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We narrowed to 841 results for: STI

Showing: 301 - 320 of 841 results

  1. Tips for Titering Your Lentiviral Preps

    Type
    Blog Post
    Published
    March 15, 2016, 2:30 p.m.
    ...a risk that they may underestimate viral titer as these assays cannot distinguish between a cell that ... based off of p24 quantification tend to be overestimates since they can include free p24 and defective...assay, titering via measurement of viral RNA can overestimate the amount of infectious virus in a prep as ...integration events, reducing the possibility of underestimating the viral titer. The main drawback of this ...

  2. Viral Vectors 101: Systemic Capsids

    Type
    Blog Post
    Published
    Oct. 12, 2023, 1:15 p.m.
    ...engineered precursor of the systemic capsid in question (or both). Therefore, a high-efficiency systemic...These are only starting recommendations; you will still need to experimentally determine the best titer ...your experiment, it’s time to start selecting and testing systemic capsids! Figure 2 contains a decision ...reduced efficiency, and is not neutralized by pre-existing antibodies against AAV9-based vectors (and vice...AAV-PHP.S, with a bias toward segments of the small intestine (Chen et al., 2022). Systemic capsid for alveolar...Cre-dependent selection yields systemic AAVs for targeting distinct brain cell types. Nature Methods, 17(5), 541–550...

  3. Pooled Library Amplifications

    Type
    Blog Post
    Published
    May 30, 2024, 1:30 p.m.
    ...protocol for your pooled library deposit. When a requesting scientist receives a pooled library from Addgene...colonies, you’ll likely rely on serial dilutions to estimate transformation efficiency (Figure 2).    ... Figure 2: Example of a serial dilution to estimate transformation efficiency. Figure used with permission...protocol paper by the Zhang lab, and the Broad Institute’s general pDNA Library Amplification protocol are...depositing it with Addgene. If you have any specific questions about designing your library amplification protocol...

  4. Golden Gate Assembly Upgrades: More Fragments, Faster Assembly, and Higher Fidelity

    Type
    Blog Post
    Published
    Oct. 11, 2018, 12:30 p.m.
    ...in 5’ four base overhangs after cutting. The destination vector receives the assembly after similar Type...re-digested and "eligible” for ligation into the destination construct. Reactions are often cycled between...acquisition of antibiotic selectable markers by the destination plasmid. Antibiotic selection allowed for high...very occasional uncut or cut/re-ligated pGGA destination plasmids. A final validation of the 5-, 12- or...is dependent on the presence of every module, destination construct and functioning Type IIS restriction...

  5. Transferable Skills Guide: Managing a Team

    Type
    Blog Post
    Published
    Jan. 30, 2018, 2:42 p.m.
    ...discuss the work, set expectations, answer any questions, and (most importantly) decide on a timeline. ...regularly, make yourself available, and encourage questions. Unless you’re delegating a recurring task to ...to a seasoned report, there should be questions! Remember that delegating is not just a way to create more...team members by giving them new opportunities. I still need to check myself sometimes to make sure I am...major problem. But I also learned to ask specific questions. “How’s everything going?” is likely to get you...

  6. AAV Vector Quality Control: Going the Extra Mile with NGS

    Type
    Blog Post
    Published
    Sept. 12, 2017, 1:44 p.m.
    ...the prep during the production process? These questions are especially important when producing multiple...we have analyzed hundreds of viral vectors and estimate that recombinase-independent recombination occurs...below to let us know if you have any specific questions about viral DNA NGS you’d like us to discuss. ...by phone or at [email protected] to answer your questions about our quality control process! The images...Vector Characterization Methods for Quality Control Testing of Recombinant Adeno-Associated Viruses. In: Methods...

  7. Truncated gRNAs for Regulating Gene Expression

    Type
    Blog Post
    Published
    Jan. 10, 2017, 3:37 p.m.
    ...Lance-Byrne and Alex Chavez, researchers at the Wyss Institute for Biologically Inspired Engineering. CRISPR/...protospacer. The resulting double strand break (DSB) stimulates DNA repair mechanisms that can be exploited to...are limitations to a system that relies on two distinct Cas9 variants—nuclease-competent or nuclease-null—in...bacterial species, each of which interacts with a distinct gRNA that allows users to decide which Cas9 protein.... When complexed with a truncated gRNA, Cas9 is still able to bind DNA but is no longer competent to cut...

  8. Optogenetics + CRISPR, Using Light to Control Genome Editing

    Type
    Blog Post
    Published
    Sept. 3, 2020, 12:15 p.m.
    ...other split systems where light is required to reconstitute enzymatic activity. Photoactivatable genome ...(Kawano et al., 2015). Nicknamed paCas9-1 and consisting of the fusion proteins N713-pMag and nMagHigh1...far-red light-activated split-Cas9 (FAST) system constitutively expresses the C-terminal fragment of Cas9 while...Michael Lin, who developed a chimeric protein consisting of Cas9 and a photo-dissociable dimeric green... prevent DNA binding in the dark. Upon light stimulation, the pdDronpa moieties move apart, allowing DNA...LOV2 has a C-terminal helix that unfolds when stimulated by blue light. When fused to the catalytic site...

  9. An Introduction to Adenovirus

    Type
    Blog Post
    Published
    Oct. 3, 2023, 1:15 p.m.
    ...inactivation of the vector can still occur even in the case of no previous immunity existing for that adenoviral ...challenges remain (Wold & Toth, 2013).  While the pre-existing toolbox for adenoviral vectors in Addgene’s repository... – and we hope that it inspires further use of existing vectors, as well as research into the development...M. (1999). Ovine Adenovirus Vectors Overcome Preexisting Humoral Immunity against Human Adenoviruses In...

  10. Tips for arabidopsis transformation

    Type
    Blog Post
    Published
    Oct. 25, 2018, 1:23 p.m.
    ...student at Stanford University. Arabidopsis is a fantastic model organism for many reasons, not the least...Agrobacterium tDNA insertion likely precipitated domestication of sweet potatoes (Kyndt et al., 2015)! It sounds...too old to transform. This transformation could still work, but the efficiency will be low. Tips: Use...plants: If you transform early, your plants will still have plenty of time to produce seeds after you expose... plant’s flowers inside. 50 mL falcon tubes or plastic weigh boats are both great options for this, depending...

  11. Plasmids 101: Shuttle Vectors

    Type
    Blog Post
    Published
    May 20, 2025, 1:15 p.m.
    ... plasmid is delivered to your target cells, you still need to select for the cells that contain it. Antibiotic... approach in a mammalian cell experiment should still include an antibiotic resistance gene for growth...express your protein of interest. However, you do still need a species-compatible promoter for expressing... consider the viral vectors themselves to be a distinct gene delivery method. We focused this post on ...between prokaryotes and eukaryotes. Conclusion I still think it’s pretty incredible that my cells “speak...

  12. Twenty Years of Sharing: Expanding Accessibility

    Type
    Blog Post
    Published
    Nov. 21, 2024, 10:47 p.m.
    ...range of logistical barriers. Addgene worked to identify, reduce, and remove these logistical barriers...for people depositing plasmids and for people requesting them. Prior to this, many plasmids were available...packages navigated customs and arrived at their destination in a timely manner and at the correct temperature...to scientists across the globe?” By asking this question, and by listening to the answers from our community...

  13. CRISPR 101: Which Cas9 Do I Choose for My CRISPR Experiment?

    Type
    Blog Post
    Published
    Oct. 13, 2022, 1:45 p.m.
    ... 1–9 (2017).Walton, R. T., Christie, K. A., Whittaker, M. N. & Kleinstiver, B. P. Unconstrained genome... effects. The SpG variant, discovered by the Kleinstiver group has a PAM of NGN (Walton et al., 2020)....Don’t want to permanently modify the genome but still want to affect gene expression? dCas9 can be used... and antibody-activator fusion proteins. The Synergistic Activation Mediator complex, generally the strongest...

  14. Beyond the Blood Brain Barrier: PHP.B Enters the Central Nervous System Via the LY6A Receptor

    Type
    Blog Post
    Published
    July 23, 2019, 12:46 p.m.
    ...phenotypes. Two labs, the Deverman lab at the Broad Institute and the Wilson lab at the University of Pennsylvania...the brains of C57BL/6J mice and BALB/cJ mice, suggesting it was a likely player in PHP.B permissiveness...receptor (AAVR). Cell lines lacking galactose were still transduced by PHP.B but only if Ly6a was expressed...with PHP.eB, an enhanced version of PHP.B, virus still reached the brain endothelial cells of these mice... available from Addgene. References Holmes, Christina, and William L. Stanford. "Concise review: stem...

  15. Lab to Office Culture Shock

    Type
    Blog Post
    Published
    Feb. 5, 2019, 1:04 p.m.
    ...was applying. I probably did not respond to her question as well then as I would now. I would have to repress... repress laughter if I was asked that question today, because I sometimes wish for a stretch of time that...me, “I find that at a desk, it is much easier to stick to timelines. This is probably because you don't...careers and desk jobs “alternative careers.” Realistically, based on the numbers of PhDs and available ...into science in the first place. Finally, if you still find the idea of not holding a pipette again upsetting...

  16. Overcoming the AAV Size Limitation for CRISPR Delivery

    Type
    Blog Post
    Published
    Sept. 16, 2020, 1 p.m.
    ...full length gene and/or protein is reconstituted. One way to reconstitute a split protein like Cas9 is to...allow for more room for regulatory sequences while still fitting Cas9 and its gRNAs into one AAV, Cas9 must...confirming its suitability for in vivo studies. Testing AAV-SaCas9 in vivo To test the efficiency of AAV-SaCas9...Nogales E, Doudna JA (2019) CasX enzymes comprise a distinct family of RNA-guided genome editors. Nature 566...

  17. Fluorescent Proteins 101: Aptamer Fluorophores

    Type
    Blog Post
    Published
    April 11, 2017, 2:30 p.m.
    ...synthesis (those of us who have used antibodies for diagnostics know how frustrating it can be to get a “bad ...the bound protein fluorophores and quenchers are still relatively bulky. One of the advantages of oligonucleotides...stable and brighter version of the aptamer, but it still had limitations in vivo. Using a combination of ... a lower magnesium dependence. Though initially still unstable in eukaryotes, the Jaffrey lab has since...et al. “Aptamer-based assay for prion diseases diagnostic”. Procedia Environmental Sciences. Volume 12,...

  18. New CRISPR Tools: Cas7-11 and PASTE

    Type
    Blog Post
    Published
    Feb. 17, 2022, 2 p.m.
    ..., black pellet was sent to the AbuGoot lab for testing, they weren’t sure what they would find… but it...new CRISPR effector protein they named Cas7-11. Testing showed that Cas7-11 cut RNA with unprecedented ...insertions, and deletions. But CRISPR’s uses were still limited to small deletions and small insertions,...that gap. Consider, for instance, a disease like cystic fibrosis, which can be caused by thousands of different... Yarnall, Cian Schmitt-Ulms, Rohan N. Krajeski, Justin Lim, Lukas Villiger, Wenyuan Zhou, Kaiyi Jiang,...

  19. Tips for Using FRET in Your Experiments

    Type
    Blog Post
    Published
    Nov. 5, 2014, 3:41 p.m.
    ...the way we apprehend molecular complexes and is still a very useful tool.    Like a guitar hero (that ...SYFP2A, mTurquoise/mVenus and others. CFP-YFP is still one of the best and most used pairs to measure FRET... is difficult to address especially when you investigate unknown molecular complexes. But it is a parameter... faster measurement systems, this technique has still many good days and good “gigs” ahead...No offense...Chemiluminescence Resonance Energy Transfer    Interesting Articles About FRET: Piston DW, Kremers GJ. ...

  20. Hot Plasmids: Summer 2024

    Type
    Blog Post
    Published
    Aug. 27, 2024, 1:15 p.m.
    ...epigenetic editor consisting of dCas9 fused to a DNA methyltransferase — that can drive lasting transcriptional...cofactor fused to a histone tail to recruit and stimulate the endogenous methyltransferase. The strategy...H3K4me0 on D3L, releasing the autoinhibition and stimulating the methylation of nearby CpG sites on the target...expression off. Plus, DNA methylation is a long-lasting repressive marker, allowing the team to develop...
Showing: 301 - 320 of 841 results