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Published on: June 26, 2020
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Genetic determinants of host- and virus-derived insertions for hepatitis E virus replication
Michael Hermann Wißing1, Toni Luise Meister1,2,3,4, Maximilian Klaus Nocke1,5
1Department for Molecular and Medical Medicine, Ruhr University Bochum, Bochum, Germany.
Nature Communications
|June 6, 2024
Summary
New Hepatitis E virus (HEV) sequences found in patients can boost viral replication. These genetic changes, including insertions in the hypervariable region (HVR), offer insights into HEV adaptation during infection.
Area of Science:
- Virology
- Molecular Biology
- Hepatology
Background:
- Hepatitis E virus (HEV) is a significant cause of acute viral hepatitis.
- HEV exhibits a highly variable hypervariable region (HVR) capable of genomic rearrangements.
Purpose of the Study:
- To investigate the impact of novel sequence insertions in HEV found in a ribavirin treatment failure patient.
- To identify viral determinants that enhance HEV replication.
Main Methods:
- Identification of sequence insertions in patient serum samples.
- Subgenomic replicon assay to assess viral replication and ribavirin sensitivity.
- Alanine scanning mutagenesis and fluorescence microscopy to analyze HVR lysine residue function and intracellular localization.
Main Results:
- Previously undescribed sequence snippets were identified as insertions in HEV from a patient.
- These insertions enhanced viral replication without altering ribavirin sensitivity.
- Insertions contained nuclear localization sequences; HVR lysine residues influenced replication and localization.
- Distinct sequence patterns outside the HVR also enhanced HEV replication.
Conclusions:
- Patient-derived HEV insertions can increase viral replication.
- Synergistic viral determinants within and outside the HVR contribute to HEV adaptation.
- Findings elucidate mechanisms of viral adaptation through sequence acquisition during infection.
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