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  1. Easing the Protein Purification Process with pCri

    Type
    Blog Post
    Published
    June 19, 2015, 3:08 p.m.
    ...the tag post-purification. A sample of pCri constructs: pCri-1a, -4a and -9a. 6xHis tags enable affinity...formation. pCri also includes a special feature for difficult-to-purify membrane proteins. pCri vector pCri...thorough introduction to pCri, please see the original publication cited below. pCri plasmids are available...which gives you the most functional protein. The pCri system, recently deposited to Addgene by F. Xavier...purification through simple and efficient multiplexing. pCri plasmids are divided into two sets, each of which... information on these and other tags used in the pCri system, please see Plasmids 101: Protein Tags. ...purifying from Bacillus subtilis and Pichia pastoris pCri also includes plasmids designed for protein expression...
  2. Viral Production at Addgene

    Type
    Blog Post
    Published
    Oct. 24, 2023, 1:15 p.m.
    ...preparation undergoes PCR with primers targeting the transfer plasmid used in the transfection. PCR products are... AAV particles are titered by droplet digital PCR (ddPCR) using primers and probes targeting the ITR elements...are titered using a lentiviral droplet digital PCR (ddPCR) titration protocol (modified from Wang et al... 4: Schematic of the barcode matching system and PCR-based confirmation of transfer plasmids used in Addgene...transfer plasmid in the viral preparation by performing PCR against unique regions of the transfer plasmid. ...adeno-associated viral vector genome titers by droplet digital PCR. Human Gene Therapy Methods, 25(2), Article 2. https...Lentiviral Infectious Titer by a Novel Droplet Digital PCR Method. Human Gene Therapy Methods, 29(2), 96–103...
  3. GPCRs: How Do They Work and How Do We Study Them?

    Type
    Blog Post
    Published
    Feb. 11, 2021, 2:15 p.m.
    ...five senses? GPCRs or G-protein-coupled receptors (GPCRs)! Aside from these three senses, GPCRs play roles...signal through more than one subtype. How GPCR signaling works GPCR signaling is initiated when a ligand binds...extracellular surface of the GPCR. This results in a conformational change in the GPCR causing the activation... Addgene Tools for Studying GPCR signaling  So with the hundreds of GPCRs out there, how can scientists...activate many GPCRs are still unknown. To identify some of these unknown ligands and their GPCR binding partner...120 known GPCR targets demonstrating its potential to discover new ligands for unknown GPCRs. You can ...our blog post on GPCR signaling using TRUPATH for more information on this system! GPCR-APEX: Interested...
  4. Tips for a 1st Time CRISPR User (by a 1st Time CRISPR User)

    Type
    Blog Post
    Published
    March 7, 2017, 3:30 p.m.
    ...BRAF gene edit, simply PCR-amplify the BRAF locus from the edited cells (the PCR product should contain...edited BRAF sequence), and PCR-amplify the BRAF locus from control cells (the PCR product should contain ...t in the middle of the PCR product. If the mismatch is in the middle of the PCR product, you would expect...primers flanking my edits in genomic DNA and doing PCR on genomic DNA. The surveyor assay itself was relatively...contain the wild-type BRAF sequence). Then, mix the PCR products and use temperature to denature and renature...want to put the digestion site in the middle of the PCR product, you would still be able to identify the ...and run it as an undigested control. Sometimes the PCR products can look smeared, so having an undigested...
  5. Pushing the Limits of DNA Assembly

    Type
    Blog Post
    Published
    Sept. 6, 2017, 1:01 p.m.
    ..., performing PCR to generate the mutation and linearizing your vector (preferably by PCR) for DNA assembly...Regions of homology can be introduced to fragments via PCR using primers that contain the regions of homology...as fragments are added, deleted, or reordered and PCR enzymes are adjusted. Appropriate fragment and primer...scarless DNA – perfect for transforma­­­tion or as a PCR template. Some of the applications of the NEBuilder... Based Cloning Methods Screen Plasmids by Colony PCR Addtional Resources on Addgene.org Browse Our CRISPR...
  6. Evolution of Lab Techniques

    Type
    Blog Post
    Published
    June 21, 2016, 2:30 p.m.
    ...replaced by real-time PCR to answer the same experimental questions. Real-time PCR detects and quantifies.... Southern blotting and quantitative real-time PCR Southern blotting, named for its inventor Edward ...process, rather than just at the end as in standard PCR. This allows the researcher to compare different ...requires a large amount of high-quality DNA, real-time PCR has several advantages including easier automation... have a lower false positive rate than real-time PCR (4). Restriction mapping and modern sequencing Restriction...Speleman, and Jo Vandesompele. "Real-time quantitative PCR as an alternative to Southern blot or fluorescence... Sequencing Results Check out Plasmid Cloning by PCR Resources on Addgene.org Check out Our Protocol...
  7. Plasmids 101: Gibson Assembly and Other Long-Homology Based Cloning Methods

    Type
    Blog Post
    Published
    March 1, 2016, 3:30 p.m.
    ...homology at their ends, which are typically created by PCR. Then, the fragments are incubated together with ...between neighboring fragments can be created via PCR amplification with primers that contain the appropriate... NEB have tools that help you design primers for PCR amplification of fragments to incorporate such regions...Then you would amplify the fragments and vector by PCR, verify that you have bands of the correct size, ...contains a lot of repeats--any of which could make the PCR step difficult--OR there is no convenient restriction... case, rather than using a restriction enzyme or PCR to make linearized vector, the Cas9 enzyme along ...using Gibson assembly. In this case the vector was PCR amplified to contain regions of homology with the...
  8. Editor's Choice, August 2016

    Type
    Blog Post
    Published
    Sept. 2, 2016, 1:32 p.m.
    ...troubleshoot the system. Site Directed Mutagenesis by PCR & Single Base Editing with CRISPR For my editor’s...provides a thorough walkthrough of how you can use PCR to make small sequence changes to plasmid DNA. This...may make some uses of Site Directed Mutagenesis by PCR obsolete! Honorable mentions Of course we’ve had ...chronological order here: Site Directed Mutagenesis by PCR Google Forums Round Up: First Impressions of NgAgo...
  9. Building and Validating Recombinant Antibodies: A Case Study

    Type
    Blog Post
    Published
    April 5, 2022, 1:20 p.m.
    ...generate cDNA, which  was used as a template for PCR amplification with a degenerate primer set to amplify... and variable heavy (VH) chain sequences. Fusion PCR was performed to create an amplicon that  was cloned...by both diagnostic restriction digest and colony PCR.   Fig. 1: (A) Schematic of cloning, expression... for some constructs more than 90% of the colony PCR validated clones unexpectedly failed to produce functional...chain sequences. By performing a BciVI digest of the PCR products prior to cloning, which in most cases left...
  10. Plasmids 101: Gateway Cloning

    Type
    Blog Post
    Published
    Jan. 12, 2017, 3:30 p.m.
    ...of an attB-PCR product or plasmid with an attP donor vector. In this case, we would use PCR to add attB...an entry clone: recombination of an attB-flanked PCR product with an attP-containing donor vector. ...the same tube, speeding up the cloning of the attB-PCR products directly into destination vectors. The cloning...Universality All types of DNA fragments may be cloned: PCR fragments, cDNA or Genomic DNA and is available for...About Methylation and Restriction Enzymes Use Colony PCR to Quickly Verify Your Clones Resources on Addgene.org...
  11. Plasmid Grant to Aid Cervical Cancer Screening in Ghana

    Type
    Blog Post
    Published
    Nov. 8, 2016, 3:30 p.m.
    ...order plasmids she can use as positive controls in PCR-based cervical cancer screens. This third grant represents...for a limited group of Ghanaian women by including PCR screening for HR HPV alongside the cytological tests...variety of HPV genes as positive controls in her PCR screens. She hopes that these screens will both identify...
  12. SARS-CoV-2/COVID-19 Detection Methods Based on CRISPR/Cas

    Type
    Blog Post
    Published
    May 5, 2020, 1:15 p.m.
    ... the typical PCR machines, the authors use affordable, field-ready, Bluetooth-enabled PCR machines that...likely approximately 1-2 hours Equipment needed: Mini PCR machines by DIY-Bio, P51 cardboard fluorescence visualizer...reverse transcription. This is then amplified by PCR using Taq Polymerase and then transcribed to provide...Reverse-transcribed RNA samples are amplified by PCR instead of RPA. Unlike RPA, this technique uses Taq...Not mentioned, likely ~1-2 hours Equipment needed: PCR machines/Heat blocks, Lateral flow strips, Agarose...nucleic acids, the target sequence is amplified by PCR/RPA using biotinylated primers. These are then immobilized...controlling this pandemic. Currently, the CDC uses RT-qPCR tests to diagnose COVID-19 and some serological ...
  13. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    Published
    Oct. 12, 2017, 2:26 p.m.
    ...only be detected by labor-intensive processes like PCR or by evaluating visual phenotypes. Improving C. ... template (Fig. 1, Step 1). There is no need for PCR or cloning, as digestion of the destination vector...Foerstemann lab developed a polymerase chain reaction (PCR)-based system that allows users to generate a plasmid...homology arms and an N- or C-terminal tag. The two PCR reactions are then mixed and transfected along with...Drosophila S2 cell line stably expressing Cas9. This PCR toolkit offers C- and N-terminal tagging vectors ...
  14. Plasmids 101: Methylation and Restriction Enzymes

    Type
    Blog Post
    Published
    June 30, 2016, 2:30 p.m.
    ... by PCR generates mutated plasmids with no methylation (there are no methyltransferases in the PCR reaction...considered why DpnI will degrade your template DNA from a PCR reaction but not the newly synthesized product from...any GATC sequences found in the plasmid. When the PCR products are digested with DpnI, only the non-mutated...
  15. DNA Purification Without a Kit

    Type
    Blog Post
    Published
    Feb. 11, 2020, 2:15 p.m.
    ...purification Starting material: PCR product or agarose gel slices Product: purified PCR product or DNA fragments...released by dipping the cellulose directly into a PCR buffer, where DNA or RNA can be amplified. Compared...method for regenerating silica columns that come with PCR product purification or DNA gel extraction kits. ...Rapid Regeneration and Reuse of Silica Columns from PCR Purification and Gel Extraction Kits. Scientific ... still be eluted from the column, as detected by qPCR, but this did not reduce cloning efficiencies.  ...
  16. When Fidelity Matters: A frank discussion about ligase fidelity

    Type
    Blog Post
    Published
    March 6, 2018, 1:49 p.m.
    ..., Francis. "The ligase chain reaction in a PCR world." PCR Methods Appl 1.1 (1991): 5-16. PubMed PMID:...interest are annealed to target DNA (genomic DNA or a PCR amplified fragment) and treated with a high fidelity...chain reaction (LCR)-overview and applications." PCR Methods Appl 3.4 (1994): S51-64. PubMed PMID: 8173509...bacterial pathogens by use of a novel 16S rRNA gene PCR-ligase detection reaction-capillary electrophoresis.... 18. Hommatsu, Manami, et al. "Development of a PCR/LDR/flow-through hybridization assay using a capillary...Pushing the Limits of DNA Assembly Plasmid Cloning by PCR Resources on Addgene.org Basic Molecular Biology...but we can now use fluorophore- quencher pairs or qPCR-based methods to greatly increase the sensitivity...
  17. The time and cost required to make a plasmid

    Type
    Blog Post
    Published
    March 23, 2023, 1:15 p.m.
    ...Of course, this is for the simple insertion of a PCR product into a vector. The time it takes to make ...dramatically if you are piecing together several PCR products together. And this assumes you did everything...There are many strategies beyond the traditional PCR/digest/ligate methods and picking the right one can... plasmids in parallel. That way, you can run one PCR, one gel, etc. for multiple plasmids at once. Over...
  18. Recombinase-based State Machines Enable Order-dependent Logic in vivo

    Type
    Blog Post
    Published
    July 28, 2016, 2:30 p.m.
    ...and then we performed colony PCR on the register region and sent the PCR product for sequencing.  A less...register enables the design of primer pairs that PCR amplify in some states but not others. Because samples... likely not be homogenous for one state, regular PCR may not be very informative – each primer pair will...three-input GRSMs, we recommend using overlap extension PCR and Gibson assembly to piece together the registers... individual parts and/or strings of parts may be PCR-ed out of their current registers and used to build... expensive, then the qPCR method should be considered as an alternative. The qPCR method can be performed...single-cell) approach is to interrogate state with qPCR. The re-arrangement of DNA segments in each state...
  19. CRISPR Protocol for Genomic Deletions in Mammalian Cell Lines [Video]

    Type
    Blog Post
    Published
    Feb. 18, 2015, 3:09 p.m.
    ...polymorphism analysis, allele-specific PCR, T7EN1 cleavage assay, sequencing, RT-qPCR, or immunoblotting to detect...method allows for deletion screening by conventional PCR. Biallelically disrupted cells can be easily identified...cells via FACS, primer validation, and screening by PCR for biallelic deletion clones:    Like the video...
  20. Tag Your Favorite Yeast Genes with Ease

    Type
    Blog Post
    Published
    Nov. 19, 2013, 2:37 p.m.
    ...protocol is surprisingly simple, requiring only a PCR product containing the modifying sequence flanked...to the chromosomal site of insertion. The linear PCR product is introduced into the cell by direct transformation...selection marker (KanMX, HphMX, or His3MX).  Each PCR product from this collection will yield an insert...
Showing: 21 - 40 of 146 results