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  1. Resolute Plasmid Collection

    Type
    Collection
    ...proteomic interactions represent the framework that provides biological context. Assays monitoring impedance...sub-cloning into a wide range of Gateway-compatible pDEST vectors. ID Plasmid Gene/Insert Industry PI Pooled...solute carrier family of proteins. Library ID PI Description Human SLC Activation Library 132561 Superti-Furga...
  2. SARS-CoV-2 Pseudotyped Virus

    Type
    Collection
    ...CoV-2), modification, or variant. ID Plasmid Description Mutations Industry PI Due to export control regulations...expressing mCherry and firefly luciferase. pLentiEGFPdestablized - EFS-EGFPd2PEST-2A-MCS-Hygro - Lentiviral...Lentiviral vector expressing destabilized EGFP. Lenti-luciferase-P2A-Neo - Lentiviral reporter vector expressing...
  3. CRISPR Plasmids - Base Edit

    Type
    Collection
    ...Resources CRISPR Guide Viral Preps Protocols gRNA Design Tools CRISPR Blog Posts Two classes of base editors...protein (Mu- GAM). While many base editors are designed to work in a very narrow window proximal to the...encyclopedia of Class 2 CRISPR systems with wiki entries describing enzyme activity, experimental considerations,...
  4. Malate Dehydrogenase CUREs Community Collection

    Type
    Collection
    ...protein with many available isoforms and mutants provides a shared experience for the research community...site loop", or "subunit interface") ID Plasmid Description Gene/Insert Mutations Additional Resources MDH...Results in Student Learning Gains and Positive STEM Attitudes in CUREs. Callahan KP et al. CBE Life Sci Educ...
  5. Adenovirus Plasmids

    Type
    Collection
    ...strains for generating adenovirus. ID Strain Description PI 16398 BJ5183 Strain for recombination between... plasmids that have inserts. ID Plasmid Type Description PI 16400 pAdEasy-1 Adenoviral For recombining... be assembled in a one-tube reaction. ID Kit Description PI 1000000176 AdenoBuilder toolkit Plasmids contain...
  6. Adeno-associated virus (AAV) Plasmids

    Type
    Collection
    ... are used in conjunction with the plasmid that encodes the viral genome (typically called cis -plasmid...plasmid). Helper Plasmid ID Plasmid Serotype Description PI 112867 pAdDeltaF6 All Helper plasmid for AAV...Packaging Service at Addgene ID Plasmid Capsid Description PI 112862 pAAV2/1 AAV1 AAV packaging plasmid,...
  7. Allen Institute for Cell Science Plasmid Collection

    Type
    Collection
    ...Mitochondria 87424 DSP-mEGFP AICSDP-9 mEGFP Desmoplakin Desmosomes 87425 ACTB-mEGFP AICSDP-15 mEGFP Beta-actin...human cell lines of their choice. For a full description of how to use these plasmids, check out Plasmids...
  8. Genetic Code Expansion

    Type
    Collection
    ...based upon four nucleotides, 64 codons, and 20 amino acids. Yet in the past two decades, biologists have...included. For any and all questions you have while designing, implementing, or troubleshooting GCE experiments...non-standard amino acid incorporation. ID Strain Description PI 48998 C321.ΔA all TAG sites changes to UAG...
  9. Tetracycline Inducible Expression

    Type
    Collection
    ...tetracycline, tetracycline binds to tetR. This precludes tTA binding to the tetO sequences and subsequent...and induce your gene of interest. ID Plasmid Description Co-expressed tTA, rtTA, or TetR On or Off PI ...transactivator for your tetraycline system. ID Plasmid Description Element On or off PI 26429 pLenti CMV rtTA3 Blast...
  10. Easi-CRISPR: Generating Knock-In and Conditional Mouse Models

    Type
    Blog Post
    ...using in mouse transgenics. Designing an Easi-CRISPR knock-in allele To design a knock-in allele at a given... PAM or guide mutation. Designing an Easi-CRISPR conditional allele The design for a floxed conditional...successfully used guides targeting the same or complementary strands, as well as guides facing towards or...How to design a conditional allele with Easi-CRISPR. As in the knock-in example, you’ll design your ...with your desired insertion feature (e.g., a fluorescent protein), you can amplify the desired region using... Figure 5: How to design Easi-CRISPR repair templates using Addgene plasmids. Design PCR primers to add...arduous. First, you’d construct a plasmid with your desired changes, long homology arms and a selection marker...
  11. Optogenetics AAV Preps

    Type
    Collection
    ...ChrimsonR (soma-targeted) mRuby2 Cre dependent 9 Adesnik 124603 pAAV-EF1a-DIO-ChrimsonR-mRuby2-KV2.1-WPRE-SV40... ChroME (soma-targeted) mRuby3 Cre dependent 9 Adesnik 124651 pAAV-CamKIIa-ChrimsonR-mScarlet-KV2.1 CaMKII...eGtACR1 (soma-targeted) mRuby3 Cre dependent 9 Adesnik 137155 pAAV-nEF-Con/Fon-iC++-EYFP nEF iC++ EYFP...
  12. 27 Hot Plasmids from 2016

    Type
    Blog Post
    ...relaxed gRNA design parameters. To demonstrate the effectiveness of their library design, Moffat laboratory...-strand DNA (ssDNA) oligonucleotides (oligos), and thereby rapidly create desired allele combinations ... pCAG-T7-TALEN(Sangamo)-Destination series, pCAG-Golden-Gate-Esp3I-Destination Takashi Yamamoto pcDNA-TAL-NC2...vector, and besides being used for restoring strain prototrophy, can also aid in designing self-establishing...assay. In their recent publication, Kroeze et al. describe their enhanced TANGO arrestin recruitment assay...optimized, expression validated GPCR sequences to any desired backbone.  Kroeze, et al. Nat Struct Mol Biol....plasmids with the Cross-disciplinary Integration of Design Automation Research lab Moduclar Cloning (CIDAR...
  13. Plasmids 101: Gateway Cloning

    Type
    Blog Post
    ...clone in their desired DNA sequences. Gateway technology relies on the two reactions described below: The ...pLenti CMV Puro DEST (w118-1) or the doxycycline-inducible pLIX_403. The chosen attR destination vector will...between the entry clone and destination vector creates two products: the desires expression clone and a byproduct...produce the desired expression clone. This is possible thanks to the Gateway vectors’ design. They have...vector systems. With the appropriate entry and destination vectors, one can use Gateway to clone a gene ...generated entry clone and the attR sites of the destination vector. This reaction is catalyzed by the LR ...containing the ccdB gene is excised from the destination vector.  Once the BP and/or LR reactions are ...
  14. Lambda Red: A Homologous Recombination-based Technique for Genetic Engineering

    Type
    Blog Post
    ....  These primers are typically ~70 nucleotides long (20 nucleotides that anneal to the DNA sequence of..., the substrate should be ~70-100 nucleotides long with the desired alteration(s) located in the center...genomes. 2) Designing ssDNA oligos that avoid MMR activation:  There are two ways to design oligos that...tube. The donor DNA substrate only requires ~50 nucleotides of homology to the target site for recombination... be explained in greater detail. Substrate DNA design and generation Expression of lambda red recombination...antibiotic resistance cassette.   Substrate DNA Design and Generation Whether you use a linear dsDNA or...insertions or deletions greater than approximately 20 nucleotides, while ssDNA substrate is best for point mutations...
  15. Making CRISPR Plasmids Using Fragmid

    Type
    Blog Post
    ...list of Fragmid destination vectors currently available. Table 1: Fragmid destination vectors Organism...website, which breaks the design process down into four easy steps, provides the real value for the user...potential of them not working, or spend a few weeks designing and cloning the vectors you actually want. But... Fragmid is a modular vector assembly process designed for a quick, plug-and-play approach to cloning...et al., 2024). It reduces the amount of time to design and create a new vector to four days for an experienced...high school interns, were able to use Fragmid to design and clone their vectors in five days. Did you say...s modular assembly structure takes a lot of the design work out of the plasmid creation process. Each ...
  16. How to Deposit Your Plasmids with Addgene

    Type
    Blog Post
    ...preprint title or a general description of the deposit. Select your desired distribution status: Hold...choose from one of the following descriptions for your plasmid: Encodes insert(s) A plasmid with one or...should describe how your plasmid is intended to be used. For instance, if your plasmid is designed to allow...Unpublished or pre-publication plasmids" and set a desired distribution status. You can submit "Published ...plasmids with the original publication where you described them. Search for your article as you would search...selected your publication or entered your deposit description, the next page will allow you to add plasmids... article. Note that if you entered a deposit description, this will become your article title.   ...
  17. CRISPR 101: Multiplex Expression of gRNAs

    Type
    Blog Post
    ...ligated into Cas9 or dCas9-containing destination vectors. Destination vector options include humanized wt...cell that gets the plasmid contains all of the desired gRNAs. This increases the chance that all the edits...promoters. To use this plasmid, you simply order oligonucleotides for your chosen gRNA target sequences and ...ordered assembly of multiple components into a destination vector. The first step in CRISPR/Cas9 Golden ...Golden Gate multiplexing is to clone the oligonucleotides specifying each gRNA target sequence into distinct...together to allow for ordered assembly into a destination vector that expresses Cas9. This is illustrated...rectangles) are cloned into various plasmids using oligonucleotides. These plasmids contain Type IIS restriction...
  18. Early Career Researcher Toolbox: Free Online Molecular Biology Tools

    Type
    Blog Post
    ...primer design Design primers for Goldengate cloning   Design primers for In-Fusion Cloning Design primers...traces, while the paid version provides more tools for plasmid mapping and design (Figure 1). Benchling: While...academic users. Serial Cloner: Free desktop-based software for plasmid design and mapping. ApE (A plasmid Editor...Primer design tools Many of the above-listed plasmid mapping tools have built-in primer design tools, ...stand-alone sites for general primer design, as well as primer design for different cloning applications...characteristics. NEB Data-optimized Assembly Design (DAD): This tool designs overhang sets for high complexity Golden...Primer design. Plasmid mapping. DNA sequence analysis. We all have our favorite tools for tackling these...
  19. 28 Hot Plasmid Technologies from 2015

    Type
    Blog Post
    ...vectors in a Multisite Gateway reaction with a desired destination vector expressing a separate reporter gene... can't give all of them attention they righlty deserve, but, in this post, we'll provide a small sampling...-2xNLS-VP64 and dCas9(N)-FRB-NES). This system provides users greater temporal control over CRISPR/Cas9...cell events Three years ago, Brian Kuhlman’s lab designed photoswitchable dimers by fusing the SsrA peptide...the authors recently used computational protein design, phage display and high throughput binding assays...transcription of downstream genes. Nihongaki et al describe the targeted activation of endogenous genes and... a gene-specific forward primer containing the desired restriction site (the MCS has several options) ...
  20. Plasmids 101: Golden Gate Cloning

    Type
    Blog Post
    ...customized to direct assembly of DNA fragments. When designed correctly, the recognition sites do not appear... scheme is as follows: the gene of interest is designed with Type IIS sites (such as BsaI or BbsI), that...and do not appear in the final construct. The destination vector contains sites with complementary overhangs...ligation can be done in one 30-minute reaction. The destination vector and entry vector(s) are placed in a single...IIS enzyme and ligase. Although the original destination vector + insert may spontaneously religate, this... be re-digested. In contrast, formation of the desired ligation product is irreversible because this construct...a single reaction! These overhangs specify the desired order of fragments, and the loss of enzyme recognition...
  21. Uncovering Ancestral Bias in CRISPR Research

    Type
    Blog Post
    ... reference?  The CRISPR guides used in the screens they analyzed were designed to have a perfect match...African descent have approximately 20% more single nucleotide polymorphisms (SNPs) that map to guides in the...accounted for in the CRISPR guides they used, leading to mismatches between the guides and the lines’ genomes...modify the CRISpick algorithm to prevent guides from being designed that target regions with high genomic...coming through an unexpected source: the CRISPR guides, short pieces of RNA that bind to a cell’s DNA,...x-axis) which SNPs map to thetargeting sequences of guides across 8 CRISPR libraries. Samples are divided ...are more common in individuals of African descent.Correcting the bias  While their thorough analysis uncovered...
  22. 10 Steps to a Perfect Science Talk

    Type
    Blog Post
    ...suspense. Notice the simplicity of their slides and how the slides complement the spoken message. Learn from...speak to start creating slides or thinking about content. Create a Google.slides or Powerpoint file right...how these speakers talk without looking at their slides or notes. Listen to their stories and narratives...listeners to be thinking “What happens next?”  Describe how you pushed to a solution or overcame obstacles...term, but are worried that this might sound condescending, consider explaining the term on a slide but...talk will really take and to adjust content and slides to better suit the target time frame.   I suggest...peers than a less supportive audience? 7. Hone Your slides Use big images that are easy to see (and for heavens...
  23. Plasmids 101: Walkthrough of Addgene’s Snapgene-Powered Quality Control Process

    Type
    Blog Post
    ...experiments that can be partially designed using the Snapgene desktop software. If a plasmid contains a...sequencing results with reference sequences To design experiments for further plasmid verification Identifying... contents of the resulting FASTA file into the desktop version of Snapgene to visualize the sequence and...in Snapgene’s extensive database. Snapgene also provides easy visualization of open reading frames, which...any known sequences for the insert. The Snapgene desktop software allows us to quickly align multiple sequences...verification experiments: Primer and restriction digest design Some regions of plasmids are difficult to sequence...region with a high amount of guanine and cytosine nucleotides, we might need to send it for Sanger sequencing...
  24. Scientific Reproducibility - Focusing on Solutions at the Minisymposium on Reproducibility

    Type
    Blog Post
    ...experimental designs and we need to be transparent about the reasons we alter these designs if we do so...experimental design to a journal prior to performing the experiment (or set of experiments), the design would...from the event can be found below along with a description of the program beneath it. You can jump to the...the different time stamps in the description to watch any sections you’re particularly interested in, ...JoVe, and Bio-protocol all work to provide more descriptive and interactive protocols that make it much easier...and not just impact. Cause #3: Poor experimental design It’s easy to get excited about positive results...experiments to work, but part of good experimental design is recognizing that we’re biased and taking steps...
  25. Custom CRISPR Screens & the Green Listed Software

    Type
    Blog Post
    ... massive amount of descriptive transcriptomics data. Custom CRISPR screens designed to target differentially...Institutet, in Sweden. It can be very time consuming to design 5 guide RNAs (gRNAs) targeting each of the 1000...). Green Listed is a new software tool used to design gRNAs for custom CRISPR screens targeting a (long...moment, 13 full genome SpCas9 knockout libraries designed by different academic labs, targeting mouse, human...drug targets  Another interesting approach is to design screens against known druggable targets, preferentially...library from Addgene, and then use Green Listed to design a smaller validation screen using selected gRNAs... could also be combined. For example, you could design a screen targeting all differentially expressed...
  26. Plasmids 101: Knockout/Knock-In Plasmids

    Type
    Blog Post
    ...often use the Cre/Lox system described earlier. In this case, you design your targeting vector such that...replacing it or disrupting it with an piece of DNA designed in the lab. Specially constructed plasmids can...template with the endogenous gene. Here, we'll describe the techniques and the plasmids used to inactivate...inactivate specific genes in mammalian cells. Despite the popularity of CRISPR-based knockout/knock-in systems...locus with homologous sequence using a specially designed vector that contains sequence homology to the ... the process, we’ll walk through an experiment designed to knock out exon 2 of a given gene.   ... Figure 1: A knockout targeting vector designed to insert a resistance gene. The vector contains a neomycin...
  27. Plasmids 101: Multicistronic Vectors

    Type
    Blog Post
    ...adapted "self-cleaving" 2A peptides into their muliticistronic vectors. These peptides, first discovered in ...plasmids) are designed to have one or more of the genes replaced.  Additionally, 2A peptides could be PCR-cloned...PDF that you can save on your desktop. The Plasmids 101 eBook is designed to educate all levels of scientists...incorporated into plasmids for research purposes are described below. IRES Elements Translation in eukaryotes...the specific genes cloned into the vector.3  2A Peptides To overcome some of the disadvantages of the IRES...self-cleaving" is not entirely accurate, as these peptides are thought to function by making the ribosome...Proline.  The table below lists the four common 2A peptides employed by scientists. 2A cleavage is universal...
  28. Plasmids 101: Gibson Assembly and Other Long-Homology Based Cloning Methods

    Type
    Blog Post
    ... friends on the Cambridge 2010 iGEM team that describes the basics of Gibson assembly as a parody of “...assembly The Gibson assembly technique was first described by Dr. Daniel Gibson and colleagues at the J. ... Both Snapgene and NEB have tools that help you design primers for PCR amplification of fragments to incorporate...demonstration of how to use Snapgene’s program to design primers for Gibson Assembly. For a simple example...without scars as depicted below. First, you need to design primers to amplify the two fragments while also...the process works best with fragments over 200 nucleotides. This may be because the exonuclease could chew... through an entire fragment shorter than 200 nucleotides before the annealing and polymerization steps...
  29. Hassle-free 96-well Format Epitope Tagging Using Cas9 Ribonucleoprotein

    Type
    Blog Post
    ...knock-in. Another good design tool can be found at Desktop Genetics .For ssODN design, remember to incorporate... systems, you will have to design your crRNAs using other web-based design tools (for C-terminus tagging... not work in pull-down assays: Epitope tagging provides a solution Proteins - the workhorses of the cell...to mention frustrating. One elegant solution to sidestep the antibody problem is to tag the protein of ...sequences at the intended target site. With the widespread adoption of CRISPR/Cas9 technology and rapid ...bioinformatics tool for guide RNA and donor DNA design, and implemented our optimised protocols into a...genome browser: https://www.ensembl.org/index.html Design crRNA/ssODN: Using Ensembl Transcript ID(s) as ...
  30. High Complexity Golden Gate Assembly with NEB’s DAD

    Type
    Blog Post
    ...rules of thumb for designing your overhang sets. But are those rules the best way to design GGA overhang sets...overhangs with the same three nucleotides in a row; (4) no more than two nucleotides in the same position; (...data-optimized assembly design (DAD) to build out three tools to help researchers design high-fidelity Golden...the traditional rules of thumb for overhang set design allowed for high-fidelity assembly for sets of ... overhangs that violate some of the traditional design rules) for successful high-complexity Golden Gate...with a high potential for mismatches, so you can redesign individual pieces as needed to improve fidelity... a stochastic search algorithm rather than pre-designed sets, so identical searches can return multiple...
  31. Simplify Cloning with in vivo Assembly

    Type
    Blog Post
    ...ultracompetent (109 CFU/μg) cells. Primer design Using specific primer design (Figure 2), IVA cloning can be used...primers that bind at either side of the undesired portion, designed to amplify the rest of the vector sequence...primary method to produce the linear fragments, as desired modifications and homologous regions can be encoded...specifically cuts methylated DNA, so it will selectively destroy the template, but not newly synthesized sequences...mutagenesis to complex assembly of multiple genes. Primer design for each type of modification is shown in Figure... main requirement for IVA cloning is carefully designed primers. The majority of mistakes are due to incorrect...homologous sequences are encoded at the 5’ end. First design the template binding region, with a melting temperature...
  32. Plasmids 101: Colony PCR

    Type
    Blog Post
    ...step to colony PCR is designing primers. There are 3 strategies for primer design: 1) insert-specific primers... second option is to design backbone-specific primers. These primers are designed to anneal to sites that...less money. The key steps to colony PCR are: 1) design primers to detect the presence of your insert; ...things to consider when performing colony PCR.   Designing colony PCR primers The first and perhaps most ...-specific primers: Insert-specific primers are designed to anneal to an insert-specific sequence. This...backbone but that contain different inserts. When you design primers to anneal outside the cloning site, it ...about insert orientation, then you might consider designing orientation-specific primers. Blunt end cloning...
  33. CRISPR Challenges: Standardization and Homology Directed Repair

    Type
    Blog Post
    ...working with CRISPR than just designing a repair template that contains your desired edit, and I want to make...say about CRISPOR, a tool to help you design, pick, and close guides for Cas9 and Cpf1. This tool supports...The blog post I mentioned, John Doench’s How to Design your gRNA for CRISPR Genome Editing, gets over ...these numbers show that this basic concept of gRNA design is still challenging for researchers using CRISPR..., and that standardizing and improving the gRNA design process and rules for various applications is necessary...tackle the challenges of DNA repair (with bonus gRNA design resources.) Subscribe to CRISPR updates on our ...in Human Cells Hands-on tips for repair template design from guest bloggers Dominik Paquet and Dylan Kwart...
  34. Comparing Cas9 to NgAgo: Can the Argonautes Best CRISPR?

    Type
    Blog Post
    ...DNA guides NgAgo uses 5’ phosphorylated DNA guides (so called “gDNAs”) rather than the RNA guides employed...24 base DNA guides may be more user-friendly, since they can be ordered as oligonucleotides and should ...gDNA guides will also need to be transfected into the cells of interest. In contrast, RNA guides must ...important role in RNA interference, binding RNA guides to cleave foreign RNA. Argonaute proteins are also...cleave DNA in vitro, directed by phosphorylated DNA guides. Unfortunately, Swarts et al. were unable to show...NgAgo preferred certain guide sequences - using 5 guides/gene for 10 genes, they did not observe differences...a different approach, randomly removing 1-20 nucleotides from the cleavage site specified by the gDNA....
  35. Rewiring Metabolic Circuitry with CRISPR RNA Scaffolds [Video]

    Type
    Blog Post
    ...for CRISPRi are described here: http://www.addgene.org/crispr/qi/ Plasmids described in  Zalatan et ...stepwise protocol on designing and using RNA scaffolds: Delebecque, C. J. et al. Designing and using RNA scaffolds...regulators allows a greater degree of control of desired expression levels dependent upon the type of transcriptional...transcriptional regulator or the number of designed scaffold binding sites. With hundreds of characterized...tunability of transcription is possible. From a design perspective, this is appealing since the RNA scaffold...pairing, allowing for rational, straightforward design. Since the technique relies on base pairing, it...and multidirectional multiplex control via scRNA design is readily apparent in metabolic engineering. The...
  36. Twenty Years of Sharing: Expanding Accessibility

    Type
    Blog Post
    ...shipping. However, there were issues that persisted despite our best efforts. With a little over half of our...packages navigated customs and arrived at their destination in a timely manner and at the correct temperature...for their experiment.     Table 1: Most popular guides, protocols, and collections of 2023. Educational...Educational Resource Top Five by Views Guides CRISPR Guide Lentiviral Guide AAV Guide Optogenetics...Electrophoresis Bacterial Transformation How to Design a Primer Creating Bacterial Glycerol Stocks Inoculating...Origin of Replication What is a Plasmid? How to Design Your gRNA for CRISPR Editing The Promoter Region...Analysis Videos What is a Plasmid? How to Design Primers for PCR Agarose Gel Electrophoresis Inoculating...
  37. Screening for Successful Genome Editing with Digital PCR

    Type
    Blog Post
    ...your genome edits, this paper provides detailed instructions on how to design such assays, in addition to...great deal of precision. This means digital PCR provides an absolute measure of target abundance, does ...what kind of assays can be used to sniff out your desired mutations. The assays you will use aren’t that ...often used in real time PCR. These assays can be designed to detect either a donor sequence integrated through...non-homologous end joining (NHEJ) (2-5), depending on your desired genome edit. Since exploitation of NHEJ to generate...the target locus, as well as a reference probe designed to bind at an unedited site distal tothe predicted...double strand break, and a NHEJ/ “drop-off” probe designed to bind directly at the predicted double strand...
  38. Kiran Musunuru on the Newest TALEN Genome-Editing System

    Type
    Blog Post
    ...essentially any DNA sequence desired. This technology allows you to create a pair of designer proteins that will...nucleases that will bind desired sequences. TALENs are much more reliable. If you design them for a particular... simple to design TALENs. It only takes two to three days from the moment you are designing a TALEN on...Cell, Musunuru, Chad Cowan and their colleagues describe a much more efficient tool for doing that disease...people unfamiliar with this new TALEN kit, can you describe it for us? Musunuru: TALENs are a type of genome...target a particular DNA sequence? Musunuru: The kit includes 832 plasmids containing prefabricated pieces that...to build a DNA-binding domain to recognize any desired 15 base pair sequence in the genome in rapid fashion...
  39. CRISPR 101: Validating Your Genome Edit

    Type
    Blog Post
    ...screening by PCR may be the way to go. Design a PCR to flank your desired edit site and run the PCR product...nucleotide along with your desired edit. This silent mutation should be designed solely for restriction enzyme... updated Nov 3, 2022 by Susanna Stroik. You’ve designed your gRNA and introduced it into your target cells... your cells were appropriately edited for your desired mutation - insertion, deletion, or site-directed...know a few things about your target cells and the desired edits. First, you will need to know what the ploidy...knockout mutations When a knockout cell line is desired, any mutation that introduces a frameshift in the...frequency of your sgRNA-Cas9 combo. Pro tip: When designing your PCR, ensure there is at least ~200 base pairs...
  40. Plasmids for Endogenous Gene Tagging in Human Cells

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    Blog Post
    ... later this year. Designing the donor plasmid Figure 2: Donor plasmid design strategy. A donor ...with each cell line. The editing strategy and design described above can be used to create similar donor ...GFP tag and 1kb of homologous DNA flanking both sides (about 2.7kb total)—is inserted into a plasmid backbone...plasmid to prevent the plasmid from being cut and destroyed by CRISPR/Cas9 during transfection. Making the...use electroporation, a technique that briefly destabilizes the cell’s outer membrane and allows the components...Addgene’s CRISPR-based Protein Tagging collection includes systems for tagging mammalian cell lines, Drosophila...
  41. Plasmids 101: Control Plasmids

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    Blog Post
    ...and should be designed accordingly. If you are trying activate a gene, you should design a control that...carried out by scientists every day. Although the designs and outcomes may vary, one thing should be present...these control plasmids are critical for the correct design of the experiment.  The Experiment: Knockdown the...control plasmids Part of planning your experiment includes determining what factors need to be controlled...microscopy images resulting from our experiment that includes the aforementioned internal control and is consistent...correct interpretation of the results because it provides an important reference point when analyzing the...positive control, the internal control vector, was described earlier. Once you are sure your conditions are...
  42. 3 Tips to Improve HDR Efficiency for CRISPR Editing in Human Cells

    Type
    Blog Post
    ...overall HDR rates, we have shown recently that desired genome-editing events by HDR can be generated more...genome editing with CRISPR/Cas9 in human cells was described in 2013 (Cong et al, Mai et al) we were very excited...introduced. Although we were able to introduce the desired mutations in genes associated with dementia, such...CRISPR from re-cutting the target sequence once the desired edit has been introduced. We found that blocking...only saw incorporation of the blocking mutation. Despite the fact that both the blocking mutation and our...thinking further about the distance relationship described above, we realized that, in addition to increasing...efficiency a guide RNA targeting a cut <10 bp from the desired mutation should be used. For a heterozygous event...
  43. Choosing the B(right)est Fluorescent Protein: Photostability

    Type
    Blog Post
    ...different ways. We describe a number of issues with some of the experimental designs used to make these...of Amsterdam. The previous post in this series described a practical approach to selecting a bright fluorescent... protein. Photobleaching is the irreversible destruction of a fluorophore under the influence of light...photobleach at some point. For live-cell imaging, it is desirable to have fluorescent proteins that are photostable...photoswitching (Kremers et al, 2009), which usually are undesired properties. In the ideal situation, a fluorescent...large number of emitted photons before they are destroyed. Factors that affect photostability The photobleaching...fluorescence, which, in its simplest form, can be described by a mono-exponential decay (analogous to radioactive...
  44. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    ...SapTrap, the user first designs either oligos or synthetic DNA for the desired gRNA target sequence, as...specified by a guide RNA (gRNA) sequence. Users can design gRNAs to induce the break at a specific genomic...need for PCR or cloning, as digestion of the destination vector with SapI yields 2 sites- the first site...accepts the homology arm repair template. SapTrap includes a prebuilt donor plasmid library containing several... and a Cas9 expression plasmid will insert the desired genetic tag and marker sequence into the targeted... a tissue specific manner, as well as 3-site destination vectors for inserting a tag at multiple target... not work with C. elegans, several groups have designed modular toolkits to assist with tagging genomic...
  45. Immunology Research Plasmids and Resources

    Type
    Collection
    ...pathogen. It includes physical barriers such as the skin and mucosa, antimicrobial peptides and proteins...adaptive immune response is antigen-specific and includes cellular and humoral immunity. Once an adaptive...activate immune components that also lead to the destruction of pathogens. Over the course of an infection...immune response. Over 60 interleukins have been described. NK Cell Signaling Natural killer (NK) cells can... NENF neuron derived neurotrophic factor CIR2, NEUDESIN, SCIRP10, SPUF NGF nerve growth factor (beta polypeptide...immune response. Over 60 interleukins have been described. Symbol Name Synonyms EBI3 Epstein-Barr Virus ...applications in mammalian systems. The MXS-chaining kit includes chaining vectors with multiple cloning sites and...
  46. Evolution of Lab Techniques

    Type
    Blog Post
    ...the order of nucleotides in a string of DNA (7). Sanger sequencing uses modified nucleotides, called dideoxynucleotides...the widespread use of Sanger sequencing. Building upon this technology, radiolabelled nucleotides were...causes sickle cell anemia. The mutation happens to destroy a sequence recognized by the restriction enzyme...synthesis reaction along with all four regular nucleotides results in the synthesis of DNA strands of all...fluorescence activity as fluorescently labeled nucleotides are incorporated, a method called pyrosequencing...nanopore-based DNA sequencing which reads the nucleotides of a DNA strand as it slips through a tiny pore... the different electrochemical properties of nucleotides (8). Compared to older technologies nanopore-...
  47. A Needle in a Base-Stack: Cas9 Structural Biology

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    Blog Post
    ...Have you ever designed a CRISPR guide RNA and wondered why it is limited to only 20 bases, or why it’...understand the parameters of CRISPR experimental design. Let’s dive into some structural biology! Major... lobes, REC and NUC, and their subdomains. NUC includes the HNH and RuvC catalytic domains, as well as...as the CTD (also known as the PI), while REC includes most of the bridge helix. Created with BioRender.com...Fact! Even though the Cas9:RNA complex is well described in the closed conformation, recent electron microscopy... does not include stem loop 3, and guide RNA nucleotides 11-20 are not resolved due to structural disorder...2017). Within an interior cavity, Cas9 grips nucleotides 1-10 of the guide RNA, prearranged for base pairing...
  48. Deep Dive: qPCR

    Type
    Blog Post
    ...from Wong, 2018   Primers Design of primers and probes Primer design, of course, could easily be its...useful primer design resources in the References and Resource section. Validation Once designed, your primer.... For example, chemistries that rely on hairpin design of probes/primers often offer higher allelic specificity...Taqman) Low; can be reduced with a double-quencher design Yes, one Yes Yes Agarose gel or uMelt analysis...Reference Genes  Choosing a set of reference genes deserves more attention than it usually receives. Different... multiple reference genes whenever possible (Vandesompele, 2002), and it's possible to multiplex your ...documented in the literature, a geNorm study (Vandesompele, 2002) will help you select the appropriate ...
  49. CRISPR Between the Genes: How to Experiment with Enhancers and Epigenomics

    Type
    Blog Post
    ...this article, Quilt CTO Aneesh Karve, shows how to design experiments that work anywhere in the genome. Aneesh's...enhancers! This leads us to a three-step approach for designing an experiment to identify the critical NANOG binding...Find Enhancers that have NANOG binding sites 2. Design a CRISPR screen to target and disrupt the NANOG...anyone can find enhancers with Quilt. Seek and destroy enhancers with CRISPR Armed with the genome math...expression for NANOG enhancers, we’re ready for step 2: design a CRISPR screen to disrupt these enhancers. The...attenuated retrovirus in the same family as HIV. By design, our lentivirii are genetically programmed to CRISPR...Lentivirus from Addgene If you’re interested in designing your own CRISPR screens for enhancers, check out...
  50. Plasmids 101: Modular Cloning Applications and Kits

    Type
    Blog Post
    ...many MoClo kits are designed with specific model organisms in mind, others are designed for flexibility. ...Synthetic biology in bacteria MoClo is commonly used to design TUs and multi-TU constructs for synthetic biology..., biofuels, and natural products without the undesirable side products generated during chemical synthesis.... phaffii, then the MoClo YTK Kit specifically designed for S. cerevisiae is at your service (Lee et al...chromosomal integration and gene expression, the system includes a toolkit to express recombinant proteins within... are endless: genetic circuits with multiplexed guides, mini screening libraries, direct edit optimization.... The Fragmid kit described above works in both mammalian systems and Drosophila. Similarly, the Multi-Kingdom...
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