Together with PML, this tumor suppressor is a major constituent of the PML bodies, a subnuclear organelle involved in a large number of physiological processes including cell growth, differentiation and apoptosis. Functions as a transcriptional coactivator of ETS1 and ETS2 according to . Under certain conditions, it may also act as a corepressor of ETS1 preventing its binding to DNA according to . Through the regulation of ETS1 it may play a role in angiogenesis, controlling endothelial cell motility and invasion. Through interaction with the MRN complex it may be involved in the regulation of telomeres lengthening. May also regulate TP53-mediated transcription and through CASP8AP2, regulate FAS-mediated apoptosis. Also plays a role in infection by viruses, including human cytomegalovirus and Epstein-Barr virus, through mechanisms that may involve chromatin and/or transcriptional regulation.Dent A.L., Blood 88:1423-1426(1996).Seeler J.-S., Proc. Natl. Acad. Sci. U.S.A. 95:7316-7321(1998).Szostecki C., J. Immunol. 145:4338-4347(1990).