MAVS maintains mitochondrial import competence and also limits RNA virus replication independently of interferon signaling.

MAVS preserves mitochondrial import and independently restricts RNA virus replication, including SARS-CoV-2, by maintaining mitochondrial integrity without relying on interferon signaling.

• Why it matters: Understanding how cells defend themselves intrinsically against viruses without activating interferon pathways is crucial for developing new antiviral strategies, especially when viruses evade immune responses.
• What they did: The study used molecular and cellular approaches to show that MAVS stabilizes mitochondrial import machinery, preventing mitochondrial damage and supporting antiviral defenses in the absence of interferon signaling.
• The result: Restoring MAVS reverses mitochondrial defects and enhances antiviral activity, enabling effective suppression of RNA viruses like SARS-CoV-2, highlighting a novel, interferon-independent immune mechanism.