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Showing: 181 - 200 of 1075 results

  1. Addgene: The First Twenty Years

    Type
    Blog Post
    ...process, which was a major barrier for depositors and requestors alike. We transformed this process by ...ready-to-use viral vectors from some of our most popular lentiviral and AAV vectors, as well as developing...privilege to find and share what stories we can, and to hear the stories others have to tell.  "Also thanks...amazing years in front of us. So in our last celebratory moment, we wanted to walk through some of our...service would allow people to add a gene to a repository others could request from — Addgene!  Addgene...meant we could grow accessibility alongside our repository.  “I’m sure you hear it all the time, but Addgene...took almost six years to reach our first major repository milestone — 10,000 plasmids deposited and available...

  2. CRISPR Activation: A Practical Guide

    Type
    Blog Post
    ...cheaper to use Cas9 activators. This larger scale of activation allows for exploratory-based research as...of the gene, Cas9 activators efficiently solve these problems.   Which Cas9 activator should I use? There...plastic tool and has taken the scientific world by storm. While Cas9 has been most widely used to create ...significant work on constructing Cas9 transcriptional activators. These constructs allow for the upregulation ...no longer activated. However, there are several factors that may prevent your gene from being up-regulated... we would recommend using a cDNA overexpression vector rather than going through all the troubleshooting...genome-wide studies One of the best uses for Cas9 activators is in genetic screening. gRNAs targeting every...

  3. The Challenges of Cell Culture

    Type
    Blog Post
    ...validation carried out by the commercial repository. Repositories generally ensure cell line identity and...which can be stored in liquid nitrogen long term, preferably some of these vials will be stored in a separate...in a cryostore log. Keeping good passage records allows you to track a cell line’s age and monitor any ...and money but cells lose provenance (this is the history of the cell line consisting of records of the origin...invariably much older than those available from biorepositories leading to genotypic and phenotypic artefacts...easier to conduct high quality cell culture. Biorepositories around the world ensure that the cell lines...The oldest, largest, and most diverse of these repositories is the American Type Culture Collection aka ...

  4. Adeno Associated Virus (AAV) for Cell and Gene Therapy

    Type
    Blog Post
    ...makes AAV vectors especially amenable to correcting disease-associated mutations. AAV vectors maintain...gene delivery by affinity-purified receptor-targeted viral vectors." Nature communications 6 (2015): ncomms7246... Check out our Viral Vectors Featured Topic Page Learn about CRISPR-AAV vectors Learn about Addgene AAV... is caused by mutations in the common cytokine receptor gamma chain (c) and is characterized by a lack...thereby correct the mutations using retroviral vectors. However, many diseases require techniques that...target cells has been challenging. A variety of vector delivery technologies have been investigated including...usability in clinical settings. On the other hand, vectors derived from AAV have recently gained popularity...

  5. Starter Guide to induced Pluripotent Stem Cells (iPSCs) Part 2:  Reprogramming and Transdifferentiation

    Type
    Blog Post
    ...are similar except that the vectors carrying the transdifferentiation factors are directly injected into... Kotton Four Factors that Differentiate the Stem Cell Field Learn how lentiviral vectors can be used for... involves overexpression of four reprogramming factors- OCT4, SOX2, KLF4, and C-MYC - that induce a differentiated...another cell type of choice. The four reprogramming factors can be delivered and expressed in multiple somatic...supplements, bioactive small molecules, and growth factors are used to control the cell fate of iPSCs and ...         Adipocytes [28] Keratinocytes [29] Photoreceptors [30] Otic hair cells [31] Neurons [32, 33... intermediate pluripotent state is not always obligatory in cell conversion processes [35]. Rather than...

  6. Early Career Researcher Toolbox: Free Online Molecular Biology Tools

    Type
    Blog Post
    ...In-Fusion cloning molar ratio calculators Lab math calculators These calculators can help you with common...lab. Molarity calculator Promega's Biomath Calculators Primer resuspension calculator (sign-in required...data repository for validation data on Addgene/CLOVER viral vectors.  Caspedia: A data repository for ....)  DailyCalcs Science Calculator app for iPhone Reagent and Data Repositories These links can help you... for plasmid design and mapping. ApE (A plasmid Editor): A free, donation-based plasmid analysis tool ...enzyme cut sites Open reading frame finder  Addgene vector database: Find sequences for plasmids assembled...Golden Gate Reactions Cloning ligation reaction calculators These links can help you calculate how much insert...

  7. Plasmids 101: Common Lab E. coli Strains

    Type
    Blog Post
    ...Stable   For cloning into and storage of lentiviral and retroviral vectors or cloning or repeated sequences...derived. For cloning into and storage of lentiviral and retroviral vectors or cloning or repeated sequences... HB101. For cloning into and storage of lentiviral and retroviral vectors or cloning or repeated sequences...cells for cloning and storage of unstable DNA and lentiviral/retroviral vectors. Used by Addgene for pooled... your plasmid or carrying out your experiment. History of E. coli strains E. coli are gram-negative, rod... DH5alpha and DH10b (also known as TOP10). The history of B strain is a bit more convoluted due to researchers...researchers sharing and renaming samples throughout history. It was likely isolated in 1918 but was first referred...

  8. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    ...reaction to generate high-throughput targeting vectors. These vectors can be used to tag endogenous genes and...the final targeting vector (Fig. 1, Step 4), and co-injection of the targeting vector and a Cas9 expression...site destination vectors for inserting a tag at multiple target sites. SapTrap vectors can be easily modified...cells. To use CRISPaint, users need 3 vectors:  1) a gRNA vector that targets the gene of interest, 2)...PCR or cloning, as digestion of the destination vector with SapI yields 2 sites- the first site accepts...screening of the insertion event, and a variety of connector modules (linker sequences between the tag and ...with SapI allows the tag, selectable marker, and connector to be released (Fig. 1, Step 2-3). Since donor...

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

    Type
    Blog Post
    ...are transfected with both vectors. Flex vectors are the solution. Flex vectors expressing fluorescent cytoplasmic.... It became possible to design FLEx vectors (Flip-excision vectors) that only allow one inversion event...concentrations of vectors expressing the required recombinase. The high concentration of FLEx vectors guarantees...experiments. Mutated FRT and loxP sites in Flex Vectors – inversion only once All recombination events ...between target sites of the same sequence in FLEx vectors, the DNA sequence that should be inverted is flanked... target sites are cleaved out, leaving behind a vector with the inverted DNA flanked by non-compatible...non-compatible target sites (Schnütgen et al. 2003). Flex vectors revolutionize neuroscience Manipulation of specific...

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

    Type
    Blog Post
    ...has been exploited to localize factors such as transcriptional activators and repressors to target genes...target genes using dCas9-based activators The simplest of the dCas9 activators consists of dCas9 fused to ... dCas9 and antibody-activator fusion proteins. The Synergistic Activation Mediator complex, generally ...promoter region. Cas9 activators include Cas9 fused to VP64, VP64 along with other SAM factors, and the Suntag...with CRISPR–Cas nucleases, base editors, transposases and prime editors. Nat. Biotechnol. 2020 387 38, ...array of Cas9s (many available through Addgene’s repository) and make it easy to find your perfect match....precise edit without even making a break.  Base editors are dead Cas9 (dCas9) or nCas9 enzymes fused to...

  11. Tips for Using FRET in Your Experiments

    Type
    Blog Post
    ...imaging microscopy (FLIM) method. Acceptor photobleaching method The acceptor photobleaching method is simple...don’t measure acceptor fluorescence, this method is also less sensitive to direct acceptor excitation artifacts...interactions in living cells using a microscope. Historically, molecular interactions were detected by indirect...fluorophore (the donor) to another fluorophore (the acceptor) by means of intermolecular long-range dipole-...dipole-dipole coupling." The emission of the acceptor fluorophore can be measured using microscopy techniques...photons) and the extinction coefficient of the acceptor (linking the quantity of absorbed light, at a ...highest quantum yield donor, the highest absorbing acceptor and fluorophores with significant overlap in their...

  12. Data Freedom: The Expansion of Data Sharing in Research Publications

    Type
    Blog Post
    ...responsible for storage.  If datasets are too large to transfer to a journal repository, they are likely...publishers. Nonetheless, the initial release caused a storm as the organization left open the question of how...for advice about the scope of the policy. End of story? Not quite. The PLOS policy on data access is a...statistical methods, omission of some data, etc.  The firestorm that followed implementation of the policy comprised... with limited acknowledgement of the initial contributors. This is probable to some extent - but that ...tools and assumptions to reveal findings that the originator was oblivious to, no matter how much time they...they had. It could be argued that data generators may, in light of the policy, hold onto data longer before...

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

    Type
    Blog Post
    ... years ago and developed cloning vectors to harness it. These vectors, called pKIL18 and pKIL19, contained.... If, however, an investigator were to successfully clone an insert into the vector, the ccdB reading ...cells that contained non-recombinant vectors (re-ligated empty vectors, for instance) would still express...ccdB makes cloning easier by selecting against vectors that did not take up your insert. But exactly how...ccdB accomplish this? Let’s start with a brief history of the gene and how molecular biologists have harnessed...potent toxin... The ccdB gene, located on the F sex factor plasmid of E. coli, is part of a toxin-antitoxin...from Bernard, P., et al. showing the pKIL 18/19 vectors and demonstrating the concept of restriction enzyme-mediated...

  14. 5 Tips for Troubleshooting Viral Transductions

    Type
    Blog Post
    .... Viral vectors undergo DNA rearrangements. Depending on the composition of the viral vector and the ... researchers prefer to store freshly harvested virus at 4 °C instead of storing it briefly at -80 °C. ...of a recombinant adenoviral vector: optimization of conditions for storage, transport and delivery." Japanese...about Lentiviral Vectors Additional Resources on the Addgene.org Check out Our Viral Vector Guide Pages ...perform complex biological tasks, both of which are factors in the technical challenges they can present. Many... one point or another. After amplifying a viral vector, collecting virus, and transducing target cells...the repeat sequences present in the LTR, the vector may undergo genomic rearrangements during replication...

  15. Experimenting in an Open Source lab: from CRISPR to Cats

    Type
    Blog Post
    ... space is the Victoria Makerspace in Canada, which I belong to. The team at the Victoria Makerspace is..., we intend to focus on motor neuron knockouts so that we can perturb factors related to worm motion. ...student and then instructor at Singularity University at NASA Ames, and an instructor at Biocurious.org...was contributed by Derek Jacoby from Makerspace Victoria, CA Over the decades science has become increasingly... of a bigger movement in a variety of research sectors to provide open source technologies and spaces ... are constantly moving so we need good ways to monitor and track them. We have a number of microscopes...instance, we use a mutant known as CX51 that exhibits motor defects above 25 degrees. Computer scientists and...

  16. Harnessing Bacterial Toxins for Allelic Exchange

    Type
    Blog Post
    ...counterselection vector is the pDS132 sacB-based allelic exchange vector. This vector contains sacB, an...This post was contributed by Jacob Lazarus, a postdoctoral researcher at Harvard. There’s an astounding...selecting for an antibiotic resistance marker from the vector (abR, Figure 1). The resolution step (“double crossover...leads to the desired mutation and excision of the vector backbone. This step requires “counter-selection...colonies isolated are those where the allelic exchange vector has undergone single crossover and integrated into...recombineering (Khetrapal et al., 2015). They created vectors for Lambda Red that contained one of eight bacterial...aeruginosa. These toxins were a mix of Type VI secreted effector toxins, toxin-antitoxin type toxins, and phage...

  17. Thoughts on the Future of Research 2015 Boston Symposium

    Type
    Blog Post
    ... to be nice, the mentor fails to effectively mentor the underrepresented - the mentor over praised and...received a doctoral degree (or equivalent) and is engaged in a temporary and defined period of mentored advanced...to your peers and other mentors who can help you. You Can Talk to Your Editors I wish I had been more...well-meaning mentors often fail to judge the work of underrepresented groups under their mentorship with the...research community to develop a plan to make postdoctoral pay/benefits commensurate with work training...image below). Slide of information gathered by Postdoctoral Associations around Boston - From Panel Session... staff scientists. This results in a glut of postdoctoral trainees who, even though they are aware that...

  18. Typing CRISPR Systems

    Type
    Blog Post
    ...This also means that between two types, the Cas effector may have the same name but be completely different... understand. Classes are based on the main Cas effector; types are based on main function and composition...Class 2. Class 1 CRISPR systems use multi-Cas effectors, referred to as Cascade (CRISPR-associated complex...complexes, while Class 2 use single protein Cas effectors, like Cas9. The Cascade complex doesn’t usually...specific CRISPR type but often recruits the main effector complex after binding to a target. Class 1 is ...the lab. This can be attributed to the multi-Cas effector, Cascade. Developing tools using a Cascade complex...the CRISPR types and is thought to be the common ancestor of all other CRISPR systems. Type III systems ...

  19. Illuminating Choices: A Guide to Selecting Fluorescent Dyes and Ligands

    Type
    Blog Post
    ...Interaction with receptors: Understanding how fluorescent dyes interact with specific receptors is key, especially...especially for G-protein-coupled receptors (GPCRs). Mutations in receptor sites can affect the fluorescence...Throughout their history, fluorescent dyes have enabled the visualization of both organic tissues and... intensity during exposure to light, is another factor to consider. If your application requires longer...fluorescent protein (Mahmoudian et al., n.d.). Factors such as exciting the fluorophore at peak wavelength...It's important to consider how dyes can influence receptor conformation and signaling activity​​ (Sridharan...varying degrees of β-arrestin-2 recruitment to receptors, indicating their agonistic nature. The potency...

  20. Addgene’s Viral Service - Why Virus? Why Now?

    Type
    Blog Post
    ... to all of our generous, sharing depositors. Over 3,000 laboratories are sharing plasmids (with 16 labs...sponsored the capital construction of our new BL2+ laboratory and the infrastructure capabilities to produce...currently sharing viral preps) through the Addgene repository. Without these scientists and the support of ...blessed to have an incredibly supportive Board of Directors at Addgene. Our Board helps keep our focus on ...helping thousands of sharing scientists from laboratories all over the world. With this reach and exposure...new team to push this project forward. The viral vector project team develops methods, performs extensive...generates  educational materials, and provides viral vector technical service (details about virus production...
Showing: 181 - 200 of 1075 results