Enables transcription corepressor activity. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Located in replication fork. Is expressed in several structures, including alimentary system; brain; cardiovascular system; genitourinary system; and immune system. Orthologous to human DMAP1 (DNA methyltransferase 1 associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]