Enables DNA-binding transcription repressor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in negative regulation of transcription by RNA polymerase II; positive regulation of transcription by RNA polymerase II; and protein localization to nucleus. Located in nucleus. Orthologous to human HDGF (heparin binding growth factor). [provided by Alliance of Genome Resources, Apr 2022]