Unveiling the Mysteries of CLEC3B: Physiological Roles, Pathological Impacts, and Research Gaps

(C-type lectin domain family 3 member B), also known as tetranectin (TN), is a secreted trimeric protein containing a C-type lectin-like domain (CTLD). Located on chromosome 3p21.31. CLEC3B maintains organismal homeostasis through roles in immune regulation, angiogenesis, and musculoskeletal biology. Genetic studies demonstrate that CLEC3B deficiency impairs tissue repair, bone mineralization, and fibrinolytic balance. Altered CLEC3B expression is linked to cardiovascular disease progression, autoimmune susceptibility, and cancer prognosis. This review synthesizes CLEC3B's biological functions and evaluates its translational potential: circulating CLEC3B as a prognostic and diagnostic biomarker; tissue-resident CLEC3B as a predictive marker for therapeutic response; and CLEC3B-related pathways as candidate therapeutic targets for potential amenable to replacement or inhibition strategies. We identify critical research gaps to guide future investigations, including limited structural data, ambiguous glycan specificity, incomplete proteolytic network mapping, and lack of validated disease models. Collectively, these gaps currently preclude definitive therapeutic claims.