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We narrowed to 884 results for: ANT;

Showing: 241 - 270 of 884 results

  1. Fluorescent Proteins 101: Aptamer Fluorophores

    Type
    Blog Post
    Published
    April 11, 2017, 2:30 p.m.
    ...aptamers hold a few important advantages over their amino acid-based counterparts, antibodies and enzymes, such...applications, including detection of environmental pollutants, drug discovery, and disease diagnosis. As biosensors...commercial synthesis (those of us who have used antibodies for diagnostics know how frustrating it can be...hybridization (FISH) where fluorophore-linked antibodies are used to visualize RNA. Low signal-to-noise...only in this case ligand binding would bring the relevant ends together rather than separate them (Fig. ...quenchers are still relatively bulky. One of the advantages of oligonucleotides over proteins is their modularity... Years later, Samie Jaffrey’s laboratory took advantage of their deep knowledge of the nature of GFP fluorescence...

  2. Plasmids 101: The Promoter Region – Let's Go!

    Type
    Blog Post
    Published
    April 3, 2014, 8:05 p.m.
    ...expression mRNA Plant promoter from maize ubiquitin gene Constitutive  Gives high expression in plants. H1 small...look at some of its parts. Elements such as the antibiotic resistance gene and the origin of replication...with the type of RNA that needs to be made: if you want mRNA (for gene expression) you need to use an RNAP...various eukaryotic cell types (mammalian, yeast, plants, etc) require unique promoters and there is very...expression. CaMV35S General expression mRNA Strong plant promoter from the Cauliflower Mosaic Virus Constitutive...transcription, the promoter drives either the sense OR antisense transcript depending on its orientation to your...

  3. New and Upcoming Viral Vectors - Spring 2019

    Type
    Blog Post
    Published
    March 26, 2019, 1:40 p.m.
    ... released a new variant of jGCaMP7 (keep reading) and will be releasing more variants in the next few ...few months (see “coming soon”). The 7b variant (pGP-AAV-syn-FLEX-jGCaMP7b-WPRE) exhibits the brightest resting...processes like dendrites and axons. Find the 7b variant of jGCaMP7 in AAV1 at Addgene! See all calcium ...membrane localization and brightness. The F102G variant (pAAV.hSyn-FLEX.iGABASnFR.F102G) is noticeably ...responses to GABA. Find the iGABASnFR and its F102G variant in AAV1 at Addgene! Archon1, a voltage sensor AAV...electrical activity in the brain was measured with implanted electrodes. The Archon1 voltage reporter allows... vectors can be used to visualize cells and to quantify targeting of particular cell types. For example...

  4. 5 Uncommon Ways to Gain Career Skills During an Uncommon Time

    Type
    Blog Post
    Published
    Oct. 20, 2020, 1:15 p.m.
    ... and not in academia is run by grant funding. Learning to write grants quickly, efficiently and effectively...apply to or offer to help with lab grant writing. You may not get the grant or your PI may edit everything...mentors don’t need to be more senior or more “important”, they just need to know you well enough to ask...they can share on their resumes have a definite advantage in our process. We see candidates who have done...thinking about future career options. 5. Write a grant - even if you don’t need one A lot of science in...valuable skill. There are many different kinds of grants that you can apply for. If you are in a lab, your...Here are some sites that have compiled lists of grants: Science: Where to Search for Funding The Ohio...

  5. March for Science

    Type
    Blog Post
    Published
    April 21, 2017, 2:30 p.m.
    ...working full-time, and have received a research grant in the last five years as polled in the American...climate change page on whitehouse.gov, freezing grants, and proposing to defund aspects of research at...scientists if the march highlights data supporting unwanted results (14). Some loss of trust, I fear, has ...m not in the job of having evidence”, scientists want to make sure having evidence is the job of everyone...while many also seek to honor and credit women, immigrants, and minorities who have had great impacts on...on your state in this map. Finally, the march is meant to inspire scientists to be more involved in their...encouraged by “Broader Impacts” requirements for certain grants) (28). As one young scientist, Matthew Niederhuber...

  6. CRISPR 101: Validating Your Genome Edit

    Type
    Blog Post
    Published
    Nov. 3, 2022, 12:15 p.m.
    ... in advance Before validating your edit, it’s important to know a few things about your target cells and...for, you are ready to begin the screening process. Want to set yourself up for a screening success? Before...clones, it’s wise to quickly assess whether a significant number of cells have been edited. For many experiments...goal is to generate a clonal cell line, so it’s important to verify that you won’t need to screen hundreds...in Sanger sequencing and a simple algorithm to quantify editing efficiency by insertion and deletion frequency...that you can easily visualize the size shift you anticipate. A good rule of thumb is to keep your product... effects  While pricier, NGS can be used to quantitatively assess genome edits in your target sequence...

  7. Multiple Plasmids at a Low Price: Kits from Addgene

    Type
    Blog Post
    Published
    Sept. 14, 2016, 2:30 p.m.
    .... "Detection and Quantification of Ribosome Inhibition by Aminoglycoside Antibiotics in Living Bacteria...used to purify a variety of peptides including antibiotic efflux pumps and ankyrin seven-repeat proteins...expressing two genes from a single transcript, or if you want to prevent read-thru transcription from resulting...Helena, et al. "Biosafety of biotechnologically important microalgae: intrinsic suicide switch implementation... was carefully chosen to perform statistically relevant benchmarking of cell-free expression systems, ...Protein Expression Kit has been used to produced recombinant proteins for in-vitro assays: Koch, Daniel, ...By counting DNA sequence reads, FREQ-Seq can quantitatively determine allele frequencies across timepoints...

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

    Type
    Blog Post
    Published
    May 10, 2016, 2:30 p.m.
    ...lentivirus HIV-1. Today, HIV-1 can be controlled with antiviral therapies such that the virus is undetectable ...infections not usually seen in healthy individuals. Antiretroviral therapy (ART) can virtually eliminate plasma...populations were also immune to HIV-1 reinfection. Importantly, no off-target effects were detected. Kaminski...-1 strains, Cas9/gRNA lentiviral expression significantly reduced the HIV-1 copy number, although the ...patients. Although this is an exciting finding, it’s important to note that these HIV-1 patients were ART-naive... be more successful. “Shock and kill” has the advantage of killing cells infected with HIV-1 to deplete...functional Cas9 nuclease, so there’s no potential for aberrant DNA cleavage. Direct HIV-1 cleavage allows T-cells...

  9. Evolution of Brainbow: Using Cre-lox for Multicolor Labeling of Neurons

    Type
    Blog Post
    Published
    April 24, 2015, 2:39 p.m.
    ..., discovered in the 1980s, is one of the most important ways to spatially and temporally control gene ...expression; these deletions are defined using 2 loxP variants (only identical loxP sites can mediate recombination...either deletion removes one of the other loxP site variants, preventing further recombination. Brainbow-1.1...with recombination events specified by three loxP variants, but the principles remain the same. The first...transient Cre recombination is required to prevent constant inversion of the construct. Sanes and Lichtman...sequences are highly homologous, preventing design of antibodies specific to each fluorophore. Third, Brainbow...mKate2.) They then successfully generated custom antibodies to each of these proteins and confirmed that ...

  10. The Many Reasons for Irreproducible Research- and a Vaccine to Eradicate It

    Type
    Blog Post
    Published
    Jan. 30, 2020, 2:15 p.m.
    ...an attempt to present only the most novel or significant findings, and combined with powerful cognitive...QRPs) can quickly lead us to find statistically significant results that are not robust. Sampling noise There...minimized with high powered research designs. Unanticipated discoveries Finally, there are good reasons ...result after conducting a replication study. An important difference between the original setting and the...genetic variation, or different handling can all be important.  If we eliminate the problems above: unclear ...research finding we can be more certain that some important, previously unknown variable actually makes a ...all too often glossed over. This is why it is important to be able to look under the hood at the raw data...

  11. Quick Guide to Working with Drosophila Part 3: Genome Engineering in Flies

    Type
    Blog Post
    Published
    July 28, 2017, 1:30 p.m.
    ...transcription factor important for T cell differentiation (a cell type important for adaptive immune responses...study your favorite gene (YFG).  Sometimes, you want to use the Gal4/UAS system, but the available reagents... to generate a transgenic fly There are a few important points to consider when choosing the vector you...transgene ends up (1): Random insertion has the advantage that you can get varying expression levels of ...comparisons between lines expressing different variants of YFG because the transgenes are found in the...positioning effects). When designing experiments where you want to express multiple transgenes, remember that you...for your flies? Sure, the vector will have an antibiotic resistance gene to select for transformed bacteria...

  12. Screening for Successful Genome Editing with Digital PCR

    Type
    Blog Post
    Published
    March 30, 2017, 2:30 p.m.
    ...: Digital PCR assays can accurately quantify low levels of mutant target (as low as 20 pg or 0.02%) in...validation technology. Digital PCR has several advantages over mismatch nuclease assays that will be elaborated...calculated (details in [2]) and can be used to quantify rates of mutation in a bulk or single cell-derived...As mentioned, these assays have several major advantages over the commonly employed mismatch nuclease ...single wells of a 96-well plate without prior quantification. Comparatively, mismatch assays require between...targets. Comparatively, detection limits of about 5% mutant targets have been reported for mismatch nuclease...bi-allelic mutations: Perhaps the most noteworthy advantage of digital PCR assays is that they are easily ...

  13. Back to Bacteria: CRISPR gRNA Multiplexing Using tRNAs

    Type
    Blog Post
    Published
    June 2, 2015, 6:06 p.m.
    ...-target effects and/or toxicity, it would be advantageous to instead use a preexisting, conserved cellular... just that as part of their CRISPR work in rice plants. Yang was intrigued by the tRNA processing machinery...gRNA expression. Since tRNAs are among the most abundant molecules in a cell, this system is clearly also...leading nucleotide could be processed, a distinct advantage over other methods that favor certain nucleotides...also examined editing efficiency in intact rice plants, comparing traditional gRNA constructs with PTGs... five gRNAs were tested, they found that 50% of plants had biallelic mutations at all five loci. This ...potential of PTGs. Applications of PTGs The major advantage of the PTG system is its universality; robust ...

  14. Plasmids 101: Yeast Vectors

    Type
    Blog Post
    Published
    Feb. 25, 2014, 7:11 p.m.
    ...spontaneously occurring resistant mutants and the insensitivity of yeast strains to some antibiotics. Auxotrophy ...complex internal cell structures similar to those of plants and animals. Unlike bacteria, yeast can post-translationally...yet they still share many of the same technical advantages that come with working with prokaryotes. This...limited to: rapid growth, ease of replica plating and mutant isolation, a well-defined genetic system, and a...yeast cells, in addition to the bacterial ORI and antibiotic selection markers.  The yeast origin of replication...have utilized auxotrophic selection rather than antibiotic selection when working with yeast, due to high...higher copy numbers. Additionally, improvements in antibiotic selection have made utilizing the more traditional...

  15. Kiran Musunuru on the Newest TALEN Genome-Editing System

    Type
    Blog Post
    Published
    Dec. 10, 2013, 3:13 p.m.
    ...uncover new gene variants associated with conditions of interest, then studying those variants in model systems... differentiate those mutant and wild type stem cells into any cell type relevant to the disease in question...efficiently generate human stem cells edited to carry mutant versions of 15 different disease-associated genes...together, there are occasional errors. That can be advantageous if you are trying to knock out a gene. One can...homology-directed repair by flooding the cell with a mutant template and fooling the cell into using that template...implicated in disease or, in cases where particular variants or mutations have been reported in people, we ...The TALEN kit is quite useful in generating the mutant cell lines that one needs to do disease modeling...

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

    Type
    Blog Post
    Published
    June 8, 2017, 2:30 p.m.
    ...requirement for quantitative live-cell imaging, it is important to be able to quantify the photostability... non-linear dependence on excitation power is important since different fluorescence imaging strategies...Selecting a photostable protein The issues with quantification of photobleaching rates can be summarized as...water/oil emulsion at high power, it is far more relevant to measure how fluorescence intensity evolves ...higher excitation power, the photostability of the variants is comparable (lower panel of figure 1). To avoid...avoid changes in excitation power, it is important to perform the experiments on a single day on a stable... exchanging excitation filters). This avoids substantial changes in excitation power and will help to ...

  17. Rosella: A Fluorescent pH-Biosensor for Studying Autophagy

    Type
    Blog Post
    Published
    April 13, 2017, 2:30 p.m.
    ...induced and quantified by measuring the amount of radioactivity in the culture supernatant (this is indicative...relatively pH-insensitive RFP variant, DsRed.T3 and a pH-sensitive GFP variant, super ecliptic pHluorin (... inhibitor. While this method does provide a quantitative measure of autophagy, it only measures bulk ... the protein. To monitor autophagy, the Pho8Δ60 mutant protein is expressed. Pho8Δ60 localizes to the ...final read out of this assay. This is also a quantitative measure of autophagy, but, like the protein ...sequence. Under normal growth conditions, both variants are excluded from the vacuole and emit red and...the cytosol-targeted and mitochondria-targeted variants are available from Addgene. References 1. Rosado...

  18. All in a Twist: dsRNA

    Type
    Blog Post
    Published
    Feb. 2, 2023, 2:15 p.m.
    ...amount of siRNA to be delivered or anticipating this response are important considerations when using these... how these structures are generated, why it’s important for cells to sense their formation, and how clinicians...This pathway has been clinically exploited for antiviral purposes similar to that of vaccines. If you know...is certainly a double-edged sword – balancing antiviral benefits with the inflammatory response associated...RNA hybrids. Unlike dsRNA, DNA:RNA hybrids are abundant in normal cells and are arise from a ssRNA engaging...However, transcription of thousands of genes is constantly occurring throughout a single cell, so these ...in turn lead to genome instability. Thus, it’s important to strike a balance between productive levels ...

  19. Gendered Innovations: Why Does Sex of the Cell Matter?

    Type
    Blog Post
    Published
    July 21, 2016, 2:30 p.m.
    ...into research. Why are sex and gender analysis important? Doing research wrong costs lives and money. According... goal of gendered innovations It is crucially important to get the research right from the beginning. ... one of them. Why might the sex of the cell be relevant? Research shows that there are sex differences... and arbitrary decision. Unfortunately, it also meant that, by the very nature of the way the experiments...unique to male stem cells. Nor did they detect important differences in function between male and female...results, but this result shouldn’t be taken for granted for all research going forward. It’s just not that...many factors that interact with sex, and it’s important to analyze these factors during an experiment....

  20. Addgene's Tips for Plasmid Quality Control

    Type
    Blog Post
    Published
    Jan. 14, 2016, 3:30 p.m.
    ...mutations, antibiotic resistance, restriction sites used during cloning, and most importantly, the predicted...any other important features that differentiate this plasmid from its predecessor. Important features ...organize your own plasmid collection, although you will want to keep digital copies of your predicted sequence...sequence verify the plasmids. This is the most important step in ensuring quality, as it will catch any...sometimes have to design new primers to sequence the important features. You can use primer design software such...your primer binding site and the first feature you want to verify because you won’t get reliable sequence... amino acids worth, so make sure the feature you want to verify is within this range. Read some of our...

  21. Generating Mouse Models Using CRISPR/Cas9

    Type
    Blog Post
    Published
    July 12, 2016, 2:30 p.m.
    ... a mouse model, and its success is not always guaranteed. To learn more about this process check out our... embryos as Cas9 from S. pyogenes and has the advantage of being smaller (Zhang et al., 2016). For editing...components can be electroporated into the oviduct of pregnant females, a technique called Genome editing via...injection into either an oocyte or into the oviduct of pregnant females (Yoon et al., 2018, Mizuno et al., 2018...replacement of the murine sequence with a human gene. Advantages of using CRISPR for mouse genome engineering ...the efficiency discussed above extends 4 major advantages of CRISPR mouse editing when compared to more...is much more efficient at generating the desired mutant offspring, with 85% success compared to 50% when...

  22. PiggyBac-ing Through the Genome Editing Field

    Type
    Blog Post
    Published
    May 31, 2016, 3:30 p.m.
    ...the gene is constitutively-active or a dominant-negative mutant. Reducing the copy number can also mitigate... gene repair with oligodeoxynucleotides: wanted and unwanted target locus modifications.,” Mol. Ther.,...useful for genetic engineering approaches. Most importantly for this technology, however, is that the transposase...of interest. The piggyBac™ system allows for significantly enhanced random integration efficiencies that...should be tested in the cell line of interest. Importantly, by varying these ratios, you can either maximize... If the cell’s chromatin structure undergoes significant rearrangement (such as when a stem cell initiates...transposon sequences.  The use of PBx is particularly important to avoid any possible random re-integration from...

  23. What's New in CRISPR - Winter 2018

    Type
    Blog Post
    Published
    Dec. 18, 2018, 1:17 p.m.
    ...genome editing in plants While there have been many Cas nucleases developed for plants, it has been difficult...Cas-mediated genome engineering in plants. Read the paper in bioRxiv Find the plant genome editing toolkit ...the Cas14 plasmids Anti-CRISPR proteins for optogenetic control of CRISPR-Cas9 Anti-CRISPR proteins that...specificity of multiple wild-type and engineered variants of Cas nucleases. In doing so, they also created...discovered in 2017. Now Dominik Niopek’s lab has adapted anti-CRISPR proteins for optogenetic control of CRISPR-Cas9...post Read the paper in Nature Methods Find the anti-CRISPR plasmids Tagging human transcription factors...

  24. Split Fluorescent Proteins for Studying Protein-Protein Interactions

    Type
    Blog Post
    Published
    May 3, 2022, 1:15 p.m.
    ...nucleoporin. Lu et al. Plant J. 2010 Yuhai Cui Red mScarlet Split-wrmScarlet variant of mScarlet Split-wrmScarlet...Complementation (BiFC). It can provide a qualitative or quantitative readout of the interaction in vivo or in vitro...includes I152L in N-terminal fragment An enhanced recombinant amino-terminal acetylation system and novel in...aa 155), includes I152L in N-terminal fragment Constant rate of p53 tetramerization in response to DNA...-10) and sfCherry2(11), also photo-activatable variant PAsfCherry2(1-10) Improved split fluorescent proteins...presence of heme oxygenase for chromophore formation (abundant in eukaryotes) A Near-Infrared BiFC Reporter for...presence of heme oxygenase for chromophore formation (abundant in eukaryotes) Bright monomeric near-infrared ...

  25. A Look Back at One Year of Plasmid Sharing for COVID-19 Research

    Type
    Blog Post
    Published
    July 12, 2021, 1:15 p.m.
    ...COVID-19 research in other labs. Spike protein, variants, and pseudotyping The SARS-CoV-2 virus depends...cellular receptor. To more easily study the spike variants, scientists have developed ways to pseudotype ...part of a study that examined the repertoire of antibodies from 19 COVID-19 convalescent individuals (Tong... has had many opportunities to evolve. Several variants are now circulating and plasmids containing these...pseudovirus and those encoding different spike protein variants that can be incorporated into pseudoviruses. The...at neutralizing the different SARS-CoV-2 spike variants. You can learn more about their research in this... COVID-19, aside from the widely used qPCR and antigen tests.  Labs including Jennifer Doudna’s lab and...

  26. CRISPR 101: Targeting Non-Coding RNAs with CRISPR/Cas9

    Type
    Blog Post
    Published
    Nov. 14, 2024, 2:15 p.m.
    ...Cas protein variants may also be useful for targeting ncRNAs. For example, the Cas12a variant can cleave...RNAs in Plants with the CRISPR-Cas Technology is a Challenge yet Worth Accepting. Front Plant Sci. 2015...transcribed but do not encode proteins. They play important roles in many cellular and regulatory processes...into the break sites. Knock-in experiments are important for visualizing ncRNA localization and function...complex and not yet fully understood, so it is important to carefully select the target locations of knock-in... ncRNAs.  CRISPRi and CRISPRa For scientists who want to modulate ncRNA expression without permanently...genomic elements (Hazan and Bester 2021). Other Cas variants Another option is CRISPR/Cas13, which targets ...

  27. Adapting Toehold Switches to Detect Zika Virus

    Type
    Blog Post
    Published
    Aug. 30, 2016, 2:30 p.m.
    ...portable quantification of diagnostic results.  Our approach now detects samples at clinically relevant concentrations...in a clinically relevant setting. Molecular diagnostics for the Zika virus predominantly look at viral ..., and North America. Diagnostics will play an important role in helping to monitor and slow this spread... synthetic gene networks for the detection of antibiotic resistance and strain-specific diagnostics for...develop our paper-based platform into clinically relevant diagnostics for the Zika virus was daunting. It...American-lineages). Strain discrimination is especially important in the current outbreak because of the neurological...Pardee and Alexander Green! Keith Pardee is an Assistant professor in the Leslie Dan Faculty of Pharmacy...

  28. Transferable Skills Guide: Managing a Team

    Type
    Blog Post
    Published
    Jan. 30, 2018, 2:42 p.m.
    ...he didn’t want to spend hours reviewing papers to piece together the best protocol;  he wanted to get going...how to prioritize but I  just added the “most important” tasks my schedule. This was bad for 2 reasons...to focus on what you should be doing : writing a grant, thinking about the next project, reaching out to...expectations, answer any questions, and (most importantly) decide on a timeline. My experience is that ...your team’s success depend on it.  Equally as important is to be able to actively listen - this can be...working with X?”  is going to get you what you really want to know. Remember that one on one discussion can...counter-productive. I always assume that reports want to succeed at work and providing feedback is needed...

  29. Cloning Mammalian Cells with the Agarose Method

    Type
    Blog Post
    Published
    Sept. 7, 2017, 12:17 p.m.
    ...glass cloning rings to isolate colonies of antibiotic-resistant cells; during the time required to grease... video below) is simple: After obtaining antibiotic-resistant colonies, use a Sharpie to circle 12-48 ... do not normally use antibiotics. Lastly, and perhaps obviously, it is important to have a functional ... inside of the wrist or the cheek. (Parents of infants will have no problem with this!) Make sure your...levels of expression of our gene of interest. Advantages of the agarose cloning method The agarose technique...cells did not seem to form discrete colonies but constantly migrated away from each other. In our experience...morphology or other physiological properties. An advantage of this technique is the potentially large number...

  30. Pooled Library Amplifications

    Type
    Blog Post
    Published
    May 30, 2024, 1:30 p.m.
    ...applications. As individual libraries can vary significantly, it’s important that we have an amplification protocol...and the desired coverage for the library (How important is it that every single plasmid in your library...protocol. Created with BioRender.com.   The most important factor to consider is your desired library coverage... plasmids in your library. As an example, if you want 100x coverage of your library, and your library ...500,000 colonies.  Pro tip! Since you probably do not want to individually count 500,000 colonies, you’ll likely... is less than that of electroporation, but an advantage is that chemical transformations are generally...overtake larger plasmids, if the library varies significantly in plasmid size). On plates, each transformed...
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