Transcriptional repressor that binds to the consensus sequence 5'-CGGACGTT-3' and to the RB1 promoter. Transcriptional activator that promotes histone H4 gene transcription at the G1/S phase transition in conjunction with NPAT. Also activates transcription of the ATM and PRKDC genes. Autoregulates its expression by associating with its own promoter. Binds MBD2 and a histone deacetylase complex. Interacts with NPAT. Associated with discrete nuclear foci. Ubiquitous. Highly expressed in brain, heart, skeletal muscle, spleen, kidney, small intestine, placenta and liver. Ubiquitinated. Ubiquitination may lead to proteasome-mediated degradation.