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-induced destabilization of human T reg cells, maintaining FOXP3 expression and suppressive function.

• Why it matters: Understanding how human T reg cells lose their identity under inflammatory conditions is crucial for developing effective T reg cell therapies, as destabilization can impair immune regulation.
• What they did: The study used single-cell chromatin accessibility and transcriptomic profiling on human T reg cells undergoing cytokine-driven destabilization, focusing on a distal IRF4 element and its role in gene regulation.
• The result: Excision of the IRF4 regulatory element conferred resistance to inflammatory cytokine reprogramming, suggesting this element is a key target for enhancing T reg cell stability in therapeutic applications.