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Taylor JR, Wood JG, Mizerak E, Hinthorn S, Liu J, Finn M, Gordon S, Zingas L, Chang C, Klein MA, Denu JM, Gorbunova V, Seluanov A, Boeke JD, Sedivy JM, Helfand SL. Sirt6 regulates lifespan in Drosophila melanogaster. Proc Natl Acad Sci U S A 2022; 119:e2111176119. [PMID: 35091469 PMCID: PMC8812521 DOI: 10.1073/pnas.2111176119] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 12/01/2021] [Indexed: 01/13/2023] Open
Abstract
Sirt6 is a multifunctional enzyme that regulates diverse cellular processes such as metabolism, DNA repair, and aging. Overexpressing Sirt6 extends lifespan in mice, but the underlying cellular mechanisms are unclear. Drosophila melanogaster are an excellent model to study genetic regulation of lifespan; however, despite extensive study in mammals, very little is known about Sirt6 function in flies. Here, we characterized the Drosophila ortholog of Sirt6, dSirt6, and examined its role in regulating longevity; dSirt6 is a nuclear and chromatin-associated protein with NAD+-dependent histone deacetylase activity. dSirt6 overexpression (OE) in flies produces robust lifespan extension in both sexes, while reducing dSirt6 levels shortens lifespan. dSirt6 OE flies have normal food consumption and fertility but increased resistance to oxidative stress and reduced protein synthesis rates. Transcriptomic analyses reveal that dSirt6 OE reduces expression of genes involved in ribosome biogenesis, including many dMyc target genes. dSirt6 OE partially rescues many effects of dMyc OE, including increased nuclear size, up-regulation of ribosome biogenesis genes, and lifespan shortening. Last, dMyc haploinsufficiency does not convey additional lifespan extension to dSirt6 OE flies, suggesting dSirt6 OE is upstream of dMyc in regulating lifespan. Our results provide insight into the mechanisms by which Sirt6 OE leads to longer lifespan.
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Affiliation(s)
- Jackson R Taylor
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Jason G Wood
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Evan Mizerak
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Samuel Hinthorn
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Julianna Liu
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Matthew Finn
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Sarah Gordon
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Louis Zingas
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Chengyi Chang
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Mark A Klein
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53726
| | - John M Denu
- Department of Biomolecular Chemistry, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53726
| | - Vera Gorbunova
- Department of Biology, University of Rochester, Rochester, NY 14627
- Department of Medicine, University of Rochester, Rochester, NY 14627
| | - Andrei Seluanov
- Department of Biology, University of Rochester, Rochester, NY 14627
- Department of Medicine, University of Rochester, Rochester, NY 14627
| | - Jef D Boeke
- Institute for Systems Genetics, NYU Langone Health, New York, NY 10016
- Department of Biochemistry and Molecular Pharmacology, NYU Langone Health, New York, NY 10016
- Department of Biomedical Engineering, Tandon School of Engineering, Brooklyn, NY 11201
| | - John M Sedivy
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912
| | - Stephen L Helfand
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912;
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