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A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks
Published on: June 26, 2020
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Reverse genetics approaches for hepatitis E virus and related viruses
Johannes Scholz1, Alexander Falkenhagen1, Claus-Thomas Bock2
1Department Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany.
Current Opinion in Virology
|August 21, 2020
Summary
Reverse genetics systems (RGSs) for hepatitis E virus (HEV) generation have been developed for multiple genotypes. Despite challenges with low recovery and replication rates, RGSs facilitate crucial genetic modifications for HEV research.
Area of Science:
- Virology
- Molecular Biology
- Hepatology
Background:
- Hepatitis E virus (HEV) causes acute and chronic hepatitis in humans.
- Related HEV strains are identified in various animal species.
- Developing tools to study HEV is crucial for understanding and combating the disease.
Purpose of the Study:
- To review the development and application of reverse genetics systems (RGSs) for hepatitis E virus (HEV).
- To highlight the capabilities of RGSs in manipulating the HEV genome.
- To discuss the limitations and potential of current RGSs for HEV research.
Main Methods:
- Development of RGSs for HEV genotypes 1, 3, 4, 5, 7, avian HEV, and rat HEV.
- Generation of infectious HEV from cloned cDNA via cell transfection or animal injection.
- Application of RGSs for site-directed mutagenesis, gene deletions, tag insertions, and chimeric virus generation.
Main Results:
- RGSs have been successfully established for a range of HEV genotypes and species.
- Low virus recovery rates and slow replication remain challenges for most HEV types in cell culture.
- RGSs have proven effective for targeted genetic modifications, including nucleotide changes, fragment deletions, and tag/marker gene insertions.
Conclusions:
- Reverse genetics systems are valuable tools for studying HEV, despite current limitations.
- RGSs enable precise genetic manipulation, aiding in the functional analysis of HEV.
- Further optimization of RGSs is needed to improve virus recovery and replication efficiency for broader HEV research.
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