Enables DNA-binding transcription factor activity, RNA polymerase II-specific; RNA polymerase II transcription regulatory region sequence-specific DNA binding activity; and RNA polymerase II-specific DNA-binding transcription factor binding activity. Involved in mechanosensory behavior; neuron differentiation; and positive regulation of transcription by RNA polymerase II. Located in nucleus. Part of RNA polymerase II transcription regulator complex. Expressed in neurons. Human ortholog(s) of this gene implicated in autosomal dominant nonsyndromic deafness 15. Is an ortholog of human POU4F1 (POU class 4 homeobox 1); POU4F2 (POU class 4 homeobox 2); and POU4F3 (POU class 4 homeobox 3).