Predicted to enable transcription corepressor activity. Acts upstream of or within negative regulation of transcription by RNA polymerase II and skeletal muscle cell differentiation. Located in nucleus. Is expressed in several structures, including branchial arch; early embryo; embryo mesenchyme; forelimb bud; and sensory organ. Orthologous to human SAP30 (Sin3A associated protein 30). [provided by Alliance of Genome Resources, Apr 2022]