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PRO-seq in control and H3.3 K4A mutant mESCs

ABSTRACT: PRO-seq in control and H3.3 K4A mutant mESCs

PROVIDER: PRJEB35815 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR3763016.fastq.gz	Fastqsanger.gz
	ERR3763017.fastq.gz	Fastqsanger.gz
	ERR3763018.fastq.gz	Fastqsanger.gz
	ERR3763019.fastq.gz	Fastqsanger.gz

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PRO-seq in control and H3.3 K4A mutant mESCs

Project description:Study to investigate the role of histone residues H3K4 and H3K36 for gene expression, histone localization and neuronal lineage specification by mutation of K4 and K36 in H3.3 to alanine. Histone variant H3.3 differs from the canonical H3.1/H3.2 by only 4 to 5 amino acids, which are necessary for nucleosome assembly independent of DNA replication, and is encoded by two gene copies. Complete loss of the two H3.3 genes (H3f3a and H3f3b) leads to embryonic lethality while single gene knockout yields viable mice. We used CRISPR-Cas9 to delete H3f3a and introduce homozygous point-mutations into H3f3b, thus ensuring that the entire pool of H3.3 protein carries the mutation of interest. We differentiated H3.3ctrl (H3f3a knock-out; H3f3b wild type), H3.3K4A mutant (H3f3a knock-out; H3f3b K4A) and H3.3K36A mutant (H3f3a knock-out; H3f3b K36A) ESCs into glutamatergic neurons. To assess the effect of the K4A mutation on Pol II activity, nascent RNA levels were mesaured by PRO-seq.

2020-01-28 | E-MTAB-8617 | biostudies-arrayexpress

PRO-seq (Precision Run-On sequencing) to profile nascent RNA of H3.3 mutant (K9A; K27A; K79A) and control mESCs

Project description:Mouse embryonic stem cells (i.e., mESCs; line ESC 129-B13) were genetically modified using CRISPR-Cas9 to mutate the H3f3b locus, in order to carry homozygous lysine-to-alanine substitution of residues K9 or K27. Two control mESC lines carrying knock-out of the H3f3a gene were used as background for the editing. To profile nascent RNA levels in H3.3 mutant and control mESCs, two rounds of PRO-seq experiment were performed. In the first round, three replicates each of H3.3K9A and control (i.e., Ctrl_9) mESCs were used. In the second round, two replicates each of H3.3K27A and control (i.e., Ctrl_27) mESCs were used. After permeabilization of the mESCs (and addition of 5% Drosophila S2 cells spike-in), a 2 biotin run-on reaction using biotin-11-UTP and biotin-11-CTP was carried out to label nascent transcripts. Biotinylated nascent RNA was then enriched as part of the library preparation process. Sequencing was performed on a NextSeq500 platform in single-end mode (75bp reads). The experiment allows for an assesment of the changes in the activity of cis-regulatory elements, upon removal of H3.3 K9 or K27 residues.

2024-09-04 | E-MTAB-12869 | biostudies-arrayexpress

mRNA-seq of H3.3 mutant (K9A K27A K79A) and control mESCs

Project description:mRNA-seq of H3.3 mutant (K9A K27A K79A) and control mESCs

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mRNA-seq of H3.3 mutant (K9A; K27A; K79A) and control mESCs

2024-03-09 | E-MTAB-12866 | biostudies-arrayexpress

PRO-seq (Precision Run-On sequencing) to profile nascent RNA of H3.3 mutant (K9A K27A K79A) and control mESCs

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ChIP-seq for histone modifications and chromatin factors in H3.3 mutant (K9A; K27A; K79A) and control mESCs

Project description:Mouse embryonic stem cells (i.e., mESCs; line ESC 129-B13) were genetically modified using CRISPR-Cas9 to mutate the H3f3b locus, in order to carry homozygous lysine-to-alanine substitution of residues K9, K27 or K79. Two control mESC lines carrying knock-out of the H3f3a gene were used as background for the editing. Chromatin immunoprecipitation followed by sequencing (ChIP-seq) was performed to profile the changes in histone modifications, in the different H3.3 mutant mESC lines. The following histone modifications were profiled: H3K27ac (39685, Active Motif), H3K9ac (C5B11-9649, Cell Signalling Technology), H3K27me3 (C36B11, Cell Signalling Technology), H3K9me2 (D85B4, Cell Signalling Technology), H3K9me3 (D4W1U, Cell Signalling Technology). H3.3 (09-838, Merck-Millipore, purified polyclonal) ChIP-seq was performed in order to profile the deposition of this histone variant in the H3.3 K9A and K27A mESC mutant lines. SUZ12 (D39F6-3737, Cell Signalling Technology) ChIP-seq was performed to profile the genomic distribution of the Polycomb repressive complex 2 (i.e., PRC2). Two to three independent replicates per condition were grown and harvested for each ChIP experiment. Matched input controls were also generated in every experiment. Sequencing libraries were prepared using the NEBNext Ultra II library preparation kit (New England Biolabs) and sequenced on NextSeq500 or NextSeq2000 platforms in single-end mode.

2024-03-09 | E-MTAB-12868 | biostudies-arrayexpress

ChIP-seq for histone modifications and chromatin factors in H3.3 mutant (K9A K27A K79A) and control mESCs

Project description:ChIP-seq for histone modifications and chromatin factors in H3.3 mutant (K9A K27A K79A) and control mESCs

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Aberrant DNA repair reveals a vulnerability in histone H3.3-mutant brain tumors

Project description:Pediatric high-grade gliomas (pHGG) are devastating and incurable brain tumors with recurrent mutations in histone H3.3. These mutations promote oncogenesis by dysregulating gene expression through alterations of histone modifications. We identify aberrant DNA repair as an independent mechanism, which fosters genome instability in H3.3 mutant pHGG, and opens new therapeutic options. The two most frequent H3.3 mutations in pHGG, K27M and G34R, drive aberrant repair of replication-associated damage by non-homologous end joining (NHEJ). Aberrant NHEJ is mediated by the DNA repair enzyme Polynucleotide Kinase 3'-Phosphatase (PNKP), which shows increased association with mutant H3.3 at damaged replication forks. PNKP sustains the proliferation of cells bearing H3.3 mutations, thus conferring a molecular vulnerability, specific to mutant cells, with potential for therapeutic targeting.

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Methylation levels in H3.3 mutant hematopoietic stem cells.

Project description:Reduced Representation Bisulfite Sequencing for mouse in vivo hematopoietic stem cells, 3 conditions: wildtype, expressing dominant negative mutant H3.3 at lysine 9 (K9M) or dominant negative H3.3 at lysine 36 (K36M).

2019-10-07 | GSE123676 | GEO

Histone H3.3 lysine 9 and 27 control repressive chromatin states at cryptic cis-regulatory elements and bivalent promoters in mouse embryonic stem cells

Project description:Histone modifications are associated with distinct transcriptional states, but it is unclear whether they instruct gene expression. To investigate this, we mutated histone H3.3 K9 and K27 residues in mouse embryonic stem cells (mESCs). Here, we find that H3.3K9 is essential for controlling specific distal intergenic regions and for proper H3K27me3 deposition at promoters. The H3.3K9A mutation resulted in decreased H3K9me3 at regions encompassing endogenous retroviruses and induced a gain of H3K27ac and nascent transcription. These changes in the chromatin environment unleashed cryptic enhancers, resulting in the activation of distinctive transcriptional programs and culminating in protein expression normally restricted to specialized immune cell types. The H3.3K27A mutant disrupted deposition and spreading of the repressive H3K27me3 mark, particularly impacting bivalent genes with higher basal level of H3.3 at promoters. Therefore, H3.3K9 and K27 crucially orchestrate repressive chromatin states at cis-regulatory elements and bivalent promoters, respectively, and instruct proper transcription in mESCs.

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