LIN37 is an essential component of the DREAM (Dimerization partner, RB-like, E2F and MuvB) transcriptional repressor complex that plays critical roles in cell cycle control and quiescence induction 1. As part of the MuvB core complex, LIN37 works with other components (LIN9, LIN52, LIN54, RBBP4) to form DREAM complexes that include retinoblastoma family proteins and E2F transcription factors 2. LIN37 is absolutely required for DREAM function - cells lacking LIN37 completely lose the ability to repress cell cycle genes in G0/G1 phases, despite other DREAM subunits remaining bound to promoters 1. The protein cooperates with RB to induce cellular quiescence, and dual loss of both RB and LIN37 prevents cell cycle exit entirely 1. In the p53 tumor suppressor pathway, LIN37/DREAM mediates repression of cell cycle genes following DNA damage, with complete loss of G1/S checkpoint control when both LIN37 and RB are absent 3. Additionally, LIN37 prevents DNA end resection and homologous recombination in quiescent cells through a 53BP1-independent mechanism by suppressing expression of DNA repair proteins including BRCA1, BRCA2, and RAD51 4. DREAM-deficient models show defective endochondral bone formation due to failed chondrocyte proliferation arrest 5.