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We narrowed to 304 results for: cas9

Showing: 61 - 80 of 304 results

  1. What's New in CRISPR - December 2019

    Type
    Blog Post
    ...toolkit for epitope tagging Lentiviral capsid-based Cas9/gRNA ribonucleoprotein delivery Cytosine deaminase... a catalytically impaired Streptococcus pyogenes Cas9. They called this editor Target-ACE (adenine and...Read the paper in bioRxiv Find Target-ACE   CRISPR/Cas9-based toolkit for epitope tagging in neurons Harold... the paper in bioRxiv Find the ORANGE toolkit   Cas9/gRNA ribonucleoprotein delivery by lentiviral capsid-based...capsid-based bionanoparticle Transient expression of CRISPR/Cas9 in cells has advantages like reduced off-target ...off-target activity and decreased immune response to Cas9. Recently, Baisong Lu’s lab developed a lentiviral capsid-based...capsid-based bionanoparticle system for packaging Cas9/gRNA ribonucleoproteins for transient expression...

  2. An “elegans” Approach to Better CRISPR/Cas9 Editing Efficiency

    Type
    Blog Post
    ...co-conversion markers. Expanding beyond Cas9 Since the development of CRISPR/Cas9 editing methods, other Cas proteins...University of California, Santa Cruz. Emerging CRISPR/Cas9 editing technologies have transformed the palette...regulation during developmental processes, CRISPR/Cas9 allows us to delete sequences and introduce mutations...remain in the edited animal. Development of CRISPR/Cas9 editing strategies in C. elegans As brilliantly ...reported in 2017 uses the direct injection of a CRISPR/Cas9 ribonucleoprotein complex with linear DNA as repair...determined optimal PAM orientation for editing using two Cas9 targets. An orientation where the 5’ ends of the...efficiency suggesting that sperm are more permissive to Cas9 editing (Farboud et al., 2019). Work from the Mello...

  3. CRISPR 101: Cas9 Nickase Design and Homology Directed Repair

    Type
    Blog Post
    ...strands bluntly with WT Cas9 and one gRNA, you can create a staggered cut using a Cas9 nickase and two gRNAs...CRISPR nickase experiment Overview of Cas9 nickase We’ll use SpCas9 nickases as examples for this post. ...By mutating one of two Cas9 nuclease domains, researchers created the CRISPR nickase. Nickases create...targeting range: using an individual gRNA with WT Cas9, repair levels decrease rapidly 10 bp from the cut...The HDR efficiency compared favorably to using WT Cas9 with the left gRNA across the window. In a subsequent... this problem. D10A nickase outperformed both WT Cas9 sites tested by a wide margin, exhibiting >20% repair...adapted from an IDT webinar: Optimized methods to use Cas9 nickases in genome editing. For more information...

  4. The Advances Behind The World's First Personalized CRISPR Treatment

    Type
    Blog Post
    ... engineering Cas9 variants with a preference for specific PAMs. Though near-PAMless Cas9s can broadly ...editing was invented in David Liu’s lab by combining Cas9 DNA-targeting technology with a fused cytidine deaminase...effects in a variety of RNA transcripts independent of Cas9 targeting (Rees et al., 2019). The Liu lab characterized... and eight bases, close to the PAM recognized by Cas9. If no PAM is available nearby, a base editor may...Kleinstiver’s lab engineered new variants of S. pyogenes Cas9. While the wild-type enzyme requires a PAM sequence... models tested both the SpG and SpRY variants of Cas9. With many PAMs available, a large number of gRNAs...efficient editing. In these initial experiments, SpG Cas9 came out on top. Narrowing PAM preferences The Kleinstiver...

  5. What's New in CRISPR - September 2019

    Type
    Blog Post
    ...inducible CRISPR/Cas9 systems for transcriptional activation and genome editing by fusing Cas9 to a mutated...vectors to create knock-ins CasX Drug inducible CRISPR/Cas9 activation E. coli genome-wide inhibition library...vectors GeneWeld from Jeffrey Essner’s lab uses CRISPR/Cas9 and a donor vector to create knock-ins of fluorescent..., or transcriptional regulators. In this system, Cas9 generates a double-stranded DNA break at the genomic...Nucleic Acids Research Find the drug inducible Cas9 plasmids E. coli genome-wide inhibition library...factors, and identify sequence-specific toxicity of Cas9. Read the paper in Nature Communications Find.... The lab has previously used the library with SpdCas9 to perform pooled CRISPRi screens to identify essential...

  6. New Optimized Genome-wide CRISPRko, CRISPRi, and CRISPRa Libraries

    Type
    Blog Post
    ...combining specific sgRNAs with Cas9 or Cas9 derivatives. Unmodified Cas9 causes double stranded DNA breaks... loss of function while nuclease-deactivated Cas9 (dCas9) can be tethered to a repressor (CRISPRi) or ... issues. CRISPRi libraries utilize an engineered Cas9, which contains multiple point mutations in the ...resistance in A375 cells. The SAM system (CRISPR/Cas9 Synergistic Activation Mediator) uses an improved...improved activator design that consists of inactive Cas9-VP64, a sgRNA with two MS2 RNA aptamers, and the  ...Rational design of highly active sgRNAs for CRISPR-Cas9–mediated gene inactivation." Nature biotechnology...activity and minimize off-target effects of CRISPR-Cas9." Nature biotechnology 34.2 (2016): 184. PubMed ...

  7. CRISPR 101: Targeting RNA with Cas13a (C2c2)

    Type
    Blog Post
    ...Abudayyeh et al., 2016). In the endogenous CRISPR/Cas9 system, Cas9 uses both a tracrRNA and crRNA to facilitate... 27, 2020. CRISPR, and specifically Cas9 from S. pyogenes (SpCas9), is truly an exceptional genome engineering...Perhaps the biggest difference between Cas13a and Cas9 is that Cas13a binds and cleaves RNA rather than...enzymes - Cas13a contains two HEPN domains, whereas Cas9 uses HNH and RuvC domains to cleave target DNA. ...roles for HEPN domains in other proteins. As with Cas9, mutating key residues in the Cas13a molecule results... Guide RNA Target PAM (PFS) Cleavage Mechanism Cas9 HNH, RuvC TracrRNA, crRNA DNA 5' NGG Specific...conformational changes in the Cas13a molecule. Like Cas9, Cas13a tolerates single mismatches between the ...

  8. 3D Printing Meets CRISPR Cas9

    Type
    Blog Post
    ...shifts. This backbone model of Cas9 is based on Fuguo Jiang’s structure of Cas9 – primed for cleavage. This...contacted us in 2014 to ask if we could make a model of Cas9 based on the structure published by Martin Jinek...other aspects of the structure. While this first Cas9 model is certainly useful, it is also wrong in at... at least one serious way. We represented the Cas9 protein in a surface format made of rock-hard, inflexible... the amazing conformational flexibility that the Cas9 protein must have in order to scan along the double-stranded...model of a protein. We now have another model of Cas9 – a flexible alpha-carbon backbone model made of...reduce off-target hits in a rationally engineered Cas9 with improved specificity. Hold this flexible model...

  9. Transgenic Organisms, Cas9 Gene Drives, and Appropriate Safeguards

    Type
    Blog Post
    ...populations that already express Cas9 from an unlinked locus, while a Cas9+sgRNA drive targeting a synthetic...School. Scientists making transgenic organisms with Cas9 should be aware of the potential hazards of creating...caution. Why does making transgenic organisms with Cas9 risk creating a gene drive? The simplest way to ...last year2, delivering a DNA cassette encoding the cas9 gene and single guide RNAs (sgRNAs) with appropriate...easiest: don't use a DNA vector that encodes both Cas9 and sgRNA. What if I want to work with gene drives...sequence (save for the residual sgRNAs and possibly cas9 gene). An immunizing reversal drive is a variant...underlying advance enabling RNA-guided gene drives is Cas9 genome editing. Finally, gene drives are an inherently...

  10. CRISPR Plasmids - Tagging

    Type
    Collection
    ...pX330S-2-PITCh - expresses Cas9 & PITCh-gRNA pX330A-FBL/PITCh - expresses Cas9, PITCh-gRNA, & FBL-specific...Doyon lab, eSpCas9(1.1)_No_FLAG_AAVS1_T2 (Addgene #79888) , which expresses an untagged Cas9 AND a gRNA... consists of two components: A vector containing Cas9 and a validated gRNA, based on the Zhang lab's PX458...need to design and clone in a gRNA(s) to guide the Cas9 protein to your target sequence, as well as design...consists of two components: An all-in-one CRISPR/Cas9 vector based on the Zhang lab's PX330 , simultaneously... to generate both an expression cassette for the Cas9-programming sgRNA and HR donors for selectable genome...Editing Other Applications Purify Tag Visualize dCas9-FokI Screen Pooled Libraries gRNAs Empty gRNA Vectors...

  11. Back to Bacteria: CRISPR gRNA Multiplexing Using tRNAs

    Type
    Blog Post
    ...In the short time since its development, CRISPR/Cas9 genome editing has been used to study the effect...recombination. To further increase the utility of CRISPR/Cas9, it will be necessary to improve its multiplexing...construct size, it requires coexpression of Csy4 with Cas9 and the polycistronic transcript. As nucleases may... (15% and 9% of target sites.) How many loci can Cas9 modify? To test the application of this system to...-20% frequency at the four loci, indicating that Cas9 can be guided to at least 8 distinct loci. They ...standard pol III-gRNA, which will facilitate CRISPR/Cas9 multiplexing in systems with limited packaging capacity...afforded by PTGs will improve the utility of CRISPR/Cas9 in new avenues of research. The use of multiple ...

  12. Another Pathway into Cells: iTOP

    Type
    Blog Post
    ...would be compatible with CRISPR/Cas9 genome editing. Although CRISPR/Cas9 is all the rage, they had another... method and its potential applications to CRISPR/Cas9 genome editing.   Protein-only transduction? Niels...expression. Image courtesy of Diego D'Astolfo. CRISPR/Cas9: a potential application of iTOP Having tested iTOP...expression has a long-lasting effect, such as Cre- or Cas9-mediated recombination. Both primary hESCs and immortalized...cells treated with iTOP efficiently took up both Cas9 protein and a gRNA (yes, iTOP can also be used for... indicating that iTOP may be valuable for CRISPR/Cas9 stem cell editing. The small molecule NSDB... elements of iTOP. iTOP can be used to transduce Cas9 and a gRNA, which subsequently enter the nucleus...

  13. X-CHIME: Context Dependent Germline Knockout in Immune Cells

    Type
    Blog Post
    ... CHIME works through transduction of Cas9-expressing (Rosa26-Cas9) hematopoietic stem cells with a lentiviral...genes pXPR_219 Violet-excited GFP (vex) Rosa26-Cas9 I-CHIME Inducible knockout of a single gene...Violet-excited GFP (vex) Rosa26-FlpO-ERT2; H11-Cas9 L-CHIME Knocks out a single gene in defined... Violet-excited GFP (vex) Lineage-Cre; Rosa26-Cas9 S-CHIME Knocks out pairs of genes sequentially...Violet-excited GFP (vex) Rosa26-FlpO-ERT2; H11-Cas9 Table 1: X-CHIME systems Proof of Concept These...Haining, W. N., & Sharpe, A. H. (2019). A CRISPR-Cas9 delivery system for in vivo screening of genes in...

  14. What's New in CRISPR - May 2019

    Type
    Blog Post
    ...paper in Communications Biology Find the Cas9-PCV and PCV-Cas9 plasmids Selective curbing of unwanted ...Covalent tethering of DNA template to Cas9 SECURE base editors Nme2Cas9 CRISPR interference in Candida albicans... AAV delivery of Nme2Cas9 with gRNA cassette Erik Sontheimer’s lab identified a Cas9 protein from Neisseria...library Covalent tethering of DNA repair template to Cas9 Homology-directed repair (HDR) can be used to make...oligodeoxynucleotide HDR template covalently attached to the Cas9-gRNA RNP complex via the fused HUH endonuclease ...After testing dCas9 fusions with transcriptional repressors, they found that fusing dCas9 to an Mxi1 repressor...gene. Read the paper in mSphere Find the dCas9 and dCas9-Mxi1 plasmids If you have a new CRISPR tool...

  15. Controlling for Off-target Effects with a New Genome-wide CRISPR Screen Design

    Type
    Blog Post
    ...effects of gRNA and Cas9 expression, they fail to account for the effects of Cas9-induced dsDNA breaks... either stably expressed Cas9 or that had been lentiviral infected with Cas9. Validating the Library The...Genome-wide CRISPR/Cas9 screens are a high-throughput systematic approach for identifying genes involved.... Unanswered questions about genome-wide CRISPR/Cas9 screen design Are non-targeting guides an appropriate...single-guide studies? Many strategies exist for reducing Cas9 off-target effects, but most studies have focused...previously identified essential genes while previous Cas9 and shRNA library screens only identified  60% of...screen. This toxicity was used a proxy for detecting Cas9 cutting. Safe targeting guides better control for...

  16. 3 Tips to Improve HDR Efficiency for CRISPR Editing in Human Cells

    Type
    Blog Post
    ...at the Rockefeller University in NYC. The CRISPR/Cas9 system is a versatile tool for precise gene editing...organisms and model systems. We have used CRISPR/Cas9 extensively for the purpose of making sequence-specific...induced pluripotent stem cells (iPSCs). The CRISPR/Cas9 com­plex is very efficient at introducing double...Cas-blocking mutations After genome editing with CRISPR/Cas9 in human cells was described in 2013 (Cong et al...amounts of single cell clones. Furthermore, CRISPR/Cas9 editing is often bi-allelic, meaning that even if...systematically analyzed: introducing silent CRISPR/Cas9 blocking mutations in either the PAM (changing one...distance"  Even though we had controlled over-active Cas9 and repeated our experiments with blocking mutations...

  17. Behind-the-scenes of the Isolation of the Thermostable IgnaviCas9 From a Yellowstone Hot Spring

    Type
    Blog Post
    ...indicates that like GeoCas9 and ThermoCas9, IgnaviCas9 is a type II-C Cas9. IgnaviCas9 is most similar to...thermostable Cas9 enzymes have previously been characterized: GeoCas9 from the Doudna lab and ThermoCas9 from ...Find IgnaviCas9 here! What can you do with IgnaviCas9? Why would a thermostable Cas9 be useful? It can enable...launched in the Quake Lab. Identifying IgnaviCas9, a hyperthermostable Cas9 This year it was wonderful to learn... Ignavibacteriae phylum genome. IgnaviCas9 is a hyperthermostable Cas9 CRISPR nuclease that is active ... our CRISPR blog posts Read about GeoCas9, another thermostable Cas9 Resources on Addgene.org Read our... to a type II-C Cas9 from Parvibaculum lavamentivorans, whose optimal growth temperature is 30°C. Find...

  18. Prime Editing: Adding Precision and Flexibility to CRISPR Editing

    Type
    Blog Post
    ...prime editor consists of a Cas9 nickase fused to a reverse transcriptase. The Cas9 nickase is guided to the... that most Cas9-induced DSBs are repaired by non-homologous end joining. As a result, Cas9 treatment causes... ~ ~ ✓ ✓ ✓ R221K N394K Cas9 mutations Improve Cas9 nuclease activity ~ ~ ~ ~ ...homology to the genomic DNA locus. After nicking by Cas9, the homologous pegRNA sequence hybridizes to the...-MLV) reverse transcriptase to the C-terminus of Cas9 H840A nickase (PE1). But innovations by the Liu ...generate precise changes. However, the efficiency of Cas9 cleavage is relatively high while the efficiency...ratios of desired edits to indel byproducts than Cas9-initiated HDR. Prime editing tools Prime editing...

  19. CRISPR Methods for Bacteria: Genome Engineering, CRISPRa, CRISPRi, Base Editing, and More

    Type
    Blog Post
    ...pCRISPomyces-1 includes Cas9, a tracrRNA, and a CRISPR array, while pCRISPomyces-2 contains Cas9 and a gRNA cassette...functions more similarly to CRISPR/Cas9 systems adapted for eukaryotes in that Cas9-mediated cleavage induces ...targeting either a catalytically dead Cas9 (dCas9) alone or a dCas9 fused to the omega subunit of RNA polymerase... from Addgene consists of two plasmids: pCas9: carries Cas9 and chloramphenicol resistance pCRISPR: carries.... They identified the Cas9 orthologue from Streptococcus thermophilus, Cas9sth1 as a robust and highly...when using a nickase version of Cas9, but were also successful using a dCas9 variant as well. Furthermore...unsuccessful and the wild-type sequence persists, Cas9 will cleave the gene of interest, inducing a lethal...

  20. Pooled CRISPR Libraries Offer Genome-Wide Control for Large-Scale Functional Screens

    Type
    Blog Post
    ...Silvana Konermann, the first generation of CRISPR-Cas9 plasmids were not designed with gene activation ...question for her then was this: Can you engineer CRISPR-Cas9 activators that work well enough on any gene that...describe just such a system, which they call CRISPR/Cas9 Synergistic Activation Mediator or SAM. SAM is an... three components: 1. A nucleolytically inactive Cas9-VP64 fusion; 2. A sgRNA incorporating two MS2 RNA...system, Konermann explained, was new knowledge about Cas9’s crystal structure. “I thought maybe we could use...levels of control in the system. First of all, the Cas9s can be turned on and off, to reversibly activate...sam.genome-engineering.org/. Crystal structure of Cas9 in complex with guide RNA and target DNA. Nishimasu...
Showing: 61 - 80 of 304 results