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We narrowed to 902 results for: nes

Showing: 221 - 240 of 902 results

  1. PiggyBac-ing Through the Genome Editing Field

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    Blog Post
    ...cell lines? One of the major uses of the piggyBac™ system is to create stable transgenic cell lines. The...method of making stable cell lines is to transfect, select, and isolate clones. This procedure is cumbersome...expression of certain genes, such as those that have negative impacts on fitness. One consideration when...including making transgenic cell lines and genetically-modified cell lines. Furthermore, the use of piggyBac...be used for numerous applications, including transgenesis, gene-trap screens, and gene editing. How does...genetic manipulations in animal models or cells lines, including stem cells, without leaving behind any... somewhere between one hundred and one thousand clones to find a cell line with the edit of interest. ...

  2. RNA Interference in Plant Biology: New Tools for an Old Favorite

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    Blog Post
    ...different Dicer-like enzymes are involved in the biogenesis of different small RNAs (Figure 1). These siRNAs...elicits immunogenic reactions that complicate the effectiveness and interpretation of RNAi. Fortunately, researchers...incorrectly relegate RNAi to history. The straightforwardness of RNAi is unmatched—unlike CRISPR experiments...the level of DNA, thereby limiting CRISPR’s effectiveness at high copy numbers and genomic loci with low...strategies cannot be used to investigate essential genes. Historically, gene silencing methods were thought...equivalently precise, but each method recovered different genes known to be required for viability (Morgens et al...list emerge that accurately reflected the scope of genes known to be essential for cell growth. Together,...

  3. Plasmids 101: Gene, enhancer, and promoter trapping

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    Blog Post
    ...predicted genes have unidentified roles as well (Vanni, et al). Is it true that this many genes are truly...biologically relevant situations. Tissue-specific genes – the genes of interest may not be expressed in the tissue... be observed. Functionally redundant genes – multiple genes which function in overlapping roles can...Around 20% of human genes have no known function or a poorly defined function (Wood, et al). In the microbial...line you are working with. Development-specific genes – if a gene functions at multiple stages in development...the organism you are working in. The spacing of genes and whether or not it’s ok to disrupt endogenous...construct to generate a collection of monitored genes and mutants - viral integration, transposon, and...

  4. Antibiotic Resistance: An Old Solution but a New Problem

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    Blog Post
    ... one bacterium sharing genes with another, an accidental transmission of genes from one bacterium to another...without a new, drug-resistant ‘superbug’ making headlines in one part of the world or another. Bacterial...part in our own health and the health of our loved ones, and become a positive force for public health. ...consuming to treat. Learn How Antibiotic Resistance Genes Are Used in the Lab How does antibiotic resistance...bacterial cells), or a bacterium picking up resistance genes from it’s environment (from DNA left behind after...while the few that happen to possess resistance genes survive and multiply. Factors contributing to the... bacteria are resistant to antibiotics and which ones aren't?     This video shows how to perform a...

  5. Using Video to Share Your Science: We Share Science

    Type
    Blog Post
    ...research for single or multiple disciplines – you can select the disciplines and the years. Which leads to... as researchers in other countries or ot­her disciplines, are even less likely to read about our work.... have time to read about research from other disciplines, or from other countries, to explore new connections...the challenge of keeping up on studies in many disciplines has been a long brewing frustration for me. I... I read a variety of psychology, business, personnel, and sociology journals when I get a chance, but ...from ideas garnered from research in another disciplines – maybe psychology, maybe economics, or maybe...increasingly citing research from outside of their disciplines. Included in the article is an interactive chart...

  6. Plasmids 101: Broad Host Range Plasmids

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    Blog Post
    ...viscosus, Aerobacter aerogenes, Aeromonas hydrophila, Agrobacterium tumefaciens, Alcaligenes eutrophus, Azotobacter...salmonicida, Agrobacterium tumefaciens, A. rhizogenes, Alcaligenes eutrophus, Enterobacter sp., Erwinia amylovora...plasmids in nature, and provide tips on how we can harness those features to create broad host range recombinant...range and can replicate and stably maintain the genes they carry among organisms belonging to many different...processes, and can be used by scientists across disciplines.  What confers broad host range in plasmids? ...that the plasmid is conjugative and carries the genes necessary for transfer initiation between bacterial...Acinetobacter spp., Aeromonas spp., Agrobacterium spp., Alcaligenes spp., Aliivibrio salmonicida, Anabaena spp., ...

  7. Getting the Most from Your Lentiviral Transduction

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    Blog Post
    ...permissive cell lines such as HEK293, H0 or A549 and assume that the results obtained in these lines can be translated...laboratory tool often employed to establish cell lines that stably express a gene of interest. While the...lead to low titers and poor transductions. Cell lines should be routinely subcultured at densities that... cells do not take up nucleic acid or express transgenes as well as actively dividing cells resulting ...personnel. If you are unsure of the background of the lines you are using, it is best to start from scratch.... a variety of sources such as serum, other cell lines, or infected personnel and can persist undetected...mycoplasma detection kits that use detector cell lines, ELISA, fluorometry, or PCR-based approaches to ...

  8. Antibody Neutralization Response Against Pseudoviruses Expressing SARS-CoV-2 Spike Protein Variants

    Type
    Blog Post
    ...the mRNA vaccines While there have been many studies on the effectiveness of current vaccines against ...lab found that the neutralization effectiveness of current vaccines differed depending on the variants...vaccination efforts. So, how effective are the current vaccines against the variants? Alejandro Balazs, a Group...assay. Neutralization was quantified in terms of luminescence. Image from Garcia-Beltran et al., 2021 with...key drivers in determining whether the current vaccines are effective or not. This protein both elicits...elicits an immune response as the target of vaccines and allows the virus to gain entry into human cells via...target cells and this can be detected via loss of luminescence.     B.1.351 variant neutralization escape ...

  9. Troubleshooting and Optimizing a Western Blot

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    Blog Post
    ...using two membranes during your transfer instead of one. If you see signal on both membranes, you know... run the same protein concentration in multiple lanes and cut up the membrane to treat each lane with ...   Figure 2: Reagent gradient. Here, the lanes are lightly marked on the membrane (1) using the... time.   Samples can run into empty neighboring lanes, so load your gel to ensure your samples and reference...troubleshoot.   Before you start… Mark your membrane! Membranes look the same from both sides, so it’s quite easy...may be under-transferring.  Membrane pore size Membranes come in different pore sizes for different proteins...(< 15 kDa) and a 0.45 µm (p) membrane for larger ones. Changing your membrane size is probably the easiest...

  10. CRISPR 101: Engineering the Plant Genome Using CRISPR/Cas9

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    Blog Post
    ...repression of target genes in plants and many of the aforementioned empty gRNA backbones also contain Cas9...for targeted modification of known or suspected genes that regulate a desired phenotype. In fact, CRISPR...be used to knockout, activate or repress target genes in plants using the same general experimental design...cells. Like other model systems, expression of S. pyogenes Cas9 or Cas9 variants (hereafter referred to as...respective species. Addgene carries >30 “empty gRNA” backbones which contain a plant pol III promoter and gRNA... can also be used to activate or repress target genes in plant cells, respectively. Cas9 expression is..., and a Ti "helper" plasmid, which contains Vir genes necessary for T-DNA processing and insertion into...

  11. CRISPR 101: Validating Your Genome Edit

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    Blog Post
    ...individual clones from that population. You can additionally calculate the minimum number of clones you would... sequence clones to verify that the deletions introduced are out of frame but finding clones with deletions... success? Before you start analyzing individual clones, it’s wise to quickly assess whether a significant...verify that you won’t need to screen hundreds of clones looking for your edit of interest. For all of the...before going on to generate and screen individual clones. If a clonal line isn’t your end goal, then a single...is sequencing trace files of WT and edited cell lines. Then decomposition analysis is performed yielding... clone, you should screen, at the very least, 4 clones. Did you use a dual guide system to generate your...

  12. Antibodies 101: Isotypes

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    Blog Post
    ... by the heavy-chain constant genes μ and ẟ. These are the first two genes in the heavy-chain constant ...intervening heavy-chain constant domain genes, placing the variable domain genes next to a different constant domain... you heard of an antibody isotype? An isotype determines several key characteristics of an antibody as...an antibody’s isotype is important because it determines what immune cells and molecules are recruited...nomenclature. Antibody heavy chain proteins as well as the genes that encode those proteins are designated by the...tears, saliva, mucus) where it protects mucosal membranes. This isotype is most commonly a dimer with a ...type of DNA recombination. Heavy chain constant genes are clustered together downstream of the variable...

  13. Educational Planarian Tools for Teaching Developmental Biology Techniques

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    Blog Post
    ...planarian genes, we encourage you to deposit them back with Addgene and expand the number of genes that other...Hybridization (WISH) for visualizing expression of genes. Double-stranded RNA (dsRNA)-mediated RNA interference...expression and functions of key regeneration-related genes in four inexpensive and commercially available planarians...and Phagocata gracillis. There are 11 different genes cloned into plasmids to investigate for each of ...changes to visualize the expression of specific genes. After riboprobe binding (via hybridization) specific...The expression patterns of 11 different planarian genes (all of which are available through the deposit)...powerful tool for performing targeted knockdowns of genes of interest and was first discovered and characterized...

  14. Pathways Over Time Plasmids Engage Students in Functional Genomics Research

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    Blog Post
    ...computational methods to identify genes by their similarities to genes in other species, but these studies...MET genes to grow.) Students then use replica plating to determine if expression of MET/Met genes from... to answer questions about the evolution of the genes involved in methionine synthesis (5). The budding...strains with overexpression plasmids carrying MET/Met genes from either S. pombe or S. cerevisiae. Students ... the coding sequences for ten different MET/Met genes (Figure 1) from the two yeast species into the pYES2.1...uracil supplementation (6). Expression of MET/Met genes from the pYES2.1 plasmid is controlled by the GAL1...have shown that most, but not all, S. pombe Met genes complement the corresponding S. cerevisiae met deficiencies...

  15. Fluorescent Proteins 101: History of Fluorescent Proteins

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    Blog Post
    ... light include chemiluminescent proteins, like luciferases, as well as fluorescent ones, like Green Fluorescent...that, although they are not bioluminescent, some types of corals and anemones are vibrantly colored. He ...Luminescent molecules are very useful tools because we can easily detect and measure the light they emit...Protein (GFP). These molecules occur naturally in bioluminescent organisms, but their real power lies in the...interesting. Although humans have known about bioluminescent organisms and their characteristic radiance..., in the 1960s, Osamu Shimomura studied the bioluminescent properties observed in the crystal jellyfish...the culprits. He even obtained samples of certain ones from local pet shop aquariums in Moscow where he...

  16. Plasmids 101: Using Transposons in the Lab

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    Blog Post
    ...bacteria, transposons can move antibiotic resistance genes between plasmids or from plasmids to the bacteria... and mechanism of replication. They contain two genes: gag and pol. The pol polyprotein encodes the reverse...transposon in vertebrates. It was discovered in Japanese medaka fish because its insertion into the fish... how they can be used in the lab. Transposon mutagenesis screens Transposons, by their nature, are mutagenic... elements, which makes them a great tool for mutagenesis screens that detect loss-of-function or gain-... these screens, the transposons encode reporter genes, mutagenic cassettes, or barcodes. When transposons...to consider when selecting a transposon for a mutagenesis screen. For example, piggyBac and Tol2 are best...

  17. A new platform for fast functional characterization of potentially cancerous mutations

    Type
    Blog Post
    ...perturbations that may play significant roles in cancer pathogenesis. Their work culminated in the first functional...help cancer researchers studying an assortment of genes. Using patient data to identify mutations of unknown...mutations with strong phenotypic effects can mask weaker ones. Thus, the need for a faster and higher-throughput... team identified 1,049 perturbations in several genes spanning 33 cancer types. The types of mutations...lentiviral constructs using the High-Throughput Mutagenesis and Molecular Barcoding (HiTMMoB) technique (.... Plasmids carrying the corresponding wild-type genes were constructed as well. They called this library.../F3 and MCF10A are growth factor dependent cell lines and any mutations that that confer proliferation...

  18. AAVs in Retinal Gene Therapy

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    Blog Post
    ...Syndrome (a disease that results in combined deafness and blindness) is caused by defects in the gene MYO7a...Jean Bennett started working on ways to deliver genes to correct genetic conditions over 25 years ago ...to the identification of several disease-causing genes, including the RPE65 gene responsible for an autosomal...autosomal recessive, severe, childhood-onset form of blindness name Leber’s Congenital Amaurosis (LCA). Shortly...treatment, famously visited Congress to help increase awareness about the potential of gene therapy!). It would... packaging capacity is well suited for larger transgenes. Unfortunately it has limited tropism in the ...used in clinical trials, a variety of engineered ones have shown great promise in preclinical studies ...

  19. Plasmids 101: Gateway Cloning

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    Blog Post
    ...Addgene also has ready-made entry clones available for many popular genes, including Hs.KRAS4a. Use our website...selection Used to clone attB-flanked genes of interest to generate entry clones Entry vector attL sites for...competent E. coli cells and select the positive clones. The entry clone and destination vector carry different... recombination step. Addgene’s ready-made entry clones can be used with a large variety of plasmids. Speed...for recombination Used to generate entry clones by TOPO cloning or by Restriction Cloning Destination...the gene of interest in the appropriate system Recombines with the entry clone to generate an expression...plasmids with Addgene. These can be used to express genes in a variety of model organisms. Use the links below...

  20. New Tools Enable CRISPRa for Neuroscience Applications

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    Blog Post
    ... the paucity of Cre-dependent mouse lines for overexpressing genes within discrete cell populations makes...libraries. However, using CRISPRa to target individual genes can be relatively laborious because multiple plasmids...several sgRNAs must be screened to identify effective ones. Simplified in vivo delivery using SPH mice CRISPRa...neurons over other promoters, including ubiquitous ones such as EF-1α and CAG. Figure 2: Dual lentivirus...resulted in hundreds of differentially expressed genes between Bdnf I-overexpressing neurons and Bdnf IV-overexpressing...IV-overexpressing neurons. Among the upregulated genes common between the Bdnf I and Bdnf IV overexpression...overexpression variants were other immediate-early genes associated with neuronal activity, such as Fos, Egr3,...
Showing: 221 - 240 of 902 results