TRAFD1 (TRAF-type zinc finger domain containing 1) is a multifunctional negative regulator of immune and inflammatory responses with diverse cellular roles. The protein serves as a crucial modulator of innate immune signaling pathways, including both Toll-like receptor 4 (TLR4) and DDX58/RIG1-like helicases (RLH) pathways, likely through direct interaction with TRAF6 and attenuation of NF-κB activation 1. TRAFD1 functions as a cytosolic protein that interacts with MAVS to negatively regulate antiviral signaling during innate immune activation 1. Beyond immune regulation, TRAFD1 plays essential roles in osteoclast function by interacting with Plekhm1 to regulate vesicle trafficking, acidification, and bone resorption 2. The protein also demonstrates involvement in metabolic and inflammatory disease pathways, including celiac disease where its expression increases during gluten-free diet treatment 3, and rheumatoid arthritis where HBV-encoded HBx promotes fibroblast-myofibroblast transition through TRAFD1 upregulation 4. Additionally, TRAFD1 serves as a target for miR-34a regulation in T cell networks 5 and represents a potential therapeutic target, as demonstrated by tigloside-mediated macrophage repolarization through TRAFD1 destabilization in osteoarthritis treatment 6.