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  1. Screening for Successful Genome Editing with Digital PCR

    Type
    Blog Post
    ...resulting from non-homologous end joining (NHEJ) (2-5), depending on your desired genome edit. Since exploitation...each sample can be quickly calculated (details in [2]) and can be used to quantify rates of mutation in... have been reported for mismatch nuclease assays (2, 6, 7). Ability to distinguish between mono-allelic...assays, in addition to testing their performance (2). Remember that although digital PCR is a great screening...PMID: 24509632. PubMed Central PMCID: PMC4063274. 2. Findlay, S. D., Vincent, K. M., Berman, J. R. & Postovit...5. Sedlak, R. H. et al. Digital detection of endonuclease mediated gene disruption in the HIV provirus...
  2. Multiplexed Capture of Promoter-enhancer 3D Chromatin Structures Using CRISPR

    Type
    Blog Post
    ...Originally published Dec 7, 2017 and updated Jul 2, 2020. Promoters may be the star of gene regulation...sequence targeted in the experiment. Figure 2: Comparing CAPTURE and CAPTURE 2.0.     Original...cell line expressing 1) FLAG-biotin-tagged dCas9, 2) BirA, and 3) one or more gRNAs Two separate lentiviruses...delivering 1) a BioTAP-tagged dCas9 and an eGFP tag, and 2) gRNAs Number of loci targeted One Many Sample...identified and the level of on-target enrichment. 2. Determining the spatial and hierarchical organization...Cytogenetics, 11. https://doi.org/10.1186/s13039-018-0368-2  Liu X, Zhang Y, Chen Y, Li M, Zhou F, Li K, Cao H...CAPTURE CAPTURE 2.0 Biotinylation enzyme BirA Endogenous biotin ligases Expression system Stable cell...
  3. CRISPR Plasmids - Empty gRNA Vectors

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    Collection
    ...Cas enzymes? CasPEDIA is an encyclopedia of Class 2 CRISPR systems with wiki entries describing enzyme...BclI-SwaI none S. pyogenes URA3 Wyrick pCRISPomyces-2 61737 Bacteria BbsI yes, cut S. pyogenes Apramycin... S. pyogenes Zhang gRNA Cloning Vector Bbs I ver. 2 85586 Mammalian BbsI None S. pyogenes H Fujii pX601...CRISPR/Cas9 multiplex editing capability with the endogenous tRNA-processing system Plant Utilizes the tRNA... promoters. Bullock pCFD5 Drosophila Utilizes endogenous tRNA processing machinery to excise multiple ...
  4. Viral Vectors 101: The Retroviral Lifecycle

    Type
    Blog Post
    ...that have been developed into retroviral vectors and 2.) a subclass of retroviruses called the lentiviruses...effectively. Retroviral structure   Figure 2: Structure of a retrovirus. Image re-used from Dong...Dong & Kantor, 2021 under CC-BY license. Figure 2 gives a detailed view of the structure of a retroviral...transfer of RT, which would actually occur in step 2 during uncoating. After uncoating, reverse transcription...one of the two strands’ DNA counterparts from step 2 will be integrated by the viral integrase protein ... Air. Environmental Science & Technology Letters, 2(4), 84. https://doi.org/10.1021/ACS.ESTLETT.5B00050...1974). Infectious rous sarcoma virus and reticuloendotheliosis virus DNAs. Journal of Virology, 14(5), ...
  5. 15 Hot Plasmids from 2017

    Type
    Blog Post
    ...NGG)  Editing window ~2 nt  85175  pBK-EE-BE3  SpCas9 (NGG)  Editing window ~2 nt  85176  pBK-YE2-...quantum yield of 0.54) and mScarlet-H with M164H (2-fold improvement in photostability compared to mScarlet...SpCas9 base editors with editing windows as small as 1-2 nucleotides! To reduce off-target effects associated...pBK-YE2-BE3  SpCas9 (NGG)  Editing window ~2 nt  85177  pBK-YEE-BE3  SpCas9 (NGG)  Lower on-target activity...activity than BE3; editing window ~1-2 nt  87438  pET42b-HF-BE3  HF-Cas9 (NGG)  Very low off-target activity...Ladders Are Awesome Tools: They are comprised of 2 plasmids, pPSU1 and pPSU2, that can be amplified affordably...libraries The Gross Lab at UCSF recently deposited 2 Bacillus subtilis libraries with Addgene – the B. ...
  6. Fluorescent CRISPR Reporters: SRIRACCHA and GEmCherry2

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    Blog Post
    ...expressing cells exhibited a 2-4 fold increase in the number of endogenous indel edits when compared to...Denham lab made several other small changes creating 2 other versions but these did not surpass GEmCherry2...fluorescence and in-frame fluorescence.  Figure 2: The GEmCherry reporter. Image from Højland Knudsen...GFP. If there’s GFP expression, presumably the endogenous target site will be cut and repaired by NHEJ ...
  7. Cpf1 Update: Comparison to Cas9 and NgAgo

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    Blog Post
    ..., et al. "Cpf1 is a single RNA-guided endonuclease of a class 2 CRISPR-Cas system." Cell (2015). PubMed... Zhang F. Cpf1 Is a Single RNA-Guided Endonuclease of a Class 2 CRISPR-Cas System. Cell. 2015 Sep 23. ... Find plasmids from this publication at Addgene. 2. Kleinstiver, Benjamin P., et al. "Genome-wide specificities...Genome-wide analysis reveals specificities of Cpf1 endonucleases in human cells. Nat Biotechnol. 2016 Jun 6. ...
  8. Genome-wide Screening Using CRISPR

    Type
    Blog Post
    ...targeting a specific gene within the genome (see Fig. 2). Individual gRNAs are designed in silico using publicly...mouse, human, fly, E. coli, and T. gondii genes.  2) What genetic modification are you trying to make?...CRISPR libraries is a multi-step process (see Fig. 2). In most cases, CRISPR libraries are provided at ... is included on the gRNA-containing plasmid, or a 2-plasmid system in which Cas9 must be delivered separately...uncontrolled cell growth, such as cancer. Figure 2: The CRISPR library must be amplified (A) to be used...consists of two components: the non-specific endonuclease (Cas9) and a single stranded guide RNA (gRNA...
  9. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

    Type
    Blog Post
    ...fluorescent state make them useful for 2-color imaging with green PA-FPs. Table 2: Properties of Selected Reversible... conventional FP imaging. PA-FPs are divided into 2 main categories - those with irreversible and reversible... forms of the chromophore which contribute to the 2 peaks of wtGFP’s excitation spectrum- a major 397 ... / N99K / S148L / I165V / Q167P / L169V / I203R) (2) and PA-mRFP1(S146H / I161V / I197H) (3) were derived...with two distinct wavelengths of light (see Table 2). The best known reversible PA-FP is the naturally... above background. The majority of PA-FPs come in 2 flavours- monomeric and tetrameric. Tetrameric PA-...most PA-FPs, but, in 2015, the Looger Lab designed 2 variants of EosFP that can withstand these conditions...
  10. Hot Plasmids - September 2019 - CRISPR, Auxin Inducible Degradation, MerMAID Channelrhodopsins, and Genome Looping

    Type
    Blog Post
    ...target sites for editing. PAM sequences can be from 2-6 base pairs in length and follow the DNA sequence... Eric Perkins Mammalian genomic DNA is not just a 2-D linear molecule snaking through our cells’ nuclei...-plant cells, which interacts with the cells’ endogenous ubiquitin ligase, the Kanemaki lab was able to...previously developed a CRISPR/Cas9 based method to tag endogenous proteins in HCT116 cells with mAID. Using this...widely used genome editing tool. However, Cas9’s endonuclease activity can be limited by the need for a specific...have designed means of studying the effects of endogenous looping on distal promoters and enhancers, or...
  11. Addgene-Seeding Labs Plasmid Grant: Accelerating Science Globally - 5 Scientists, 4 Countries & 3 Continents!

    Type
    Blog Post
    ... genetically encoded H2O2 probe is pQE-30-HyPer3 (2) which he will co-express together with a plasmid ...Pharmacology 2017 Jun 15;134:1-17. PubMed PMID: 27984002. 2. Bilan, Dmitry S. et al. “HyPer-3: A Genetically Encoded...agricultural plant. Her current research focuses on endophytes, bacteria, and fungi that reside within living...antimicrobial activities (1). She has developed a fast endophyte screening system and plans to employ the light‐inducible...References 1. Martinez-Klimova, Elena et al. “Endophytes as sources of antibiotic” Biochemical Pharmacology...
  12. A Primer on Optogenetics: Introduction and Opsin Delivery

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    Blog Post
    ...commonly used in optogenetics: 1) electrophysiology and 2) behavioral experiments. I’m not an electrophysiologist...choice in the brain region you wish to stimulate 2) Fabrication and implantation of the optical fiber...thoroughly elsewhere (here and here for instance) [2], [3]. Karl Deisseroth of Stanford University , one...reviews for a discussion of the different variants [1, 2, 4]. And, of course, the best way to learn about the...monitor expression at various time points (e.g. every 1-2 weeks over 8 weeks) in order to determine the optimal...(4):251-66. doi: 10.1038/nrn3171. PMID: 22430017. 2. Fenno L, et al. The development and application of...analysis of microbial opsins. Nature methods. 2012;9(2):159-72. doi: 10.1038/nmeth.1808. PMID: 22179551; ...
  13. The Effect of COVID-19 on Liu Lab Plasmid Requests From Addgene Data

    Type
    Blog Post
    ...month, from 1/22/20–2/23/20, where there were zero plasmid requests. Afterwards, from 2/24/20–3/15/20 (the...Each paper has between 1–32 plasmids and a total of 2–2,590 requests. We received plasmid requests from ...observed between Jan. 1 and Mar. 1, 2020. Figure 2: A simple approximation of the effect of COVID-19 ...However, it is evident that if we believe that 1/22/20–2/23/20 are the more accurate dates of lockdown in China...course of the last six months, COVID-19 has had a tremendous impact on our world -- as of June 4, 2020, COVID...
  14. IBEX Knowledge-Base: A Data Resource for Multiplex Tissue Imaging

    Type
    Blog Post
    ...imaging of diverse tissues. Nature Protocols, 17(2), Article 2. https://doi.org/10.1038/s41596-021-00644-9 ...directly from the Zenodo dataset.     Figure 2: Screenshot showing reagent entries with associated...target name, host organism, isotype, clone details, vendor, method, tissue preservation, target tissue, detergent...
  15. CRISPR 101: Targeting RNA with Cas13a (C2c2)

    Type
    Blog Post
    ...question: C2c1, C2c2 and C2c3 (short for Class 2, candidate 1, 2, or 3). C2c1 and C2c3 are related to Cpf1,...however cutting efficiency of Cas13a is reduced when 2 mismatches are present. The protospacer flanking sequence...PMC5127784. Find plasmids from this paper at Addgene. 2. East-Seletsky, Alexandra, et al. "Two distinct RNase... and functional characterization of diverse class 2 CRISPR-Cas systems." Molecular cell 60.3 (2015): 385...new effector (Abudayyeh et al., 2016). In the endogenous CRISPR/Cas9 system, Cas9 uses both a tracrRNA...
  16. Plasmids 101: FLEx Vectors

    Type
    Blog Post
    ...conditional knock-in cassette. As shown in Figure 2, the cassette should contain a reporter DNA sequence...a targeted neuronal population.    Figure 2 (modified from Schnutgen et al. Nat Biotech 2003):...cellular level in the mouse. 2003 PubMed PMID: 12665802. 2. Branda, CS and Dymecki, SM. Talking about a Revolution... SM. 2008. A FLEX switch targets Channelrhodopsin-2 to multiple cell types for imaging and long-range ...mutations and truncations in the absence of the endogenous gene. Spatio-temporal expression of optogenetic...
  17. Rett Syndrome: A History of Research and Therapeutic Outlooks

    Type
    Blog Post
    ...//doi.org/10.1002/1096-8628(200022)97:2<147::aid-ajmg6>3.0.co;2-o Baker SA, Chen L, Wilkins AD, Yu P, ...Caused by a mutation in the methyl-CpG binding protein 2 (MECP2) gene, Rett Syndrome is a rare, progressive...X-linked MECP2, encoding methyl-CpG-binding protein 2. Nat Genet 23:185–188 . https://doi.org/10.1038/13810... (2000) Rett syndrome: Methyl-CpG-binding protein 2 mutations and phenotype-genotype correlations. Am ... this using Cre-Lox mouse models in which the endogenous MECP2 gene was disrupted and silenced by a Lox-Stop...
  18. Technologies Enabled by NanoLuc® Luciferase

    Type
    Blog Post
    ...the system outlined in Schmid-Burgk, J.L., et al (2). In this post, I’ll cover two great applications ...molecularly evolved from mNeptune2 through 33 mutations and 2 deletions. CyOFP1 has a higher quantum yield, brightness...luciferin 24 hours later demonstrated a more than 2-fold brighter signal from Antares as compared to Fluc...PMID: 22894855. PubMed Central PMCID: PMC3501149. 2. Schmid, J.L., et al. (2016) CRISPaint allows modular...reaction. In fact, NLuc is bright enough to detect endogenous tagged genes generated through CRISPR/Cas9 knock-in...knock-in. Finally, NLuc is very inviting for endogenous protein tagging as it is only 19 kDa. An example...
  19. Tips for Getting a Faculty Position

    Type
    Blog Post
    ... this problem? (2-3 sentences) What will be the focus of your first grant? (1-2 sentences) ...of scientific success is publications and grants. 2. Write succinct and easy to understand documents A...consideration. 3. Present an easy to follow seminar See item 2. Attendees will include grad students (that are solicited...people would agree is important to understand. (1-2 sentences). For example: Distinguishing correctly ...quality control of secretory proteins in the Endoplasmic Reticulum, optimization of fluorescent proteins...
  20. Tetracycline Inducible Expression

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    Collection
    ...expression tTA Off Verma 26803 pEnt L1L3 EF1a-tTA-2 Contains Gateway L1L3 sites and EF1α promoter driving...controlling eukaryotic gene expression. Several endogenous promoters had been identified that responded ...secondary effects. Scientists began to pursue a non-endogenous system for eukaryotes. At the time, bacterial... by the tetracycline repressor (tetR). In the endogenous bacterial system, if tetracycline, or one of ...
Showing: 61 - 80 of 221 results