TCP1 (t-complex 1) is a critical component of the chaperonin-containing T-complex (TRiC), a molecular chaperone complex that assists in protein folding through ATP hydrolysis 1234. The TRiC complex specifically mediates folding of essential cytoskeletal proteins including actin and tubulin, and regulates telomere maintenance by facilitating WRAP53/TCAB1 folding 1. Additionally, TCP1 contributes to BBSome assembly, a complex involved in ciliogenesis and vesicular transport to cilia 5. The protein is located on chromosome 6-qter and shares structural similarity with mouse t-complex genes, though it is not part of an HLA-linked complex 6. TCP1 and related CCT subunits interact with immune regulatory proteins like ANKRD55, affecting T cell receptor signaling and immune synapse formation, which has implications for autoimmune diseases like multiple sclerosis 7. Clinically, TCP1 family members show prognostic significance across multiple cancers, with CCT subunits associated with treatment resistance and stemness maintenance 89. The protein's essential role in cellular proteostasis and immune function makes it relevant to both neurodegenerative diseases and cancer progression.