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We narrowed to 522 results for: des.2

Showing: 141 - 160 of 522 results

  1. Troubleshooting Your Plasmid Cloning Experiment

    Type
    Blog Post
    Published
    Sept. 24, 2019, 12:55 p.m.
    ...correct. It's also best to use 1-2 ug of the vector for digestion. PCR Design primers that overlap at least...plasmid; a starting point could be a molar ratio of 1:2 (plasmid:insert), but this parameter has to be optimized...colonies (5-10) and grow them in a small culture volume (2 or 3 ml) containing the corresponding antibiotic, ...coveted plasmid with no substantial delays. Design, design, design Before diving into the experimental work...experimental work. Fragments generation After you’ve designed your cloning scheme, you’re now ready to generate...from a large genome, you can recheck your primer design or optimize your primers or PCR conditions. Purifying...second and more detailed look at your experimental design. Full lawn of cells. The antibiotic in your plate...

  2. CRISPR 101: Cytosine Transversion Editors

    Type
    Blog Post
    Published
    March 25, 2025, 1:15 p.m.
    ...Nature Cell Biology, 26(2), 294–304. https://doi.org/10.1038/s41556-023-01342-2 Koblan, L. W., Arbab, M...order to bind DNA, Cas9 requires (1) a guide RNA, (2) a complementary DNA sequence, and (3) a protospacer-adjacent...region of separate strands called an R-loop (Figure 2). This allows the guide RNA to base pair with the ...accessible on the outside of the enzyme. Figure 2: CRISPR R-loop. Created with BioRender.com. Base...), 35–40. https://doi.org/10.1038/s41587-020-0592-2 Additional Resources on the Addgene blog CRISPR 101...in the development of CBEs and ABEs. This post includes a lot of acronyms, so we’ve included a glossary... in different cell types, available at www.crisprbehive.design. CGBEs fused to pioneer factors to improve...

  3. Fluorescent CRISPR Reporters: SRIRACCHA and GEmCherry2

    Type
    Blog Post
    Published
    May 26, 2020, 1:15 p.m.
    ...lab found that H2B-GFP expressing cells exhibited a 2-4 fold increase in the number of endogenous indel ...Denham lab made several other small changes creating 2 other versions but these did not surpass GEmCherry2...fluorescence and in-frame fluorescence.  Figure 2: The GEmCherry reporter. Image from Højland Knudsen...created SRIRACCHA in 2017 to enrich and identify desired CRISPR mutants (Wen et al., 2018). SRIRACCHA uses...constructs for the reporter to work and to make the desired genome edit:  A donor plasmid that contains a ...OH-T and doxycycline. A gRNA that targets your desired gene (whose sequence is also found in the reporter...well. The ratio of RFP to GFP expressing cells provides a real-time read out of Cas9 activity.  By using...

  4. A Practical Guide to Optimizing AAV DIO and FLEx Vector Expression

    Type
    Blog Post
    Published
    Nov. 2, 2021, 1:15 p.m.
    ...one of lox2272 sites will now be sandwiched between 2 loxp sites and is excised by Cre (Figure 1). This ...flank the transgenes (non-homologous pairs) (Figure 2.). They found that almost all off-target expression...exercise caution when using them.    Figure 2. Schematic diagram showing the mechanism of spontaneous... Tropism and Axonal Transport of AAV Serotypes 1, 2, 5, 6, 8 and 9 in the Mouse Brain. PLoS ONE 8:e76310... Pseudotyped with Viral Capsids from Serotypes 1, 2, and 5 Display Differential Efficiency and Cell Tropism...experiments to minimize it. Overview of DIO/FLEx vector design Recombinase-dependent vectors utilize pairs of ...between them. Early recombinase-dependent vector designs used a lox-STOP-lox (LSL) or frt-STOP-frt (FSF)...

  5. Important Considerations in Optogenetics Behavioral Experiments

    Type
    Blog Post
    Published
    Oct. 1, 2015, 2:30 p.m.
    ... will repeatedly nose-poke at the active hole [1, 2].    Place preference/place aversion also models reinforcement...spend most of its times in the opposite chamber) [2]. Laser activation is usually controlled automatically...two different ways 1) your hypothesis is wrong or 2) there is some problem with the technical implementation...PMID: 21716290. Pubmed Central PMCID: PMC3775282. 2. McDevitt, Ross A., et al. "Serotonergic versus nonserotonergic...other words, your optogenetic experiment should be designed around a behavioral test in which your circuit...of mouse transgenics. Everything that has been described is intended for the mouse; however, all the steps....Diester, Ilka, et al. "An optogenetic toolbox designed for primates." Nature neuroscience 14.3 (2011)...

  6. Fluorescent Proteins 101: Luciferases

    Type
    Blog Post
    Published
    July 22, 2025, 1:15 p.m.
    ...abdomen to produce yellow-green light (Figure 2). Despite the title of this post, this reaction is not ...; no chemical reaction takes place. Figure 2: Simplified chemical reaction catalyzed by luciferase... has a detailed list of luciferase options. Table 2: Properties of luciferase enzymes Name Natural ...not fluorescence! Chemiluminescence, which includes all bioluminescence, is the production of light by a...assays (low background, no photobleaching) but provides flexibility by pairing the luciferase with a variety...luciferase output at different wavelengths. Addgene provides empty backbones with the luciferase gene, a variety...

  7. Quick Guide to Working with Drosophila Part 3: Genome Engineering in Flies

    Type
    Blog Post
    Published
    July 28, 2017, 1:30 p.m.
    ...are many docking sites available for integration. 2. How soon would you like your flies ready for use?...beautiful immunofluorescent images like in this paper (2). Metabolic assays such as Seahorse can be employed...PMID: 16547094. PubMed Central PMCID: PMC1526508. 2. H. Jiang,  et al. Cytokine/Jak/Stat signaling mediates...Harvard University. In my previous two posts, I’ve described the fundamentals of how to work with Drosophila...Drosophila as an experimental model organism. I then described the Gal4/UAS system used by geneticists to study....e. there won’t be positioning effects). When designing experiments where you want to express multiple...wondering, “How do I know which of my flies have the desired integration?” Not to worry! In flies, phenotypic...

  8. The time and cost required to make a plasmid

    Type
    Blog Post
    Published
    March 23, 2023, 1:15 p.m.
    ...required to make a plasmid. In 2023 (and at closer to 2 million plasmids shared than not!), we think it’s ...time does it take to make a plasmid? Figure 2: Survey results from a Twitter poll run in 2023, n...go wrong, replace them for free. Plasmids ship out 2-3 days after ordering, making it a toss-up as to whether...in science – the time spent by the scientists designing and performing the experiments. This cost varies...quickly with the postdoc who’s really good at primer design – but first, you have to know what resources exist...well) plate! How much do repositories help?   Designing precise calculations for any of the numbers in...engagement with and use of repositories like Addgene provides large-scale savings. How large? Using Doench’s...

  9. Antibodies 101: Flow Cytometry

    Type
    Blog Post
    Published
    July 20, 2021, 1:15 p.m.
    ...termed fluorescence activated cell sorting or FACS (2). By analyzing single cells instead of the population...expression. A routine flow cytometry experiment uses 2 or 3 different fluorescent colors each measuring a...distinct populations on a FSC versus SSC plot (Figure 2).  A user can then “gate” around the specific population...cell and T cell into distinct populations (Figure 2). An immunologist who studies B cells, might then ... B cells, plasma cells or others.   Figure 2: Due to differences in their size and complexity, ...assessed for the desired parameter. A droplet containing a cell that is positive for a desired parameter is...their observations. However, while flow cytometry provides analysis at the cellular level, it cannot be used...

  10. Pairing CombiGEM and CRISPR for Combinatorial Genetic Screening

    Type
    Blog Post
    Published
    April 12, 2016, 2:30 p.m.
    ...Central PMCID: PMC4151723. 2. Doench, John G., et al. "Optimized sgRNA design to maximize activity and ...CombiGEM lentiviral vector backbone pAWp12 (Figure 2). Cloning from the pAWp28 storage vector to the pAWp12... before beginning your experiments. Figure 2: Strategy for assembling barcoded combinatorial gRNA... Blog Learn Best Practices for Designing Your gRNA Read How Barcodes Can Be Used in Lineage Tracing Read...genetic perturbations. The ease with which one can design and synthesize CRISPR guide RNAs (gRNAs) for genome...their functions. The continual advancements in gRNA design necessary to achieve maximal on-target and minimal...regulation in biological systems. The CombiGEM platform provides a means to create barcoded gRNA libraries that...

  11. 5 Steps to Writing Grant Proposals for Grad Students

    Type
    Blog Post
    Published
    Feb. 11, 2014, 12:13 p.m.
    ...Step 2: Develop a research plan Most grant applications restrict the space available to describe the ...require application submission in-house approximately 2 weeks before the RFA due date in order for the administrative...proposal typically lists the deliverables, explains 1-2 potential pitfalls of the intended protocol, and offers...application. It typically includes overview information, key dates, funding description, research plan, award... setbacks, and potential alternative routes, Provides opportunities to convince others why a project...aspects are understood. While reading the funding description, pay attention to the keywords used and think...literature and offer educated insight into what the desirable features of future technologies should offer in...

  12. Plasmids 101: CcdB - The Toxic Key to Efficient Cloning

    Type
    Blog Post
    Published
    Dec. 8, 2016, 3:30 p.m.
    ...CcdB.” Biotechniques. 1996 Aug;21(2):320-3. PubMed PMID: 8862819. 2. Bahassi, EM., et al. “F plasmid CcdB...those that do not contain the desired insert should not grow.   Figure 2: Image from http://teachline.ls.huji.ac.il... plasmid maintenance during cell division. ccdB codes for the toxic protein (CcdB) that acts as a DNA ...death. ccdA, another gene found in the ccd operon, codes for the antitoxin protein (CcdA) that protects the...of ccdB, leading to positive identification of desired clones.   ...Becomes a powerful cloning tool...

  13. Enhancing CRISPR Targeting Specificity with eSpCas9, SpCas9-HF1, & HypaCas9

    Type
    Blog Post
    Published
    Dec. 16, 2015, 3:30 p.m.
    ... (2,3). Stable strand separation is maintained by 2 sets of interactions : 1. Interactions between the...formed by the Cas9 HNH and RuvC nuclease domains 2. Interactions between the target strand and the gRNA... Find plasmids from this publication at Addgene. 2. Nishimasu, Hiroshi, et al. "Crystal structure of ... nuclease activity of the Cas9 nuclease itself. Design and testing of eSpCas9 Looking at the structure...and the negatively charged DNA and therefore destabilize basal strand separation. This decreased strand... choice and get improved on-target specificity. Design and testing of SpCas9-HF1 Kleinstiver et al and...Joining Repairs Double Strand Breaks Get Tips on Designing Your gRNA Browse Our CRISPR 101 Series Resources...

  14. CRISPR-Cas14: a family of small DNA-targeting enzymes enabling high-fidelity SNP genotyping

    Type
    Blog Post
    Published
    Nov. 29, 2018, 1:53 p.m.
    ...of other Cas proteins found in the so-called class 2 CRISPR-Cas systems. There are 24 variants of the cas14...the presence of infectious organisms (ex: SARS-CoV-2) and genetic mutations. By providing a gRNA specific... cas1, cas2, cas4, and a new gene cas14. cas14 encodes for a small Cas protein (40-70 kDa), which is half...Harrington, Lucas B., et al. "Programmed DNA destruction by miniature CRISPR-Cas14 enzymes." Science 362.6416...

  15. Using Phosphoserine to Study Protein Phosphorylation

    Type
    Blog Post
    Published
    June 23, 2016, 2:30 p.m.
    ...phosphorylation events in the proteomes of higher mammals (2). How can we begin to understand the importance of... the open reading frame (ORF) of interest (Figure 2). 1. The phosphoserine OTS The backbone of the phosphoserine...optimized Sep-OTSλ and can recommend its use (6).  2. C321, a specialized bacterial host strain for pSer-incorporation...biology4.5 (2002): E127-E130. PubMed PMID: 11988757. 2. Hornbeck, Peter V., et al. "PhosphoSitePlus, 2014...site-specific incorporation of phosphoserine (as described below) provides researchers with a valuable tool for understanding...organisms lacked a classic cysteinyl tRNA synthetase, despite abundant incorporation of cysteine in their proteomes...pSer-incorporated proteins on a single plasmid. This includes 4 copies of a tRNA that specifically recognizes...

  16. Evolution of Brainbow: Using Cre-lox for Multicolor Labeling of Neurons

    Type
    Blog Post
    Published
    April 24, 2015, 2:39 p.m.
    ...preventing design of antibodies specific to each fluorophore. Third, Brainbow-1 and Brainbow-2 each contained...Brainbow mouse neural labeling system. Brainbow-1 and -2 have been further refined to create Brainbow 3.2. ...M-CFP expression; these deletions are defined using 2 loxP variants (only identical loxP sites can mediate...processes not previously visible with Brainbow-1 and -2. The general structure of Brainbow-1.0 is retained...R26R-Confetti described in Hugo J. Snippert, et al. (2010) and the MAGIC Marker strategy described in Karine...Brainbow-1 system employs Cre-mediated deletion, the design of Brainbow-2.1 cleverly combines Cre-mediated ...immediately following the promoter. The STOP cassette includes a mutant YFP that does not fluoresce, but can ...

  17. Hot Plasmids April 2018 - Protein Degradation, Nanoscopy, FIRE-Cas9, and Yeast Expression Tools

    Type
    Blog Post
    Published
    April 23, 2018, 2 p.m.
    ...difficult-to-manipulate primary cells, achieving knockdown within 1-2 hr of reagent delivery. TRIM-Away is suitable for ...factor 1 controls expression of transcription factor 2, which directly controls expression of a reporter ...modulating the induction of transcription factors 1 and 2. See Aranda-Díaz et al. for more information. The ...TRIM21 recruits ubiquitin and the proteasome to destroy antibody-bound pathogens. Clift et al. found that...necessary for studying endosomes, the Hell lab designed their super-resolution pH indicators (SRpHi) biosensors...sgRNAs are used with FIRE-Cas9, experiments can be designed to target multiple loci at once. In addition, ...

  18. The Future of Research Symposium Boston 2015

    Type
    Blog Post
    Published
    Oct. 20, 2015, 2:30 p.m.
    ...Quotes taken directly from participants (summarized in 2) touched upon many problems in this area: “ [The] ...PMID: 24733905. Pubmed Central PMCID: PMC4000813. 2. McDowell, Gary S., et al. "Shaping the Future of ...A fair deal for PhD students and postdocs." Elife 2 (2013): e01139. Pubmed PMID: 24137543. Pubmed Central...growing dialogue on the state of a system that, despite all of its successes, has many deep-rooted flaws...all bad, however - there are some signs that the tides may be turning. In 2013, the NIH announced its first...in Scientific Training (BEST) awards, which are designed to support new approaches that address the need...

  19. Viral Vectors 101: Calcium Sensors

    Type
    Blog Post
    Published
    Aug. 10, 2023, 1 p.m.
    ...calcium biosensor, so that the (1) binding of calcium, (2) allosteric rearrangements of the sensor, and (3) ...user-controlled illumination with violet light and (2) exposure to increased intracellular calcium. It has...dynamics in vivo. Neuroscience Research. 2021 Aug 1;169:2-8. Suzuki J, Kanemaru K, Iino M. Genetically encoded... There are several calcium reporters specially designed for the aims and requirements of in vivo studies...populations of interest. Many of the calcium sensors described are also already packaged into viral vectors and... L, Campbell RE. Structure-and mechanism-guided design of single fluorescent protein-based biosensors....

  20. Advanced Uses of Cre-lox and Flp-FRT - A Neuroscientist’s View

    Type
    Blog Post
    Published
    Oct. 19, 2017, 1:54 p.m.
    ...FLP and Cre for additional control   Figure 2: Expression of a morphological marker (eYFP) and synaptic...Sternson. 2008. “A FLEX Switch Targets Channelrhodopsin-2 to Multiple Cell Types for Imaging and Long-Range ...PMID: 18614669. PubMed Central PMCID: PMC2593125. 2. Buchholz, F, P O Angrand, and A. Francis Stewart....The FLP Recombinase of the Saccharomyces Cerevisiae 2 Micron Plasmid Attaches Covalently to DNA via a Phosphotyrosyl... this re-inversion issue. It became possible to design FLEx vectors (Flip-excision vectors) that only ...
Showing: 141 - 160 of 522 results