E4F1 (E4F transcription factor 1) is a zinc finger transcription factor that serves as a master regulator of multiple cellular processes critical for cell survival and genome integrity 1. The protein functions through direct DNA binding to regulate transcription of key target genes, including DLAT and ELP3, which encode subunits of the pyruvate dehydrogenase complex and Elongator complex respectively 2. E4F1 plays essential roles in cell cycle progression and DNA damage response by interacting with and stabilizing checkpoint kinase 1 (CHK1), protecting it from degradation to ensure high-fidelity DNA replication 3. The transcription factor also coordinates metabolic processes, particularly pyruvate metabolism and acetyl-CoA production, which are crucial for translation fidelity during brain development 2. In adipocytes, E4F1 interacts directly with p53 to regulate lipid metabolism, specifically controlling monounsaturated fatty acid synthesis through Stearoyl-CoA Desaturase-1 regulation 4. E4F1 demonstrates tissue-specific functions, being essential for hematopoietic cell survival while its depletion selectively kills myeloid leukemic cells through oxidative stress-mediated mechanisms 5. The protein is overexpressed in human acute myeloid leukemia, suggesting potential therapeutic targeting opportunities 5. Additionally, E4F1 functions as a specific transcriptional activator of the TERT promoter -57A>C mutation in certain cancers 6.