UBP1 (upstream binding protein 1) is a TFCP2/grainyhead family transcription factor that functions as a sequence-specific DNA-binding activator with context-dependent promoter activity 1. Primary functions include modulating placental CYP11A1 expression and regulating alpha-globin genes in erythroid cells through synergistic interaction with TFCP2, while also repressing HIV-1 transcription by inhibiting TFIID binding to the TATA-box 1. UBP1 plays a critical role in blood pressure regulation; variants in the UBP1 locus associate significantly with systolic and diastolic blood pressure, functioning through transcriptional activation of CYP11A, the rate-limiting enzyme in steroid and pregnenolone biosynthesis 2. In cancer biology, UBP1 promotes breast tumorigenesis through multiple mechanisms including epithelial-mesenchymal transition (EMT), cancer stem cell maintenance, and tumor-associated macrophage polarization via the NRG2/Akt signaling axis 3. Elevated UBP1 expression correlates with poor prognosis and reduced overall survival in breast cancer 3. UBP1 also mediates angiogenesis in endothelial cells through VEGF stimulation and functional interaction with TFCP2 4. Additionally, UBP1 participates in parasitic resistance mechanisms in malaria and trypanosomiasis 56, and recurrent EWSR1-UBP1 gene fusions have been identified in spindle cell rhabdomyosarcomas 7.