Enables DNA-binding transcription activator activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in adenohypophysis development; negative regulation of transcription by RNA polymerase II; and positive regulation of transcription by RNA polymerase II. Located in nucleus. Colocalizes with chromatin. Human ortholog(s) of this gene implicated in panhypopituitarism and pituitary gland disease. Orthologous to human POU1F1 (POU class 1 homeobox 1). [provided by Alliance of Genome Resources, Apr 2022]