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Showing: 41 - 60 of 462 results
  1. High Complexity Golden Gate Assembly with NEB’s DAD

    Type
    Blog Post
    ...possible to select for correctly assembled phage genomes, it required a very stringent selection process ...12 fragments (Pryor et al., 2020), and randomly selected non-palindromic pairs allows for high-fidelity...developed, outlined below, allow for researchers to select large sets (with overhangs that violate some of...assembly, which used only antibiotic screening for selection, failed under normal cycling protocols, and required...
  2. A New Generation of Adenine Base Editors Improves Editing in Primary Human Cells

    Type
    Blog Post
    ...Therapeutics, used a previously developed bacterial selection strategy (Gaudelli et al., 2017) in combination...concurrent base edits to withstand antibiotic selection. As a result, 8 mutations in TadA could create...for positions A3-A4 and A8-A10. The researchers selected 8 of the tested ABE8 constructs (ABE8.8-m/d, ABE8.13...targeted 6 genes in primary human T cells using 8 selected ABE8s and ABE7.10. They quantified genomic editing..., the V106W version of ABE8, and a thoughtful selection of guideRNAs. Of particular note, ABE8s reported...
  3. Fluorescent Proteins 101: Visualizing Subcellular Structures & Organelles

    Type
    Blog Post
    ...close?” After tagging your protein of interest and selected subcellular marker proteins, it’s possible to ...overlap, it is essential to make sure that the selected FPs do not influence each other and thus potentially...As a baseline rule, the emission spectra of the selected FPs need to be sufficiently separated, most commonly...with red and green wavelengths, respectively, are selected (6). These previous blog posts help with the decision... decision of which FP you should use and how to select FPs for muli-color imaging. Furthermore, one must...
  4. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    ...endogenous genes and simultaneously introduce a selection marker for screening modified strains. With SapTrap...mCherry) and nonfluorescent (Halo, SNAP) tags, a selectable marker (floxed Cbr-unc-119) for easy screening... the donor plasmids with SapI allows the tag, selectable marker, and connector to be released (Fig. 1,...and marker sequence into the targeted loci. The selectable marker can be removed by Cre-mediated excision... TEV-V5) with either blasticidin or puromycin selection. Researchers at the Allen Institute for Cell Science...
  5. Cloning Mammalian Cells with the Agarose Method

    Type
    Blog Post
    ...cells into 3 plates at different densities for selection). A 2% agarose solution is then melted (and thereby...day after transfection into plates containing selection agent at different densities, then dispose of ... blots, dot blots, ELISAs, and enzyme assays to select both over- and under-expressing clones. If GFP-...fluorescence microscopy can theoretically be used to select specific wells from the 48-well plate for further...potentially be picked following colony formation in selective medium containing a low percentage of agarose,...
  6. Golden Gate Assembly Upgrades: More Fragments, Faster Assembly, and Higher Fidelity

    Type
    Blog Post
    ...acquisition of antibiotic selectable markers by the destination plasmid. Antibiotic selection allowed for high ...for any suppression of background by antibiotic selection. Screening of transformants by colony PCR confirmed...at the same high frequencies as the antibiotic selection markers. The 5-, 12- and 24-assembly systems were...outgrowth containing the transformants onto the selection plate. Figure 2 shows representative transformation...
  7. Genome-wide Screening Using CRISPR

    Type
    Blog Post
    ...system are absolutely necessary to ensure that you select the correct CRISPR library. Choosing the CRISPR...you There are several factors to consider when selecting a CRISPR library for your experiments. 1.  What...carries several genome-wide CRISPR libraries and a selection of sub-libraries targeting specific classes of...  Mutant cells are enriched using either drug selection or fluorescence-based cell sorting and screened...of specific gRNAs can lead to skewed results. Selecting a cell type - Theoretically, any cell type can...
  8. Plasmids 101: Gateway Cloning

    Type
    Blog Post
    ...step is to transform competent E. coli cells and select the positive clones. The entry clone and destination... here by plasmid color), allowing you to easily select for the expression clone. You will also need to...The positive (antibiotic) and negative (CcdB) selection markers used for Gateway Cloning can increase ...sites for recombination; ccdB gene for negative selection Used to clone attB-flanked genes of interest to...sites for recombination; ccdB gene for negative selection; elements to express the gene of interest in the...
  9. Tips for CRISPR Gene Editing in Mice

    Type
    Blog Post
    ...this post, we will outline a simple method for selecting the guide RNA, validating its efficacy in vitro... research up and running as soon as possible! Selecting your target CRISPR/Cas9 is often used to study...target region (approximately 500bp is best) and select the organism. It will then tell you the available...design software. When you are happy with your selection, ordering the sgRNA is simple and easy. Several...is a simple and fast method for validating your selected gRNA’s, and has the bonus benefit of supplying...
  10. Deep Mutational Scanning with One Pot Saturation Mutagenesis

    Type
    Blog Post
    ...library frequency before selection compared to its library frequency after selection. Key to this process ...all desired variants of a protein. Applying a selective pressure winnows the pool down to plasmids expressing...measure the frequency of each variant during the selection process. Each variant is assigned a functional...et al for advice on choosing and validating a selection system. You can test the effect of multiple mutations...
  11. Adeno-associated Viruses (AAVs) for Genome Editing

    Type
    Blog Post
    ...improved on this finding with the addition of selectable markers that are only expressed when the targeting...to cells with efficiencies of 1-40% after G418 selection (Kohli et al 2004, Kim et al 2008). While the ...and used to infect recipient cells. After G418 selection, individual gene edited clones are identified ...generates knockin efficiencies of 1-40% with G418-selected clones. However, there are important disadvantages... reason, the AAV-based approach requires G418 selection of infected clones, making it unsuitable for most...
  12. Antibodies 101: Single Chain Fragment Variables (scFvs)

    Type
    Blog Post
    ...assays to select for strong binders. Then the sequences for the variable domains of the selected scFvs are...phage display (Bradbury et al., 2011). In vitro selection avoids animal immunization and also allows for... display library with plate-bound antigen helps select for high affinity scFvs. Bound phage are then proliferated...library is incubating with plate-bound antigen to select for scFvs with high affinity binding. Bound phage...
  13. Viral Vectors 101: AAV Serotypes and Tissue Tropism

    Type
    Blog Post
    ...capsids are available in the repository and can be selected as a serotype for Addgene’s Packaged on Request...available as plasmids in the repository and can be selected as a serotype for Addgene’s Packaged on Request... of our in-stock viral prep service and can be selected as a serotype for Addgene’s Packaged on Request...
  14. Easi-CRISPR: Generating Knock-In and Conditional Mouse Models

    Type
    Blog Post
    ... and a selection marker, then electroporate it into mouse embryonic stem cells. After selecting for clones...the desired edit. You’d also need to remove the selection marker, likely by breeding to a mouse line with...generate your desired mutation in mouse ES cells, select for the mutation and inject the ES cells into a... shown. In this case, the green guide would be selected, since it cleaves at the stop codon TAG. Design...
  15. Searchable and Sortable gRNAs for Your Next CRISPR Experiment

    Type
    Blog Post
    ...Proper target selection and gRNA design are essential for a CRISPR experiment.  The selection process is ...guarantee that the selected sequence will yield a useful gRNA.  Alternatively, you can select a target sequence...
  16. New Norepinephrine Indicators: nLightG and nLightR

    Type
    Blog Post
    .... nLight indicators are more sensitive to and selective for norepinephrine and faster to respond than ...experiments, including ones that study alpha2-AR. Selectivity Norepinephrine and dopamine are similar molecules...studying norepinephrine. nLight is 28-fold more selective than GRABNE, with both nLightG and nLightR showing...showing significantly increased selectivity for norepinephrine over dopamine. All three sensors, however...
  17. Hot Plasmids - October 2022

    Type
    Blog Post
    ...authors show that HcKCR1 and HcKCR2 have high selectivity for K+ over Na+ and rapid photocurrent kinetics...out-performing previous attempts to engineer potassium-selective channelrhodopsins. HcKCR1 has a maximum absorption...1,040 nm, has larger photocurrents, and is more selective for K+ than HcKCR2, making it more suitable for...optogenetic use.   Fig. 2: A) HcKCR1 is highly selective for K+ over other Na+ and other cations. B) Cortical...
  18. 27 Hot Plasmids from 2016

    Type
    Blog Post
    ...Unfortunately, these inhibitors are often non-selective, affecting the entire genome and not specific ...BioID2, is significantly smaller, allows for more selective targeting of fusion proteins, requires less biotin...homology arms and both auxotrophic and dominant selection markers, allowing for use with both laboratory...including fluorescent tags, a floxed Cbr-unc-119 selectable marker, and “connectors” that link tags to the...lines with the appropriate fusions could then be selected for using the indicated antibiotics. In addition...Though auxotrophic markers are used frequently for selection in yeast, Addgene's own Plasmids 101: Yeast Vectors...biology and drug discovery is focused on developing selective kinase inhibitors to probe these signaling pathways...
  19. The CRISPR Software Matchmaker: A New Tool for Choosing the Best CRISPR Software for Your Needs

    Type
    Blog Post
    ...no one-size-fits-all approach. You will have to select a tool based on your project and not general opinion...is composed of these features and enables you to select the tool(s) based on your project needs. There ...This category is important for users wishing to select tools based on their comfort level with operating... for one. Use the CRISPR Software Matchmaker to select the best tool based on your needs. Refine your ...into their individual offerings and allow you to select them based on your needs. We will likely begin ...
  20. Finding and Joining Your Dream Lab

    Type
    Blog Post
    ...day? We asked three lab heads how they go about selecting new hires. This is followed by some perhaps surprising...they hire scientists for their labs. Tom Ellis selects new hires from a pool of CVs collected from throughout... must fit with their interests.” George Church selects new hires initially based on those who notice and...opportunities, not salary and benefits. Therefore, lab selection should focus on identifying a lab that fits both...
Showing: 41 - 60 of 462 results