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ABSTRACT:
PROVIDER: PRJNA549693 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:To identify direct transcriptional targets of RFX6, we performed chromatin immunoprecipitation of HA epitope tagged RFX6 followed by massively parallel DNA sequencing (ChIP-seq). Using CRISPR/Cas9 gene editing, the HA epitope was inserted into the 3' end of the RFX6 gene in H9 hESC. Pluripotent cells were then differentiated into PDX1+RFX6+ pancreatic progenitors and endogenous RFX6-HA was immunoprecipitated with an anti-HA antibody. To eliminate background signal caused by non-specific antibody binding, a control experiment using wild-type H9 hESC was performed in parallel.
2020-10-23 | E-MTAB-9335 | biostudies-arrayexpress
Project description:Cornelia de Lange syndrome (CdLS) is an autosomal dominant disease mainly caused by mutations in the Nipped-B-like protein (NIPBL) gene resulting in the alteration of the cohesin pathway. Here, we generated human induced pluripotent stem cells (hiPSCs) from a CdLS patient carrying a mutation in the NIPBL gene, c.5483G>A, and tested CRISPR-Cas based approaches to repair the genetic defect. We applied an efficient and precise method of gene correction through CRISPR-Cas induced homology directed repair (HDR), which allowed the generation of hiPSC clones with regular karyotype and preserved stemness. The efficient and precise gene replacement strategy developed in this study can be extended to the modification of other genomic loci in hiPSCs. Isogenic wild-type and mutated hiPSCs produced with the CRISPR-Cas technology are fundamental CdLS cellular models to study the disease molecular determinants and identifying therapeutic targets.
2023-03-17 | E-MTAB-11604 | biostudies-arrayexpress
Project description:CRISPR-Cas immune systems function to defend prokaryotes against potentially harmful mobile genetic elements including viruses and plasmids. The multiple CRISPR-Cas systems (Types I, II, III) each recognize and target destruction of foreign invader nucleic acids via structurally and functionally diverse effector complexes (crRNPs). CRISPR-Cas effector complexes are comprised of CRISPR RNAs (crRNAs) that contain sequences homologous to the invading nucleic acids and Cas proteins specific to each immune system type. We have previously characterized a crRNP in Pyrococcus furiosus (Pfu) that contains Cmr proteins (Type III-B) associated with one of two primary size forms of crRNAs and functions through homology-dependent cleavage of target RNAs. In the current study, we have isolated and characterized two additional native Pfu CRISPR-Cas complexes containing either Csa (Type I-A) or Cst (Type I-G) proteins and distinct profiles of associated crRNAs. For each complex, the Cas proteins were identified by tandem mass spectrometry and immunoblotting and the crRNAs by RNA deep sequencing and Northern blot analysis. The crRNAs associated with both the Csa and Cst complexes originate from each of seven total CRISPR loci and contain identical 5’ ends (8-nt CRISPR RNA repeat-derived 5’ tag sequences) but heterogeneous 3’ ends (containing variable amounts of downstream repeat sequences). These crRNA forms are distinct from Cmr-associated crRNAs, indicating different 3’ end processing pathways following primary cleavage of common pre-crRNAs. We predict that the newly identified Pfu Type I-A (Csa) and Type I-G (Cst)-containing crRNPs, like other previously characterized Type I CRISPR-Cas effector complexes, each function by carrying out crRNA-guided DNA targeting of invading mobile genetic elements. Taken together, our in-depth characterization of the three isolated native complexes provides clear evidence for three compositionally distinct crRNPs containing either Cmr, Csa, or Cst Cas proteins that together make up an impressive arsenal of CRISPR-Cas defense for a single organism. 4 Samples: Protein-associated small RNAs
2015-07-10 | E-GEOD-65781 | biostudies-arrayexpress
Project description:CRISPR loci are found in bacterial and archaeal genomes where they provide the molecular machinery for acquisition of immunity against foreign DNA. In addition to the cas genes fundamentally required for CRISPR activity, a second class of genes is associated with the CRISPR loci, of which many have no reported function in CRISPR-mediated immunity. Here, we characterize MM_0565 of Methanosarcina mazei Gö1 associated to the type I-B CRISPR-locus providing evidence for its relevance in regulating this system. We show that MM_0565 is composed of a modified Rossmann-like fold and a winged helix-turn-helix domain and forms a dimer in solution. While direct effects on CRISPR-Cas transcription were not detected by genetic approaches, binding to the leader region of both CRISPR-Cas systems was observed by microscale thermophoresis and electromobility shift assays. Overexpression of MM_0565 however, strongly induced transcription of the cas1-solo gene located in the recently reported casposon, the gene product of which shows high similarity to classical Cas1 proteins. Based on our findings we hypothesize that Cas1-solo is involved in the adaptation of CRISPR-mediated immunity in M. mazei, and that MM_0565 modulates the activity of the CRISPR systems amongst potential other hypnotized actions by activating the transcription of the cas1-solo gene.
2020-09-08 | GSE151372 | GEO
Project description:Systematic investigation of transcription factor activity in the context of chromatin using massively parallel DNA binding and expression assays
| PRJNA357133 | ENA
Project description:Gene regulation occurs through trans-acting factors (e.g. transcription factors) acting on cis-regulatory elements (e.g. enhancers). Massively parallel reporter assays (MPRAs) functionally survey large numbers of cis-regulatory elements for regulatory potential, but do not identify the trans-acting factors that mediate any observed effects. Here we include preliminary data from a pilot transMPRA experiment — a reporter assay that efficiently combines multiplex CRISPR-mediated perturbation and MPRAs to identify trans-acting factors that modulate the regulatory activity of specific enhancers.
2020-09-30 | GSE157430 | GEO
Project description:Although CRISPR-Cas technology has revolutionized functional genomics_the systematic exploration of the role of individual exons for critical cellular phenotypes is lagging_limiting our understanding of genome regulation. To overcome this constraint_we have optimized and applied massively parallel exon deletion and splice site mutation screens in human cell lines identifying thousands of exons required for cell fitness. Fitness-promoting exons are enriched in essential and highly expressed genes and frequently overlap protein domains and interaction interfaces. In contrast_fitness-suppressing exons that are enriched in low-expressed_non-essential genes and tend to overlap intrinsically disordered regions. In-depth mechanistic investigation of a screen hit_TAF5 alternative exon-8_reveals that its inclusion controls the assembly of the TFIID general transcription initiation complex regulating gene expression outputs. Collectively_by applying orthogonal exon perturbation screening strategies we have generated a resource of phenotypically important exons and uncovered mechanisms that control gene expression and cell fitness.
2024-06-24 | GSE244373 | GEO
Project description:We employed CRISPR/Cas-mediated genome editing to generate S2 cell lines expressing GFP-tagged dCoREST, dL(3)mbt, dLSD1 and dG9a, respectively. This allowed us to determine the genome-wide binding profiles for these proteins by ChIP-seq using the same antibody (anti-GFP) in each case.
2019-11-04 | E-MTAB-8341 | biostudies-arrayexpress
Project description:CRISPR-Cas constitutes an adaptive prokaryotic defence system against invasive nucleic acids like viruses and plasmids. Beyond their role in immunity, CRISPR-Cas systems have been shown to closely interact with components of cellular DNA repair pathways either by regulating their expression or via direct protein-protein contact or enzymatic activity. The integrase Cas1 is usually involved in the adaptation phase of CRISPR-Cas immunity but its function in cellular DNA repair pathways has been proposed before. Here, we analysed the capacity of an archaeal Cas1 from Haloferax volcanii to compensate DNA damage induced by oxidative stress and found that a deletion of the cas1 gene led to severe growth defects after stress induction. In addition, our results indicate that Cas1 is directly involved in DNA damage repair as the enzymatically active site of the protein is crucial for growth rescue under oxidative conditions. Based on biochemical cleavage assays, we propose a mechanism in which Cas1 exerts a similar function like the DNA repair protein Fen1 by resolving branched repair intermediate structures. Overall, the present study broadens our understanding of the functional link between CRISPR-Cas immunity and DNA repair by demonstrating that Cas1 and Fen1 display commutable roles during archaeal DNA damage repair.
2022-05-20 | PXD029952 | Pride