Acts upstream of or within negative regulation of transcription by RNA polymerase II; negative regulation of transcription regulatory region DNA binding activity; and skeletal muscle cell differentiation. Located in cytosol and nucleus. Is expressed in pineal gland; retina; retina inner nuclear layer; retina outer nuclear layer; and testis. Orthologous to human ANKRD33 (ankyrin repeat domain 33). [provided by Alliance of Genome Resources, Apr 2022]