Document Detail

Sub-cellular localization, expression and functions of Sirt6 during the cell cycle in HeLa cells.
MedLine Citation:
PMID:  22743824     Owner:  NLM     Status:  MEDLINE    
Sirtuin 6 (Sirt6), a mammalian Sir2 (silent information regulator-2) ortholog, is an NAD (+) -dependent histone deacetylase that modulates chromatin structure and genomic stability. Sirt6 knockout cells demonstrate genomic instability, and a deficiency of Sirt6 in mice leads to an aging phenotype early in life. Some nuclear sirtuins, such as Sirt7, localize to the nucleolus, and others, such as Sirt1, are mainly found in the nucleoplasm, with a minor population in the nucleolus. However, Sirt6 has been reported to be a nucleoplasmic protein that is excluded from the nucleolus. Because of the importance of a protein's localization to its interactions and functions, we evaluated Sirt6 sub-cellular localization, expression and functions throughout the cell cycle in HeLa cells. Our results showed that during interphase, Sirt6 was mostly localized to the nucleus, although it was not absent from the nucleolus. Sirt6 was enriched in the nucleolus in the G 1 phase of the cell cycle, while S phase nucleoli were almost entirely free of Sirt6. During mitosis, the Sirt6 expression level was increased, and while Sirt6 was not associated with condensed chromosomes, it partially co-localized with mitotic spindles. Cells overexpressing Sirt6 had a lower proliferation rate with a lower percentage of cells in mitosis. These findings suggest roles for Sirt6 in the nucleolus and in the mitotic phase of the cell cycle.
Pooneh Memar Ardestani; Fengyi Liang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-29
Journal Detail:
Title:  Nucleus (Austin, Tex.)     Volume:  3     ISSN:  1949-1042     ISO Abbreviation:  Nucleus     Publication Date:    2012 Sep-Oct
Date Detail:
Created Date:  2012-10-02     Completed Date:  2013-02-22     Revised Date:  2014-10-10    
Medline Journal Info:
Nlm Unique ID:  101518322     Medline TA:  Nucleus     Country:  United States    
Other Details:
Languages:  eng     Pagination:  442-51     Citation Subset:  IM    
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MeSH Terms
Amino Acid Sequence
Cell Nucleus / metabolism
Chromosomes / metabolism
G1 Phase
HeLa Cells
Molecular Sequence Data
Sirtuins / analysis,  metabolism*
Reg. No./Substance:
EC 3.5.1.-/SIRT6 protein, human; EC 3.5.1.-/Sirtuins

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