CLEC4D is a calcium-dependent C-type lectin that functions as a pattern recognition receptor in the innate immune system, recognizing pathogen-associated molecular patterns from bacteria and fungi 12. The protein forms functional complexes with signaling adapter FCER1G, likely through CLEC4E, leading to ITAM phosphorylation and activation of SYK, CARD9, and NF-κB pathways that promote antigen-presenting cell maturation and T-helper cell differentiation 12. CLEC4D can heterodimerize with CLEC6A for enhanced antifungal activity and functions as an endocytic receptor for antigen uptake and processing 23. The gene shows disease relevance across multiple conditions. In cardiovascular disease, CLEC4D expression is upregulated in intermediate monocytes from acute myocardial infarction patients without plaque rupture and serves as a diagnostic biomarker for coronary artery disease progression in type 1 diabetes 45. CLEC4D is also elevated in obese Prader-Willi syndrome patients and correlates with BMI, suggesting involvement in obesity-related inflammation 6. Additionally, it represents a potential therapeutic target in tuberculosis, cardiac remodeling, lung cancer, and shows differential expression in Ebola survivors with optic neuropathy 78910.