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We narrowed to 846 results for: tat

Showing: 141 - 160 of 846 results

  1. Antibodies 101: Designing Your First Flow Panel

    Type
    Blog Post
    ...within atoms to a higher energy state. This process is called excitation. After a short period, the electrons...lower energy state, whereby a photon is emitted. This step is called emission. During excitation, some of ...speak of excitation and emission spectra. Both spectra possess clear maxima where excitation and emission... to the global maximum of PE's excitation spectrum where the excitation efficiency is much greater. As...signal.   Figure 2: Excitation and emission spectra for PE. The excitation spectrum shows two maxima...While APC's global excitation maximum lies around 650 nm, APC-Cy7's global excitation maximum is about ... Figure 3: Excitation and emission spectra for APC and APC-Cy7. While the excitation spectra of both...

  2. Targeted Mutagenesis with EvolvR

    Type
    Blog Post
    ...culture, so bacteria must be grown in a turbidostat. Only mutate particular types of nucleotides. Both...rate was 2.5 x 10-6 mutations per nucleotide per generation vs. 10 x 10-10 mutations per nucleotide per...increase the mutation rate and extend the editing window of EvolvR: (1) two additional mutations to PolI3M...many known spectinomycin resistance mutations, several new mutations were identified by targeting EvolvR...to generate specific mutations in your plasmids Use REPLACER Mutagenesis to mutate your plasmid Resources... sequence can help scientists identify and/or facilitate the evolution of new phenotypes, and forward ...bacterial growth conditions in order to maximize the mutation rate. For example the Phage Assisted Continuous...

  3. Screening for Successful Genome Editing with Digital PCR

    Type
    Blog Post
    ...Surveyor® or T7E1) for mutation detection. While these methods paved the way for mutation validation, we found...individual target molecules based on their mutation status. The drop-off probe is designed to perfectly...and is not capable of binding a mutated target. The amount of both mutated and wild type target in each ...samples with mono-allelic mutations versus those with the bi-allelic mutations typically desired when screening... comes time to (hopefully) validate successful mutation of your favourite gene, there are several different... to help guide you through the rough waters of mutation validation, such as this "CRISPR 101" post. Next-generation...Since there are many thousands of partitions, statistical modelling can be used to determine the actual...

  4. Choosing the B(right)est Fluorescent Protein: Photostability

    Type
    Blog Post
    ...fluorophore primarily depends on the excitation power and the excitation wavelength. A fluorophore is less...absorb the excitation light less efficiently. Similarly, decreasing the power of the excitation light reduces...acquired at low excitation powers. Note, however, that, at a 14-fold higher excitation power, the photostability...lightbulb or exchanging excitation filters). This avoids substantial changes in excitation power and will help...reduces the number of excitation/emission cycles per unit of time, decreasing the likelihood that a fluorophore...story. The photobleaching rate does not depend on excitation power in a linear fashion. This implies that ...Cranfill et al, 2016). This non-linear dependence on excitation power is important since different fluorescence...

  5. CRISPR Guide

    Type
    Guide
    ...developed by mutating specific amino acid residues to reduce off-target editing. Some mutations disrupt interactions...off-target mutations in DNA, RNA, or both, and are recommended in contexts where such mutations would be...target DNA. Once the Cas9-gRNA complex binds a putative DNA target, the seed sequence (8–10 bases at the... and a gRNA will result in a diverse array of mutations (see: Validate genetic modification ). In most...amino acid deletions, insertions, or frameshift mutations leading to premature stop codons within the open...targeted gene. The ideal result is a loss-of-function mutation within the targeted gene. However, the strength...Catalytically inactive “dead” Cas9 (dCas9) contains mutations in both nuclease domains, D10A and H840A, resulting...

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

    Type
    Blog Post
    ... electrons are elevated from a ground state to an excited state through the absorption of photons. After... elevation in this excited state, the electron returns to its ground state by emitting a photon with slightly...10nm) and overlap of excitation profiles is vital for the accurate interpretation of FRET-based experiments... or the difference in wavelength between peak excitation spectrum and emission spectrum. Fluorescent dyes...chemical structure, leading to differences in their excitation and emission wavelengths, which are pivotal in...dye is fluorescein isothiocyanate (FITC), with excitation/emission peak at 495/517 nm. FITC binds to an...this include coupling to an antibody, whereby excitation of blue light will indicate where FITC is bound...

  7. Plasmids 101: FLEx Vectors

    Type
    Blog Post
    ... same orientation, the SSR will excise the DNA fragment. By manipulating the number, orientation, and ...the sense orientation, followed by the mCherry coding sequence in the antisense orientation (Figure 1,...Introduction of a conditional point mutation or functional mutation in vivo: Similar to a conditional rescue...-specific recombination events, and that the orientation of the flanking loxP sites directs the Cre recombinase...recombination. The FLEx switch takes advantage of the orientation specificity of the site-specific recombinases...flanked by target sites (floxed) in opposing orientations, a SSR will invert the DNA sequence between ...wild-type pair (loxP, black arrowheads) and one mutated pair (for example- lox511, white arrowheads). It...

  8. Which Fluorescence Microscopy Technique is Best for Me?

    Type
    Blog Post
    ...metal disk containing a number of holes rotates through the excitation light path. Each hole corresponds to...traditional confocal due to limitations in light penetration mentioned above (5). Thick static samples Ex: Fixed...detector or restricting fluorescence to specific excitation volumes to enhance spatial contrast (i.e. optical...microscopy. Collimated (non-converging or diverging) excitation light exits the microscope objective evenly illuminating... CT scanner. This is accomplished by focusing excitation light to a point in the sample and raster scanning...First, widefield and confocal microscopy project excitation light through the entire axial volume of a sample...signal intensity. 2-Photon microscopes restrict excitation (and bleaching) to a single focal point. This...

  9. REPLACR Mutagenesis: Replacing In Vitro Recombination Methods

    Type
    Blog Post
    ...Types of Mutations Insertions, deletions, point mutations Insertions, deletions, point mutations Insertions...inactivating/activating mutations. In biomedical research, modeling patient mutations using SDM can help determine... make a point mutation, you design two oligonucleotide primers with the desired mutation, then use those...Insertions, deletions, point mutations Insertions, deletions, point mutations PCR Reactions 1 1 1 per fragment...commercial kits are available for making small point mutations, large deletions/insertions require complicated...PCR amplify the template plasmid. The parental, nonmutated DNA is digested with methylated DNA-specific ...express phage recombination machinery, which facilitates easy genetic modification by homologous recombination...

  10. Plasmids 101: Common Lab E. coli Strains

    Type
    Blog Post
    ...uptake, iron uptake receptor mutation. T1/T5 Phage resistance gal Mutation in galactose metabolism pathway...DNA, preparing unmethylated DNA, and more. Many mutations that make these features possible are present ...present in most commercial strains, especially mutations that make major improvements such as those that increase...found in E. coli strains. Table 1: Common gene mutations found in E.coli strains Gene(s) Description...Functional Consequence dam DNA adenine methylase mutation (GATC) Preparing unmethylated DNA, important when...ex: ClaI or XbaI) dcm DNA cytosine methylase mutation (CCWGG) Preparing unmethylated DNA, important ...enzymes that are methylation sensitive. dnaJ Mutation in a chaperonin gene Increases the stability of...

  11. Optogenetics Guide

    Type
    Guide
    ...improve these natural opsins - by inducing point mutations to alter the absorption spectrum or adding trafficking...physiological pH and trafficks well to the membrane. Excitatory (Depolarizing) ChR Variants. The optogenetic ... variants have been created via genetic point mutations, codon optimization, and chimeric fusion of domains... as light-gated, cation channels resulting in excitation (depolarization) of the neuron. Feature enhancements...photocurrent compared to CrChR2 450 ChETA E123T mutation; creates faster kinetics but reduces photocurrent...photocurrent amplitude 490 ChR/T159C T159C mutation; displays increased photocurrents 470 SFO/SSFO Step function...function Opsins and Stabilized Step Function Opsins. Mutations at C128 and D156 of CrChR delay the closing of...

  12. Fluorescent Proteins 101: Green Fluorescent Protein (GFP)

    Type
    Blog Post
    ...wildtype protein and facilitating its widespread use in research. Many other mutations have since been introduced... and their mutations relative to wildtype GFP. Although not listed here, many permutations within each... and the mutation definitions found in Table 2 may not apply. Table 1: The specific mutations comprising...2: Functional role of specific mutations in GFP derivatives Mutation Known Function S65T Increased...little truncation is tolerated, however, point mutations are acceptable. GFP's main advantage over conventional...In 1995, Roger Y. Tsien described an S65T point mutation that increased the fluorescence intensity and ...photostability of GFP. This also shifted its major excitation peak from 395 nm to 488 nm, effectively ameliorating...

  13. CRISPR/Cas9 FAQs Answered!

    Type
    Blog Post
    ...span the knock-in gene. For making mutations, one good way is to mutate the PAM 'NGG' sequence in the HR...silent mutation. Q9: When attempting to use the CRISPR/Cas9 system to create specific mutations or insertions...possible. For introducing small mutations (<50 bp) or a single-point mutation, the best HR template for transfection...the introduction of a mutation into the genome, how can cells with that mutation be selected/screened?...on each side flanking your desired insertion or mutation. Each arm is around 800 bp. For transfection in...the HR template, you usually would need to make mutations of the HR template to avoid this donor plasmid...being degraded by Cas9 in cells. One good way is to mutate the PAM 'NGG' in the HR template, like change it...

  14. Mouse Modeling, Part 2: Breeding and Crossing Mice

    Type
    Blog Post
    ...commonly used to introduce multiple mutations. This is because as more mutations are introduced into a single...arise when crossing mice with multiple mutations is if the mutations are on the same chromosome. Homologous...engineering should be used to separately introduce each mutation independently into different mice, and then these...production of offspring that have a combination of the mutations engineered into each of their parents. Here’s ...mice that are each homozygous for one of the two mutations that you want combined in your offspring. Genotyping...producing mice with your desired combination of mutations. Assuming your parental mice were all homozygous... to a mouse that is homozygous for a different mutation, the F1 offspring will be either hemizygous or...

  15. Plasmids 101: Colony PCR

    Type
    Blog Post
    ... about the orientation of the insert Orientation-Specific Tells you the orientation of the insert... provide information about the orientation of the insert. Orientation-specific primers: If you need ...information about insert orientation, then you might consider designing orientation-specific primers. Blunt...primers, 2) backbone-specific primers, and 3) orientation-specific primers.       Insert-specific primers...insert is present but not if it’s in the correct orientation or even if it’s in your plasmid backbone. Backbone-specific...an example of when you might want to know the orientation of the insert. One member of this type of primer...or no" test results Doesn't tell you the orientation of your insert or if the insert is in your plasmid...

  16. An “elegans” Approach to Better CRISPR/Cas9 Editing Efficiency

    Type
    Blog Post
    ...dominant mutation, known as co-conversion (Arribere et al., 2014). In both cases, the selected mutation must...repair of a lethal mutation should remove much of the unedited “haystack”, facilitating recovery of edited... of lethal mutation co-selection. Only animals rescued for the conditional lethal mutation survive the...determined optimal PAM orientation for editing using two Cas9 targets. An orientation where the 5’ ends of...Cas9 allows us to delete sequences and introduce mutations and epitopes with unprecedented ease. These new... homozygous, outcrossed knock-in ready for experimentation. In 2014, several manuscripts published in ...approach relying on repair of a conditional-lethal mutation to identify edits with minimal screening effort...

  17. Treating Muscular Dystrophy with CRISPR Gene Editing

    Type
    Blog Post
    ...models with mutations in human-relevant exons 45-55, rather than in the traditional exon 23-mutated mouse model... genetic diseases, the mutational landscape is broad and varied, necessitating the development of many...modification, to repair or add in disease-causing mutations, but, until recently it hadn’t been used to treat... males. DMD is caused primarily by frameshift mutations in dystrophin, a protein essential for proper ...sequence appears to be nonessential. Within the mutational hotspot for dystrophin, exons 45-55, there are...partially functional protein. Individuals with these mutations are often asymptomatic, or have only mild symptoms... oligonucleotide exon skipping (OEN) to remove mutated exons from the dystrophin transcript. Unfortunately...

  18. CrispyCrunch: High-throughput Design and Analysis of CRISPR+HDR Experiments

    Type
    Blog Post
    ...Optimal mutation in-depth One the most sophisticated features of CrispyCrunch is how it mutates guide sequences...region, the mutation may cause side-effects. Further, work by John Doench et al. shows that mutating a single... After each mutation, it will check the CFD score. If it is below 0.03, it stops mutating. (Note: the ... example, it ranks guides by CFD score, and it mutates HDR donor templates to avoid re-cutting when needed...for TagIn. HDR requires the additional step of mutating guide sequences in a way that prevents re-cutting...do it best. Scientists are typically advised to mutate the PAM to which the guide binds. However, if the...implemented the following algorithm for optimal mutation in CrispyCrunch: If the guide PAM resides outside...

  19. Using CRISPR/Cas9 to Edit Disease Out of the Genome

    Type
    Blog Post
    ...developing anti-CRISPR proteins aid the limitation of these mutations, to control the CRISPR system activity...could be used to edit several autosomal-dominant mutations that have been connected to the early onset of... CRISPR/Cas9 corrects Alzheimer’s disease mutation in basal forebrain cholinergic neurons derived...Academy of Sciences found that mice with a dominant mutation in a gene that causes cataracts could be rescued...demonstration of use of genome editing to correct point mutations in two diseases with real phenotypic effect.” ...noted that CRISPR/Cas9 has been used to generate mutations in a wide range of organisms, but its potential...phase of crisis where they 'collect' a number of mutations.” Cystic fibrosis may not be the most likely candidate...

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

    Type
    Blog Post
    ...inappropriate statistical methods, omission of some data, etc.  The firestorm that followed implementation of the...condensed into a statistically evaluated set of values.  However, to evaluate the interpretation of the experiment...Instead, selected images are said to be representative or the statistical variation is calculated and placed...overnight revelation, rather it was the result of consultations between researchers and publishers. Nonetheless.... The PLOS policy on data access is a formal statement that is already practiced or required by many ...means that supporting datasets must be logically annotated and arranged, as in an actual publication and ...efficient science. Improvements in our discipline for annotation and archiving of data are likely to improve research...
Showing: 141 - 160 of 846 results