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We narrowed to 1,018 results for: LEA

Showing: 241 - 260 of 1018 results

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

    Type
    Blog Post
    ...additional nuclear localization sequences; and two mutations in Cas9 previously shown to improve nuclease activity...Previously developed genome editing methods using nucleases and base editors have the potential to correct...precise changes. However, the efficiency of Cas9 cleavage is relatively high while the efficiency of HDR...inhibiting this complex may allow time for 5′ flap exonucleases and DNA ligases to act first. PE4 and PE5, as...editing in mammalian cells: the small RNA-binding exonuclease protection factor La. They found that La, which... ~ ~ ~ ~ ✓   ✓ SV40 and c-Myc nuclear localization sequences Improve translocation ... R221K N394K Cas9 mutations Improve Cas9 nuclease activity ~ ~ ~ ~ ✓ ✓ ✓ Evolved...

  2. New and Upcoming Viral Vectors - September 2019

    Type
    Blog Post
    ...switch that expresses nuclear mCherry in the absence of Cre, and expresses nuclear EGFP in the presence...viral vectors. Here are some of the AAV we have released in the last few months. You can also browse our...testing purposes. To address this, we recently released our serotype testing AAV, which are small (20 ...continue to add more controls, and have recently released these controls: pAAV-hSyn-DIO-EGFP (50457-AAV5...and recombinase-dependent vectors. We recently released several recombinases in various serotypes, and...grow this collection. Of note, we are excited to release a Flp-dependent Cre AAV in AAV9 and AAVrg. See ...viral vectors 101 eBook Resources on Addgene.org Learn about Addgene's viral service Find viral protocols...

  3. Scientific Reproducibility - Focusing on Solutions at the Minisymposium on Reproducibility

    Type
    Blog Post
    ...reproducibility at Addgene and here I summarize what I learned both in preparation for my talk and at the minisymposium...science and research. Nonetheless, I’d like to steer clear of saying we have a reproducibility “crisis” on ...irreproducibility with some solutions based on what I’ve learned. I hope you can apply some of these solutions to...interactive protocols that make it much easier to learn new experimental techniques. Electronic lab notebooks...perfect story for a “high impact” publication can lead to the publication of rare flukes showing positive...begin requiring reproducibility checklists that at least make it obvious that reproducibility is a priority...performing experiments with too few replicates leading to suspect statistical significance (you can read...

  4. Easi-CRISPR: Generating Knock-In and Conditional Mouse Models

    Type
    Blog Post
    ...Previous Post on CRISPR Mouse Models Learn about Homology Directed Repair Learn about Cas9 Ribonucleoprotein ...previous methods yielding 1-10% knock-in. Read on to learn how you can make CRISPR mouse model generation easi-er...re fortunate that there’s a guide that directs cleavage right before the stop codon!  Figure 3:...arrows) and their PAM (bold highlighted text) and cleavage sites (slashes) are shown. In this case, the green... green guide would be selected, since it cleaves at the stop codon TAG. Design your repair template...Miura et al. (2018) recommend targeting sites at least 100 bp away from the target exon on either side....in a two-guide floxed experiment, if one guide cleaves less efficiently than the other, a partial insertion...

  5. Technique: Probe Phage Genomes for Host Binding Proteins

    Type
    Blog Post
    ... in order to protect their DNA from host cell nucleases (4). To further complicate matters, even when ..., and Szymanski in January 2016 in Viruses (5). Please refer to the paper for more details on the assay...short recognition sequence (like MluCI) that will cleave DNA frequently enough to result in a smear of fragments...inserts. We consider a library worth using if at least 40% of colonies tested showed correctly sized inserts...membranes will then be exposed to a lysis buffer to release recombinant proteins directly onto the nitrocellulose...solution-soaked filter paper (colony-side up) and leave for 1 h at room temperature. After this, it is helpful...min at 37°C (each repeated 5 times) works well. Leaving the membrane overnight in the freezer during one...

  6. Plasmids 101: Inducible Promoters

    Type
    Blog Post
    ... not be too leaky. For inducible prokaryotic promoters, pLac is known to be slightly leaky, and pBad is..., and light are all examples of factors that can lead to the induction of a promoter. Below, you’ll find... cAMP and represses pBad, decreasing promoter leakiness.   Other examples of chemically induced promoters...sensitive expression systems are typically less leaky than chemically induced promoters; they show near-zero...heat shock. In the case of Hsp70, the heat shock releases heat shock factor 1 (HSF-1), which subsequently... be compatible with your experimental system. Leakiness If you’re expressing a gene that may be toxic,...inducible promoters are also known for their low leakiness. Inducibility level How much do you want to induce...

  7. Kiran Musunuru on the Newest TALEN Genome-Editing System

    Type
    Blog Post
    ...Cell Stem Cell, Musunuru, Chad Cowan and their colleagues describe a much more efficient tool for doing...cells: a transcription activator-like effector nuclease (TALEN) kit consisting of 834 plasmids. The researchers...proteins that comprise a DNA binding domain and an endonuclease domain. What’s distinctive is that the DNA-binding... rest of the protein in place including FokI endonuclease domain as well as fluorescent proteins used ...first really popular tool was the zinc finger nucleases. Unfortunately, it is time consuming and difficult...without a lot of expertise to create zinc finger nucleases that will bind desired sequences. TALENs are much... genome. It remains to be seen which system is cleaner in terms of minimizing off-target effects, but ...

  8. 5 Steps to Writing Grant Proposals for Grad Students

    Type
    Blog Post
    ...first experience, I learned the details of grant writing, volunteered to take the lead on various applications... Thus, every single sentence and figure must be clear, concise, meaningful, and supportive of the mission...funded proposal will address these limitations and lead to new milestones in the field. Research strategy...that the goal and the impact of the project are clearly stated and align with the description of the RFA...see what tips they found useful. Step 4: Read and learn from the reviewers Reviewers may take 6-12 months...application. Although some comments may make it clear that the reviewer misunderstood the point that was... being made, take it as an opportunity to make clearer statements on the next round of applications. ...

  9. Google Forums Round Up: First Impressions of NgAgo

    Type
    Blog Post
    ...stage with much-lauded CRISPR-Cas9 is DNA-guided endonuclease NgAgo! We'll discuss how NgAgo is faring with...regions of the genome, which seem resistant to Cas9 cleavage (1). Both the CRISPR-Cas9 and NgAgo genome engineering...mammalian cells and one which diminishes the endonuclease activity of the enzyme. In vivo, only nascent...be rapidly degraded by the cellular machinery, leaving a small amount of active NgAgo/ssDNA complex in...manages to form a functional complex with ssDNA leading to inefficient downstream editing. Overall, the...suggestions and tips with #NgAgo The Addgene Blog - Leave suggestions and tips in the comments section below...someone came up with a mutant NgAgo (or a novel endonuclease) protein that can form a complex with a 5’-P-ssDNA...

  10. Anatomy of a Plasmid Page at Addgene

    Type
    Blog Post
    ...will be to your colleagues. If you ever have any questions about our plasmid pages, please don't hesitate...best use of all the information provided by your colleagues. Top of the plasmid page The ‘breadcrumb’ trail... is listed on the plasmid page.  The paper link leads to a page listing all the plasmids from this paper...References sections when citing the use of your colleague’s plasmid. Use the Addgene catalog number to easily...which experimental systems it was validated in.   Please keep in mind that all of the information on our...Check out Our Walkthrough of the Deposit Process Learn How We Do Quality Control at Addgene Resources ...Resources on Addgene.org Join the Addgene Community Learn the Benefits of Depositing Browse the Repository   ...

  11. Plasmids 101: Degron Tags

    Type
    Blog Post
    ...conditions, the protease cleaves itself and the degron off at the protease cleavage sequence. The tag is ...function, the SMASh tag self-cleaves itself when you want the protein around, leaving a minimal additional sequence...asunaprevir, the viral protease can no longer self-cleave and the protease and degron remain attached to ...protein-of-interest and the CRBN E3 ligase complex leading to ubiquitination and proteasomal degradation. ...HaloTag is quite large (33 kDa) and does not self-cleave off of the protein like the SMASh tag does. However...round of evolution (AID-2) to reduce some of the leakiness associated with the system, but the general concept...

  12. Typing CRISPR Systems

    Type
    Blog Post
    ...classification system for the array of CRISPR technologies. Learning the general principles of this classification ... Cas3. Cas3 functions as both a helicase and a nuclease, unwinding and cutting up DNA after recruitment...systems are also employed as CRISPR transposases, by leaving out Cas3. Type I is further subdivided into subtypes...and DNA, though it is largely believed that the cleavage of DNA is the primary function of this type of...consider to be an integral component of CRISPR — a nuclease effector. However, IV-C does in fact have a helicase...caused by Cas12 create short 3’ overhangs, which leads to slightly increased efficiency when conducting...and binds the RNA target before initiating RNA cleavage. Created with BioRender.com.   What’s your...

  13. With an Eye Towards the Future, We Look Back at the March for Science

    Type
    Blog Post
    ...for Science Learn How Future of Research is Advocating for Change Within the Sciences Learn How Changing...partisanship, including more scientists in our leadership, and raising awareness regarding the pitfalls... Nicholas Thompson is a PhD Candidate studying Nuclear Science and Engineering at Rensselaer Polytechnic...women of reproductive age live in a state with at least two abortion restrictions that conflict with scientific...local law enforcement, and, although there was at least one person vocally protesting us, he was not threatening...I marched to advocate for the process we use to learn about the world. In a way, I marched for truth. ...that I loved - there were booths for children to learn little things about science. We need to keep encouraging...

  14. 15 Hot Plasmids from 2017

    Type
    Blog Post
    ...C-terminal tags for mTagBFP, TagRFPt, EGFP, mVenus, mCerulean3, mKOFP2) and empty vectors that have standard...expression from these polycistronic cassettes could lead to comparable experimental results. Using PiggyBac...monocistronic expression of either variation of Klf4 did not lead to the observed reprogramming discrepancies. The...Listen to our mScarlet Podcast Segment    Photocleavable protein PhoCl expands optogenetics toolbox ... mechanism - the PhoCl protein is irreversibly cleaved when exposed to light. Robert Campbell’s lab illustrates...repository. These variants can be used as tools to learn about the influence of structure on an FP’s properties...results argue that transcription activation by SOX2 leads to its reprogramming effects. Plasmids from the ...

  15. Selecting Your Plasmid Purification Kit

    Type
    Blog Post
    ...bacteria to release the plasmid, separate the cell debris from the plasmid, and then clean-up the plasmid...the plasmid DNA itself, which can happen if you leave the sample in a lysis buffer for too long or if ...plasmid DNA from unwanted cellular “debris”; and then clean-up the plasmid DNA (Figure 2). For most kits, the...DNA. Image created in BioRender.com. For the clean-up stage, plasmid purification kits typically use...approaches involve binding the plasmid DNA from your cleared lysate to a substrate, washing away left-over debris...the columns can be “clogged” by excess material, leading to less DNA in your final eluate. Bead-based kits...blood, virus, or other samples, for PCR and gel cleanup, and for extracting RNA! (That’s a blog for another...

  16. Analyzing CRISPR Editing Results with ICE from Synthego

    Type
    Blog Post
    ...soon. To request other nucleases or other features and functionalities, please email [email protected] by Jessica Roginsky, Scientific Support Lead at Synthego. Article source: Step-by-Step Guide ...read the paper on bioRxiv.   Using the ICE tool Learning how to use the ICE software tool is quick and ...that need optimizing and no complicated steps to learn. For increased flexibility and scalability, the ...Protospacer Adjacent Motif (PAM) sequence for the nuclease used. Currently, ICE is configured for Cas9 fromStreptococcus...guaranteed editing with the CRISPR Gene Knockout Kit. Please contact us at [email protected] if you have ...guest blogger, Jessica Roginsky. Jessica Roginsky leads the scientific support team at Synthego. Her work...

  17. Twenty Years of Sharing: Expanding Accessibility

    Type
    Blog Post
    ...Everything I know about virus, I learned from Addgene,” or “I learned to clone from the Addgene website...country. In China, direct shipments weren’t able to clear import control. Partnering with a distributor allowed...repository by making it easier to find materials and learn about them. As early as 2007, we began grouping ...their lab, in their experiments, to enable virtual learning during the pandemic. Feedback like that lets us... not done yet… in fact, we may never be! We’ve learned that increased accessibility is achieved through...Through updating and expanding our website, we’ve learned about the importance of smaller, systemic changes...to easier, faster, more reproducible science and learn what Addgene can do to help. More resources on ...

  18. Twenty Years of Sharing: Addgene's Viral Vector Service

    Type
    Blog Post
    ...viral vector for our service; leave a comment; or take our AAV survey. Learn more about GCaMPs and other...editor of Addgene’s eBooks — including the recently released Viral Vectors 101 2nd edition — I was incredibly...in 2016. We realized we could apply the lessons learned from our plasmid lab to develop a reliable and ...It could be a matter of timing, as jGCaMP7 was released relatively soon after GCaMP6. It could be a matter... vector service. But in the years since, we’ve learned so much about what it takes to make these viral... Vectors 101 eBook and blog posts. The lessons learned from this process have shaped and supported our...growth and development. We’ve shared what we’ve learned, through manuscripts (Ersing et al., 2023; Haery...

  19. Hot Plasmids - August 2020

    Type
    Blog Post
    ...improve nuclear localization of fluorescent proteins, they found that adding a triple nuclear localization...ever like to write about a recent plasmid deposit please sign up here.  Here's what you'll find in this ...TEV), a highly sequence-specific protease used to cleave affinity tags from purified recombinant proteins...techniques to introduce time modulation of the TEV cleavage and improve utility of the system for use with...localize to the right places, which can provide misleading information on where exactly a structure or protein...found that too high expression of these markers can lead to non-specific labeling. They generated plasmids...includes 95 plasmids consisting of CRISPR/Cas nucleases, base editors, gRNA backbones, and promoters for...

  20. Lab to Office Culture Shock

    Type
    Blog Post
    ...thing. I experienced it, and many of my scientist colleagues have as well. Making the transition from the ...something. The thrill of having an experiment yield clear results and being the first, and for a very brief...family three times during a 10 minute conversation. Leaving a tight-knit team like that can and will be a little...world imagines when they think “scientist.” But leaving the bench does not mean you’re not a scientist ...culture shock above, but after polling some Addgene colleagues, we’ve come up with a list of things to consider... It’s a lot easier to manage your time. As my colleague Mike Lemieux told me, “I find that at a desk, ...non-scientists! Maybe you’ve just spent 5-10 years learning to “speak science,” and virtually every person...
Showing: 241 - 260 of 1018 results