRT pathway is involved in the release of infectious Hepatitis C virus (HCV) particles.
  • To determine which specific components of the ESCRT pathway are essential for HCV egress.

Main Methods:

  • Established a conditional virus-like particle (VLP) assembly system using trans-complementation of an envelope-deleted JFH-1 genome.
  • Utilized dominant-negative mutants of ESCRT-III components and Vps4 to inhibit ESCRT pathway function.
  • Assessed the impact of ESCRT inhibition on infectious particle production, virus genome replication, and intracellular infectious particle accumulation using focus-forming assays.

Main Results:

  • Inhibition of late ESCRT-III components or Vps4 significantly reduced the production of infectious HCV particles.
  • Dominant-negative ESCRT-I or Alix did not affect HCV particle release.
  • ESCRT inhibition did not impact HCV genome replication or the accumulation of intracellular infectious particles, indicating a specific role in release.

Conclusions:

  • HCV requires late components of the ESCRT pathway, specifically ESCRT-III and Vps4, for the efficient release of infectious virus particles.
  • The ESCRT pathway plays a critical role in the egress of Hepatitis C virus from infected host cells.

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