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  1. From our Table to Yours: An Inside Look at Lunch at Addgene

    Type
    Blog Post
    Published
    Nov. 27, 2013, 2:54 p.m.
    ...four of us would eat together every day, sharing ideas for the company, but also talking about sports, ...Addgene. We’re a small non-profit, so we can only provide free food on special occasions. However, employees...and make time for special projects? We borrowed an idea from the software folks and started Hack Days. During...plasmid protocols for our website. Free lunch is provided for participants during the Hack Days, and we’...Lunches” With more employees, Addgene has naturally divided into smaller functional teams. Our Executive Director...make time for free food, and these lunches would provide a friendly setting for people in different labs...Who knows what could come out of it? Perhaps new ideas or collaborations, or at least a shared sense that...
  2. Three Key Considerations for Precise Neuronal Targeting Using AAV Technologies

    Type
    Blog Post
    Published
    Nov. 27, 2019, 2:03 p.m.
    ...practices and guidelines. It was wonderful to see the development of this practical guide by the workshop...networks, and specific neuronal populations to consider. To tease apart how different neurons impact a... discussions as a publicly accessible practical guide which was recently published in Frontiers in Neuroanatomy...experimental approach you choose, it’s essential to consider the technical limitations of each approach and...science.   Check out the precise neuronal targeting guide here! Additional resources on the Addgene blog ...retrograde AAVs Resources on Addgene.org Read our AAV guide Learn more about our viral service Find retrograde...
  3. HA Frankenbody, a New Imaging Tool to Visualize Single Molecules and Nascent Peptides

    Type
    Blog Post
    Published
    Oct. 10, 2019, 12:41 p.m.
    ...living systems, and often do not fold properly once inside cells.  Developing the HA frankenbody To combat...genetically encoded antibody based probe that detects the widely used HA epitope in diverse cellular environments...epitopes (Ewert et al., 2004). This scFv hybrid provides the probe structure and stability from the scaffold...translated quickly by the ribosome. This feature provides HA frankenbody the ability to bind nascent HA ...a versatile tool that can be used to visualize a wide range of protein dynamics in vivo. In the future...Resources on Addgene.org Read our fluorescent protein guide Find plasmids for subcellular localization Find ...
  4. Form Your Own Peer Mentoring Group: A How-To Guide for Scientists

    Type
    Blog Post
    Published
    Feb. 18, 2014, 4:22 p.m.
    ... organization, contact me! I can provide a step-by-step, how-to guide to get one started. Advantages ...communication skills. The leader also provides materials such as pre-reads, videos or exercises to be completed...increases the diversity of input and perspectives Provides a good mechanism for accountability that makes...to talk about?” There are an infinite number of ideas on the internet, but start by downloading my handy...collected. The next blog in this series will have more ideas on what to do once you are in a mentoring relationship...Peer Mentoring relationships? Comment below with ideas from your own mentoring group or with any questions...
  5. Download Addgene’s Science Career Guide, Plus 8 Career Tips from Addgenies

    Type
    Blog Post
    Published
    Feb. 26, 2019, 1:40 p.m.
    ...one comprehensive, downloadable guide: the Addgene Science Career Guide. We also asked Addgenies what their...endeavor.  Break the process down into steps and set aside time during the week to tackle each one.  Get the...you’d like to see discussed on the Addgene blog, consider writing a guest post. Additional resources on...careers blog posts Read our transferable skills guide Resources on Addgene.org Find job listings at ...
  6. Viral Genome Sequencing - A One Stop Shop for AAV Identity and Serotype Confirmation

    Type
    Blog Post
    Published
    April 23, 2020, 1:15 p.m.
    ..., Moullier P, Ayuso E, Vandenberghe LH (2017) AAV-ID: A Rapid and Robust Assay for Batch-to-Batch Consistency...sequencing (NGS) QC platform that allows us to provide scientists with complete plasmid sequences. After... viral genome sequencing (VGS), to confirm the identity and serotype of our AAV preparations. We recently...an effective tool to confirm AAV vector genome identity. These studies used SMRT sequencing, TA-based ... that VGS can quickly and reliably confirm the identity of AAV genomes and detect contaminating AAV DNA...packaging cell line, helper and packaging plasmids. We decided to use this to our advantage by designing a Python...from multiple AAV lots can be run in parallel and provide serotype data in minutes and the scripts  can be...
  7. Golden Gate Assembly Upgrades: More Fragments, Faster Assembly, and Higher Fidelity

    Type
    Blog Post
    Published
    Oct. 11, 2018, 12:30 p.m.
    ...choice of junction sequences guided by experimentally-derived DNA Ligase fidelity data. Our work demonstrates...accuracy of assembly. The fidelity data can be applied to derive similar high-fidelity overhangs for any Golden...Reactions are often cycled between 37°C and 16°C to provide optimal reaction temps for both the restriction...appropriate levels of colony plating densities. Ligase fidelity and assembly efficiency Five fragment lacI/lacZ...redesigned for 12 and 24 fragments.  This redesign was guided by both advances in the re-engineering of the original...restriction enzyme and the completion of T4 DNA Ligase fidelity studies conducted by Potapov et al. at NEB (1,...Recently, NEB researchers profiled the comprehensive fidelity of cohesive end ligation by this enzyme for all...
  8. Controlling for Off-target Effects with a New Genome-wide CRISPR Screen Design

    Type
    Blog Post
    Published
    Sept. 13, 2018, 1:55 p.m.
    ...safe-targeting guides vs. non-targeting guides on screen analysis and hit calling. 5,644 non-targeting guides and...short guides had reduced toxicity compared to full-length guides. Reduced toxicity of short guides could...genes identified with short and long guides. Together these results suggests  that short guides have fewer...demonstrate safe-targeting guides as a potential control, and provide evidence that truncated gRNAs have...Genome-wide CRISPR/Cas9 screens are a high-throughput systematic approach for identifying genes involved...biological process. These screens provide an alternative to genome-wide RNAi screens, which although highly...questions about genome-wide CRISPR/Cas9 screen design Are non-targeting guides an appropriate control...
  9. Quick Guide to Working with Drosophila Part 2: Controlling Gene Expression in Flies with Gal4/UAS

    Type
    Blog Post
    Published
    July 21, 2017, 12:48 p.m.
    ...Harvard University. In this second post in our quick guide to working with Drosophila, you’ll learn how to ... flies. Read the first post here. Once you’ve identified some fly stocks and other reagents of interest...pathogens and their hosts. It’s not always clear which side he roots for. You can try to convince him to use...
  10. Pooled CRISPR Libraries Offer Genome-Wide Control for Large-Scale Functional Screens

    Type
    Blog Post
    Published
    Feb. 24, 2015, 7:50 p.m.
    ...This is the next step in high-throughput, genome-wide screening,” Konermann said. “If you want to activate...only do that screen with a system you are really confident about working for most genes and individual targeting...protein. SAM can be combined with a human genome-wide library to activate all 23,430 known coding isoforms... we could use information from the structure to guide and improve activator design,” she said. “Before...exposed RNA loops, which Konermann recognized as an ideal spot to fuse the activators instead of at the protein...consistency and validation with >80% effectively enriched guides per gene hit, and 100% validation of the top 10...genes of interest. They also “showed that different guide RNAs have different abilities to turn genes on and...
  11. 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.
    ...enzymes." Science 362.6416 (2018): 839-842. PubMed ID PMID: 30337455. Additional resources on the Addgene...systems were merely adaptive immune systems that provide bacteria protection against infectious agents. ...predicted that many others are still unknown. Identifying Cas14 variants In this quest to discover new ...that improved specificity of Cas14 enables high-fidelity SNP genotyping. The development of  Cas14-DETECTR...Find the Cas14 plasmids here Checkout our CRISPR guide page Browse the CRISPR collection ...
  12. A Needle in a Base-Stack: Cas9 Structural Biology

    Type
    Blog Post
    Published
    June 4, 2024, 1:15 p.m.
    ...in the apo state (PDB ID 4CMP, top) compared to the guide RNA-bound state (PDB ID 4ZT0, bottom), seen from...structure (left, PDB ID 4ZT0) with Cas9:RNA:DNA electron microscopy structure (right, PDB ID 7S4X), viewed from...bound to guide RNA (PDB ID 4ZT0), shown opaque (left) and transparent (right). The RNA guide sequence ...Figure 5: S. pyogenes Cas9 bound to guide RNA and target DNA (PDB ID 7S4X). Residues R1333 and R1335 from...structure of S. pyogenes Cas9 bound to guide RNA and target DNA (PDB ID 7S4X), shown opaque (left) and transparent...Figure 7: S. pyogenes Cas9 bound to guide RNA and target DNA (PDB ID 7S4X). The end of the DNA:RNA heteroduplex...structure of S. pyogenes Cas9 in the apo state (PDB ID 4CMP) with domains colored as in Figure 1. HNH, red...
  13. More Data for You: Find Articles Citing Addgene Plasmids

    Type
    Blog Post
    Published
    June 16, 2015, 2:15 p.m.
    ...with the Plasmid Name, Addgene Plasmid ID #, and the PubMed ID # (PMID) for the article that has used ...it has been validated in.  If a plasmid's Addgene ID # has been referenced in other publications, you'...used your plasmid of interest, which may help you identify relevant protocols and experimental data Find...
  14. Increasing Your Work's Visibility with Addgene: Citation, Search, and Collections

    Type
    Blog Post
    Published
    March 10, 2016, 3:30 p.m.
    ...we request that you cite it using both its Addgene ID number as well as the reference for its original ...cite a plasmid from Addgene using its unique Addgene ID number, your publication will be listed on our website... You can search for plasmids by name, PI, Addgene ID number, or keyword. Although an initial search might...plasmids from Addgene right on our plasmid pages and provide a citation that you can put straight into your ...search results using the filters found on the right side of the search page. A great breakdown of our search...search functionality can be found in the following video: Please remember that the accuracy and reliability... Blog Post on Our Citations Feature Browse More Inside Addgene Posts Additional Resources on Addgene....
  15. Introducing Addgene's New Search - Find Plasmids More Easily For Your Research!

    Type
    Blog Post
    Published
    Dec. 3, 2019, 11:38 a.m.
    ...were able to include specific plasmid ID numbers. If you know the ID number for a plasmid, your straightforward...by our own CSO. But what if you don’t have plasmid ID numbers, or you aren’t sure if any plasmids from ... associated plasmids through the article’s PubMed ID (PMID) ...or DOI Or get some keywords close enough...more. Selecting crispr in Guides will return links including our CRISPR guide.  For a closer look at this...search. These pages provide helpful information about the subject, link to related guides and protocols, and...delivering a calcium biosensor using AAV, you might decide you’d really prefer to order ready-to-use virus...search will start from a publication. You may have an idea for a plasmid that would be useful in an experiment...
  16. How to Deposit Your Plasmids with Addgene

    Type
    Blog Post
    Published
    Feb. 27, 2024, 2:15 p.m.
    ...entering the data. This step associates an Addgene ID with your plasmids, and adding all the plasmids at...likelihood that the plasmids are given sequential IDs.   Name – we encourage the use of descriptive plasmid...include the total size of the insert and the GenBank ID associated with your insert. Pro Tip! If the correct...and the vector type. Pro Tip! Reference the Addgene ID in the "Backbone Manufacturer" box for backbones ... Confirmation email from us with a unique Deposit ID. Addgene will send you a package containing instructions...scientists worldwide. What's more, depositing is free! We've written this post as a step-by-step guide to the...will not make the plasmids available until you provide us with updated publication information or permission...
  17. Searchable and Sortable gRNAs for Your Next CRISPR Experiment

    Type
    Blog Post
    Published
    May 17, 2016, 2:30 p.m.
    ...Addgene plasmid ID (if we have one associated with the gRNA), application, cas9 species, PubMed ID, and depositor...published article. This blog post will serve as a guide to use our validated gRNA Target Sequence Table....sequence variations (e.g. SNPs) exist. Additionally, consider testing multiple gRNAs targeted to the same locus.... As you develop and confirm new gRNAs, please consider submitting their sequences (and plasmids!) so ...Addgene.org Browse gRNA Design Tools Read Our CRISPR Guide Pages Find CRISPR Plasmids  ...
  18. Tips from the Repository Trenches: Using Barcodes to Track Samples

    Type
    Blog Post
    Published
    Oct. 6, 2015, 2:30 p.m.
    ...and make sure they have been barcoded with a unique ID number (1D barcode as shown below). This number ensures...samples. They will help your lab ensure that sample ID’s are unique, consistently labeled, and that numbers...barcode to the container holding the tubes and use this ID to name the corresponding Excel sheet.3. Be specific...the 2D barcodes mentioned above. These barcodes identify what type of sample is contained within the tube...tube’s appropriate location. The barcode also identifies the contents of each individual tube.  If a plate...bacteria with the plasmid can grow. As the bacteria divide, they replicate and retain the plasmid. This allows...store a lot of information in a small space and is ideal for tracking large collections. Many companies, ...
  19. Behind the scenes: Addgene’s new search engine and more

    Type
    Blog Post
    Published
    Dec. 12, 2019, 2:22 p.m.
    ...search scoped to that category. Catalog ID suggestions provide shortcuts to specific catalog items as ...contains a plasmid with the catalog ID). Depositor suggestions provide shortcuts to matching PI labs and...educational resources — including blog posts, protocols, guides, and collections — is a lot of material to sift... the different usage patterns the larger team identified. The basic function of a search engine is to ...through our educational resources. Filters We identified the most useful kinds of information per resource...words, phrases, partial phrases, or numerical identifiers. We also combine the different terms in a query... name in the publication field. Suggestions We provide as-you-type suggestions in different ways. Keyword...
  20. CasPEDIA: A Functional Classification of Cas Enzymes

    Type
    Blog Post
    Published
    Jan. 25, 2024, 2:15 p.m.
    ...the former, you simply type in identifier keywords (Cas name, RefSeq ID, etc.) and you will see a table...got you covered!     Fig. 1 – CasPEDIA Cas ID display information for a given Cas (SpyCas9a) from...not so long ago, spCas9 was the only Cas enzyme widely available and applied by researchers for gene targeting...experimental fit due to this. But now, it’s time to cast aside those concerns and embrace a new resource to solve...CasPEDIA is an online, searchable resource that provides summary information on Class 2 Cas enzymes. The...requirement, gRNA, and multiplex ability Experimental guidelines and applications Protein structure and properties...experiment. Target requirements As we all know, a Cas guided by a gRNA is useless without an adjacent PAM or...
  21. Making CRISPR Plasmids Using Fragmid

    Type
    Blog Post
    Published
    Aug. 29, 2024, 1:15 p.m.
    ...with the ID of the component plasmid, component name, size, and any comments. You can use the ID to look...it’s easy to switch out reporters, Cas proteins, guide cassettes, promoters, N’ and/or C’ terminus, and...Bbsl, a Type II restriction enzyme that cleaves outside of its recognition sequence. This means that each...Mammalian Lentivirus pRDA_512 (RSV-driven; lentiGuide-based) Mammalian Lentivirus pRDA_722... the design process down into four easy steps, provides the real value for the user. Let's walk through... Plasmids 101: Modular Cloning Addgene's CRISPR Guide Plasmids 101: Golden Gate Cloning...
  22. pCXLE toolkit: Efficient episomal plasmid-based method to reprogram peripheral blood cells to iPSCs

    Type
    Blog Post
    Published
    Dec. 14, 2017, 2:08 p.m.
    ... Addgene ID numbers and the reprogramming factors they encode Episomal Plasmid Addgene ID# Encodes ...iPSCs. The generation of human iPSCs (hiPSCs) now provides an opportunity to develop and use patient-specific...fibroblasts [3]. These advantages make PBMCs the ideal source of somatic cells for reprogramming purposes...field [4]. Three major reprogramming methods are considered when generating hiPSCs for clinical purposes:... of the procedure. Episomal reprogramming is an ideal and cost-effective method for creating clinical-...reported efforts. The pCXLE episomal system thus provides a practical way to generate transgene-free, virus-free...
  23. Plasmids 101: A Brief History of Plasmids and an Improved eBook!

    Type
    Blog Post
    Published
    Oct. 29, 2015, 2:30 p.m.
    ...“plasmid” derived as a hybrid of "cytoplasm" and "id" (Latin for 'it'), as “a generic term for any extrachromsomal...noted that, unlike F-factors, the evidence did not support the idea that R-factors could integrate into... Élie Jacob and François Wollman and became the widely adopted name for these elements. At the time, the...Herbert Boyer, and Charles Brinton concocted a wild idea of using the newly discovered EcoRI enzyme (and ...such as pBR322, pACYC, and pUC were developed to provide higher copy number vectors that could be used in... with our goal of creating a one-stop reference guide for plasmids we've updated and added new content...Datta, Naomi. “Transmissible Drug Resistance in an Epidemic Strain of Salmonella Typhimurium.” The Journal...
  24. Hassle-free 96-well Format Epitope Tagging Using Cas9 Ribonucleoprotein

    Type
    Blog Post
    Published
    June 28, 2018, 3:01 p.m.
    ...ssODN: Using Ensembl Transcript ID(s) as an input query, pick crRNA (guide RNA sequence targeting the gene...tagging experiments: Retrieve Ensembl Transcript ID(s) of your favourite gene(s) from Ensembl genome ...coupled to high-throughput sequencing to identify genome-wide binding patterns of the target protein. ... not work in pull-down assays: Epitope tagging provides a solution Proteins - the workhorses of the cell...complexes are then analysed by mass spectrometry to identify the interacting proteins. Similarly, in ChIP-seq.... Both IP/MS and ChIP-seq methods provide a wealth of information about how protein networks work in ...to mention frustrating. One elegant solution to sidestep the antibody problem is to tag the protein of ...
  25. Dos & Don'ts When Publishing a Scientific Manuscript

    Type
    Blog Post
    Published
    May 22, 2014, 4:02 p.m.
    ...bit like a GenBank ID) to all antibodies, animal models, and software tools in the Materials and methods...scope for the journal’s coverage. These guidelines also provide information on a journal’s house style ...Resource Identification Initiative. During this project, authors are asked to add an identifier (a bit ...vivo research and the CARE guidelines for case reports are two sets of guidelines frequently used by editors...information is provided. The clearer you write your paper and the more information you provide on data, materials...publication in a scientific journal requires several considerations. First, it is important to establish the type...audience you want to reach with your paper. Is it the wider scientific community, or are you writing for a specific...
  26. Summer SciComm: Preprints

    Type
    Blog Post
    Published
    Aug. 16, 2022, 1:15 p.m.
    ...significantly sooner. Plus, authors can include the Addgene ID for their deposited plasmids in the final journal...used in a preprint provides all the same benefits as sharing those plasmids alongside a journal article...different goals, formats, and processes, and they provide different amounts of access or feedback. One of...) in the past few years.   Fig. 1: Stand aside, CERN - it's a new age of accelerating science! ...contrast, journal-based peer review is usually a confidential process among a few individuals.  Early-career...especially enjoy the ability to post a preprint as evidence of their productivity that can be shared with ...funding bodies and review committees encourage and consider preprints as demonstration of productivity.  Part...
  27. Reproducibility for Everyone: Lessons from an Open Science Collaboration

    Type
    Blog Post
    Published
    Feb. 28, 2019, 1:34 p.m.
    ...Reproducibility Read a blog post on Unique and persistent IDs for improved reproducibility Other resources: Reproducibility...practices could be an actionable way to tackle widespread irreproducibility. Luckily, there were other ...academics and like-minded organizations with similar ideas who were also thinking about reproducibility and...Thanks to Teytelman’s vast network and ability to identify the right opportunities, he was able to bring ...and motivated groups and individuals with similar ideas to actually do something about it. Building a diverse...received, and then when the team started brainstorming ideas for the next workshop, they realized that holding...enable reproducibility practices being adopted by a wider group of researchers. Generating material to empower...
  28. New Tool for Lineage Tracing: The ClonTracer Library

    Type
    Blog Post
    Published
    Sept. 22, 2015, 2:30 p.m.
    ... a post-doc in the Target ID and Validation Group and says that she decided to do a post-doc at Novartis...library, propagated it, separated it into roughly identical replicate groups, and treated these groups with...cell line containing an activating mutation in epidermal growth factor receptor (EGFR) with the ClonTracer...models. She hopes that the library can be used to identify appropriate, non-overlapping targets for drug ...distinct evolutionary paths to become resistant to epidermal growth factor receptor inhibition." Nature medicine...
  29. Enhancing CRISPR Targeting Specificity with eSpCas9, SpCas9-HF1, & HypaCas9

    Type
    Blog Post
    Published
    Dec. 16, 2015, 3:30 p.m.
    ...Looking at the structure of the Cas9 nuclease (PDB ID: 4OO8 and 4UN3), Slaymaker et al. hypothesized that...Benjamin P., et al. "High-fidelity CRISPR–Cas9 nucleases with no detectable genome-wide off-target effects."...As evidenced by all the CRISPR publications, press, and plasmids out there, it’s obvious that CRISPR ...1.1), followed by a technique for detecting genome-wide double strand breaks (BLESS), revealed that these...as predicted, decrease off-target effects genome-wide. Further work by Slaymaker et al. showed that these... al. "Crystal structure of Cas9 in complex with guide RNA and target DNA." Cell 156.5 (2014): 935-949....Website Find CRISPR Plasmids Browse our CRISPR Guide Pages Find Genome Engineering Resources ...
  30. Lab Automation at Addgene

    Type
    Blog Post
    Published
    March 22, 2018, 1:28 p.m.
    ...removable parts to fit on the deck of the Biomek. The FXP id also able to do high throughput DNA preps and other...purification, and filling vials with agar. I’ll also provide you with some tips on how to automate some simple...protocol and, after looking at a few options, we decided on Beckman Coulter’s Biomek FXP. We had a previous...scale. Using the BIOROBOT Universal Platform is ideal because it eliminates the potential of human error...standard molecular biology techniques Browse our video library Check out our molecular biology reference...
  31. Common Injection Routes in Mice

    Type
    Blog Post
    Published
    Jan. 22, 2025, 9:42 p.m.
    ...Skill required: beginner Intradermal Intradermal (ID) injections occur between the layers of the skin.... post has provided a good introduction to common injection routes in mice! When considering what method...administering vaccines, pain meds, or other drugs. Identifying the proper injection site is straightforward,...knowledge. Intrathecal injections are used for a wide array of purposes, but mainly for the delivery of...sounds very disruptive, but surprisingly, it is considered minimally invasive. Restraint: anesthesia Location...common. Due to the intubation, this procedure is considered quite invasive. Restraint: anesthesia Location...feeding tube with a bulb on the end, which prevents accidental tears or punctures to the throat. The feeding...
  32. Supporting Reproducibility with a Connected ELN

    Type
    Blog Post
    Published
    Jan. 17, 2019, 1:38 p.m.
    ... It’s possible to associate the depositor’s ORCID ID with the deposit, and a DOI is added to the deposit...integration is described in this video and the Figshare integration in this video.  The ability to link from...making it searchable and shareable, but some ELNs provide better support for reproducibility than others....reproducibility is limited in two ways – only data inside the ELN is reproducible, and only the highly restricted...requirements that emerged from intensive engagement with a wide range of people at the University of Wisconsin in...principles in mind, and in response to further input provided by the research communities at the University ...online file storage tools, as illustrated in this video, and to data stored on institutional and lab servers...
  33. Tips for arabidopsis transformation

    Type
    Blog Post
    Published
    Oct. 25, 2018, 1:23 p.m.
    ...https://books.google.at/books/about/Arabidopsis.html?id=IfZAMNPWVk4C&redir_esc=y (Accessed: 21 September ...culture into a container that is wide enough to dunk your plant’s flowers inside. 50 mL falcon tubes or plastic...process right the first time. I’ll lay out some guidelines here. A detailed transformation protocol, as ... et al. (2006) ‘A rapid and robust method of identifying transformed Arabidopsis thaliana seedlings following...
  34. The Challenges of Cell Culture

    Type
    Blog Post
    Published
    May 5, 2016, 2:30 p.m.
    ...Short Tandem Repeat (STR) profiling can be used to ID the cell line. The same test is so good that it is...many journals strictly require evidence of cell line provenance and identity. The Nature Publishing Group...Resources ATCC Animal Cell Culture Guide Thermofisher Guidelines for Maintaining Cultured Cells Invitrogen...Invitrogen Cell Culture Basics Guide Abcam Cell Culture Guidelines Resources on the Addgene Blog Learn ...culture in the present day Cell culture is a widespread tool used in the fields of oncology, virology...this reason. Unreproducible results are rife. Misidentified or cross-contaminated cells have been known ...Invasion in Renal Cancer Cells, Marker-independent identification of glioma-initiating cells. The International...
  35. Easi-CRISPR: Generating Knock-In and Conditional Mouse Models

    Type
    Blog Post
    Published
    April 5, 2018, 12:42 p.m.
    ...desired insert (e.g., mScarlet).   Plasmid ID Plasmid Name Tags 69090 pMJ915 MBP (N...differences in guide RNA efficiency. For example, in a two-guide floxed experiment, if one guide cleaves less...from the target exon on either side. They have successfully used guides targeting the same or complementary...on each side. For optimal repair, place the loxP sites precisely at the cut site for each guide. This design...RNP) complexes of Cas9 protein and the separated guide RNA components (crRNA and tracrRNA) for maximum ...given location, you’ll need to design only a single guide and your donor ssDNA. Here, we’ll use the example...homology-directed repair experiments, you’ll want the guide cut site to be as close as possible to your desired...
  36. FLEx Technology and Optogenetics: Flipping the switch on gene expression with high spatial and temporal resolution

    Type
    Blog Post
    Published
    Oct. 17, 2019, 12:28 p.m.
    ...Biology. New York: W. H. Freeman, 2000. Bookshelf ID: NBK21668. Matsuno-Yagi, Akemi, and Yasuo Mukohata...neuronal subpopulations, and this represents a major downside in optogenetics (Belzung et al., 2014). This could...genes. Strong cell-specific promoters, on the other side, are too long for rAAVs, which can only package ...Double-floxed Orientation)) is a powerful tool that provides precise temporal and spatial control of gene expression...produce behavioral and electroencephalography evidences of arousal in mice previously subjected to steady-state...., 2019). FLEx vectors represent, therefore, an ideal partner to optogenetics to understand the cellular...
  37. Antibody Validation for Flow Cytometry

    Type
    Blog Post
    Published
    Sept. 10, 2024, 1:15 p.m.
    .... (2024). A guide to selecting high-performing antibodies for Synaptotagmin-1 (Uniprot ID P21579) for ...antibodies when possible. If cost is prohibitive, consider an approach that prioritizes more reproducible... rate. If you need a more permanent knockdown, consider using shRNA vectors instead. With both siRNA and...this approach should also allow for the clear identification of the cell types of interest. By correlating...correlating your data sets, you can increase confidence that the labeling observed represents the expression ... at similar levels in your cell lines, you can consider a cell treatment approach. If there is a cell ...protein. A challenge to this approach is that the identity of the epitope is often not available to confirm...
  38. 27 Hot Plasmids from 2016

    Type
    Blog Post
    Published
    Dec. 22, 2016, 3:03 p.m.
    ...immunohistochemistry, and are summarized in the table below:   ID Cv (Capsid) FLAG Tag Terminus 79629 (N) and 79628... Neurosci 2016. PubMed PMID: 26950006 Plasmid ID Plasmid Name Plasmid Type 74309 pcDNA3.0-TRPV4-...DHS-seq, FAIRE-seq, and CHIP-seq), genome-wide identification and quantification of enhancer activity have...RNA-guided targeting mechanism. However, the laborious construction of repair templates and guide RNA ...: Targets of RNA-binding proteins identified by editing Identifying targets of RNA-binding proteins (RBPs...region sequencing) that tests enhancer sequences outside of their endogenous chromatin environment and relies...screen the entire genome for genes that regulate a wide variety of phenotypes, including but not limited...
  39. 15 Hot Plasmids from 2017

    Type
    Blog Post
    Published
    Jan. 9, 2018, 3:02 p.m.
    ...editing for precise genome modification. Plasmid ID Plasmid Name Cas9 Variant Speacial Features 85169...Cas9, been identified. In Rauch, et al. 2016 the Joseph Bondy-Denomy lab at UCSF identifes four proteins...our hot plasmids articles. These brief articles provide a synopsis of a plasmid or group of plasmids' functions...may be preferred for their intended uses, they provide a well-defined framework for the production of ...available at Addgene, and the Doyon lab has also provided a detailed protocol at Protocol Exchange. Plasmid...editors with editing windows as small as 1-2 nucleotides! To reduce off-target effects associated with... created HF-BE3, a base editor containing high fidelity Cas9 variant HF-Cas9. They subsequently tested...
  40. CrispyCrunch: High-throughput Design and Analysis of CRISPR+HDR Experiments

    Type
    Blog Post
    Published
    Feb. 7, 2019, 2:16 p.m.
    ...(See section below.) For guide design, we decided to adapt the popular guide design tool Crispor by Max...which the guide binds. However, if the PAM resides in a coding region, the mutation may cause side-effects...optimal mutation in CrispyCrunch: If the guide PAM resides outside a coding region in a UTR, CrispyCrunch... experiments designed outside CrispyCrunch, or you can input pre-existing guides for primer design. The...return guides and primers in batch, optimized for HDR. Compared to wealth of resources for guide design... summary per batch. Ranking guides for HDR in-depth In other tools, guides are ranked by specificity of...specificity of a guide to the target. The CFD score ranges between 0 and 100 for each guide, with 100 being...
  41. Sequencing Options for CRISPR Genotyping

    Type
    Blog Post
    Published
    Oct. 4, 2016, 2:30 p.m.
    ...genome-wide, unbiased identification of double-strand breaks (DSBs) evaluated by sequencing (GUIDE-seq) ... Not Provided 5% Inexpensive, simple Low-throughput, low sensitivity Sanger Sequencing Provided 20% ...PMC3782611. 8. Tsai, Shengdar Q., et al. "GUIDE-seq enables genome-wide profiling of off-target cleavage by ...gel electrophoresis. Surveyor™ and T7E1 have been widely adopted due to their relative simplicity and low... problem with these assays is that they do not provide sequence-level data. They also have a limit of ...sequencing. Used in concert, these approaches can provide the researcher with a reasonable level of certainly...off-targets. This is a valuable step toward enhancing confidence and reproducibility of a study’s findings. Table...
  42. Twenty Years of Sharing: Expanding Accessibility

    Type
    Blog Post
    Published
    Nov. 21, 2024, 10:47 p.m.
    ...Views Guides CRISPR Guide Lentiviral Guide AAV Guide Optogenetics Guide γ-Retrovirus Guide Protocols... popular videos are protocol videos, where showing exactly how to execute a step can provide needed clarity...accessible, due to a wide range of logistical barriers. Addgene worked to identify, reduce, and remove ...allowing people to access a wide catalog of plasmids from all over the world. This idea, that available and accessible...Addgene distributes to per year, 2005-2023. We identified and offered a number of solutions that increased...over half of our orders coming from researchers outside the USA, having some materials available to order...consistently accessible, wasn’t an option. So we identified countries that would benefit from a third-party...
  43. A Look at Addgene's QC Process

    Type
    Blog Post
    Published
    May 6, 2025, 1:15 p.m.
    ...plasmids we distribute to scientists worldwide. Depositing scientists provide different types of data for each...compared to the information provided by the depositor. If a depositor provides a sequence for the plasmid...sequences without a reference; and identifying mixed plasmid and nucleotide populations. All of these topics...if one was provided. If no reference is given, de novo assembly in Geneious can still provide additional... their presence with confidence. If this approach does not resolve the identified differences, the plasmids... both human and biological. Even the most high-fidelity polymerases can make mistakes and lead to the ...plasmids in our collection. This standardization provides security for requestors, ensuring that the plasmid...
  44. Comparing Cas9 to NgAgo: Can the Argonautes Best CRISPR?

    Type
    Blog Post
    Published
    June 9, 2016, 2:30 p.m.
    ...DNA guides NgAgo uses 5’ phosphorylated DNA guides (so called “gDNAs”) rather than the RNA guides employed...remains faithful to its guide DNA and cannot switch guides. While this fidelity would prevent other small...24 base DNA guides may be more user-friendly, since they can be ordered as oligonucleotides and should ...gDNA guides will also need to be transfected into the cells of interest. In contrast, RNA guides must ... tested if NgAgo preferred certain guide sequences - using 5 guides/gene for 10 genes, they did not observe... the DNA guide impaired NgAgo activity, with three mismatches abolishing activity. One-guide faithful...important role in RNA interference, binding RNA guides to cleave foreign RNA. Argonaute proteins are also...
  45. CRISPR 101: Validating Your Genome Edit

    Type
    Blog Post
    Published
    Nov. 3, 2022, 12:15 p.m.
    ...similar to TIDE known as TIDER (Tracking of insertions, deletions, and recombination events). TIDER can screen...both trace files to the TIDE tool online along with your sgRNA sequence. The TIDE software will generate...off-target effects with Sanger sequencing, provided you have some idea of where in the genome you might expect...knockouts is Tracking of Indels by Decomposition (TIDE) (Brinkman et al., NAR). This technique uses the... deletion frequency. Fig. 1: Overview of TIDE. The input is sequencing trace files of WT and edited...input population or clone.   How to perform a TIDE First, use PCR to amplify the target region of interest...graph representing all insertions and deletions identified within a given genomic window, along with the...
  46. Antibodies 101: The Basics of Western Blotting

    Type
    Blog Post
    Published
    March 8, 2021, 2:41 p.m.
    ...with peptide/protein analyses using ELISA. Peptides 72:4–15 . https://doi.org/10.1016/j.peptides.2015.04.012...vary the acrylamide content of the gel. For small proteins, use a higher percentage of acrylamide to increase...usually composed of a nitrocellulose or polyvinylidene difluoride (PVDF) in a step called protein transfer...they provide qualitative measurements. If you require precise quantification of a protein, consider using...immunoprecipitation and pull-down assays.  Westerns are divided into two categories, native and denaturing. In ... protein mix by size Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) is the first...agent, typically containing thiols, to cleave disulfide bonds. Load the samples, one sample per lane, ...
  47. 10 Steps to a Perfect Science Talk

    Type
    Blog Post
    Published
    Aug. 23, 2016, 2:30 p.m.
    ...Having answer slides ready after your formal conclusion slide will also help with your confidence. It is best...suspense. Notice the simplicity of their slides and how the slides complement the spoken message. Learn from...speak to start creating slides or thinking about content. Create a Google.slides or Powerpoint file right...this might sound condescending, consider explaining the term on a slide but not reading the explanation...everything I allow 1 slide for every 1 minute of talk length, and then I cut a few more slides. Do not run over...always be a future boss in the room, so it is a good idea to start thinking about public speaking early and...talks for non-academic settings. Many of these guidelines will apply to any type of science presentation...
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