PYDC1 (pyrin domain containing 1) functions as a negative regulator of inflammasome signaling and innate immune responses. The protein modulates inflammasome complex assembly by associating with PYCARD/ASC and suppressing the kinase activity of the NF-κB inhibitor kinase (IKK) complex, thereby inhibiting NF-κB activation by cytokines and LPS 1. PYDC1 acts as a negative regulator of NLRP3 inflammasome complex assembly and interleukin-1β production, playing a crucial role in controlling pyroptosis-related pathways 1. The gene is highly expressed during keratinocyte differentiation in the epidermis, where it helps maintain homeostasis by preventing inflammatory responses during cornification 1. PYDC1 expression is strongly induced in differentiated keratinocytes alongside other anti-inflammatory IL-1 family members, suggesting its role in balancing cell death programs 1. The protein has been identified as a direct target of miR-34a in T cell regulatory networks 2. Elevated PYDC1 expression has been observed in various pathological conditions including neuroinflammation following allethrin exposure 3, Alzheimer's disease hippocampal vulnerability 4, and IgA nephropathy 5. These findings highlight PYDC1's critical role in immune regulation and its potential as a biomarker for inflammatory diseases.