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  1. Protein Tagging with CRISPR/Cas9: A Conversation with Mendenhall and Myers

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    Blog Post
    ...Mendenhall: The benefits are two-fold: CRISPR/Cas9 offers high efficiency of inducing double strand breaks and ...weeks. CRISPR saves you a couple of months. It’s higher throughput and faster. It’s also easy to run things...transcription factors, but there are many reasons you might want a system like this. It’s actually surprising...with this antibody problem. We thought it was the right thing to do to put these out there. It’s a simple...
  2. Will You Be My Mentor? Finding and Asking for Mentoring Support

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    Blog Post
    ...interested in following? Someone you admire for their insight and way of expressing it in meetings? The more ...advice. Your family and friends know you well and might have good ideas for who you should connect with....cautious and make sure to choose one that comes highly recommended from someone you trust. A good coach...compliment to ask someone to share their wisdom and they might just not have the time. Thank them anyway and move...
  3. Rosella: A Fluorescent pH-Biosensor for Studying Autophagy

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    Blog Post
    ...neutral pH compartment, ­­like the cytosol, to the higher pH of the vacuole. Read on to learn more about ...enzyme. Pho8 phosphatase activity or the molecular weight shift of Pho8 from its uncleaved to cleaved form... dual color-emission biosensor named after the brightly-coloured Australian parrot. It’s comprised of ...Oligomerization Seeing Red: Simple GFP Photoconversion Light Sheet Fluorescence Microscopy Additional Resources...
  4. CRISPRainbow and Genome Visualization

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    Blog Post
    ...cyan, or magenta light. A gRNA with all 3 distinct hairpin sequences produces white light. Created with ...from red, blue, and green channels overlaid on a bright-field image. Image from Ma et al, 2016. Using... A gRNA with all three hairpins generates white light. All 6 gRNAs can be expressed in a single vector...
  5. RANbodies: Reporter Nanobody Fusions

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    Blog Post
    ... is weaker than reporter staining. Picking the right reporter for your RANBody While all three reporters... fluorescently labeled tyramide molecule into a highly reactive radical, which is then covalently linked...antigens. Spaghetti Monster Spaghetti Monsters are highly antigenic tags that have 10 HA or 10 MYC tags built... plasmids from Penn State Need help picking the right fluorescence microscopy technique to use? Check ...
  6. All in a Twist: dsRNA

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    Blog Post
    ...RNA! Double stranded? Well, that’s just for DNA – right? RNA performs almost all of its biological functions...replication process. dsDNA viruses yield dsRNA through a slightly different mechanism thought to be associated with...always around. R-loops are particularly enriched in highly transcribed regions and repetitive regions, such...RNA:DNA hybrids levels are allowed to reach very high or low levels, possibly due to dysregulation of ...
  7. What's New in CRISPR - November 2021

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    Blog Post
    ... edition of “What’s New in CRISPR” - where we highlight a few of the newest CRISPR plasmids available ...cells. The “V4” version (named CasMINI) had the highest activity for gene activation  and base editing,... not modify the Cas12f1 enzyme. The result is a highly efficient Cas system with very compact genome editors...
  8. Troubleshooting Your Plasmid Cloning Experiment

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    Blog Post
    ...result in any cells, or all the colonies screened might not contain the correct plasmid. There’s a lot that... 24 bp with the template and if the sequence has high GC or AT content, increase the overlapping region...Full lawn of cells. The antibiotic in your plate might not work. Check the plates! Streak on them an E....t get any positive clone after these steps, you might want to reconsider your approach, and try a different...
  9. RaPID Detection of RNA-protein Interactions

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    Blog Post
    ...interactions by cross-linking RNAs and proteins with UV light, followed by an antibody pulldown of a protein of...for Affinity Purification (CRAPome), to identify highly biotinylated background proteins reported by other...and identified QKI, an RNA-binding protein that’s highly expressed in neural progenitor cells. Knock-down...Response Element (IRE) RNA motif of the ferritin light chain RNA transcript. IRE motifs are bound by IRE...
  10. Addgene's Tips for Plasmid Quality Control

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    Blog Post
    ...plasmid verification, and using NCBI BLAST. Tips for high-throughput plasmid sequencing If you’re like us,...Sanger sequencing is done from glycerol stocks (overnight cultures with 15% glycerol), as opposed to purified...handling of large numbers of samples. When we grow overnight cultures for glycerol stock production and storage...can make your life much easier by selecting the right primer. This often starts by determining what features...
  11. Design Tips for Prime Editing

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    Blog Post
    ...location bind to Cas9 with canonical sgRNA structure (right). Created with BioRender.com. What to edit The...3 or more mismatched bases can often evade MMR (right). Created with BioRender.com. For specific prime...prime editors bound to sgRNAs only drive nicking (right). Start with nicking sgRNAs ~50 bp from the prime...2024). Figure 9: epegRNAs (left) and PE7 (right) offer two different strategies for protecting pegRNAs...
  12. CRISPR 101: Targeting Non-Coding RNAs with CRISPR/Cas9

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    Blog Post
    ...genome is made of protein-coding genes, and you might be wondering what the rest of our genome could possibly...non-coding RNAs! You probably didn’t see that coming, right? Non-coding RNAs (ncRNAs) are transcribed but do...versatile option. It can be used to target lncRNAs with high specificity, particularly in applications requiring...Hazan J, Bester AC. CRISPR-Based Approaches for the High-Throughput Characterization of Long Non-Coding RNAs...
  13. Plasmids 101: The Wide World of Natural Plasmids

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    Blog Post
    ...just for lab specimens — there is evidence that lightning can also promote gene transfer in soil bacteria...microbial offense One way to triumph over your neighbors is to eliminate the competition, and Penicillium...specialized degradative capabilities are often tightly regulated to be active only in the presence of ...Simonet, P. (2001). Laboratory-scale evidence for lightning-mediated gene transfer in soil. Applied and Environmental...
  14. Making CRISPR Plasmids Using Fragmid

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    Blog Post
    ...If you’ve ever been looking for just the right CRISPR vectors on Addgene and found instead ones that ...Doench reports even the greenest members of his lab, high school interns, were able to use Fragmid to design...making it easier to get the vectors that are just right for your experiment. As always, we recommend checking...components by clicking the blue text in the upper right-hand corner.      Step 3: Reviewing the ...
  15. Synthetic promoter AAVs for cell-type specific expression in retinal cells

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    Blog Post
    ...initiation sites of at least two genes with high expression and high cell-type specificity.  Strategy #3 (ProC...promoter designs, promoters from strategy #4 had the highest rate of targeted expression. Surprisingly, <1% ...tracing experiments: While synthetic promoters with high rates of labeling are ideal of gene therapy applications...
  16. A Guide to Designing a Scientific Poster: Content, Layout, and More

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    Blog Post
    ...acknowledgements sections. Some other additions you might wish to include are a references section, contact...navigate the poster from column to column left-to-right, which is the natural way that people expect to ...illustrations above) so that the color fades to a lighter or darker version of itself from the top of the...sure that the color of your font is compatible. Use high-contrast between these colors so that your text ...
  17. Popular Retroviral Vectors and Their Uses in Scientific Research

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    Blog Post
    ...systems Gamma-retroviral vectors have a relatively high transduction efficiency, but in contrast to lentiviral...small-molecule libraries and can be combined with high-throughput sequencing to perform multiplexed analysis... cassette. It can be used to produce a ~10-fold higher titer of lentiviral particles than the original...lentivirus provides significant genetic power and allows high throughput genetic modulation studies in mammalian...
  18. Cpf1 Update: Comparison to Cas9 and NgAgo

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    Blog Post
    ...NGG) in both distribution and GC-content, which might improve editing in AT-rich genomes. Additionally...editing efficiency for the Cpf1 orthologs was only slightly lower than that of the widely used SpCas9 and ...that AsCpf1’s off-target rate is similar to that of high fidelity Cas9s eSpCas9 and SpCas9-HF1. Both AsCpf1... cleaves relatively far away from the PAM, NHEJ might retain the PAM site. Therefore, if HDR does not ...
  19. Plasmids 101: Terminators and PolyA signals

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    Blog Post
    ...elements. A high affinity terminator may be desired for multi-cistronic constructs where high termination...terminators, such as T7 and rrnB, as well as engineered high-efficiency terminators such as T0. Rho-independent...poly-uracil tract as shown in the figure to the right. The tertiary structure of the hairpin-DNA complex...
  20. Tips for Titering Your Lentiviral Preps

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    Blog Post
    ...RNA. Measuring p24 levels in a viral prep is straightforward and rapid as there are several commercially...Studies have found that values can be 10-1000 fold higher than for functional assays depending on the vector... collected lentiviral prep may be significantly higher than the same prep that has been stored in the ...routinely produce virus may want to choose more straightforward approaches such as the FACS-based or colony-forming...
  21. Fluorescent Proteins 101: Fluorescent Protein Timers

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    Blog Post
    ...organelle, and protein localization. For instance, you might dye your cells and look at them under a microscope...population of timer indicates the age of the pool: the higher the ratio, the older the pool. FP timers have ... al. Protein Excitation (nm) Emission (nm) Brightness pKa Maturation Plasmids Fast-FT 403 (blue),...sections are formed. In synthetic biology, FP timers might be able to tell researchers whether old or new cells...
  22. Degrading DNA with Cascade-Cas3

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    Blog Post
    ...Cas effectors to light. One lesser-known Cas is waiting for its chance in the spotlight — Cas3. Cas3 can...Cas effectors can’t, while maintaining relatively high efficiency. These alterations are achieved through.... E., Bravo, J. P., Ramos, D., Hibshman, G. N., Wright, J. T., & Taylor, D. W. (2023). Structural snapshots...
  23. Plasmids 101: Degron Tags

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    Blog Post
    ...added to media, buffer, etc., which will bind and light up a tagged protein for imaging. Given its popularity... like the SMASh tag does. However, it is a straightforward system – HaloTag and its PROTAC are all that...tag Are all tags created equal? No! Choosing the ‘right’ tag does depend a lot on your unique experimental...function is easily perturbed by tags, then a small tag might be the way to go (dTAG/SMASh). If you don’t want...
  24. Transferable Skills: Negotiation

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    Blog Post
    ...At Addgene, we've set out to fill this gap by highlighting that researchers learn many transferable skills...the lab and by offering advice on areas where you might need some help. Today in our transferable skills...Although this approach to negotiation is the most straightforward, it can mean that everyone leaves disappointed...
  25. Mobile-CRISPRi: Bringing CRISPRi to Diverse Bacteria

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    Blog Post
    ...the Mobile CRISPRi cassette flanked by left and right Tn7 end sequences. Donor bacteria with a chromosomal...scheme. Mobile-CRISPRi integrates downstream of the highly conserved glutamine-fructose-6-phosphate aminotransferase...cell, the CRISPRi DNA (purple) flanked by left and right Tn7 end sequences (green) integrates downstream ...mirabilis, had only ~1 transfer per 1,000,000 colonies. Higher transfer rates are better suited for genome-wide...
  26. Starter guide to induced pluripotent stem cells (iPSCs) part 1:  A renaissance in regenerative medicine

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    Blog Post
    ...of them: Characteristic ESC ASC Self-renewal High Low once isolated from the human body Usage Universal...specific cell types can be produced Ethical concern High. Embryos are destroyed during ESC isolation. Low...post-transplantation rejection when used therapeutically High Low (if ASCs are isolated from the patient) For...each other in many aspects. Like ESCs, iPSCs have a high self-renewal rate and can be used universally to...
  27. Google Forums Round Up: First Impressions of NgAgo

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    Blog Post
    ...but, to start, let's review why NgAgo is in the spotlight and take a moment to remember that NgAgo has only...a single experiment. Also, the NGG PAM sequence might not always be available at an optimal distance from...mean the technology is dead in the water. On the bright side, successful indel generation and epitope knockin...supposedly alien 5’-phosphorylated ssDNA guides, which might be rapidly degraded by the cellular machinery, leaving...
Showing: 541 - 570 of 980 results