DAP (death-associated protein) is a multifunctional ribosomal protein with critical roles in translational control and cell death regulation. As a ribosome-binding protein, DAP functions in ribosome hibernation by associating with eIF5A at the polypeptide exit tunnel, preventing mRNA translation and stabilizing ribosomes in an inactive state during oogenesis and early embryonic development [UniProt]. This mechanism allows ribosomes produced in large quantities during oogenesis to be stored and translationally repressed in oocytes and early embryos. Beyond ribosomal function, DAP mediates interferon-gamma-induced cell death 1 and acts as a negative regulator of autophagy 2. Related family members like DAP-kinase are pro-apoptotic Ca²⁺/calmodulin-regulated serine/threonine kinases participating in multiple apoptotic pathways initiated by interferon-gamma, TNF-alpha, Fas activation, and matrix detachment 3. DAP-kinase regulates autophagy through interactions with the Beclin-1/PI3K complex and MAP1B, potentially directing autophagy toward autophagic cell death 4. Clinically, loss of DAP-kinase expression through hypermethylation occurs frequently in human carcinomas and B-cell malignancies, with re-introduction reducing metastatic capacity in experimental models 3, suggesting DAP family proteins function as tumor suppressors. Recent clinical applications include DAP-CAR-T cell constructs for solid tumor immunotherapy targeting mesothelin in ovarian cancer and mesothelioma 5.