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Updated: Mar 6, 2026
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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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EIF4H and YBX1 are essential host factors for hepatitis E virus replication and pathogenesis
Xiaohui Ju1, Lin Dong1, Tianxu Liu2
1Center for Infection Biology, School of Basic Medical Sciences, Tsinghua University, Beijing 100084, China.
Summary
Researchers identified Eukaryotic Translation Initiation Factor 4H (EIF4H) and Y-Box Binding Protein 1 (YBX1) as crucial host factors for Hepatitis E virus (HEV) replication. Targeting these factors could lead to new antiviral therapies for HEV infection.
Area of Science:
- Virology
- Hepatology
- Molecular Biology
Background:
- Hepatitis E virus (HEV) causes significant global acute viral hepatitis, with limited antiviral treatments available.
- Understanding host factors is critical for developing effective HEV therapies.
- Current research lacks detailed knowledge of host cell machinery essential for HEV replication.
Purpose of the Study:
- To identify and characterize essential host factors required for HEV replication and pathogenesis.
- To investigate the specific roles of identified host factors in the HEV life cycle.
- To explore the potential of these host factors as targets for novel antiviral interventions.
Main Methods:
- Genome-wide CRISPR/Cas9 knockout screens were employed using an HEV replicon system.
- HEV replication and infection were assessed in various cell models, including hepatocellular carcinoma and iPSC-derived hepatocytes.
- Viral loads, shedding, and liver pathology were evaluated in EIF4H and YBX1 knockout rat models.
Main Results:
- Eukaryotic Translation Initiation Factor 4H (EIF4H) and Y-Box Binding Protein 1 (YBX1) were identified as essential host factors for HEV replication across multiple genotypes.
- Knockout of EIF4H or YBX1 significantly impaired HEV replication and production, with no impact on other viruses like HBV, HCV, or SARS-CoV-2.
- EIF4H interacts with HEV ORF1, affecting the replication complex, while YBX1 is crucial for ORF1 proteolytic processing.
- EIF4H and YBX1 knockout rats demonstrated resistance to HEV-C1 infection, with reduced viral shedding and liver pathology.
Conclusions:
- EIF4H and YBX1 are indispensable host factors for HEV infection and pathogenesis.
- These factors exhibit HEV-specific roles, making them promising targets for antiviral drug development.
- Targeting EIF4H and YBX1 offers a potential strategy for developing new treatments against Hepatitis E virus.
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