“…Many proteins that are poly-(ADP-ribosyl)ated by PARP-1 have been identified, including PARP-1 itself (43), histones (26), lamins (1), topoisomerases (25), DNA polymerases (44,70), c-Fos (2), and p53 tumor suppressor protein (68). Since the attachment of the negatively charged polymer changes the properties of the acceptor protein (40,46), PARP-1 could be involved in a variety of cellular events, including modulation of chromatin structure, DNA synthesis, DNA repair, gene transcription, and cell cycle reg-ulation (13). In particular, the studies with PARP inhibitors have shown that PARP-1 plays an important role in maintenance of genome integrity (10,34,35).…”