POU domain, class 2, transcription factor 1 (UniProt P14859; also known as NF-A1, Oct-1, Octamer-binding protein 1, Octamer-binding transcription factor 1, OTF-1) is encoded by the POU2F1 (also known as OCT1, OTF1) gene (Gene ID 5451) in human. Oct-1 belongs to the family of octamer transcription factors characterized by their binding to the ATTTGCAT octamer sequence via their POU domain (a.a. 280-354 of human Oct-1). Oct1 is widely expressed in adult tissues, however, Oct-1 knockdown has little impact on cell growth and viability in culture. Oct-1 controls multiple stem cell phenotypes in normal and tumor cells. Oct-1 promotes resistance to genotoxic and oxidative stresses in stem cells. Loss of Oct-1 antagonizes oncogenic transformation in vitro and tumorigenicity in vivo.