Viral genome silencing by neuronal sirtuin 1

Area of Science:

• Neurovirology
• Epigenetics
• Neuroscience

Background:

• Neurotropic viruses establish lifelong latency within sensory neurons.
• Viral reactivation can lead to various neuropathic conditions, including chronic pain.
• Latent viral DNA exists as extrachromosomal circular episomes associated with histones.

Purpose of the Study:

• To investigate the role of the NAD(+)-dependent histone deacetylase Sirt1 in regulating adenoviral genome expression in neurons.
• To explore the potential link between neuronal NAD(+) levels and viral reactivation.

Main Methods:

• Utilized dorsal root ganglion neurons.
• Examined the impact of pharmacological Sirt1 modulation on viral transgene expression.
• Assessed the effects of Sirt1 overexpression on viral gene expression.

Main Results:

• Sirt1 activity directly influences adenoviral genome regulation within neurons.
• Both Sirt1 inhibition and overexpression altered viral transgene expression.
• Neuronal NAD(+) depletion, potentially due to aging or stress, is implicated as a trigger for viral reactivation.

Conclusions:

• Sirt1 is a key regulator of adenoviral gene expression in sensory neurons.
• Neuronal NAD(+) homeostasis is critical for maintaining viral latency.
• Targeting Sirt1 or NAD(+) metabolism may offer therapeutic strategies for viral reactivation-associated diseases.