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Showing: 241 - 270 of 901 results
  1. Enhancing CRISPR Targeting Specificity with eSpCas9, SpCas9-HF1, & HypaCas9

    Type
    Blog Post
    Published
    Dec. 16, 2015, 3:30 p.m.
    ...on the Addgene Website Find CRISPR Plasmids Browse our CRISPR Guide Pages Find Genome Engineering Resources...combined with the weak separation afforded by gRNA binding at non-target sites would theoretically decrease... Figure 1: Strand separation and target DNA binding to the Cas9 nuclease. Stable strand separation ...similarly thought that if they could weaken sequence independent interactions between Cas9 and DNA, then they ...SpCas9-HF1 each stall in an inactive form after binding to a target site and propose that this stalling...Science (2015): aad5227. PubMed PMID: 26628643. Find plasmids from this publication at Addgene. 2. Nishimasu...effects." Nature (2016).  PubMed PMID: 26735016. Find plasmids from this publication at Addgene. 5. Chen...
  2. Human Germline Editing Using CRISPR

    Type
    Blog Post
    Published
    Aug. 10, 2017, 2:19 p.m.
    ...controls.) 27.6% of embryos carried indels at the mutation site, indicating that repair proceeded through NHEJ...move forward from this work. Experiments & major findings Let’s start with the paper itself: Ma et al. were...electroporated them with an ssODN repair template in induced pluripotent stem cells made from the patient. With...allowing repair to take place before DNA replication. Indeed, they observed that 41/42 embryos were non-mosaic...using the provided ssODN template. In fact, this finding led the authors to title the paper “Correction ...pre-implantation genetic diagnosis (PGD) screens embryos to find those that do not carry a given dominant disease-causing...pregnancy, the researchers were able to examine each individual blastomere to determine its genotype. However...
  3. New Tool for Lineage Tracing: The ClonTracer Library

    Type
    Blog Post
    Published
    Sept. 22, 2015, 2:30 p.m.
    ...Screening Kit Find Out How to Best Utilize Our Cancer Resource Pages  Resources at Addgene Find the ClonTracer...exciting new tool that allows researchers to individually label millions of mammalian cells through lentiviral...Novartis because she wanted first-hand experience in industry research. When she came to Novartis, she was happily...these groups with the same drug regimen, they would find one of two outcomes (see schematic depiction below...ClonTracer library allows a researcher to label individual members of a starting population of cells with...multiplicity of infection (MOI) such that each individual cell receives only one barcode. The abundance...is a “really great way of broadly sharing these kinds of reagents.” Here at Addgene, we’re excited to ...
  4. Plasmids 101: Cre-lox

    Type
    Blog Post
    Published
    Jan. 13, 2015, 3:47 p.m.
    ...: PMC49604. 4. Independent control of immunoglobulin switch recombination at individual switch regions...PMID: 8513499. Resources on Addgene.org Find Cre plasmids Find loxP plasmids  ...-lox system is a technology that can be used to induce site-specific recombination events. The system ...key advantage of the system is that Cre acts independently of any other accessory proteins or co-factors...recognition sequences consisting of two 13-bp long palindromic repeats separated by an 8-bp long asymmetric ...certain stages of development, or by making the Cre inducible (such as with tamoxifen or doxycycline), the Cre...unique asymmetric spacer "NNNTANNN", where "N" indicates which bases may vary from the canonical sequence...
  5. Plasmids 101: Terminators and PolyA signals

    Type
    Blog Post
    Published
    March 31, 2016, 2:30 p.m.
    ...secondary structure to induce transcript cleavage, similar to the Rho-independent termination found in ...two general categories: rho-dependent and rho-independent. Rho factor is a helicase which assists RNA polymerase...common bacterial expression plasmids use Rho-independent terminators, which include naturally occurring... high-efficiency terminators such as T0. Rho-independent termination is also known as intrinsic termination...secondary structure and sequence conserved Rho-independent termination annotation for 90 bacterial elements...CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=39322032   No terminator is 100% efficient... than Polymerases I and II, which both require binding of termination factors. Although both are termination...
  6. Getting Started with Behavioral Neuroscience: Standardizing Experiments and Using Viral Vectors

    Type
    Blog Post
    Published
    Aug. 20, 2019, 12:31 p.m.
    ...Learn about Addgene's viral service Find viral protocols and videos Find AAVs for your research ...historical ties to psychology and philosophy (the mind-body problem). Because of the availability of tools...between animals as olfactory stimuli that were left behind from a preceding animal (ex: urine) can be distracting...Animal Strain, age, sex, housing conditions (individually versus in groups), health status, diet, cage...differences in behavior observation); experimenter blinding to avoid bias Genetic manipulation in behavioral... neuronal targeting after stereotaxic injection. Find more details about choosing AAV or lentiviral vectors...about two weeks before the behavior test. This time window between injection and testing will vary depending...
  7. Open Resources and Plasmid Tools For Studying C. elegans

    Type
    Blog Post
    Published
    July 18, 2019, 12:55 p.m.
    ... International C. elegans meeting, I was again reminded of the extent that C. elegans researchers embrace...worm community where one can publish brief novel findings. These results are normally one figure and can...This a great resource for scientists to publish findings that don't fit into larger publications and would...embryo when all essential embryonic genes are individually depleted via RNA interference (RNAi). Scientists...tools for the community. Plasmids for the Auxin Inducible Degradation System (AID) The Dernberg lab in 2015...controls the expression of a GAL-4 driver that can bind to activation sequences upstream of genes to stimulate...expanded on this tool by splitting cGAL4 in two and binding each half to a gp41-1-N-intein. Split inteins are...
  8. High Complexity Golden Gate Assembly with NEB’s DAD

    Type
    Blog Post
    Published
    Aug. 1, 2023, 1:15 p.m.
    ...don’t use the same overhang twice; (2) avoid palindromes; (3) no overhangs with the same three nucleotides...Fidelity, it turns out, might depend more on the individual sequence(s) than on how well that sequence fits...Pryor et al., 2020), and randomly selected non-palindromic pairs allows for high-fidelity assembly for up...potential for mismatches, so you can redesign individual pieces as needed to improve fidelity. NEBridge...tool for you. Once you input a sequence, SplitSet finds optimal fusion sites to split it into multiple fragments...define the number of fragments, and the “search windows” you’d like the tool to use to identify fusion ... return the highest-fidelity overhang set it can find for those parameters. For even more specificity,...
  9. Tips for a 1st Time CRISPR User (by a 1st Time CRISPR User)

    Type
    Blog Post
    Published
    March 7, 2017, 3:30 p.m.
    ...maintenance involved. Also it was really fun to find individual colonies growing out in the 96-well dish. My...transduced with Cas9 expressing lentivirus at the indicated multiplicity of infection (MOI). Anti-vinculin... the initial stable cell pool (pool) and from individual cell expansions (monoclonal, 1-5). Wild-type ...control GFP gRNA (BRDN0000561167) (80034-LV) were individually used to transduced stable pools of Cas9-A549...about (which could affect the ability of the gRNA to bind). Verifying genomic edits with the surveyor assay...the 428 bp Surveyor nuclease cleavage product indicates a gene edit. GFP gRNA-transduced Cas9-A549 cells... by gel electrophoresis, these mismatches are indicated by the presence of DNA cleavage products. The ...
  10. Hot Plasmids: Summer 2025

    Type
    Blog Post
    Published
    Aug. 28, 2025, 1:15 p.m.
    ...through our Hot Plasmids articles. Here's what you'll find in this post: Bright and photostable yellow fluorescent...fluorescent proteins tend to photobleach rapidly, which hinders their use for long-term imaging or advanced techniques...for your next experiments and see the difference! Find mGold2 plasmids here! Lee, J., Lai, S., et al. ... species, thanks to the broad host range of TRV. Find TRV-TnpB plasmids here! Weiss, T., et al. (2025...non-genetic diversity in human cancer stem cells. Find the LARRYv2 Libraries here! Singh, I., Fernandez-Perez...to order viral vectors ready to use in your lab. Find Addgene’s AAV6 and AAV11 packaging plasmids here...on an antibody-like protein AMPA.FingR (AF) that binds to AMPA receptor subunit GluA1 found at excitatory...
  11. Transferable Skills Guide: Managing a Team

    Type
    Blog Post
    Published
    Jan. 30, 2018, 2:42 p.m.
    ... all”. Manage the individuals in your team: learn what motivates them (keep in mind that it can be very...it will take time so be patient and keep an open mind. First let’s clear up a misconception about being...have reports with different levels of experience), find out what their learning styles are and capitalize...benefit of the team. By properly managing the individuals in your team you will have a much better chance...(needs to) feel valued. Talk to your manager and find a mentor Your manager should support you, just like... how to face a particular situation. But keep in mind that a good manager should help you work through...you and you need to encourage them to speak their minds. They will make mistakes and you will take responsibility...
  12. PITChing MMEJ as an Alternative Route for Gene Editing

    Type
    Blog Post
    Published
    Feb. 23, 2016, 3:30 p.m.
    ...in the genomic locus. The first two breaks are induced via a generic PITCh-gRNA; the third break by an...flanked by 5' and 3' microhomology and PITCh-gRNA binding sites. This PITCh plasmic is cotransfected with...optimized the PITCh-gRNA for minimal off-target binding in mammalian genomes as assessed by CRISPR design... and 3’ junctions, respectively. These results indicate that PITCh is a robust method for genomic insertion...staggered pattern, it is thought to be ideal for HDR-independent knock-ins, but this possibility is still being...systems.” Nat Protoc. 11(1): 118-33. PMID: 26678082. Find the plasmids from this publication at Addgene. ... Cells.” Cell Rep. 13: 621-633. PMID: 26456817. Find plasmids from this publication at Addgene. 3. Zhang...
  13. New Optimized Genome-wide CRISPRko, CRISPRi, and CRISPRa Libraries

    Type
    Blog Post
    Published
    Oct. 4, 2018, 12:44 p.m.
    ...Addgene.org Find CRISPR plasmids and resources here Find pooled libraries available at Addgene Find CRISPRko...mutations result in an inactive RNA-guided DNA binding protein (dCas9). dCas9 is then tethered to a repressive... and Doench lab selected sgRNAs in this optimal window and ranked them based on their optimized sgRNA ...Brunello knock-out library while mitigating toxicity induced by high copy number dsDNA cutting. A Dolcetto library...transcriptional machinery to dCas9 and its RNA directed binding site. These methods include the fusion of an activation...overlapping genes, most genes were unique to the individual libraries. These unique hits may have been false...can be used in complement to study gene function. Find the Calabrese pooled library and lentiviral prep...
  14. AAVs CREATed for Gene Delivery to the CNS and PNS

    Type
    Blog Post
    Published
    Sept. 28, 2017, 2:01 p.m.
    ...the tTA inducer virus, but the desired sparsity of labeling is achieved with lose doses of inducer virus...Gradinaru Lab at Caltech stepped up to the challenge. Find the PHP Plasmids Here! Their Solution: Use the ...viral cocktail are injected, by chance lots of individual cells will be transduced with multiple viral ...notice in figure 4b how difficult it is to trace individual cell’s axons, particularly the two green neurons...expressing RGB proteins under the control of an inducer, i.e. tet-off transactivator (tTA), is injected...that are labeled. Part 2: An AAV expressing the inducer (i.e. tet-off transactivator) is co-injected. The...tag-then-express system that allows for controlled induction of multi-color labeling of neurons (figure 4)....
  15. DNA Purification Without a Kit

    Type
    Blog Post
    Published
    Feb. 11, 2020, 2:15 p.m.
    ... of binding DNA to silica columns, it’s bound to glass syringe filters. Normally DNA does not bind silica...silica are commonly used to bind and purify DNA, cellulose also efficiently binds, or at least entraps nucleic... can be stacked together in series to increase binding capacity. Figure 1: Purify DNA using glass... and 2) it helps DNA stick to the glass. After binding DNA, the glass particles are pelleted by centrifugation...mixture to absorb the nucleic acids. Containinants bind cellulose less tightly than nucleic acids, so placing... Addgene blog Read our Plasmids 101 blog series Find other plasmid protocols and tips Browse our plasmid...plasmid cloning blog posts Resources on Addgene.org Find protocols for molecular biology and cloning Read...
  16. Editor's Choice, September 2016

    Type
    Blog Post
    Published
    Oct. 7, 2016, 4 p.m.
    ...describes a technique you can use to find phage proteins that bind to your bacterium of interest. For those...contributed the most to this record breaking month and to find other posts that deserve a second look. 5 Great ...colleagues. Technique: Probe Phage Genomes for Host Binding Proteins & Running for Rare Disease, Running for...first, "Technique: Probe Phage Genomes for Host Binding Proteins," was contributed by guest blogger Jessica...dress up as Mr. Incredible, an added bonus. You can find the rest of our September posts in chronological...CRISPR Kinome Libraries Available: Pooled and Individual Plasmid Formats Better Dyeing Through Chemistry... a Lab and a Project That’s it for now. As I indicated in the opening paragraph, I’m currently on my ...
  17. Our Most Popular Blog Posts from 2019

    Type
    Blog Post
    Published
    Dec. 31, 2019, 2:26 p.m.
    ...Blog Read other Addgene news Find the most recent plasmid blog posts Find the most recent CRISPR blog ...Anti-CRISPR, 2in1 Cloning, Fluorescent Voltage Indicators, and Photoswitchable Proteins by Cary Valley,... Jennifer Tsang There are many strategies for finding your clones in an experiment. Read this blog post... Learn about mNeonGreen, mTFP1, and mWasabi and find plasmids containing these fluorescent proteins at...are nucleic acid sequences that fluoresce upon binding a small molecule, are often named after vegetables...Tools for Making Scientific Graphics by Beth Kenkel Find a round-up of tools you can use for making scientific...posts Resources at Addgene Browse the repository Find educational resources at Addgene Search for plasmids...
  18. "Hall of Fame" AAV Enhancers from the Allen Institute for Brain Science

    Type
    Blog Post
    Published
    Sept. 9, 2025, 1:15 p.m.
    ...believe in the power of partnerships with like-minded individuals and organizations, like the Allen Institute...chromatin modifiers. These proteins recognize and bind motifs within the enhancer sequence, then interact...expression of transcription factors, which recognize and bind to different DNA motifs, results in a given DNA ...differential DNA accessibility,” and AIBS uses it to find potential enhancer candidates. To use these sequences...of labeling in each. This allows users to quickly find the tools that best fit their specific experimental...the highest specificity and brightness. You will find enhancers to target many different cell populations...resources. Luckily for us, they like sharing! You can find data, analysis tools, and other scientific and educational...
  19. Neuronal labeling with Spaghetti Monster

    Type
    Blog Post
    Published
    Aug. 14, 2018, 12:42 p.m.
    ...on Addgene.org Find the Spaghetti Monster probes at Addgene Browse all AAV vectors Find ready-to-use AAV...brain. This atlas enables researchers to quickly find the best AAV serotypes to target the neurons they...synthetic peptide FLAG, the synthetic streptavidin-binding strep-tag and, more recently, OLLAS (Escherichia...composed of FPs fused to multiple epitope tags. Indeed, to create the smFPs Looger’s team strategically...a physics graduate from Oregon State University. Find the Spaghetti Monster probes at Addgene Uses of ...structures through their multiple, high-affinity binding sites for primary antibodies which can be used ...Through their multiple, highly specific antibody binding sites and primary antibody-based detection, smFPs...
  20. An Inside Look into Addgene's Dev Team

    Type
    Blog Post
    Published
    Jan. 23, 2020, 2:45 p.m.
    ...have the same blind spots, and there wouldn’t be anyone to question these blind spots. Blind spots often...development is not one of the things that comes to mind. The truth is, there is a lot of software development...result of our diversity which in turn minimizes the blind spots in our work.  Agile at Addgene We follow an...short periods of time called sprints. The team is mindful of the number of stories we commit to for each ...reviews because it’s like a little peek into the mind of the developer and I get to see an approach that... this happens, we need to research and hopefully find a comparable library if it’s gone stale or we will...Learn about what went into our search engine update Find all Addgene news Resources on Addgene.org Check...
  21. Career Insights: Technical Support Specialist

    Type
    Blog Post
    Published
    Nov. 9, 2017, 2 p.m.
    ...hoping to follow the traditional academic route (find tips for getting a faculty position here). Possible...comprehensive lab experience. With this valuable training behind you (and largely only that is necessary), there...problems, a general positive attitude, and an open-minded personality. These traits will help you deal with... a customer’s concerns and are patient enough to find the real issue, you will do well in a technical ...troubleshooting or issuing replacement products. In order to find good and helpful answers for customers, internal...are often found in sales or lab-based roles in industry. What to look forward to in a technical support...fascinating and exciting to listen to the many individual stories and get (sometimes refreshing) insights...
  22. New Acoustic Reporter Genes: Ultrasound Imaging of Gene Expression

    Type
    Blog Post
    Published
    Jan. 24, 2023, 2:15 p.m.
    ...bARGSer with several inducible expression systems in E. coli. The arabinose-inducible promoter pBAD and ...replication (p15A) worked best under a wide range of inducer concentrations (0.1-1% L-arabinose) without signs... or at lower temperatures for longer. Cultures induced with arabinose and colonies on arabinose-containing...expression, from left to right: colony whiteness on inducer plates, white inclusions in cells with GVs via ...integratable cassettes, both with doxycycline inducible promoters (Fig. 2a). The first cassette contains... phase contrast microscopy just one day after induction of expression… but longer expression leads to ...plasmids (Fig. 2b). Next, perform a short (12-hour) induction with doxycycline prior to FACS, gating for the...
  23. CRISPR 101: Which Cas9 Do I Choose for My CRISPR Experiment?

    Type
    Blog Post
    Published
    Oct. 13, 2022, 1:45 p.m.
    ...within the editing window (bases 4-8 of the protospacer). While this is a small window, this system can ... website Find CRISPR Plasmids Catch up on your CRISPR background with our CRISPR Guide Find Software ...through Addgene’s repository) and make it easy to find your perfect match. Choosing a Cas9 for your knockout... anywhere to be found. If you’re lucky enough to find a SpCas9 compatible PAM at your site of interest...performed on all relevant bases within the editing window, for example all C’s will edit to T’s. Thus, it... capable of interacting with an additional RNA-binding transcriptional activator. Plasmids for activating...the many freely available sgRNA design programs. Find Validated gRNAs for Your Next CRISPR Experiment ...
  24. Binning Singletons: Tackling Conference Networking When You Don’t Know Anyone

    Type
    Blog Post
    Published
    Feb. 18, 2020, 2:15 p.m.
    ...post-meeting survey indicated that the program was largely a success, but also helped us find areas for improvement...really fit in anywhere and everyone who was doing the kind of work my lab wanted to do already seemed to know...Singletons came together. The term Singleton was on my mind because we’d had discussions in my lab about whether...Image: James et al., 2020. Help me stranger - Finding mentors for the meeting Just like analysis pipelines...genes that can improve chances of survival for an individual, and eventually, a community. The experiences...and vastly expand their networks as they naturally find people with which they have interests and experiences...experiences in common. We often refer to this as “finding your people.”    Had a fun time at the #BinningSingletons...
  25. Avoiding the Dark Side of Fluorescent Protein Fusions with mOX FPs

    Type
    Blog Post
    Published
    Oct. 27, 2015, 3 p.m.
    ...contributed by guest bloggers Erik L. Snapp and Lindsey M. Costantini. "You underestimate the power of ...thanks to our guest bloggers Erik L. Snapp and Lindsey M. Costantini! Erik Lee Snapp received his PhD ... long distance runner, gardner, and cook.      Lindsey M. Costantini received her PhD in Biomedical Research...Pubmed Central PMCID: PMC557822. 4. Costantini, Lindsey M., and Erik Lee Snapp. "Fluorescent proteins in...Pubmed Central PMCID: PMC3806368. 5. Costantini, Lindsey M., et al. "A palette of fluorescent proteins optimized...Central PMCID: PMC1222268. 7. Aronson, Deborah E., Lindsey M. Costantini, and Erik L. Snapp. "Superfolder ...Pubmed Central PMCID: PMC3359384. 9. Costantini, Lindsey M., et al. "Cysteineless non-glycosylated monomeric...
  26. 10 Ways to Share Your Science!

    Type
    Blog Post
    Published
    May 13, 2014, 8:34 p.m.
    ...help when it comes to finding a job. Many people in science will work in industry or take on collaborative... way to follow news about particular subjects or find out what others are reading. Check out science blogs...tell your friends or others in the field where to find it. A good way to reach others in the science blogosphere... 5)   Local science museums are a great place to find opportunities for science outreach. Here in the ...student I know who participated was surprised to find that his friends and family finally understood why...office is a good place to start. It’s not unusual to find science writers who started out as graduate students...they’d be willing to meet for lunch or coffee and find out how they got where they are. 8)   Look into ...
  27. Students Invented a New Diagnostic for Lyme Disease — and a Tool for CRISPR Researchers

    Type
    Blog Post
    Published
    May 12, 2026, 1:15 p.m.
    ...J. A. (2018). CRISPR-Cas12a target binding unleashes indiscriminate single-stranded DNase activity. Science...cited our primer design protocol — then blew our minds with their project, called LANCET, in which they...bound to the amplified target sequence, Cas12a indiscriminately cleaves ssDNA reporters, freeing fluorophores...approach to other diseases? Yes, the wet lab pipeline behind LANCET is designed to be a modular system… The ...Lyme and could detect essentially anything you can find in blood. How did you start learning about CRISPR... exactly where we expected it. Aptamer protein binding is sensitive to multiple variables like buffer,...depends on pollination, we think it's exactly the kind of real world problem iGEM is built for. More updates...
  28. CRISPR 101: Homology Directed Repair

    Type
    Blog Post
    Published
    Jan. 26, 2023, 2:15 p.m.
    ...Repair (HDR). NHEJ is the canonical homology-independent pathway as it involves the direct ligation of...synthesis-dependent strand-annealing (SDSA), and break-induced repair (BIR). The non-conservative method is single... synthesizes DNA from the second DSB end. The individual HJs are resolved via cleavage in one of two ways...to fill the gap, thus completing SDSA.   Break-induced repair (BIR) pathway BIR is characterized by the...pathway may not be immediately applicable in DSB-induced genome engineering, it has biological importance...as 30-50 bases for each homology arm, but keep in mind these numbers may vary based on your locus of interest...double-strand break repair and their potential to induce chromosomal aberrations. Pfeiffer P, et al. Mutagenesis...
  29. Quick Guide to Near-Infrared Fluorescent Proteins

    Type
    Blog Post
    Published
    Oct. 5, 2021, 1:15 p.m.
    ...calcium indicator (Shemetov et al., 2021). In addition to FRET, intensiometric calcium indicators NIR-GECOs...researchers choose the probe for their needs. You’ll find basic information on NIR FPs, their properties and...of state-of-the-art probes, many of which you can find at Addgene. Biliverdin chromophore Near-infrared...listed in Table 1) were optimized for efficient binding of endogenous BV.  When imaging NIR FPs, consider...performance, and applications of near-infrared calcium indicators in this recent review (Shcherbakova et al., 2021...encoded near-infrared fluorescent calcium ion indicator. Nat Methods 16, 171-174 (2019). Matlashov, M..... A near-infrared genetically encoded calcium indicator for in vivo imaging. Nat Biotechnol 39, 368-377...
  30. Summer SciComm Series: Master of SciComm

    Type
    Blog Post
    Published
    July 21, 2022, 1:15 p.m.
    ...entails. Despite being engrossed by the theory and findings of brain science, my curiosity did not ultimately...communication. The first year of the course involved a whirlwind of skill acquisition. Classes covered filmmaking... would have a high level of career satisfaction indeed.   For many venturing forth from tertiary study...discernible paths. The first leads into the world of industry. Along this road, science communication graduates...Moreover, this subject allowed me to engage in findings relevant to my background (neuroimaging, biomechanics... a survey instrument designed to measure how individuals respond to issues of unsettled science. Understanding...building, each day brushing past and chatting with individuals whose research ranged from wildlife conservation...
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