The circadian clock components BMAL1 and REV-ERBα regulate flavivirus replication.

Area of Science:

• Virology
• Chronobiology
• Molecular Biology

Background:

• The circadian clock influences immune responses and pathogen replication.
• Molecular mechanisms linking circadian rhythms to viral infections are poorly understood.

Purpose of the Study:

• To investigate the role of circadian clock components BMAL1 and REV-ERBα in the hepatitis C virus (HCV) life cycle.
• To explore the impact of these clock components on flavivirus replication.

Main Methods:

• Genetic knockout of the Bmal1 gene.
• Overexpression and activation of REV-ERBα using synthetic agonists.
• Analysis of HCV and flavivirus replication dynamics.

Main Results:

• BMAL1 and REV-ERBα were found to influence HCV particle entry and RNA replication.
• Inhibition of HCV and flavivirus (dengue, Zika) replication was observed upon Bmal1 knockout or REV-ERBα activation.
• Perturbation of lipid signaling pathways was identified as a mechanism.

Conclusions:

• The circadian clock component REV-ERBα plays a significant role in regulating flavivirus replication.
• Circadian regulators like REV-ERBα represent potential targets for antiviral therapies.