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. Predicted to be part of post-mRNA release spliceosomal complex. Predicted to be active in cytoplasm and nucleus. Is expressed in central nervous system; liver; sensory organ; thymus; and vertebral axis musculature. Orthologous to human MYEF2 (myelin expression factor 2). [provided by Alliance of Genome Resources, Apr 2022]