Sir2 (Silent Information Regulator-2) proteins function in aging and lifespan regulation in multiple model organisms. Our long-term goal is to understand the molecular mechanisms that underlie human aging and age-associated pathologies, and the role of human Sir2 factors in attenuating these processes. Preliminary work indicates that one mammalian Sir2 protein, SIRT6, suppresses genomic instability and attenuates the onset of several age-associated pathologies. However, the molecular mechanisms of SIRT6 function are not known. Thus, a systematic characterization of the basic molecular mechanisms through which SIRT6 functions in human cells should be instrumental for elucidating fundamental biological processes that impact on human health in aging. Here, the overall hypothesis to be investigated is that SIRT6 exerts its effects on aging-associated cellular processes and genome maintenance via novel functions at chromatin. A series of biochemical, cellular, and global proteomic and genomic analyses will be carried out to define the molecular functions of SIRT6 in human cells.
Three Specific Aims are proposed: 1. To elucidate the molecular mechanisms by which SIRT6 functions in chromatin regulation. Post-translational modifications of histones at chromatin play important roles in gene expression programs and DNA damage responses. Preliminary results indicate that SIRT6 is tightly associated with, and may catalyze modifications of, histones at chromatin. We will define the enzymatic activity of SIRT6 at chromatin and the effects of altered SIRT6 levels on chromatin structure and functional states. 2. To elucidate the role of the human SIRT6 protein in genome stabilization and DNA repair. SIRT6-deficient cells show increased genomic instability and sensitivity to oxidative and alkylating DNA lesions that are proposed to contribute to aging. A series of functional and biochemical experiments are proposed to elucidate the molecular mechanisms by which SIRT6 exerts its effects on genome maintenance. 3. To elucidate novel SIRT6 regulated molecular pathways. Proteomic and biochemical approaches will be taken to isolate and characterize SIRT6 substrates, protein binding partners, and macromolecular complexes. In addition, genome wide approaches will be employed to identify SIRT6-regulated genes and SIRT6 binding sites at chromatin. ? ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
1R01AG028867-01
Application #
7134173
Study Section
Cellular Mechanisms in Aging and Development Study Section (CMAD)
Program Officer
Mccormick, Anna M
Project Start
2006-08-01
Project End
2007-02-28
Budget Start
2006-08-01
Budget End
2007-02-28
Support Year
1
Fiscal Year
2006
Total Cost
$160,368
Indirect Cost
Name
Stanford University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
009214214
City
Stanford
State
CA
Country
United States
Zip Code
94305
Tasselli, Luisa; Xi, Yuanxin; Zheng, Wei et al. (2016) SIRT6 deacetylates H3K18ac at pericentric chromatin to prevent mitotic errors and cellular senescence. Nat Struct Mol Biol 23:434-40
Malik, Shivani; Villanova, Lidia; Tanaka, Shinji et al. (2015) SIRT7 inactivation reverses metastatic phenotypes in epithelial and mesenchymal tumors. Sci Rep 5:9841
Paredes, Silvana; Villanova, Lidia; Chua, Katrin F (2014) Molecular pathways: emerging roles of mammalian Sirtuin SIRT7 in cancer. Clin Cancer Res 20:1741-6
Simeoni, Federica; Tasselli, Luisa; Tanaka, Shinji et al. (2013) Proteomic analysis of the SIRT6 interactome: novel links to genome maintenance and cellular stress signaling. Sci Rep 3:3085
Shin, Jiyung; He, Ming; Liu, Yufei et al. (2013) SIRT7 represses Myc activity to suppress ER stress and prevent fatty liver disease. Cell Rep 5:654-665
Moore, Kaitlyn E; Carlson, Scott M; Camp, Nathan D et al. (2013) A general molecular affinity strategy for global detection and proteomic analysis of lysine methylation. Mol Cell 50:444-56
Barber, Matthew F; Michishita-Kioi, Eriko; Xi, Yuanxin et al. (2012) SIRT7 links H3K18 deacetylation to maintenance of oncogenic transformation. Nature 487:114-8
Tennen, Ruth I; Bua, Dennis J; Wright, Woodring E et al. (2011) SIRT6 is required for maintenance of telomere position effect in human cells. Nat Commun 2:433
Levy, Dan; Kuo, Alex J; Chang, Yanqi et al. (2011) Lysine methylation of the NF-?B subunit RelA by SETD6 couples activity of the histone methyltransferase GLP at chromatin to tonic repression of NF-?B signaling. Nat Immunol 12:29-36
Tennen, Ruth I; Chua, Katrin F (2011) Chromatin regulation and genome maintenance by mammalian SIRT6. Trends Biochem Sci 36:39-46

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