A System-Level Perspective on Epstein-Barr Virus Persistence: The Partial Lytic Reactivation.

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Epstein-Barr virus (EBV) establishes lifelong infections, typically viewed as alternating between latency and productive lytic replication.
• Emerging evidence suggests EBV frequently undergoes abortive lytic reactivation without producing infectious virions.

Purpose of the Study:

• To propose a new conceptual framework for EBV persistence.
• To understand EBV reactivation dynamics beyond the traditional latency-lytic cycle.

Main Methods:

• Review and synthesis of molecular and single-cell evidence.
• Development of a conceptual model for EBV persistence.
• Analysis of regulatory interactions between viral gene expression and host immunity.

Main Results:

• EBV reactivation is regulated by feedback mechanisms and permissive conditions, not a strict sequential cycle.
• Progression to viral DNA replication is a critical barrier, leading to a stable partial lytic state if not overcome.
• This partial lytic state involves sustained expression of immunomodulatory viral proteins without virion production.

Conclusions:

• EBV persistence is a dynamic equilibrium influenced by viral-host immune interactions.
• Immune surveillance selectively eliminates fully lytic cells, favoring partial lytic states.
• Understanding this dynamic is crucial for interpreting biomarkers and developing therapies for inflammatory and autoimmune diseases.