Enables histone deacetylase activity and transcription coregulator activity. Involved in negative regulation of transcription, DNA-templated. Acts upstream of or within DNA methylation; negative regulation of transcription by RNA polymerase II; and positive regulation of transcription by RNA polymerase II. Located in nucleus. Part of NuRD complex. Is expressed in several structures, including central nervous system; early conceptus; genitourinary system; limb; and retina. Used to study systemic lupus erythematosus. Orthologous to human MTA2 (metastasis associated 1 family member 2). [provided by Alliance of Genome Resources, Apr 2022]