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Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins

ABSTRACT: This SuperSeries is composed of the following subset Series: GSE39579: Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (Chip-Seq data) GSE39580: Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (expression data) Refer to individual Series

ORGANISM(S): Homo sapiens

SUBMITTER: Iouri Chepelev

PROVIDER: E-GEOD-39581 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (Chip-Seq data)

Project description:Background: Histone post-translational modifications (PTMs) constitute a branch of epigenetic mechanisms that can control the expression of eukaryotic genes in a heritable manner. Recent studies have identified several PTM-binding proteins containing diverse specialized domains whose recognition of specific PTM sites leads to gene activation or repression. Here, we present a high-throughput proteogenomic platform designed to characterize the nucleosomal make-up of chromatin enriched with a set of histone PTM-binding proteins known as histone PTM readers. We support our findings with gene expression data correlating to PTM distribution. Results: We isolated human mononucleosomes bound by the bromodomain-containing proteins Brd2, Brd3 and Brd4, and by the chromodomain-containing heterochromatin proteins HP1alpha and HP1beta. Histone PTMs were quantified by mass spectrometry (ChIP-qMS), and their associated DNAs were mapped using deep sequencing. Our results reveal that Brd- and HP1-bound nucleosomes are enriched in histone PTMs consistent with actively transcribed euchromatin and silent heterochromatin, respectively. Data collected using RNA-Seq (GSM301568) show that Brd-bound sites correlate with highly expressed genes. In particular, Brd3 and Brd4 are most enriched on nucleosomes located within HOX gene clusters, whose expression is reduced upon Brd4 depletion by shRNA. Conclusions: Proteogenomic mapping of histone PTM readers, alongside the characterization of their local chromatin environments and transcriptional information, should prove useful for determining how histone PTMs are bound by these readers and how they contribute to distinct transcriptional states. Examination of Brd and HP1 proteins-binding sites in HEK293 cells.

2012-07-31 | E-GEOD-39579 | biostudies-arrayexpress

Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (expression data)

Project description:Background: Histone post-translational modifications (PTMs) constitute a branch of epigenetic mechanisms that can control the expression of eukaryotic genes in a heritable manner. Recent studies have identified several PTM-binding proteins containing diverse specialized domains whose recognition of specific PTM sites leads to gene activation or repression. Here, we present a high-throughput proteogenomic platform designed to characterize the nucleosomal make-up of chromatin enriched with a set of histone PTM-binding proteins known as histone PTM readers. We support our findings with gene expression data correlating to PTM distribution. Results: We isolated human mononucleosomes bound by the bromodomain-containing proteins Brd2, Brd3 and Brd4, and by the chromodomain-containing heterochromatin proteins HP1alpha and HP1beta. Histone PTMs were quantified by mass spectrometry (ChIP-qMS), and their associated DNAs were mapped using deep sequencing. Our results reveal that Brd- and HP1-bound nucleosomes are enriched in histone PTMs consistent with actively transcribed euchromatin and silent heterochromatin, respectively. Data collected using RNA-Seq (GSM301568) show that Brd-bound sites correlate with highly expressed genes. In particular, Brd3 and Brd4 are most enriched on nucleosomes located within HOX gene clusters, whose expression is reduced upon Brd4 depletion by shRNA. Conclusions: Proteogenomic mapping of histone PTM readers, alongside the characterization of their local chromatin environments and transcriptional information, should prove useful for determining how histone PTMs are bound by these readers and how they contribute to distinct transcriptional states. Comparison of Brd2 and HP1b shRNA knockdown HEK293 cells to control knockdown HEK293 cells.

2012-07-30 | E-GEOD-39580 | biostudies-arrayexpress

Project description:Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins

| PRJNA171161 | ENA

The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts

Project description:This SuperSeries is composed of the following subset Series: GSE38356: The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts [RNA-seq] GSE38201: The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts [PAR-CLIP] GSE38355: The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts [protein occupancy profiling] Refer to individual Series

2012-05-31 | E-GEOD-38157 | biostudies-arrayexpress

Chip-seq mapping of active chromatin marks in BRD4-NUT and different NMC cells

Project description:BRD4-NUT megadomains is an order of magnitude larger than super-enhancer regions and displays a more continuously enriched profile rather than appearing as a cluster of individual peaks. Chip-seq mapping of active chromatin marks in BRD4-NUT and different NMC cells

2015-07-14 | E-GEOD-70870 | biostudies-arrayexpress

Homo sapiens

Project description:Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (expression data)

| PRJNA171164 | ENA

Homo sapiens

Project description:Proteo-Genomic Characterization and Mapping of Nucleosomes Decoded by Brd and HP1 Proteins (Chip-Seq data)

| PRJNA171165 | ENA

Integrative AUF1 PAR-CLIP analysis uncovers AUF1 roles in translation and genome integrity (PAR-CLIP)

Project description:We report that AUF1 modulates global mRNA stability and translation, in turn promoting the maintenance of DNA integrity. Please see individual series. In short, for AUF1 PAR-CLIP, the four isoforms of AUF1 (p37, p40, p42, and p45) tagged with a Flag epitope were expressed in HEK293 cells. For total RNA-Seq HEK293 cells were transfected with Control siRNA, AUF1 siRNA, Empty Vector, Flag-AUF1 p37, p40, p42, or p45 as well as WI-38 cells were collected at PDL 15 and 55 and also transfected with Control siRNA, AUF1 siRNA, HuR siRNA. For Ribo-Seq HeLa cells were transfected with Control siRNA, AUF1 siRNA, or HuR siRNA.

2014-11-05 | E-GEOD-52971 | biostudies-arrayexpress

The HP1 protein interactome of mouse embryonic stem cells

Project description:The family of Heterochromatin Protein 1 (HP1) consists of highly conserved proteins, which have important functions in the nucleus of eukaryotic cells. In mammals there are three HP1 paralogs: HP1(alpha), Hp1(beta), and Hp1(gamma)They are encoded by the Cbx5, Cbx1, and Cbx3 genes, respectively. Hp1 and Hp1 stably interact with Chd4 and Adnp to form the ChAHP complex. In this project, Chd4, Adnp, and the three Cbx genes were endogenously tagged with a FLAG-Avi tag in mouse embryonic stem cells. The tagged proteins were subjected to tandem-affinity purification and analysis by mass spectrometry.

2018-05-22 | PXD006226 | Pride

Genome-wide analysis of pre-mRNA 3' end processing reveals a decisive role of human cleavage factor I in the regulation of 3' UTR length: CLIP

Project description:Through alternative polyadenylation, human mRNAs acquire longer or shorter 3' untranslated regions, the latter typically associated with higher transcript stability and increased protein production. To understand the dynamics of polyadenylation site usage, we mapped transcriptome‐wide both binding sites of 3' end processing factors CPSF‐160, CPSF‐100, CPSF‐73, CPSF‐30, Fip1, CstF‐64, CstF-64tau, CF Im25, CF Im59, and CF Im68 and 3' end processing sites in HEK293 cells. We found that although binding sites of these factors generally cluster around the poly(A) sites most frequently used in cleavage, CstF‐64/CstF-64tau and CF Im proteins have much higher positional specificity compared to CPSF components. Knockdown of CF Im68 induced a systematic use of proximal polyadenylation sites, indicating that changes in relative abundance of a single 3' end processing factor can modulate the length of 3' untranslated regions transcriptome-wide, and suggesting a mechanism behind the previously observed increase in tumor cell invasiveness upon CF Im68 knockdown. We performed PAR-CLIP experiments for 3' end processing factors including CPSF-30, CPSF-73, CPSF-100, CPSF-160, Fip1, CF Im25, CF Im59, CF Im68, CstF-64, and CstF-64tau.

2012-05-15 | E-GEOD-37398 | biostudies-arrayexpress

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