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Cell. 2014 Jul 31;158(3):659-72. doi: 10.1016/j.cell.2014.06.050.

Partitioning circadian transcription by SIRT6 leads to segregated control of cellular metabolism.

Author information

1
Center for Epigenetics and Metabolism, University of California, Irvine, Irvine, CA 92697, USA; Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697, USA.
2
Department of Computer Science, University of California, Irvine, Irvine, CA 92697, USA; Institute for Genomics and Bioinformatics, University of California, Irvine, Irvine, CA 92697, USA.
3
The Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02114, USA.
4
Genetics of Development and Diseases Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892, USA.
5
Metabolic Disease Program, Sanford-Burnham Medical Research Institute, Orlando, FL 32827, USA.
6
Center for Epigenetics and Metabolism, University of California, Irvine, Irvine, CA 92697, USA; Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697, USA; Department of Computer Science, University of California, Irvine, Irvine, CA 92697, USA; Institute for Genomics and Bioinformatics, University of California, Irvine, Irvine, CA 92697, USA.
7
Center for Epigenetics and Metabolism, University of California, Irvine, Irvine, CA 92697, USA; Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697, USA; Institute for Genomics and Bioinformatics, University of California, Irvine, Irvine, CA 92697, USA; INSERM U904, Sprague Hall, University of California, Irvine, Irvine, CA 92697, USA. Electronic address: psc@uci.edu.

Abstract

Circadian rhythms are intimately linked to cellular metabolism. Specifically, the NAD(+)-dependent deacetylase SIRT1, the founding member of the sirtuin family, contributes to clock function. Whereas SIRT1 exhibits diversity in deacetylation targets and subcellular localization, SIRT6 is the only constitutively chromatin-associated sirtuin and is prominently present at transcriptionally active genomic loci. Comparison of the hepatic circadian transcriptomes reveals that SIRT6 and SIRT1 separately control transcriptional specificity and therefore define distinctly partitioned classes of circadian genes. SIRT6 interacts with CLOCK:BMAL1 and, differently from SIRT1, governs their chromatin recruitment to circadian gene promoters. Moreover, SIRT6 controls circadian chromatin recruitment of SREBP-1, resulting in the cyclic regulation of genes implicated in fatty acid and cholesterol metabolism. This mechanism parallels a phenotypic disruption in fatty acid metabolism in SIRT6 null mice as revealed by circadian metabolome analyses. Thus, genomic partitioning by two independent sirtuins contributes to differential control of circadian metabolism.

PMID:
25083875
PMCID:
PMC5472354
DOI:
10.1016/j.cell.2014.06.050
[Indexed for MEDLINE]
Free PMC Article
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