EDF1 (Endothelial Differentiation Factor 1) is a multifunctional transcriptional coactivator and ribosomal stress sensor with primary roles in translation quality control and transcriptional regulation. As a transcriptional coactivator, EDF1 stimulates NR5A1, NR1H3/LXRA, and PPARG activities 1, and enhances DNA-binding of ATF1, ATF2, CREB1, and NR5A1. EDF1 regulates nitric oxide synthase activity and participates in endothelial cell differentiation and lipid metabolism 2. The primary mechanistic function involves coordinating cellular responses to ribosomal collisions caused by aberrant mRNA translation. EDF1 binds the 40S ribosomal subunit near the mRNA entry channel and recruits translational repressors GIGYF2 and EIF4E2 to collided ribosomes, preventing translation of defective mRNAs 3. Additionally, EDF1 functions as a core integrated stress response (ISR) factor by sensing stress-induced ribosome collisions and mediating GCN2 activation 4. In disease contexts, high EDF1 expression in neuroblastoma promotes ganglioside GD3 accumulation through the NF-κB/RelA/EDF1/ST8SIA1 axis, leading to CD8+ T cell dysfunction 5. EDF1 deficiency in pancreatic β cells impairs insulin synthesis and stress responses in type 2 diabetes 6. These findings establish EDF1 as a critical hub linking translational quality control with transcriptional regulation and metabolic homeostasis.