Plays a role as a transcriptional repressor during development. May play a role in the control of cell survival (By similarity). Interacts with FAT1 (By similarity). Interacts with HDAC1 and ATN1. Interaction with ATN1 is improved when the poly-Gln region of ATN1 is extended (By similarity). Localized in nuclear bodies of variable size. Colocalized with PML and BAX in nuclear PODs (By similarity). Widely expressed. The interaction with ATN1 is mediated by the coiled domain.