Genome-wide H3K56ac profiling after Sirt6 knockdown in mESCs [ChIP-seq]
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PROVIDER: PRJNA706939 | ENA |
REPOSITORIES: ENA
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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-wide H3K56ac profiling in the absence of Sirt6 in MuSCs and mouse embryonic stem cells (mESCs) using high throughput sequencing (ChIP-seq).
2022-05-13 | GSE168331 | GEO
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-wide H3K56ac profiling in the absence of Sirt6 in MuSCs and mouse embryonic stem cells (mESCs) using high throughput sequencing (ChIP-seq).
2022-05-13 | GSE168330 | GEO
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).
2022-05-13 | GSE168329 | GEO
Project description:Chromatin remodeling proteins are frequently dysregulated in human cancer, yet little is known about how they control tumorigenesis. Here, we uncover an epigenetic program mediated by the NAD+-dependent histone deacetylase Sirtuin 6 (SIRT6) that is critical for suppression of pancreatic ductal adenocarcinoma (PDAC), one of the most lethal malignancies. SIRT6 inactivation accelerates PDAC progression and metastasis via upregulation of Lin28b, a negative regulator of the let-7 microRNA. SIRT6 loss results in histone hyperacetylation at the Lin28b promoter, Myc recruitment, and pronounced induction of Lin28b and downstream let-7 target genes, HMGA2, IGF2BP1 and IGF2BP3. This epigenetic program defines a distinct subset representing 30-40% of human PDAC, characterized by poor prognosis and an exquisite dependence on Lin28b for tumor growth. Thus, we identify SIRT6 as an important PDAC tumor suppressor, and uncover the Lin28b pathway as a potential therapeutic target in a molecularlydefined PDAC subset. ChIP-Seq experiments to examine H3K56ac histone modifications in murine PDAC cells that are Sirt6 wild type (WT), Sirt6 knock-out (KO), and Sirt6 KO cells engineered to express Sirt6 WT (Sirt6 KO + Sirt6 WT Restored).
2016-04-01 | E-GEOD-79503 | biostudies-arrayexpress
Project description:Purpose: The complete understanding of how genetic and epigenetic components control beta cell differentiation and function is key to the discovery of novel therapeutic approaches to prevent beta cell dysfunction and failure in the progression of type 2 diabetes. Our goal was to elucidate the role of histone deacetylase SIRT6 in beta-cell development and homeostasis. Methods: The Sirt6 endocrine progenitor cell conditional knockout (EKO) and beta-cell-specific knockout (BKO) mice were generated using the Cre-loxP system. Mice were assayed for islet morphology, glucose tolerance, glucose-stimulated insulin secretion, and susceptibility to streptozotocin. Transcriptional regulatory functions of SIRT6 in primary islets were evaluated by RNA-seq analysis. RT-qPCR and immunoblot were used to verify and investigate the gene expression changes. Chromatin occupancies of SIRT6, H3K9Ac, H3K56Ac, and active RNA Polymerase II were evaluated by chromatin immunoprecipitation. Results: Deletion of Sirt6 in pancreatic endocrine progenitor cells did not affect endocrine morphology, beta cell mass, or insulin production, but did result in glucose intolerance and defective glucose-stimulated insulin secretion in mice. Conditional deletion of Sirt6 in adult beta cells reproduced the insulin secretion defect. Loss of Sirt6 resulted in aberrant upregulation of TXNIP. SIRT6 deficiency led to increased accumulations of H3K9Ac, H3K56Ac, and active RNA polymerase II at the promoter region of Txnip. SIRT6-deficient beta cells exhibited a time-dependent increase of H3K9Ac, H3K56Ac, and TXNIP levels. Furthermore, beta-cell-specific SIRT6 deficient mice showed increased sensitivity to streptozotocin. Conclusions: Our results reveal that SIRT6 suppresses Txnip expression in beta-cells via deacetylation of histone H3 and plays a critical role in maintaining beta-cell function and viability. Agents that preserve SIRT6 activity may be beneficial for preventing the progression of type 2 diabetes.
2017-12-21 | GSE104161 | GEO
Project description:Genome-wide H3K56ac profiling after Sirt6 inactivation in MuSCs [ChIP-seq]
| PRJNA706938 | ENA
Project description:H3K56ac is a target of SIRT6. So we measured the H3K56ac modifications in SIRT6 KO and control HSCs.
2018-02-04 | GSE77593 | GEO
Project description:Transcriptional regulation in eukaryotes commonly occurs at promoter-proximal regions wherein transcriptionally engaged RNA Polymerase II (Pol II) pauses before proceeding towards productive elongation. The roles of chromatin in this process remains poorly understood. Here, we demonstrate that the histone deacetylase SIRT6 regulates transcription elongation by binding to Pol II and anchoring the Negative ELongation Factor NELF, thereby preventing the release of Pol II towards elongation. Absence of SIRT6, or conditions of glucose deprivation, lead to increased levels of acetylated histone H3 at lysines 9 (H3K9ac) and 56 (H3K56ac), activation of the CDK9 kinase, phosphorylation of NELF and Pol II, and recruitment of the transcription factors MYC and BRD4, the PAF1 Complex, as well as several positive elongation factors, in turn releasing Pol II into productive elongation. Collectively, we identified SIRT6 as the first pausing-dedicated histone deacetylase, regulating intragenic H3K9ac and H3K56ac as critical chromatin modifications modulating transcriptional pausing and elongation.
2019-10-31 | GSE130689 | GEO
Project description:ATAC-seq and ChIP-seq studies after Sirt6 inactivation in MuSCs/mESCs
| PRJNA706934 | ENA
Project description:Transcriptional regulation in eukaryotes commonly occurs at promoter-proximal regions wherein transcriptionally engaged RNA Polymerase II (Pol II) pauses before proceeding towards productive elongation. The roles of chromatin in this process remains poorly understood. Here, we demonstrate that the histone deacetylase SIRT6 regulates transcription elongation by binding to Pol II and anchoring the Negative ELongation Factor NELF, thereby preventing the release of Pol II towards elongation. Absence of SIRT6, or conditions of glucose deprivation, lead to increased levels of acetylated histone H3 at lysines 9 (H3K9ac) and 56 (H3K56ac), activation of the CDK9 kinase, phosphorylation of NELF and Pol II, and recruitment of the transcription factors MYC and BRD4, the PAF1 Complex, as well as several positive elongation factors, in turn releasing Pol II into productive elongation. Collectively, we identified SIRT6 as the first pausing-dedicated histone deacetylase, regulating intragenic H3K9ac and H3K56ac as critical chromatin modifications modulating transcriptional pausing and elongation.
2019-10-31 | GSE130691 | GEO