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We narrowed to 1,043 results for: ELL

Showing: 301 - 320 of 1043 results

  1. Hot Plasmids - November 2023

    Type
    Blog Post
    ... between living cells by TransitID. Cell, 186(15), 3307–3324.e30. doi: 10.1016/j.cell.2023.05.044. PMID... efficient prime editors. Cell, 186(18), 3983–4002.e26. doi: 10.1016/j.cell.2023.07.039. PMID: 37657419...lentivirus and MMLV gag, to specific cell types. It can also make CAR-T cell therapy more accessible by simplifying...Optogenetic proximity labeling and TransitID Tracking cellular history with protein ticker tape Teaching an old...called DIRECTED (Delivery to Intended REcipient Cells Through Envelope Design). This modular approach ...viral surface, expanding the range of targetable cell types. DIRECTED is compatible with fusogens from...process and could even enable the creation of CAR-T cells directly within the body. Overall, DIRECTED can ...

  2. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

    Type
    Blog Post
    ...of proteins, organelles, and cells. Similar to FPs, PA-FPs allow for non-invasive labelling, but in contrast...Tetrameric PA-FPS are better for whole cell imaging and studying organelle trafficking. Monomeric PA-FPs are...localization, turnover, and trafficking, as well as organelle trafficking and dynamics (fission, fusion,...offer scientists a simple yet powerful way to tag cellular proteins and investigate protein localization,...continuously synthesized and degraded within the cell, so at any given time, an FP-chimeric protein may... reported was PA-GFP. PA-GFP was derived from Jellyfish (Aequorea victoria) GFP (wtGFP) by mutating Threonine...Since emission of green light is more phototoxic to cells, most scientists working on in vivo imaging models...

  3. Viral Vectors 101: Biosensors

    Type
    Blog Post
    ...the caffeine of the cell!)—ATP. There are biosensors for intracellular, extracellular, and even the ADP:... as proxies for a cellular process or directly measure a cellular process. Cellular phenomena such as ... measure real-time cellular reactions to stimuli and as well as changes in cellular dynamics during so-called...type of cells the viral particles infect. This can direct your biosensor to specific tissues or cell (sub...biosensor is the thing that you care about within your cellular or animal system. This ‘thing’ could be a neurotransmitter...blog we will focus on those which can be applied in cell culture and animal models primarily. Fun fact: Almost...These ion sensors can be targeted to different cellular locations or tissues depending on the biology ...

  4. Five Popular Model Organisms

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    Blog Post
    ... properties and processes with our own cells. Like human cells, yeast DNA is packaged into chromosomes...differentiation of β-cells in the the developing zebrafish pancreas. They first tagged these cells using plasmids...By Alyssa Cecchetelli and Lukas Morgan Model organisms are vital tools used by researchers around the...recapitulate the complex interactions between cancer cells, therapeutic drugs, and the rest of the body than...than studies in other model organisms or cell culture. For example, Scott Lowe’s lab utilized mice to study...to identify a set of mutations that made cancer cells more resistant to chemotherapy. You can find these...to optimally control gene expression in specific cells of the fly (Pfeiffer et al., 2010). Yeast (Saccharomyces...

  5. Fluorescent Proteins 101: When GFP lets you down

    Type
    Blog Post
    ...fluorescent in acidic organelles (Figure 1), showing that its acid tolerance is maintained in cells.   GFP is big...proteins to study mRNA trafficking in living cells." Methods in cell biology 85 (2008): 273-292. PubMed PMID...genomic loci in living human cells by an optimized CRISPR/Cas system." Cell 155.7 (2013): 1479-1491. PubMed... fluorescent protein in almost all organisms and cell types, (ii) no need to add a co-factor, (iii) easy...toleration in fusion proteins. Since GFP is such a well-validated, all-round good performing probe, it is...introducing two mutations (F64L, S65T) in the original jellyfish GFP (AvGFP) to create enhanced GFP (EGFP), a variant... the bathing solution and require uptake by the cells. Which of these strategies works best for a specific...

  6. CRISPR 101: Cytosine and Adenine Base Editors

    Type
    Blog Post
    ...that it appears “newly synthesized” to the cell. Thus, the cell repairs the DNA using the U-containing strand..., which may lead to cell death rather than NHEJ repair, thus removing these cells from the edited population... starting point, Gaudelli evolved the base editor into 40 new ABE8 variants (Gaudelli et al., 2020). Compared...target modification in primary T cells, making them a promising tool for cell therapy applications. Dual base...editing than ABE7.10 Gaudelli et al., 2020 ABE8e   Efficient editing in primary cells Zhang et al., 2020...., Peraro, L., Young, L., Lee, S.-J., Ciaramella, G., & Gaudelli, N. M. (2023). Improved cytosine base...relatively low frequency, especially in nondividing cells. Scientists everywhere wistfully imagined being ...

  7. Antibodies 101: Producing Recombinant Antibodies

    Type
    Blog Post
    ...and yeast cells are cost-effective and faster-growing than mammalian cells, but mammalian cells can perform...your cells with your plasmid(s), and then wait 7-14 days (in mammalian cells) to collect the cell culture...production system, cell lines typically used include Human Embryonic Kidney (HEK) cells and Chinese Hamster...An antibody that performs well in immunohistochemistry may not perform well in a western blot. This can...recombinant antibodies with some molecular biology and cell culture experience. Let’s go over the basics of ... place in bacterial, yeast, plant, or mammalian cells. Each of these systems has their advantages and ...post-translational modifications that bacterial and most yeast cells cannot. Your choice of production system may depend...

  8. All in a Twist: dsRNA

    Type
    Blog Post
    ...mammalian cells. Here, we will cover how these structures are generated, why it’s important for cells to sense...that doesn’t involve cellular dysregulation) is the mitochondria. These organelles have their own circular...., Hur, S. Cellular origins of dsRNA, their recognition and consequences. Nat Rev Mol Cell Biol, 23: 286...are the words that describe RNA! Double stranded? Well, that’s just for DNA – right? RNA performs almost...almost all of its biological functions in our cells in the single strand form, but double stranded RNA and...with bidirectional transcription. In an uninfected cell, dsRNA rarely circulates, but upon viral infection...clinical therapy to target pathogenic proteins, as well as in the lab to deplete expression of proteins ...

  9. Supporting Rare Disease Research with the 2020 BeHEARD Awards

    Type
    Blog Post
    ... trigger the activation of dendritic cells, macrophages, T cells, and the recruitment of neutrophils. ... says. In induced pluripotent stem cells derived endothelial cells from women who are missing an entire...detect molecules outside of the cell and translate those signals into cellular responses. For example, GPCRs...estimated that CTD is the second cause of male intellectual disability after Fragile X. There is no cure...maintaining the nutrient and ionic balance of the cells,” says Dr Sangeetha Iyer, ACD’s Scientific Advisor...that solute channels typically expressed on other cell types can compensate for or bypass the dysfunction...collection to perform a functional screen in mammalian cells to identify any solute channels that can compensate...

  10. Plasmids 101: Plasmid Incompatibility

    Type
    Blog Post
    ...copy number in the cell is high, but allows replication when copy number in the cell falls too low (Novcik...system to partition themselves to each daughter cell during cell division. They don’t simply rely on chance...eukaryotic cells). The partition NTPase is recruited and “walks” each plasmid to a separate daughter cell. When...to an identification issue: the CBPs in the cell can’t tell the difference between plasmids if they have... daughter cell, instead of partitioning each type of plasmid into a separate daughter cells (Figure 2)...from the cell with the same probability, or asymmetrical, where one plasmid lost from the cell at a higher...different plasmids to be maintained in one bacterial cell. In this Plasmids 101 post, we’ll cover why this...

  11. Predicting Adverse Reactions to Monoclonal Antibody Drugs

    Type
    Blog Post
    ...epitopes likely to be presented by T cells to elicit an immune response. T cell epitopes are found in either ...predict T cell epitopes focus on characterizing those epitopes as CD8 or CD4 epitopes, as well as their...that take place within an antigen-presenting cell like a T cell. It is also not yet possible for these algorithms...traditional 2D assays with immune cell lines or peripheral blood mononuclear cells (PBMC) in 3D models of the...CD4+ or CD8+ T-cells or monocytes. PBMCs can be further differentiated into dentritic cells or macrophages...skin and subcutaneous models (Groell et.al, 2018). Treating these cells with the therapeutic antibody ..., that are commonly used for the prediction of T cell epitopes based on the amino acid sequence of the...

  12. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    ...associated with cellular organelles, scientists have been able to study many cellular processes, including...and function of cellular systems. FPs have been used to track protein localization, cell structure, intracellular...to fluorescently tag markers of cellular structures in mammalian cells. These plasmids use fluorescent...Depletion in Human Cells by Auxin-Inducible Degron Tagging with Short Homology Donors.” Cell Rep.15(1) (2016...trafficking. Although FPs have enabled discovery of many cellular mechanisms, there are some limitations to working... ultimately misinterpretation of the protein’s cellular role. One way to avoid the pitfalls of overexpressed...synthetic DNA for the desired gRNA target sequence, as well as the 5’ and 3’ homology arm repair template (Fig...

  13. Fluorescent Proteins 101: Fluorescent Protein Timers

    Type
    Blog Post
    ...to monitor cell, organelle, and protein localization. For instance, you might dye your cells and look at...either in whole cells or as a pool of fusion proteins localized to a specific region of the cell. For example...the relationship between the age of a cell, protein, or cellular structure and a particular biological...trafficking to a subcellular location, start of gene expression, development of a cell structure, etc)....biology, FP timers might be able to tell researchers whether old or new cells are better at producing a compound...microscope, fractionate samples to isolate particular organelles and their contents, or perform in situ hybridization...timers, researchers can look at a single image of a cell and understand how protein localization changes ...

  14. Adeno-associated Viruses (AAVs) for Genome Editing

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    Blog Post
    ...K562 leukemia cell line and ~8 and 9% efficiencies in T-cells and hematopoietic stem cells respectively... not well understood, researchers have been using AAV vectors for gene editing in mammalian cells since...transient transfection of 293T cells with helpers, and used to infect recipient cells. After G418 selection, ...since 1998. In that year, Russell and Hirata from the University of Washington reported a surprising finding...used to routinely deliver sequences of interest to cells with efficiencies of 1-40% after G418 selection ...composed of single stranded DNA, which is particularly well suited for strand invasion, a key step in the homologous...the p53 and PTEN tumor suppressor genes in human cells (Kim et al 2008). They have also used AAV gene editing...

  15. Viral Vectors 101: Gamma-Retroviral Packaging Systems

    Type
    Blog Post
    ...packaging cell line. γ-Retroviruses can transduce target cells, but the transduced target cell does not...using helper-free packaging cell lines This method utilizes a packaging cell line that stably expresses... packaging cell line. For example, Phoenix, a second generation γ-retrovirus packaging cell line developed...and rat cells), or an amphotropic envelope, Phoenix-AMPHO (for the infection of mammalian cells.) Using...transduce both dividing and non-dividing cells because once in the host cell cytoplasm, the viral components are...for efficient gene delivery to mammalian cells using 293T cell-based systems. Curr Protoc Immunol. 2001...γ-retroviruses (gamma-retroviruses) in cancer and stem cell research has prompted the development of multiple...

  16. Lentiviral Vector Uses and Overview

    Type
    Blog Post
    ... of cell types, so they’re ideal for work with primary cells or other difficult-to-transfect cells. Lentiviral...dividing cells. Another type of vector, based on adenovirus, could infect non-dividing cells, but without...turned to the lentivirus HIV-1, well-known to infect non-dividing cells. The first lentiviral vector system...ability to transduce both dividing and non-dividing cells. Lentiviral vectors are the vector of choice for...viral envelope to dictate the tropism, or types of cells the vector could infect. Finally, the transfer plasmid.... After co-transfection of these plasmids, 293T cells released transgene-containing lentiviral particles...adeno-associated viral vectors can also target non-dividing cells, lentiviral vectors can carry much more genetic ...

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

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    Blog Post
    ...lines expressing GFP in specific cell types to do more than just label cells. If GFP could be co-opted to ...reporter output was observed in their 293 cell culture system. In cells cotransfected with GFP and the GBPs,...expression was induced in ~76% of GFP+ cells, and 100% of DsRed+ cells also expressed GFP. Using AAV constructs...cortex, cerebellum, and spinal cord. Cre-DOG is also suitable for optogenetic studies, and since cells infected...fluorescent proteins as scaffolds for cell-specific gene manipulation.” Cell 154(4) (2013): 928-939. PubMed ...wanted to express a variety of proteins in single cell types in the mouse, but knew it would take years...could then selectively manipulate only GFP-labeled cells. Once Tang and Cepko found a description of GFP-...

  18. Fluorescent Biosensors for Measuring Autophagic Flux

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    Blog Post
    ...currently available from Addgene. Rosella autophagy biosensor Rosella is a dual-emission autophagy biosensor... autophagy, Rosella is targeted to the vacuole in yeast or the lysosome in mammalian cells. This decrease... and cytoplasmic Rosella. When fused with a mitochondria-targeting sequence, Rosella can be used to track...al. "Rosella: a fluorescent pH-biosensor for reporting vacuolar turnover of cytosol and organelles in yeast...process by which cytoplasmic material, including organelles, are targeted to lysosomes for degradation. Autophagy...provides limited information about what materials or organelles are being targeted for autophagy. The development...). In the absence of autophagy, the untargeted Rosella remains in the neutral pH cytoplasm where it emits...

  19. Viral Vectors 101: Optogenetic Tools

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    Blog Post
    ...pulses to the subject/cells expressing the optogenetic tool causing a change in cellular activity or gene ...receptors (GPCR) regulate cellular function through multiple intra-cellular signaling cascades. Optical... in the extracellular domain which activates the native signaling cascade of the intracellular part of...positively charged ions to rapidly pass through the cell membrane and initiate an action potential - a very...have developed many optogenetic tools to control cellular activity with exquisite precision using only light...both the membrane potential and a host of other cellular functions. Photoswitches are engineered molecules...such as Na+, K+, and Ca++ to passively enter the cell with the concentration gradient to depolarize it...

  20. Antibodies 101: Designing Your First Flow Panel

    Type
    Blog Post
    ...and inside the cells and are thus typically used for distinguishing live from dead cells. The combination...the chart tells us that PE and PE-Cy7 are "very bright" when they are excited by the yellow/green laser...say I am culturing HEK 293T cells in vitro. I transduced the cultured cells with a virus that encodes a...panel. Besides some background cell death constantly happening in cell culture, the transduction process... to some cell death. As a result, there is a high abundance of positively stained dead cells present and...When analyzing your cells using flow cytometry, you are typically measuring the presence or absence of...certain markers on the surface or the inside of your cells. While proteins themselves can emit intrinsic fluorescence...
Showing: 301 - 320 of 1043 results