Transcriptional regulator. Critical factor essential for ovary differentiation and maintenance, and repression of the genetic program for somatic testis determination (By similarity). Prevents trans-differentiation of ovary to testis through transcriptional repression of the Sertoli cell-promoting gene SOX9 (By similarity). Has apoptotic activity in ovarian cells (By similarity). Suppresses ESR1-mediated transcription of PTGS2/COX2 stimulated by tamoxifen (By similarity). Activates SIRT1 transcription under cellular stress conditions (By similarity). Activates transcription of OSR2 (By similarity). Is a regulator of CYP19 expression (By similarity). Is a transcriptional repressor of STAR (By similarity). Participates in SMAD3-dependent transcription of FST via the intronic SMAD-binding element (By similarity). Interacts with ESR1. Interacts with UBE2I/UBC9. Interacts with SMAD3. Interacts with DDX20. Sumoylated with SUMO1; sumoylation is required for transcriptional repression activity.