Genome-wide maps of O-GlcNAc-Oct4 binding regions in ZHBTc4 F-Oct4 mouse embryonic stem cells
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE36388 | GEO | 2012/08/27
SECONDARY ACCESSION(S): PRJNA153273
REPOSITORIES: GEO
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Project description:We report that Oct4 is modified by O-GlcNAc in stem cells. To find O-GlcNAc-Oct4 target genes, we ChIPed Oct4 with Flag(Oct4) antibody and then O-GlcNAc modified proteins are enriched by sWGA beads (succinylated wheat germ agglutinin (sWGA), which specifically binds O-GlcNAc). Results show that several genes implicated in pluripotency regulation are bound by O-GlcNAc-Oct4 in their gene region. 2 samples examined: Control (ChIP with anti-Flag(Oct4) and then reChIP with IgG), O-GlcNAc-Oct4 (ChIP with anti-Flag (Oct4) and then reChIP with sWGA)
2012-08-27 | E-GEOD-36388 | biostudies-arrayexpress
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Project description:We developed a strategy to map GlcNAc modified proteins based on a chemical chromatin precipitation strategy. Drosophila S2 cells, as well as wild type (wt) and sxc null pupae, were fed with 100 uM Ac4GalNAz and the resulting DNA was cross-linked, sonicated, and purified. DNA strands cross-linked to GlcNAz proteins were isolated by congugating with alkyn-biotin by Staudinger ligation followed by streptavidin purification. The resulting DNA was constructed into libraries for sequencing. To asses the robustness of our strategy, we compared GalNAz ChIP-seq results in S2 cells with two other GlcNAc ChIP-seq strategies, using a mutant β-1,4-galactosyltransferase (GalT) and the lecting wheat germ agglutinin (WGA). Briefly, GalT was incubated with cross-linked, sonicated and purified DNA along with UDP-GalNAz. Ligation to biotin with click chemistry followed by streptavidin purification resulted in library ready material. For WGA and Pho ChIP-seq, cross-linked and purified DNA was incubated with pho antibody or WGA resin and purified followed by library preperation.
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Project description:We use ChIP-Seq technology to profile the occupancy of histone H2A.Z and its chaperone in HeLa cells genome wide to check if they are co-colocalized. H2A.Z is ChIPed by antibody and its chaperone is tagged by Flag and ChIPed by M2 beads against Flag. ChIPed fragments are sequenced by Illumina HiSeq 2000 platform.
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Project description:Tissue fibrosis is induced by chronic inflammation accompanied by repeated injuries. Chronic inflammation alters fibroblasts and stellate cells, maintaining the tissues in myofibroblasts and activating stellate cells. This activation promotes the augmentation of these cells and the abundant production of extracellular matrices, such as collagen. Fibrotic tissue dysfunction is eventually induced by expelling parenchymal cells with these abundant collagen depositions. To recover from tissue fibrosis, the activation of myofibroblasts and stellate cells is suppressed by selectively targeting these cells. Here we show that O-N-acetylglucosamine (GlcNAc)-modified proteins leaked from dead cells and GlcNAc-bearing polymers mimicking the GlcNAc moiety of these proteins suppress the activation of these cells; administration of the GlcNAc-bearing polymer into carbon tetrachloride-treated mice can improve liver fibrosis. We found that a multivalent GlcNAc moiety structure elicited antifibrotic activities in myofibroblasts by interacting with cell surface vimentin and desmin. Therefore, since these cells highly express cytoskeletal proteins, vimentin and desmin, on the cell surface and have GlcNAc-binding activity, we suggest that O-GlcNAc-modified proteins leaked from dead cells can function as suppressors of fibrosis and hyperplasia in spontaneous recovery. Moreover, we anticipate that GlcNAc-bearing polymers mimicked by O-GlcNAc-modified proteins will be useful as new therapeutic tools for fibrosis and hyperplasia.
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Project description:We set out to develop an unbiased, genome-wide method to screen for proteins that locate to the OCT4 proximal enhancer (PE) in hESCs; for this purpose, we developed an optimized locus-specific proteomics approach in hESCs. First, we designed TALEN (Transcription Activator-Like Effector Nuclease) constructs to target the sequences that are near the OCT4 PE, located in a region of DNaseI hypersensitivity. TALEN constructs with the highest cutting efficiency were chosen for locus-specific proteomics. We then made modifications to the original TALEN protein to transform it into a catalytically-dead TALE (dTALE) protein that is optimized for locus-specific proteomics in hESCs via three steps: 1) The nuclease-domain FokI at the C-terminus was replaced by a GFP (green fluorescence protein); 2) a 3X FLAG tag at the N-terminus was included for following pull-down analysis; 3) the existing CMV promoter was replaced with an EF1alpha promoter that has robust expression in hESCs. This dTALE protein could then be chemically crosslinked to the OCT4 locus together with all the other proteins that bind to the locus. We verified that dTALE protein binds to the targeted locus by chromatin immunoprecipitation (ChIP)-qPCR. Following crosslinking, chromatin was sheared, and all the associated proteins were immunoprecipitated using an anti-FLAG antibody. Immunoprecipitation pulled down the dTALE protein as well as other proteins and complexes that are also attached to that region. Crosslinking was then reversed, and the samples were subjected to mass spectrometry to enable generation of a list of proteins that potentially bind to OCT4 PE locus.
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Project description:We used a metabolic labeling (GalNAz) based O-GlcNAc sites identification and quantification proteomics method to compare the O-GlcNAc chromatin of MCF-7 and MCF-7/ADR cells. The O-GlcNAc chromatin-associated proteins can be metabolically labeled with azides, followed by reaction with a cleavable DADPS (dialkoxydiphenylsilane) alkyne-biotin linker and enrichment with streptavidin beads. After cleavage of DADPS by formic acid, O-GlcNAc modified peptides were quantitative analysis using tandem mass spectroscopy (MS).
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Project description:To identify SET1A genome-wide occupancy and further unveil its role in transcriptional regulation in mouse ES cells, we carried out chromatin immunoprecipitation followed by high sequencing (ChIP-seq).We established a stable ES cell line expressing 2X Flag tagged SET1A and performed ChIP with anti-Flag M2 beads, followed by deep sequencing. We found that the SET1A peaks show an outstanding enrichment in promoter region. Importantly, these SET1A binding loci revealed a clear co-localization with OCT4, and high H3K4me3 level, which is consistent with its interaction with OCT4 and intrinsic H3K4 methylase activity.
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