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; roof of mouth development; and skeletal muscle organ development. Acts upstream of or within cellular response to leukemia inhibitory factor. Located in nucleus. Is expressed in several structures, including branchial arch; foregut; limb bud; musculature; and trunk mesenchyme. Orthologous to human MSC (musculin). [provided by Alliance of Genome Resources, Apr 2022]