DENR is a translation regulator that forms a heterodimeric complex with MCTS1 to control translation reinitiation, a process where ribosomes resume scanning and initiate translation at downstream open reading frames (ORFs) following termination at upstream ORFs (uORFs) 1. The DENR-MCTS1 complex functions through two key mechanisms: dissociation of deacylated tRNAs from post-termination 40S ribosomal complexes and EIF2-independent recruitment of aminoacylated initiator tRNA to the 40S P site for new translation rounds 2. This complex regulates translation of over 150 genes whose reinitiation depends on DENR-MCTS1 activity. Clinically, DENR plays important roles in cancer immunology and cell cycle regulation. DENR controls JAK2 translation through antagonizing translational repression of three consecutive uORFs upstream of JAK2, thereby regulating the IFNγ-JAK-STAT signaling pathway and PD-L1 expression in tumors; DENR depletion reduces tumor growth and enhances CD8+ T cell-mediated killing 3. During mitosis, Cyclin B/CDK1 and Cyclin A/CDK2 phosphorylate DENR at Serine 73, promoting mitotic protein translation and faithful cell division; loss of DENR phosphorylation causes aberrant mitoses and cell death 4. Recent evidence suggests DENR dysfunction associates with neurodegenerative diseases, including Parkinson's disease, where DENR downregulation serves as a potential diagnostic biomarker 5.