Switching of transcriptional control from interferon regulatory factor 2 to interferon regulatory factor 1 drives innate immune cell activation.

Switching from IRF2 to IRF1 occupancy at ISG sites enhances innate immune gene activation during inflammation in mice.

• Why it matters: Understanding how IRF2 suppresses versus promotes inflammation addresses a key gap in innate immune regulation and could inform treatments for inflammatory diseases.
• What they did: The study used chromatin profiling and molecular analyses in mice, revealing that IRF1 displaces IRF2 at ISG regulatory sites, with IRF1 recruiting SPOP to degrade IRF2, especially after TLR signaling.
• The result: This hierarchical transcriptional switch enables IRF1-driven gene programs that promote innate immunity and autoinflammation, highlighting a dynamic control mechanism during immune responses.