Deletion of a distal IRF4 element prevents inflammation-induced reprogramming of human regulatory T cell fate.

Deletion of a distal IRF4 regulatory element prevents cytokine-driven destabilization of human T reg cells, maintaining their suppressive identity and function.

• Why it matters: Understanding how human T reg cells lose their identity under inflammatory conditions is crucial for improving T reg cell therapies and controlling autoimmune responses.
• What they did: The study used single-cell chromatin and transcriptomic profiling to identify increased accessibility at an IRF4-associated enhancer during T reg destabilization and tested its role through genetic excision and IRF4 overexpression.
• The result: Removing the IRF4 regulatory element conferred resistance to inflammatory cytokine effects, highlighting its potential as a target to enhance T reg cell stability for therapeutic applications.