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We narrowed to 974 results for: LAT

Showing: 181 - 200 of 974 results

  1. Easi-CRISPR: Generating Knock-In and Conditional Mouse Models

    Type
    Blog Post
    ... Single-stranded DNA repair templates Short single-stranded DNA templates have been shown to improve the...final ssDNA template. Figure 2: Overview of ivTRT to generate an ssDNA repair template. Although...laboratory mouse. It’s also made targeted insertions relatively simple in C. elegans and bacteria. But CRISPRing...from low efficiency when a standard dsDNA repair template is used. The original design for creating a conditional...targeting two intronic regions and two repair templates in order to insert two loxP sites. Since two double-strand...ameliorate this problem. Briefly, you design your donor template to include a T7 promoter upstream of the left ...vitro transcription, and use the IVT product as a template for reverse transcription to create your ssDNA...

  2. RNA Extraction Without A Kit

    Type
    Blog Post
    ...As with DNA isolation, scientists commonly rely on RNA isolation kits to make their life easier. Recently... out. In this article, we cover the basics of isolating RNA without a kit. Tips for working with RNA (... today There are many alternative methods for isolating DNA without a kit. However, that isn’t the case...method. A major hurdle to developing protocols to isolate RNA was that RNases are commonly found in cells...upon cell lysis, RNA is degraded. To effectively isolate intact RNA, a fast, strong protein denaturant would...chance to break down RNA upon cell lysis.  In the late 1970’s, Chirgwin and colleagues showed that a strong...., 1979). They developed a protocol meant for isolating RNA from rat spleens in which they homogenized...

  3. Antibodies 101: ELISA (Enzyme-linked Immunosorbent Assay)

    Type
    Blog Post
    ...detect proteins within a 96- or 384-well, flat-bottomed plate. The basic principle of an ELISA is that ...technique works by first coating the wells of a flat bottomed plate with a capture antibody that is specific ...experimental sample are bound to the wells of a plate instead of an antibody. Coating the wells with a...characterize antibodies against the antigen bound to the plate. Figure 3: Overview of using Direct ELISA...protein antigen is coated onto the wells of the plate. However, instead of detecting your protein using...absorbance of each well, which is measured using a microplate reader, is directly proportional to the amount... of enzyme present in the well and is used to calculate the amount of your protein of interest that is...

  4. Plasmids 101: Protein Expression

    Type
    Blog Post
    ...formation of disulfide bridges, glycosylation and acetylation to create functional, stable proteins. Protein...used to manipulate DNA), or in medicine (e.g. insulin). Proteins, unlike DNA which can be relatively easily...cells with your DNA template of choice and allowing these cells to transcribe, translate and modify your ...transcribed into messenger RNA (mRNA). mRNA can then be translated at the ribosome into polypeptide chains that ...proteins are then modified via an array of post-translational modifications including protein folding, formation...proteins from mRNA and the addition of post-translational modifications Learn more molecular biology ...mammalian proteins that require multiple post-translation modifications for proper protein function. Most...

  5. Multiplexed Capture of Promoter-enhancer 3D Chromatin Structures Using CRISPR

    Type
    Blog Post
    ... the biotinalatable tag on dCas9 with a BioTAP-tag. The BioTAP-tag is a 69 aa long biotinylation targeting...Jul 2, 2020. Promoters may be the star of gene regulation, but enhancers and chromatin looping play important...important supporting roles. Enhancers are cis regulatory DNA sequences that, when bound by transcription...thousands of base pairs away from the gene they regulate, but are brought in proximity by the looping of...CAPTURE (CRISPR Affinity Purification in situ of Regulatory Elements) method. The original CAPTURE method...2020). CRISPR Affinity Purification in situ of Regulatory Elements: The original CAPTURE method The original...the dCas9 to the loci of interest and dCas9 is biotinylated by BirA. From here, the CAPTURE method is similar...

  6. A Primer on Optogenetics: Introduction and Opsin Delivery

    Type
    Blog Post
    ...antibody manipulation), then expression is likely sufficient for successful optical stimulation.  It is...Gore BB, et al. Manipulating gene expression in projection-specific neuronal populations using combinatorial...technique is remarkably straightforward to learn and relatively cheap (compared to many other technologies and...electrophysiology to prove that your optogenetic manipulations are generating action potentials (or lack there...assess the effectiveness of your optogenetic manipulations (though a reviewer will probably ask for electrophysiology...circuit of interest in promoting reward is a self-stimulation experiment wherein mouse initiated optogenetic...in a reward sensation and subsequent repeated stimulation. A spatial memory task, on the other hand, would...

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

    Type
    Blog Post
    ...possible to build gene regulatory RSMs (GRSMs, the subset of RSMs that regulate gene expression) that ...massive amount of information regarding which regulatory proteins, signaling molecules, mutations, and...individual bacterial cells to form colonies on a plate and then we performed colony PCR on the register...sequencing.  A less straightforward, but more population-wide (as opposed to single-cell) approach is ...a particular application makes it difficult to isolate single registers or if it requires reading so many...necessarily have to be based on transcriptional regulation, as long as they can control recombinase activity...post-transcriptional recombinase activation via RNA toehold riboregulation could be a promising strategy for linking RSM...

  8. Plasmids 101: Codon usage bias

    Type
    Blog Post
    ...example Tuller et al. found that translation efficiency is well correlated with codon bias in both E. coli...therefore may need fewer resources for the entire translation process. For example, during high growth rate...rate conditions, E. coli preferentially upregulates production of tRNAs that recognize codons found in highly...tRNAs, different regions of the protein may be translated at different rates. The ribosome will move quickly...the ribosome stalls, this may give the swiftly translated regions a chance to fold properly. For example...with specific secondary structures in 10 closely related yeast strains. Adaptation to changing conditions...codon preferences online). Even if the gene is translated, it may not function properly. This is the result...

  9. Deciphering the Mysteries of Behavior with Viral Vectors

    Type
    Blog Post
    ...an shRNA to downregulate expression of miR124a, a regulatory RNA that negatively regulates BDNF levels...Christian Lüscher. "Refining deep brain stimulation to emulate optogenetic treatment of synaptic pathology...their involvement is activating, inhibiting, or modulating. Viral vectors, in contrast, are considerably...considerably more versatile and specific in how they manipulate neuronal function, with far fewer side effects compared...animal has been exposed to morphine or other stimulating drugs, it develops an enhanced propensity for...connection between neuroinflammation and anxiety by modulating the production of the pro-inflammatory cytokine..., or passive floating on the water surface. The latter reflects a state of behavioral despair, and the...

  10. Antibodies 101: Flow Cytometry Controls

    Type
    Blog Post
    ...differentiate the Ly6C negative population from the Ly6C positive population. Figure 2: An FMO gating...clear positive and negative population. If you’re unsure what your population will look like for a particular...Markers that define more specific cell populations, often used in the later gates, are more likely to require...or isotype controls, which we’ll describe a bit later. Single Colors Single color controls contain, as...artificial positive (bound) and negative (unbound) population. The benefit of beads is that they do not require...allows you to more easily and accurately gate populations that may otherwise be difficult to separate out...commonly used markers that define broader cell populations (e.g., CD4, CD8b, CD11b, CD19), are less likely...

  11. Measuring Kinase Activity at the Single-Cell Level with Kinase Translocation Reporters (KTRs)

    Type
    Blog Post
    ...Kinases: they regulate many proteins, with ~1/3 of human proteins predicted to be phosphorylated on at least...least one site. Phosphorylation is particularly important for regulating signal transduction and measuring...predict. Slower Dephosphorylation Rates: FRET-based reporters can have slower dephosphorylation rates than ... signal (NES), both which are phosphorylatable. Prior to phosphorylation, the KTR localizes to the nucleus... of the nucleus depending on its phosphorylation status. The relative ratio of cytoplasmic vs. nuclear...hypothesized to be caused by FRET reporters having phosphorylated conformations that are less phosphatase-accessible...nucleus, but following phosphorylation bNLS activity is suppressed and NES activity is enhanced, leading...

  12. Targeting HIV-1 with CRISPR: Shock and Kill or Cut it Out?

    Type
    Blog Post
    ... constructs. In multiple HIV-1 latent T cell lines, as well as a latent microglial line, treatment with...doesn’t completely disappear; it just hides in latently infected cells. To truly cure HIV-1, researchers... levels due to the viral reservoirs located in latently infected cells. Although ART-treated patients ...disease. This increased disease risk is attributed to latent HIV reservoirs, chronic inflammation, and negative...doesn’t see any threat to which it should respond. Latently infected cells evade immune detection because ...first, “shock and kill”, aims to reactivate the latent HIV so that infected cells will produce viral proteins...joined together. Clonal Cas9/gRNA-expressing cell populations were also immune to HIV-1 reinfection. Importantly...

  13. Split-BioID: An Improved Method for Studying Protein-Protein Interactions

    Type
    Blog Post
    ... are enriched relative to controls using Split-BioID-GFP and BioID run on six unrelated proteins. One ...These interactions are often modeled as binary relationships, i.e. protein A interacts with protein B; but...controllable version of the proximity-dependent biotinylation technique BioID. The key advantage of Split-...BioID, BirA* is fused to a bait protein and it biotinylates proteins that are within a ~10 nm radius of ...biotin. When proteins Y and Z part ways, BirA* biotinylation activity ceases. After biotin tagging of proteins... PPIs are identified via mass spec analysis. Biotinylated proteins are considered possible interaction...different levels of fusion protein expression and biotinylation depending on which terminus of the bait proteins...

  14. CRISPR Methods for Bacteria: Genome Engineering, CRISPRa, CRISPRi, Base Editing, and More

    Type
    Blog Post
    ...promoter or the coding sequence and the template or non-template strand, among other parameters. .  Stanley...introduced along with an oligonucleotide repair template. Through recombineering, the locus of interest...interest is modified to match the repair template, and the locus cannot be recognized by the spacer-derived ... contains the specific gRNA(s), and the repair template is supplied as a dsDNA fragment. Each round of...with XbaI to insert extra elements, like a repair template, using Gibson Assembly or restriction enzyme cloning...does not function in bacteria, most efforts to regulate gene expression were limited to inducible promoters...CRISPR offers a much more user-friendly way to modulate gene expression. The Marraffini lab and Qi lab...

  15. Antibody Validation for Flow Cytometry

    Type
    Blog Post
    ...relying on correlations between actual antibody labeling and expected labeling. Correlation cannot prove...practice to combine correlation with other approaches when possible. Finally, correlation of -omics data ...a powerful tool to delineate cell populations and to study relative protein expression. Its reliability...against markers of the human blood leukocyte populations, as well as a pragmatic approach to determining...and the abundance of the epitope in the sample, relative to cross-reactive antigens – that is, an antibody...images showing the staining intensity in the KO population (pink histogram) compared to the WT cells (green...shows separation between the wild-type and the KO population (Figure 1), further optimization can be performed...

  16. 3 Tips to Improve HDR Efficiency for CRISPR Editing in Human Cells

    Type
    Blog Post
    ...the blocking-only templates will compete with the blocking/intended mutation templates resulting in cells...simultaneously introducing a homologous DNA repair template, such as a sin­gle-stranded oligodeoxynucleotide...In mammalian cells such as stem cells, HDR is relatively rare and DSBs are predominantly repaired by NHEJ... very excited to set up a CRISPR-based editing platform in our lab. Our goal was to use the system to ... – Edit the cells a second time using a repair template that corrects the blocking mutation and again ...that the cell was only using a part of the repair template and mutations further away from the cut site were...characterize this phenomenon and found a general relationship between the distance of a mutation from the ...

  17. Deep Mutational Scanning with One Pot Saturation Mutagenesis

    Type
    Blog Post
    ...the template. The opposite is true if the sense strand is nicked for template formation: template will...low primer-to-template ratio is used to promote annealing of one primer to each template. The PCR product...Error-prone PCR: This method amplifies the wild-type template with a “sloppy” version of PCR that results in...). It uses a uracil labeled wild-type ssDNA as template for a site-directed mutagenesis PCR that uses ...strand (step 2 and 3). Then the uracil-labeled template strand is degraded by uracil DNA glycosylase (...present on both strands of the plasmid. The ssDNA template is generated by transforming a backbone phagemid...days to generate the phage-derived uracil labeled template, this method requires further DNA shuffling to...

  18. Plasmids 101: In-house NGS Plasmid Quality Control Now at Addgene

    Type
    Blog Post
    ... our high-throughput DNA isolation process that yields high-quality isolated DNA samples of sufficient...process is completed in a plate format yielding anywhere from two to six plates of 96 samples per week. ...anyone who has ever worked to sequence DNA on NGS platforms will tell you, while the process has become much... process only takes about one day, even for six plates (576 individual plasmids)! These libraries are ...perform Picogreen quantification on each and every isolated plasmid sample and normalize each to fall within...of this range are “failed” and removed from the plate to be prepped again. These holes are then filled...mutations, we check to see if they affect the translated amino acid. We also confirm that the species ...

  19. Three Key Considerations for Precise Neuronal Targeting Using AAV Technologies

    Type
    Blog Post
    ...multicistronic vectors, and post-translational regulatory elements. Examples of these approaches are given...regions, neuronal networks, and specific neuronal populations to consider. To tease apart how different neurons...can combine classical genetic tools with the manipulation of specific neuronal subtypes and determine ...combinations to choose from for your experiments! Late last year, we hosted our first AAV Education and...-based molecular tools for targeted neuronal manipulation. The goal of the workshop was to share the results...for neuroscience see Table 1 from the paper. 2. Manipulate your cell of interest: Cell-type specific expression...achieved in nontransgenic animals by using cis regulatory elements such as promoters and enhancers, multicistronic...

  20. Deep Dive: qPCR

    Type
    Blog Post
    ... precision for relative quantification. A consistent 5% positive error across the plate is fine; a 5% ...up your plate in a way that will tell you if you have pipetting errors on the edges of the plate. Compare...variation due to technical error.  Plate readouts can be affected by plate type or tubes, sealing method, ...of mouse prominin, is blood glucose-regulated and can up-regulate the expression of GAPDH. Biochem Biophys...You know qPCR is most commonly used to measure relative quantification of mRNA, which can be used as a...reported to work well in the Lightcycler while being relatively easy to multiplex (Thellwell, 2000). See Table...possible to multiplex your reference genes to save on plate space. For many cell lines and tissue types, appropriate...
Showing: 181 - 200 of 974 results