The protein encoded by this gene is a member of the d4 domain family, characterized by a zinc finger-like structural motif. This protein functions as a transcription factor which is necessary for the apoptotic response following deprivation of survival factors. It likely serves a regulatory role in rapid hematopoietic cell growth and turnover. This gene is considered a candidate gene for multiple endocrine neoplasia type I, an inherited cancer syndrome involving multiple parathyroid, enteropancreatic, and pituitary tumors. Plays an active role in transcriptional regulation by binding modified histones H3 and H4. Might also have a role in the development and maturation of lymphoid cells. Involved in the regulation of non-canonical NF-kappa-B pathway