2. Academic Validation
  3. Identification of and Molecular Basis for SIRT6 Loss-of-Function Point Mutations in Cancer

Identification of and Molecular Basis for SIRT6 Loss-of-Function Point Mutations in Cancer

  • Cell Rep. 2015 Oct 20;13(3):479-488. doi: 10.1016/j.celrep.2015.09.022.
Sita Kugel 1,  Jessica L Feldman 2,  Mark A Klein 2,  Dafne M Silberman 3,  Carlos Sebastián 1,  Craig Mermel 4,  Stephanie Dobersch 5,  Abbe R Clark 1,  Gad Getz 4,  John M Denu 6,  Raul Mostoslavsky 7
Affiliations

Affiliations

  • 1 The Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02114, USA.
  • 2 The Department of Biomolecular Chemistry and the Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI 53715, USA.
  • 3 Center for Pharmacological and Botanical Studies (CEFYBO)-CONICET, Facultad de Medicina, UBA, Buenos Aires 1121, Argentina.
  • 4 The Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02114, USA; The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
  • 5 Max-Planck-Institute for Heart and Lung Research, Bad Nauheim 61231, Germany.
  • 6 The Department of Biomolecular Chemistry and the Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI 53715, USA. Electronic address: [email protected].
  • 7 The Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02114, USA; The Center for Regenerative Medicine, The Massachusetts General Hospital, Boston, MA 02114, USA; The Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA. Electronic address: [email protected].
PMID: 26456828 DOI: 10.1016/j.celrep.2015.09.022
Abstract

Chromatin factors have emerged as the most frequently dysregulated family of proteins in Cancer. We have previously identified the histone deacetylase SIRT6 as a key tumor suppressor, yet whether point mutations are selected for in Cancer remains unclear. In this manuscript, we characterized naturally occurring patient-derived SIRT6 mutations. Strikingly, all the mutations significantly affected either stability or catalytic activity of SIRT6, indicating that these mutations were selected for in these tumors. Further, the mutant proteins failed to rescue SIRT6 knockout (SIRT6 KO) cells, as measured by the levels of histone acetylation at glycolytic genes and their inability to rescue the tumorigenic potential of these cells. Notably, the main activity affected in the mutants was histone deacetylation rather than demyristoylation, pointing to the former as the main tumor-suppressive function for SIRT6. Our results identified cancer-associated point mutations in SIRT6, cementing its function as a tumor suppressor in human Cancer.

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