Why the body's inflammatory alarm misfires
Institute for the Advanced Study of Human Biology (ASHBi), Kyoto UniversityPeer-Reviewed Publication
Summary
Familial Mediterranean fever (FMF) is a genetic autoinflammatory disorder that causes recurrent fevers and painful inflammation of the abdomen, chest, and joints. The disease is caused by mutations in MEFV, the gene that encodes a protein called pyrin. Yet for nearly three decades, the key step that allows pyrin to activate the inflammatory switch has remained a mystery.
Two new companion studies published in Science Immunology by researchers at Kyoto University and their collaborators now shed light on this long-standing question. Approaching the question from opposite directions—one starting from a small group of patients with severe unexplained inflammation, the other from a systematic functional analysis of 265 mutations in MEFV drawn from genomic databases—the studies converge on the same molecular mechanism. They reveal that a lock-and-key interaction between pyrin and a small cellular regulator called CDC42 acts as the switch that ignites inflammation.
These findings clarify the missing step in pyrin activation and open the way to more accurate diagnosis and personalized treatment for patients living with diseases driven by dysregulated pyrin activity.
The two studies will be published in Science Immunology at 14:00 ET on August 7, 2026 (03:00 JST on August 8, 2026).
- Journal
- Science Immunology