Plays a role in maintenance of the normal epithelial architecture through the repression of SNAI1 transcription in a histone deacetylase-dependent manner, and thus the regulation of E-cadherin levels. Contributes to transcriptional repression by BCL6. Component of the nucleosome-remodeling and histone-deacetylase multiprotein complex (NuRD) (PubMed:12705869, PubMed:15454082). Interacts with BCL6 (PubMed:15454082). Interacts with NACC2 (PubMed:22926524). Interacts with PWWP2B (By similarity). Expressed in germinal centers of lymphoid tissues. No expression in nonepithelial cells. By estrogen.