Enables DNA binding activity and DNA-binding transcription factor activity, RNA polymerase II-specific. Involved in several processes, including central nervous system myelin maintenance; positive regulation of myelination; and regulation of transcription, DNA-templated. Located in endoplasmic reticulum membrane and nucleus. Is expressed in pigmented retinal epithelium; spinal cord; and spinal cord marginal layer. Orthologous to human MYRF (myelin regulatory factor). [provided by Alliance of Genome Resources, Apr 2022]