Loss of Tankyrase-mediated destruction of 3BP2 is the underlying pathogenic mechanism of cherubism.

Ontario Cancer Institute and the Campbell Family Cancer Research Institute, 101 College Street, Rm 8-703, Toronto Medical Discovery Tower, University of Toronto, Toronto, Ontario M5G 1L7, Canada.

Cell 2011 Dec 9

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Cherubism is an autosomal-dominant syndrome characterized by inflammatory destructive bony lesions resulting in symmetrical deformities of the facial bones. Cherubism is caused by mutations in Sh3bp2, the gene that encodes the adaptor protein 3BP2. Most identified mutations in 3BP2 lie within the peptide sequence RSPPDG. A mouse model of cherubism develops hyperactive bone-remodeling osteoclasts and systemic inflammation characterized by expansion of the myelomonocytic lineage. The mechanism by which cherubism mutations alter 3BP2 function has remained obscure. Here we show that Tankyrase, a member of the poly(ADP-ribose)polymerase (PARP) family, regulates 3BP2 stability through ADP-ribosylation and subsequent ubiquitylation by the E3-ubiquitin ligase RNF146 in osteoclasts. Cherubism mutations uncouple 3BP2 from Tankyrase-mediated protein destruction, which results in its stabilization and subsequent hyperactivation of the SRC, SYK, and VAV signaling pathways. Copyright © 2011 Elsevier Inc. All rights reserved.

Citation

Noam Levaot, Oleksandr Voytyuk, Ioannis Dimitriou, Fabrice Sircoulomb, Arun Chandrakumar, Marcel Deckert, Paul M Krzyzanowski, Andrew Scotter, Shengqing Gu, Salima Janmohamed, Feng Cong, Paul D Simoncic, Yasuyoshi Ueki, Jose La Rose, Robert Rottapel. Loss of Tankyrase-mediated destruction of 3BP2 is the underlying pathogenic mechanism of cherubism. Cell. 2011 Dec 9;147(6):1324-39