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We narrowed to 876 results for: tra

Showing: 301 - 320 of 876 results

  1. CRISPRainbow and Genome Visualization

    Type
    Blog Post
    Published
    Feb. 28, 2017, 3:30 p.m.
    ... and recent advances have allowed scientists to track multiple genomic loci over time using all the colors...CRISPRainbow. Figure 1: CRISPRainbow was used to track the localization of 6 chromosome-specific loci in...labeled dCas9 to a given genomic locus, you can track the localization and movement of this locus in live...depositor Stanley Qi and used in Chen et al. to track telomere dynamics throughout the cell cycle. To ...distances from 2-75 Mbp. Labeling multiple, intrachromosomal loci Building on the work of Chen et al., ...turned their attention to mapping pairs of intrachromosomal loci. The technique successfully resolved ... this work represents the first mapping of intrachromosomal loci, a major benchmark in characterizing ...

  2. Hot Plasmids - March 2020 - base editors, GEVI, MoClo, and optogenetics

    Type
    Blog Post
    Published
    March 3, 2020, 2:15 p.m.
    ...the co-transduction by two viruses would lower editing efficiency, the split editors transduced at levels...colleagues evaluated CreLite for cell tracing using the transgenic zebrafish model, ubi:zebrabow. In this...capacity of 4-5 kb limits the delivery of larger transgenes, such as base editors which have a gene size ...base editor is split into two plasmids and co-transfected into cells for reconstitution. Image from Levy...causes Niemann-Pick disease type C, directly demonstrating the therapeutic potential for the split base... of response and brightness. They also do not spectrally separate from green sensors and blue-light-activated...Image from Beck and Gong, 2019. Broadening the spectral diversity of GEVIs can enable resolving single...

  3. Teaching an Old DOG New Tricks: Controlling Protein Activity with GFP

    Type
    Blog Post
    Published
    Nov. 24, 2015, 3:30 p.m.
    ... GFP scaffolds for transcriptional activation The project began with a frustration many researchers have... to create a complete transcription factor, activating luciferase transcription. Tang et al. coined this...Connie Cepko’s lab allow researchers to activate transcription or Cre recombinase activity only in the presence...suddenly seemed very realistic. Envisioning GFP as a substrate promoting dimerization, Tang et al. tested pairs... in their 293 cell culture system. In cells cotransfected with GFP and the GBPs, GFP linked the two GBPs...this system T-DDOG (Transcriptional Devices Dependent On GFP). In testing the specificity of their system... dsRed, mCherry, and TdTomato do not induce transcription. Thus, T-DDOGs can be used in combination with...

  4. Site Directed Mutagenesis by PCR

    Type
    Blog Post
    Published
    Aug. 2, 2016, 2:30 p.m.
    ...competent bacterial strain (e.g. DH5α which is dam+). Methylation deficient bacterial strains can be identified...homology-directed repair (HDR) of a CRISPR/Cas9 induced double-stranded break. This site-directed genome editing requires...methylation-dependent endonuclease (i.e. DpnI), and bacteria are transformed with the nuclease-resistant nicked plasmid (the...products of the PCR reaction are pieces of double stranded, circular DNA with staggered nicks, recent data...final PCR products are pieces of linear, double stranded DNA with homologous ends. These homologous ends... In addition, you may want to try different concentrations of template (e.g. 0.1-1.0 ng/μl). Smaller plasmids...to the PCR reaction (usually around 3% final concentration). The DMSO reduces secondary structures of the...

  5. Design Tips for Prime Editing

    Type
    Blog Post
    Published
    Jan. 23, 2025, 2:15 p.m.
    ...nicking of the unedited strand and encourage the cell to use the edited strand as a template during DNA...on a fusion enzyme of Cas9 nickase + reverse transcriptase and a prime editing guide RNA (pegRNA). The ...) complementary to the genome and a reverse transcriptase (RT) template including the desired edit. ...by the type of edit, genomic context, delivery strategy, cell type, and goal of the experiment. Now, onto...., 2019). Test different lengths of reverse transcriptase template, starting with about 10–16 nucleotides...pegRNA primer binding site (PBS) and reverse transcriptase template (RTT). Created with BioRender.com. ...from re-binding and nicking the newly synthesized strand before heteroduplex resolution, which can lead ...

  6. Lab Automation at Addgene

    Type
    Blog Post
    Published
    March 22, 2018, 1:28 p.m.
    ...bacterial transformation One protocol that has been automated is high throughput transformation. With our...platforms that fit 48 well q- trays allowing us to do up to 96 transformations in one run compared to doing... be useful if you’re transferring samples from 96 wells plates onto agar q-trays where the samples must...easier and more efficient. Here, I’ll discuss transformation, DNA purification, and filling vials with agar...deposits (over 100 deposits per month!), manual transformations were taking a lot of time. Enter the Biomek... We wanted a machine that would improve our transformation protocol and, after looking at a few options...doing about 50 transformations in the same amount of time by hand! Setting up a basic protocol on the...

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

    Type
    Blog Post
    Published
    Nov. 7, 2017, 1:59 p.m.
    ...their mutations corrected, and the T-cells were transferred back into the infants. Almost all patients have...repertoire (1). In this example, it was possible to transduce the T-cells outside the body and thereby correct...techniques may hold the key. In the simplest form, translating gene therapies from conceptual design to clinical...deliver it and identifying a suitable route of administration. However, until recently safe delivery of nucleic...that carries a small, approximately 4.7 kb single stranded genome. AAV belongs to the family Parvoviridae...disease-associated mutations. AAV vectors maintain persistent transgene expression over many years in postmitotic, long-lived...2008. Following a single dose of subretinal administration of rAAV2 carrying the human gene RPE65, patients...

  8. Adapting Toehold Switches to Detect Zika Virus

    Type
    Blog Post
    Published
    Aug. 30, 2016, 2:30 p.m.
    ...and called for the fast-tracked development of diagnostics. Mostly transmitted by Aedes mosquitoes (aegypti...international travel, the Zika virus is expected to expand into heavily populated regions of South, Central, and...between global strains of the Zika virus (Asian-, African- and American-lineages). Strain discrimination...room temperature (Pardee et al, 2014). As a demonstration of the diagnostic potential of these combined... for the detection of antibiotic resistance and strain-specific diagnostics for the Ebola virus. Our original...and electronic companion technologies that has transformed the assay’s capabilities. Specifically this includes... now detects samples at clinically relevant concentrations (1-3 fM; 1x106-fold lower than before), and...

  9. In Living Color: The Skinny on In Vivo Imaging Tools

    Type
    Blog Post
    Published
    March 27, 2014, 5:14 p.m.
    ...electromagnetic spectrum – the spectral region in which mammalian tissues are nearly transparent. As Verkhusha explained...photoacoustic contrast agents for two-color imaging in animals. The approach relies on ultrasound waves as ...tumor. They wanted to find something better. Transparency window That’s exactly what they reported doing...explained it to me, the transparency window of mammalian tissues is set by the properties of hemoglobin ...corals, but all of them fluoresce outside the transparency window of mammalian tissues,” Verkhusha said...near-infrared fluorescent proteins within this transparency window, so now, we could see deeper.” Adding...Communications last year, “The capability to control spectral properties of PA FPs with light of specific wavelength...

  10. SunTag and Fluorescent Imaging

    Type
    Blog Post
    Published
    March 28, 2017, 2:30 p.m.
    ...better. More transcription factor binding sites in a promoter lead to higher transcriptional activation....Fluorescent protein fusions One of the easiest ways to track a given protein is to fuse it to a fluorescent protein... present when the protein is at a very high concentration. Overexpressed proteins also have the potential...fluorescent signal and enables single molecule tracking  within living cells without affecting protein...thereby creating a single-molecule reporter of intracellular processes. Initially, Tanenbaum et al. observed...molecules very effectively - they even managed to track run lengths of the motor protein kinesin across ...cell physiology. Having seen that mitochondrial tracker GFP-mitoNEET can impair mitochondrial function,...

  11. CRISPR 101: Cas9 Nickase Design and Homology Directed Repair

    Type
    Blog Post
    Published
    March 15, 2018, 12:59 p.m.
    ...nickase. Nickases create a single-strand rather than a double-strand break, and when used with two adjacent...the target strand. Conversely, the H840A mutation in the HNH domain creates a non-target strand-cleaving... how IDT (Integrated DNA Technologies) first demonstrated how CRISPR nickases improve homology directed...strand-cleaving nickase. Instead of cutting both strands bluntly with WT Cas9 and one gRNA, you can create a staggered...to each other? The gRNAs must target different strands to create a DSB, but this can be accomplished with...experiment to insert an EcoRI site using a single-stranded oligonucleotide (ssODN) donor. Using a D10A nickase...across the 51 nt region using either a top or bottom strand ssODN donor with 40 bp homology arms. The HDR efficiency...

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

    Type
    Blog Post
    Published
    Oct. 11, 2018, 12:30 p.m.
    ...number of transformants); the greater the number of inserts, the lower the number of transformants. To compensate...containing the transformants onto the selection plate. Figure 2 shows representative transformation plates obtained...cassette, and illustrates how the volume of the 1 ml outgrowth spread on each transformation plate can be...prefers ligation of Watson-Crick base pair substrates, it demonstrates significant activity on some mismatch-containing...the number of transformants while maintaining high levels of correct assemblies) translate to faster assembly...experimentally-derived DNA Ligase fidelity data. Our work demonstrates that it is now possible to achieve 20+ fragment...background by antibiotic selection. Screening of transformants by colony PCR confirmed the insertion of the...

  13. Is this the right place for me? 8 tactics for choosing a lab

    Type
    Blog Post
    Published
    Oct. 2, 2018, 12:56 p.m.
    ...character traits and skills that you hope to grow.  Find mentors who take their responsibility to train you ...decisions without much logic - even choosing a training lab where we will spend the next 6 years. Know...about this lab’s reputation? If you are choosing a training lab, I strongly suggest you complete a work rotation... also be a sign that the lab head has trouble attracting scientists. To get a better idea of why the lab... head is an absentee advisor. They are always traveling, or too busy to interact regularly with the newer...happened to her a year later. I hear too many science trainees get warnings and still think “but that won’t happen...follow the academic career path taken by their training lab mentors. ~80% of you will be in jobs outside...

  14. Recombinase-based State Machines Enable Order-dependent Logic in vivo

    Type
    Blog Post
    Published
    July 28, 2016, 2:30 p.m.
    ...state machines in living cells” (1), into a more straight-forward, concise explanation of how to adapt our...between them (Fig. 1A below). In the absence of extra recombinase-specific co-factors (which should be... what order they were added. Figure 1D below demonstrates an example of a register that enters distinct...might one read the state of an RSM? The most straightforward way to read the state of an RSM is to sequence...sent the PCR product for sequencing.  A less straightforward, but more population-wide (as opposed to single-cell...our paper. In our opinion, the most convenient strategy is the fluorescent reporter based method since...promoters: the BxbI gene downstream of the anhydrotetracycline (ATc)-inducible promoter (PLtetO), the TP901...

  15. A New Optogenetic Tool Based on AraC Controls Gene Expression with Blue Light

    Type
    Blog Post
    Published
    June 17, 2021, 1:17 p.m.
    ...ETH Zürich. “Instead of a graphical abstract, it’s a musical abstract,” says Di Ventura, a professor at ...from one that represses transcription to one that activates transcription.However, this system lacks spatio-temporal...create these images, the scientists used a strain transformed with pBLADE expressing superfolder GFP instead...barbara_synbio) May 13, 2021 The original AraC transcriptional regulator Their system is based on the AraC...AraC protein that controls transcription from the PBAD promoter. “AraC is widely used in synthetic biology...It relies on the sugar arabinose to activate transcription by causing conformation changes in the AraC ...domains of the BLADE dimerize and activates transcription. The team created two constructs, among others...

  16. CRISPR 101: Making a Knock-In Cell Line

    Type
    Blog Post
    Published
    Dec. 22, 2022, 2:15 p.m.
    ...(single vs. double stranded) all depends on the size of the knock-in. Single strand oligonucleotide donors...Taking the road less traveled and generating a knock-in cell line instead of a knock-out? We’ve got you...knock-out. The goal of a knock-out is to disrupt DNA translation by generating a frameshift mutation. The majority...pathway cells already have for repairing DNA double strand breaks – (HR). HR is the dominant homology-directed... Fig. 1: Early steps in repair of a DNA double strand break by homologous recombination.    Designing...synthesis limits of oligonucleotides. These donors traditionally have larger homology arms in the 500 bp to 1... 1 kb range, however, shorter homology tracts have recently been used with some success (Yu et al., Nat...

  17. CRISPR Antimicrobials

    Type
    Blog Post
    Published
    May 3, 2016, 2:30 p.m.
    ... CRISPR over traditional antibiotics The potential advantages of CRISPR over traditional antibiotics are... years after introduction. Current antibiotic strategies are nonspecific - they harm any bacterial cell...beneficial flora. Currently, there is no antibiotic strategy available to target only virulent or antibiotic... joining machinery, so a CRISPR-induced double-stranded break (DSB) in the genome is lethal. If this DSB...treatment were sufficient to wipe out the virulent strain. Bacteria not killed by the first round of treatment...just 24 hours.   Figure 1: Single-phage strategies for bacterial CRISPR targeting. Phage-derived...would be needed for an in vivo therapy. Another strategy for CRISPR antimicrobials combines them with both...

  18. New Neuroscience Tool: The iGluSnFR3 Glutamate Sensor

    Type
    Blog Post
    Published
    April 7, 2022, 1:15 p.m.
    ...kinetics which are illustrated in figures 2 and 3.  Figure 2: Glutamate titration curves for the ... glutamate neurotransmission.” Nature Methods (2013) PubMed PMID: 23314171. PubMed Central PMCID: PMC4469972...accurately differentiating between synaptic vs. extrasynaptic glutamate release. Building on the previous ..., GPI, and SGZ, to improve neuronal membrane trafficking and localization. Improved photophysical properties... Figure 1: 1P and 2P excitation and emission spectra of SF-Venus-iGluSnFR.A184V, iGluSnFR3 v82, and ...Supplementary Figure 3.   Figure 3: pH titration curves and ∆F/F0 for the different iGluSnFR variants...al…, Supplementary Figure 2.   Improved trafficking and localization through different C-terminal...

  19. Quantifying DNA? Here are Five DNA Quantification Methods to Consider

    Type
    Blog Post
    Published
    July 21, 2020, 1:15 p.m.
    ... the absorbance/transmission of light through a liquid to determine the concentration of substances in...ladder with known concentrations. Many commercial DNA ladders will tell you the concentration of each band ...spectrophotometer measures these absorbances using UV-transparent cuvettes. First you measure the absorbance of...absorbance measures give you an idea of the concentration of your DNA prep and whether there are any other...the A260 reading, you can calculate the DNA concentration. Generally, A260 of 1.0 is equivalent to 50 ...the following formula to estimate your DNA: Concentration (ug/ml) = A260 reading x dilution factor x 50...However, there’s limited sensitivity at low concentrations of DNA and it can’t distinguish between DNA...

  20. K. phaffii: Rising to the Occasion

    Type
    Blog Post
    Published
    April 4, 2023, 1 p.m.
    ...methanol from the media. This feature makes the strain tractable for peroxisomal studies on biogenesis, degradation...affordable, and it grows fast to boot. The yeast strains S. cerevisiae and S. pombe have dominated the research... blog we will review an alternative model yeast strain and discuss why you may want to consider a yeast... between two of the most frequently used yeast strains: S. pombe (fission) and S. cerevisiae (budding)... to its fermentation abilities and other useful traits. The “biotech yeast” You’re probably wondering...differences between K. phaffii and other yeast strains.     S. cerevisiae S. pombe K. phaffii...and bears more similarity to the ancient yeast strains and metazoan cells.   Applications for K. phaffii...
Showing: 301 - 320 of 876 results