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EBV Reactivation from Latency Is a Degrading Experience for the Host
Alejandro Casco1, Eric Johannsen1,2
1Department of Oncology, McArdle Laboratory for Cancer Research, University of Wisconsin, Madison, WI 53705, USA.
Viruses
|March 30, 2023
Summary
Epstein-Barr virus (EBV) uses the BGLF5 nuclease to degrade host cell mRNAs during reactivation. This process, known as host shutoff, suppresses host gene expression to facilitate viral replication.
Area of Science:
- Virology
- Molecular Biology
- Cellular Biology
Background:
- Gammaherpesviruses, including Epstein-Barr virus (EBV), reprogram host cells for viral production upon reactivation from latency.
- A key viral strategy involves suppressing host gene expression by degrading cytoplasmic mRNAs.
- This host shutoff mechanism is crucial for efficient virion production and evading cellular defenses.
Purpose of the Study:
- To review the mechanisms employed by EBV and other gammaherpesviruses to induce host shutoff.
- To explore the role and function of the EBV BGLF5 nuclease in mRNA degradation.
- To discuss the specificity, consequences, and measurement challenges of EBV-induced host shutoff.
Main Methods:
- Review of existing literature on gammaherpesvirus host shutoff mechanisms.
- Analysis of the function and action of the Epstein-Barr virus BGLF5 nuclease.
- Discussion of experimental approaches and limitations in studying EBV host shutoff.
Main Results:
- Epstein-Barr virus utilizes the BGLF5 nuclease as a primary effector for canonical host shutoff.
- BGLF5 induces rapid degradation of cytoplasmic mRNAs, leading to suppressed host gene expression.
- Non-canonical shutoff mechanisms and challenges in accurately measuring EBV host shutoff are also considered.
Conclusions:
- The BGLF5 nuclease is a key viral factor enabling Epstein-Barr virus to manipulate host gene expression during lytic replication.
- Understanding these shutoff mechanisms is vital for comprehending gammaherpesvirus pathogenesis and developing therapeutic strategies.
- Further research is needed to overcome limitations in accurately quantifying the EBV host shutoff phenomenon.
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