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Citation Information: JCI Insight. 2023;8(19):e172975. https://doi.org/10.1172/jci.insight.172975.
Abstract
Pyrin, a protein encoded by the MEFV gene, plays a vital role in innate immunity by sensing modifications in Rho GTPase and assembling the pyrin inflammasome, which in turn activates downstream immune responses. We identified a novel and de novo MEFV p.E583A dominant variant in 3 patients from the same family; the variant was distinct from the previously reported S242 and E244 sites. These patients exhibited a phenotype that diverged from those resulting from classical MEFV gene mutations, characterized by the absence of recurrent fever but the presence of recurrent chest and abdominal pain. Colchicine effectively controlled the phenotype, and the mutation was found to induce pyrin inflammasome assembly and activation in patients’ peripheral blood mononuclear cells (PBMCs) and cell lines. Mechanistically, truncation experiments revealed that the E583A variant affected the autoinhibitory structure of pyrin. Our study offers insights into the mechanisms underlying pyrin inflammasome activation.
Authors
Qintao Wang, Taijie Jin, Shan Jian, Xu Han, Hongmei Song, Qing Zhou, Xiaomin Yu
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