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Molecular Cancer Research 2:371-386 (2004)
© 2004 American Association for Cancer Research

Subject Review

p63 and p73: Roles in Development and Tumor Formation1

Ute M. Moll1 and Neda Slade2

1 Department of Pathology, State University of New York at Stony Brook, Stony Brook, New York and 2 Department of Molecular Medicine, Ruder Boskovic Institute, Zagreb, Croatia

Requests for reprints: Ute M. Moll, Department of Pathology, State University of New York at Stony Brook, BST L9 R134, R132-136, Stony Brook, NY 11794-8691. Phone: 631-444-2459; Fax: 631-444-3424. E-mail: umoll{at}notes.cc.sunysb.edu

The tumor suppressor p53 is critically important in the cellular damage response and is the founding member of a family of proteins. All three genes regulate cell cycle and apoptosis after DNA damage. However, despite a remarkable structural and partly functional similarity among p53, p63, and p73, mouse knockout studies revealed an unexpected functional diversity among them. p63 and p73 knockouts exhibit severe developmental abnormalities but no increased cancer susceptibility, whereas this picture is reversed for p53 knockouts. Neither p63 nor p73 is the target of inactivating mutations in human cancers. Genomic organization is more complex in p63 and p73, largely the result of an alternative internal promoter generating NH2-terminally deleted dominant-negative proteins that engage in inhibitory circuits within the family. Deregulated dominant-negative p73 isoforms might play an active oncogenic role in some human cancers. Moreover, COOH-terminal extensions specific for p63 and p73 enable further unique protein-protein interactions with regulatory pathways involved in development, differentiation, proliferation, and damage response. Thus, p53 family proteins take on functions within a wide biological spectrum stretching from development (p63 and p73), DNA damage response via apoptosis and cell cycle arrest (p53, TAp63, and TAp73), chemosensitivity of tumors (p53 and TAp73), and immortalization and oncogenesis ({Delta}Np73).




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