Hidden in Plain Sight: Alphavirus Persistence and Its Potential for Driving Chronic Pathogenesis

Area of Science:

• Virology
• Immunology
• Pathogenesis

Background:

• Alphaviruses were traditionally considered acute, self-limiting pathogens.
• Recent findings indicate persistent viral RNA and antigens in vertebrate hosts post-infection.
• Viral persistence is a complex phenomenon involving viral replication and host immune responses.

Purpose of the Study:

• To synthesize evidence on alphavirus persistence in vertebrate hosts.
• To discuss mechanisms of alphavirus persistence beyond the acute phase.
• To identify knowledge gaps and future research directions in alphavirus pathogenesis.

Main Methods:

• Review and synthesis of existing in vitro and in vivo studies on alphavirus persistence.
• Analysis of viral and host factors contributing to persistence.
• Exploration of cellular and tissue niches supporting long-term infection.

Main Results:

• Alphavirus persistence involves dynamic interplay between viral replication (lytic/non-lytic) and host defenses.
• Persistent infections establish cellular/tissue niches evading immune clearance.
• Persistence mechanisms include niche tropism, host pathway reprogramming, and immune modulation.

Conclusions:

• Alphavirus persistence is a critical factor in pathogenesis, extending beyond acute infection.
• Understanding viral and host determinants is key to resolving persistence mechanisms.
• Further research is essential to elucidate alphavirus persistence and its role in chronic disease.