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We narrowed to 798 results for: Cre

Showing: 121 - 140 of 798 results

  1. CRISPR 101: Validating Your Genome Edit

    Type
    Blog Post
    Published
    Nov. 3, 2022, 12:15 p.m.
    ...are ready to begin the screening process. Want to set yourself up for a screening success? Before you start...need to screen hundreds of clones looking for your edit of interest. For all of the screening strategies...phase of your experiment for a screening strategy. Restriction enzyme screening is sensitive to single base...needle in a haystack before going on to generate and screen individual clones. If a clonal line isn’t your ... isn’t a multiple of three will do. A popular screening method for knockouts is Tracking of Indels by ... the minimum number of clones you would have to screen to identify a knockout clone. For example, if your...interest. Thus, to find a null clone, you should screen, at the very least, 4 clones. Did you use a dual...

  2. Corralling and Cornering the Goldilocks Antibody

    Type
    Blog Post
    Published
    Aug. 9, 2022, 1:15 p.m.
    ...specific markers. The Screening Criteria While choosing which antibodies to screen, we kept in mind our...We therefore use both rAb and mAB in our screening. To screen the antibodies, we have developed a criterion...and his lab members (like me!) are dedicated to creating a public and accessible database for low-cost,...Initiative Cell Census Network, the Wu lab will be screening over 3,000 antibodies for use in mice and human...batch-to-batch variability found in polyclonal antibodies, creating a potentially unlimited supply of identical antibodies...antibodies; Addgene collaborates with these companies to create and provide general availability of their recombinant...to see the reproducibility and accuracy while screening. We also compare different clones of the same ...

  3. xCas9: Engineering a CRISPR Variant with PAM Flexibility

    Type
    Blog Post
    Published
    March 28, 2018, 6:52 p.m.
    ...genome-wide off-targets, since increasing PAM flexibility might also increase off-target activity. Surprisingly...gone one step further, using directed evolution to create xCas9, an enzyme recognizing a broad range of PAMs...PAMs like NG, GAA, and GAT, but also displaying increased editing specificity. We’re excited to learn more...easy, right? Yes and no. If you’re just trying to create a knockout, you might be happy targeting anywhere...precise edits or knock-ins. Editing efficiency decreases drastically once your cut site is more than 10...insertion site. Base editing, another method to create point mutations, also has a strict editing window... PAM sequences and/or broader PAM flexibility. Creating xCas9 through directed evolution Hu et al. used...

  4. CRISPR 101: Cytosine Transversion Editors

    Type
    Blog Post
    Published
    March 25, 2025, 1:15 p.m.
    ...nucleobase component of the nucleoside inosine. Created with BioRender.com. Although it was a huge ...it finds a PAM, Cas9 unwinds the adjacent DNA to create a region of separate strands called an R-loop (...of the enzyme. Figure 2: CRISPR R-loop. Created with BioRender.com. Base editors take advantage...activity window restricted to the stretch of ssDNA created by Cas9 binding. Pro tip! In CRISPR, the non-target...BER process was excising the incorrect U base, creating an “abasic,” or empty, DNA site, and then replacing...in the same journal on the same day.) This team created a similar construct that they called a Glycosylase...GBE, for its reliance on the glycosylase UNG to crease abasic sites (Zhao et al., 2021). Their GBE produced...

  5. RNA Interference in Plant Biology: New Tools for an Old Favorite

    Type
    Blog Post
    Published
    Oct. 27, 2020, 1:15 p.m.
    ...ones? Here, I’ll cover some screening methods to identify them. Visual screening Regardless of the RNAi-trigger...endogenous miRNA precursors can be engineered to created artificial miRNAs. The processed miRNA or siRNAs...conclusion was based upon numerous phenotype discrepancies between gene silencing and knockout methods ...RNAi in the context of a high throughput survival screen found that either technology was equivalently precise... can be divided into three fundamental steps: creation of the RNAi trigger delivering the RNAi trigger...the first stage of an RNAi-based investigation. Creation of the RNAi trigger requires a few initial considerations...these constructs include pGAPi, which allows easy creation of long hpRNA with Gateway-based cloning and straightforward...

  6. Antibodies 101: Antibody Engineering and Directed Evolution

    Type
    Blog Post
    Published
    Aug. 5, 2025, 1:15 p.m.
    ...be significantly increased through structural and functional optimization to increase the specificity ...efficiency! Screening mutant libraries After generating your mutant libraries, you have to screen thousands...and targeted delivery of treatments, ultimately increasing treatment effectiveness. How do you engineer ...single-domain antibody (often referred to as nanobodies). Created with BioRender.com.   Antibody directed evolution...generating the library of mutants and how they are screened. When conducting antibody evolution experiments...General process of antibody directed evolution. Created with BioRender.com.   Generating mutant libraries...insight, you can shrink your mutant library and increase the chances of finding beneficial mutations. In...

  7. Targeted Mutagenesis with EvolvR

    Type
    Blog Post
    Published
    Feb. 21, 2019, 1:15 p.m.
    ...modular nature, the Dueber Lab created a few versions of EvolvR. To increase the mutation rate of EvolvR,...bacteriophage T7 DNA polymerase increased the processivity of PolI3M, and thereby increasing the editing window of...forward genetics harnesses this at a large scale by screening diverse libraries of genetic variants. Several...nucleotides. Both the Bassik Lab and the Chang Lab have created methods that introduce diversification by targeting... integration of oligonucleotide libraries of a discrete size at the target site. The use of such libraries...occasionally introducing mutations (red nucleotide). Created with BioRender.com. The initial version of ...per generation of wild-type E. coli, while only increasing the standard mutation rate seen during DNA replication...

  8. Supporting Rare Disease Research with the 2020 BeHEARD Awards

    Type
    Blog Post
    Published
    Sept. 8, 2020, 2 p.m.
    ... Association for Creatine Deficiencies: Compensating for SLC6A8 mutations in Creatine Transporter Deficiency...SLC6A8 gene, also known as the creatine transporter. The Association for Creatine Deficiencies (ACD) is a parent-let...regeneration of ATP from ADP is creatine. In order to reach the brain, creatine needs to be transported from...Deficiency Creatine Transporter Deficiency (CTD) is a rare X-linked inherited neurometabolic condition and... and one of three Cerebral Creatine Deficiency Syndromes (CCDS) that present as global developmental delays... blood and cross the blood brain barrier using creatine transporters. However, mutations in the transporter...SLC6A8 impede this transport and result in global creatine deficiency, which is characterized by development...

  9. Viral Vectors 101: Preparing Pooled Libraries

    Type
    Blog Post
    Published
    July 13, 2023, 1:15 p.m.
    ...libraries here at Addgene, including cDNA, barcoding, screening, and gRNA libraries. Most of the pooled libraries...determined, larger lentiviral preps can be used for screening-scale transduction of cells, resulting in cell...library. These cells can then be used for genetic screening, followed by sequencing and further data analysis...some of your plasmids didn’t amplify after your screen is completed!  Producing Your Lentiviral Library... any issues.  Keep in mind that a low MOI will increase the chances of a cell being infected by only one... one viral particle, but it also increases the chances that a cell doesn’t get infected at all. To make...as seeding density and reagent concentration.  Screening time Phew! You are now (finally!) ready to use...

  10. Hot Plasmids - December 2019 - CRISPR pooled library, LipoGlo, CRISPRa, and Voltage Imaging Tools

    Type
    Blog Post
    Published
    Dec. 10, 2019, 1:58 p.m.
    ...pooled libraries have been created in lentiviral systems for mammalian screens, which enables researchers... as the screen readout. This retroviral mouse CRISPR pooled library can be used for screening of cells...pooled libraries are popular tools for genetic screens, enabling genome-wide interrogation of the genes...required for cellular processes. For a successful screen, it is necessary to identify the gRNAs that elicit...are poorly transduced by lentivirus, and thus screening with available CRISPR libraries was not possible...solve this issue, Sarah Teichmann and colleagues created a retroviral CRISPR knockout library using gRNAs... from mice that constitutively express Cas9 and screen for genes that affect Th2 differentiation and activation...

  11. How to Negotiate a Successful Lab Start Up Budget

    Type
    Blog Post
    Published
    Sept. 1, 2015, 2:30 p.m.
    ...goals and the resources. Instead of creating a start up budget, create a start up list.  In this post we...award by giving you step by step instructions on creating a budget, making decisions based on that budget...budget, and negotiating in regards to the budget. Creating a budget We start by using your research specific...budgetary needs from your experimental goals. When creating your budget, you should take the following steps... that timeline Avoid writing down prices as you create your list. This helps to ensure that all of the...”, “colony”, etc. This will help save time by screening out irrelevant candidates, and, more importantly...doesn’t have to be complicated, or difficult to create this list. Start BEFORE searching for a faculty...

  12. Stabilized Bacterial Promoters: Constant Gene Expression at any Copy Number

    Type
    Blog Post
    Published
    Sept. 4, 2018, 12:53 p.m.
    ...gene expression. By itself, increasing the copy number of a gene increases its expression. However, if...as plasmid copy number increases, the amount of repressor protein also increases thereby intensifying repression...When they increased concentrations of IPTG, a constitutive promoter upstream of GFP increased expression...that is responsive to a repressor protein, the increase in expression due to copy number is kept in check...origins of replication, the stabilized promoters created by Segall-Shapiro et al. showed nearly no position-dependent...stationary phase, the number of plasmids per cell increases 4-5 fold (for pUC plasmids) or ~2 fold (for p15a...compared to a constitutive promoter. To simulate the increase in plasmid copy number during the transition to...

  13. Design Tips for Prime Editing

    Type
    Blog Post
    Published
    Jan. 23, 2025, 2:15 p.m.
    ... edited. Created with BioRender.com. Add silent mutations near point mutations to create 3-base (...target can increase the odds of incorrect editing outcomes, especially when MMR is inhibited. Created with ...edit. Figure 1: Prime Editing schematic. Created with BioRender.com. The pegRNA specifies both...PBS) and reverse transcriptase template (RTT). Created with BioRender.com. The first base of the ...to Cas9 with canonical sgRNA structure (right). Created with BioRender.com. What to edit The sequence... mismatched bases can often evade MMR (right). Created with BioRender.com. For specific prime editing...nicking sgRNAs ~50 bp from the prime editing nick. Created with BioRender.com. PE3b and PE5b: In this...

  14. How to Design Your gRNA for CRISPR Genome Editing

    Type
    Blog Post
    Published
    Sept. 24, 2020, 1:15 p.m.
    ...engineer specific DNA edits and to perform functional screens to identify genes involved in a phenotype of interest...sequence preferences must largely be ignored. Created with BioRender.com. The hammer: Gene knockout...terminus of the protein, to maximize the chances of creating a non-functional allele. For a 1 kilobase gene...primary importance (more on this below). Created with BioRender.com. The jigsaw: Editing by ...the need for single cell cloning and subsequent screening for successful edits. This is a very time consuming...constrained by the desired location of edit; efficiency decreases dramatically when the cut site is >30nt from the...options that can greatly expand gRNA options. Created with BioRender.com. Two newer technologies ...

  15. CRISPR 101: Epigenetics and Editing the Epigenome

    Type
    Blog Post
    Published
    June 24, 2020, 5:45 p.m.
    ...activation. Created with BioRender.com. Tet1 demethylase Ronggui Hu’s lab has created pdCas9-Tet1-...targeted demethylation is associated with increased transcription. Created with BioRender.com. Tet1 initiates...the catalytic domain of p300 acetyltransferase increases levels of H3K27ac histone modification at specified...This plasmid is used with pcDNA3.1-MS2-Tet1-CD to decrease methylation and activate transcription. A lentiviral...DNA oxidation and repair factors that allow for increased gene activation at the targeted site compared ... of transduced cells. Grant Challen’s lab also created constitutive (pCMV-dCas9-D3A) and Tet-dependent...is associated with transcriptional repression. Created with BioRender.com. DNA Methyltransferase MQ1...

  16. Transferable Skills: Negotiation

    Type
    Blog Post
    Published
    March 3, 2022, 2 p.m.
    ...closer to an innovative resolution. Creative negotiation can also decrease or entirely eliminate the feeling...and everyone leaves unhappy.   Negotiation as a creative problem-solving process Although at first glance...negotiating, what if we instead approached it as a creative problem-solving exercise? Asking questions like...involved and be used as a guide to point you toward a creative solution where everyone wins. What are the underlying...but still be beneficial to both.  Coming up with creative solutions where everyone wins can initially feel...person. It can especially be difficult to think creatively when you are in the middle of a frustrating situation...practice will make negotiating feel more natural. Creative negotiation skills will help you strengthen relationships...

  17. Plasmids 101: Using Transposons in the Lab

    Type
    Blog Post
    Published
    July 6, 2021, 1:28 p.m.
    ...of themselves. This increases the number of copies of the TE while also increasing the size of their host...mutagenesis screens that detect loss-of-function or gain-of-function mutations. In these screens, the transposons...transposon for a mutagenesis screen. For example, piggyBac and Tol2 are best for screening promoters and enhancers...Then they can be inserted into new target sites. Created in BioRender.com.   Class II TEs: DNA transposons...which produces a target site duplication (TSD). Created in BioRender.com.   Autonomous vs. non-autonomous...capacity >100 kB, although integration efficiency decreases with cargo size. Sleeping Beauty has a close-to-random...can deliver 10-11 kB to mammalian cells without decreased efficiency, with a maximum cargo capacity of ~...

  18. Tips and Tricks for Using Golden Gate Modular Cloning (MoClo)

    Type
    Blog Post
    Published
    July 8, 2025, 1:15 p.m.
    ...round, due to the decrease in ligation efficiency. To combat this, you can increase the volume of competent...other independently regulated transcription units. Created with BioRender.com.   Planning makes perfect... to any tags or fluorescent markers? If you’re creating a multigene construct, in what position do you...stop codon; TAG, C-terminal tag; TER, terminator. Created with BioRender.com. The Sainsbury Laboratory...as well as the restriction enzymes, and it will create the resulting plasmid map and identify any mismatches... new bacterial cultures from your kit plate and create your own glycerol stocks for more frequent use....the MoClo assembly levels, you will be using an increasing number of parts in your one-pot one-step reactions...

  19. Tips for CRISPR Gene Editing in Mice

    Type
    Blog Post
    Published
    June 28, 2016, 10:59 a.m.
    ...during your in vivo work is to screen you gRNA in vitro first. In vitro screening is a simple and fast method...Researchers are now using this system in ever more creative ways, (Wang et al., 2013, Cho et al., 2014). There...has been quite successfully adapted for use in screening experiments as well). Therefore, if you’ve started...previously validated gRNAs at Addgene. In vitro screening for the best gRNA Figure 1: Validation ...gRNAs to Target Mouse Genes To begin the in vitro screening process, you should first develop primers to the...same time, and choose the most effective ones to increase your chances of gene modification in vivo. Find...embryos to develop. Once they are born, it’s time to screen them for your desired edit. Good news! Remember...

  20. Avoiding the Dark Side of Fluorescent Protein Fusions with mOX FPs

    Type
    Blog Post
    Published
    Oct. 27, 2015, 3 p.m.
    ...compose the secretory pathway, endocytic vesicles, mitochondria, lysosomes or they are secreted into the ...your cloning strategy and decide whether you will create an N- or C-terminal fusion based on your experimental...residues form inappropriate disulfide bonds in the secretory pathway (Figure 1) [4,6–8]. Additionally, FPs ...and a sequence intended to localize them to the secretory pathway, a dark pool that is mislocalized to the...misfolded, blocked from proceeding through the secretory pathway, and retained in the ER. FPs have been...recent publication illustrated the quantitative increase in fluorescent signal achieved when utilizing ...optimized moxFP as opposed to standard FPs. The increase in signal is not due to a brighter FP, but rather...
Showing: 121 - 140 of 798 results