CLEC4A (C-type lectin domain family 4 member A) is an immune regulatory receptor primarily expressed in conventional dendritic cells and monocytes, serving as a pattern recognition receptor with inhibitory functions 1. The protein contains a characteristic C-type lectin carbohydrate recognition domain (CRD) and a unique immunoreceptor tyrosine-based inhibitory motif (ITIM), making it the only classical C-type lectin receptor with this inhibitory feature 1. CLEC4A functions through self-interaction via its CRD, particularly requiring an EPS motif and N-glycosylation site, to elicit ITIM-mediated suppressive signals in conventional dendritic cells 1. The receptor acts as a negative regulator of immune responses, with antagonistic antibodies enhancing dendritic cell and monocyte activation upon TLR stimulation 1. CLEC4A expression is upregulated in various inflammatory conditions including dermatomyositis, psoriasis, and Castleman disease, where it may contribute to immune regulation 234. Additionally, CLEC4A serves as a diagnostic biomarker for bacterial infections like Staphylococcus aureus bloodstream infection and shows altered expression in early-stage lung cancer patients 56. The gene produces multiple mRNA splice variants with different protein-coding potentials, suggesting complex regulatory mechanisms 7.