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Homo sapiens

ABSTRACT: Silencing of pericentric heterochromatin associated with SIRT6-dependent H3K18 deacetylation protects against mitotic errors and cellular senescence

PROVIDER: PRJNA286850 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2061340_1.fastq.gz	Fastqsanger.gz
	SRR2061340_2.fastq.gz	Fastqsanger.gz
	SRR2061350_1.fastq.gz	Fastqsanger.gz
	SRR2061350_2.fastq.gz	Fastqsanger.gz
	SRR2061341_1.fastq.gz	Fastqsanger.gz

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Silencing of pericentric heterochromatin associated with SIRT6-dependent H3K18 deacetylation protects against mitotic errors and cellular senescence

Project description:Pericentric heterochromatin silencing at mammalian centromeres is essential for mitotic fidelity and genomic stability. Defective pericentric silencing is observed in senescent cells, aging tissues, and mammalian tumors, but the underlying mechanisms and functional consequences of these defects are unclear. Here, we uncover a pivotal role of the human SIRT6 enzyme in pericentric transcriptional silencing, and this function protects against mitotic defects, genomic instability, and cellular senescence. At pericentric heterochromatin, SIRT6 promotes deacetylation of a new substrate, histone H3 lysine K18 (H3K18), and inactivation of SIRT6 in cells leads to H3K18 hyperacetylation and aberrant accumulation of pericentric transcripts. Strikingly, RNAi-depletion of these transcripts rescues the mitotic and senescence phenotypes of SIRT6-deficient cells. Together, our findings reveal a new function for SIRT6 and H3K18Ac regulation at heterochromatin, and demonstrate the pathogenic role of de-regulated pericentric transcription in aging- and cancer- related cellular dysfunction. H3K18ac, H3K9ac, H3K9me3, H3K56ac and Input ChIP-seq for U2OS cell

2016-04-04 | E-GEOD-69809 | biostudies-arrayexpress

Silencing of pericentric heterochromatin associated with SIRT6-dependent H3K18 deacetylation protects against mitotic errors and cellular senescence

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Epe1 recruits the BET family bromodomain protein Bdf2 to establish heterochromatin boundaries

Project description:Heterochromatin spreading leads to the silencing of genes within its path, and boundary elements have evolved to constrain such spreading. In fission yeast, heterochromatin at centromeres I and III is flanked by inverted repeats termed IRCs, which are required for proper boundary functions. However, the mechanisms by which IRCs prevent heterochromatin spreading are unknown. Here, we identified Bdf2, homologous to the mammalian BET family of double bromodomain proteins involved in diverse types of cancers, as a factor required for proper boundary function at IRCs. Bdf2 is enriched at IRCs through its interaction with the boundary protein Epe1. The bromodomains of Bdf2 recognize acetylated histone H4 tails and antagonize Sir2-mediated deacetylation of histone H4K16 to prevent heterochromatin spreading. Our results thus illustrate a mechanism of establishing chromosome boundaries at specific sites through the recruitment of a factor that protects euchromatic histone modifications. They also reveal a previously unappreciated function of H4K16 acetylation, which cooperates with H3K9 methylation to regulate heterochromatin spreading. Two samples, H4K16ac & Bdf2-Flag

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Project description:We found PEAT complexes mediate histone deacetylation and heterochromatin condensation and thereby facilitate heterochromatin silencing.

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The PEAT protein complexes are required for histone deacetylation and heterochromatin silencing [RNA-Seq]

Project description:We found PEAT complexes mediate histone deacetylation and heterochromatin condensation and thereby facilitate heterochromatin silencing.

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The PEAT protein complexes are required for histone deacetylation and heterochromatin silencing [ChIP-Seq]

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The PEAT protein complexes are required for histone deacetylation and heterochromatin silencing [BS-Seq]

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Histone deacetylation promotes transcriptional silencing at facultative heterochromatin

Project description:Histone deacetylation promotes transcriptional silencing at facultative heterochromatin

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Microarray of SIRT6 KO in hepatocellular carcinoma

Project description:We identified the specific role of Sirtuin 6 (SIRT6) in the progression of hepatocellular carcinoma (HCC) and evaluated its therapeutic and prognostic potential. SIRT6 knockdown by shRNA inhibited the proliferation of HCC cells; moreover, depletion of SIRT6 suppressed HCC tumor growth in vivo. SIRT6 silencing significantly down regulated the growth of HCC cell lines via induction of cellular senescence, which was attributed by DNA damage in p16/Rb and p53/p21-independent manners. We also showed that SIRT6 knockdown increased the number of G2/M phase arrested cells by increasing cyclin B1 and 14-3-3-∂. Moreover, SIRT6 levels were significantly higher in HCC cell lines than a normal hepatic cell line, and were higher in HCC than non-tumor tissues. Aberrant SIRT6 expression correlated with poor prognostic features of HCC. Taken together, our findings suggest SIRT6 may act as a tumor promoter by preventing cellular senescence attributed by DNA damage and suggests that targeting SIRT6 could be a promising therapeutic approach for cancer treatment.

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Genome-wide DNA accessibility maps after Sirt6 inactivation in muscle stem cells [ATAC-seq]

Project description:Sirt6, the NAD+-dependent deacetylase, has been described to deacetylate H3K9, H3K18, and H3K56. However, analysis of the acetylation status revealed that loss of Sirt6 caused a massive increase of histone H3K56ac levels but no detectable change of histone H3K9ac and H3K18ac, indicating that SIRT6 is the dominant deacetylase for H3K56ac in muscle stem cells (MuSCs). Further, we investigate genome transposase-accessible chromatin in the absence of Sirt6 in MuSCs using high throughput sequencing (ATAC-seq).

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