TRIM29 Negatively Regulates the Type I IFN Production in Response to RNA Virus

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• Innate immunity is crucial for antiviral defense, but mechanisms controlling robust responses without autoimmunity are unclear.
• RNA viral infections pose significant challenges, necessitating a deeper understanding of host-pathogen interactions.

Purpose of the Study:

• To investigate the role of the E3 ligase TRIM29 in the innate immune response to RNA viruses.
• To elucidate the molecular mechanisms by which TRIM29 influences antiviral signaling.

Main Methods:

• Stimulation of human myeloid dendritic cells with poly I:C.
• Infection of wild-type and TRIM29-deficient mice with reovirus.
• Analysis of type I interferon production and viral titers.
• Investigation of TRIM29 interaction with MAVS and its ubiquitination status.

Main Results:

• TRIM29 expression is induced in response to poly I:C and negatively impacts type I interferon production.
• TRIM29 deficiency protects mice from lethal reovirus infection by enhancing type I interferon.
• TRIM29 interacts with MAVS, promoting its ubiquitination and degradation, thereby dampening antiviral signaling.

Conclusions:

• TRIM29 acts as a negative regulator of the host innate immune response to RNA viruses.
• RNA viruses may exploit TRIM29 to evade immune detection and promote pathogenesis.
• Targeting TRIM29 could represent a therapeutic strategy against RNA viral infections.