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Showing: 301 - 350 of 812 results
  1. Using AAV for Neuronal Tracing

    Type
    Blog Post
    ...one side of the cell and released again at another side of the cell after intracellular transport without...via individual neurons. Neurons are composed of a cell body, with dendrites receiving incoming information...axon sending information onwards to other neuronal cells. Synapses at the terminals of axons form connections...connections to dendrites of proximal neuronal cells. In the specific example of episodic memory, a subset of... Anterograde tracing outlines neurons from their cell bodies to the terminals of their axons; while retrograde...direction, from the terminals of their axons to their cell bodies. Anterograde and retrograde tracing take...neuronal connectivity a large majority of neuronal cells are labeled overtime due to the continued replication...
  2. EXtracellular Plasmid RESource (EXPRESs) Consortium

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    Collection
    ...Consortium plasmids that encode the extracellular regions of cell surface receptor and secreted proteins...expression plasmids that encode the extracellular regions of cell surface receptor and secreted proteins...and Wright GJ Molecular & cellular proteomics 2010 Dec; 9(12):2654-65. A cell surface interaction network...The inserts that encode the whole ectodomains of cell surface receptors are flanked by two 8 bp cutting...microti blood stage proteins P. falciparum sporozoite cell surface and secreted proteins Mouse sperm Mouse ...screens or cellular assays to identify novel interactions or pathways that are important in cellular recognition...AVEXIS (for Avidity-based extracellular interaction screen) in which the extracellular regions of receptor ...
  3. Hot Plasmids Spring 2024

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    Blog Post
    ...with enrichment, single-cell sequencing, and optical pooled screens in human cells. Addgene offers vectors...reverse transcriptase enzymes, inhibition of host cell proteins, and modifications to the pegRNA. The Britt...shows enhanced editing efficiencies in a number of cell types at different genomic loci — in some cases,... editing efficiencies at different loci in U2OS cells. Image adapted from Yan et al. 2024 under a CC-BY...western blots (Figure 3).      Figure 3: HeLa cells transduced with SARS-CoV-2 nucleocapsid protein ...desirable than having many closely-packed labeled cells. Plus, Voltron2’s fluorescence is tunable by changing...Neuhaus Genetic modification of microglial immune cells is critical for central nervous system research;...
  4. CRISPR Activation: A Practical Guide

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    Blog Post
    ...differentiate induced pluripotent stem cells (Chavez et al., 2015) into neuronal cells by activating genes that cause...drug targets by finding genes that cause cell death in cancer cell lines upon activation (Gilbert et al.,...Repression and Activation. Cell 159:647–661 . https://doi.org/10.1016/j.cell.2014.09.029 Konermann S, Brigham...and Fluorescence Imaging. Cell 159:635–646 . https://doi.org/10.1016/j.cell.2014.09.039 Wong N, Liu W,... that over-express coding sequences from a given cell type or organism, have been used in a similar manner...many times, the isoform(s) common to a particular cell type are unknown or not readily available. By activating... et al., 2015)) are good choices across multiple cell lines (HEK293T, MCF7, U2-OS, Hela, N2A, 3T3) and...
  5. CRISPRainbow and Genome Visualization

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    Blog Post
    ...Genomic Loci in Living Human Cells by an Optimized CRISPR/Cas System.” Cell 155 (2013): 1379-1491. Pubmed...of 6 chromosome-specific loci in the U20S cancer cell line./ Each color represents a gRNA targeting a ...localization and movement of this locus in live cells! This technique was developed in the lab of Addgene...et al. to track telomere dynamics throughout the cell cycle. To optimize the signal to noise ratio of ...sophisticated tracking of multiple chromosomal loci in live cells. However, they note that certain improvements could...repression and genome editing. Ready to make your cells a little more colorful? CRISPRainbow is available...Multicolor CRISPR labeling of chromosomal loci in human cells.” Proc. Natl. Acad. Sci. USA 112(10) (2015): 3002...
  6. RANbodies: Reporter Nanobody Fusions

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    Blog Post
    .... RANbodies are expressed in 293T cells and are secreted from cells due to their IgGκ signal peptide sequence...-to tool for detecting a protein of interest in cells and tissues. Although antibody production is well... sequence, making them easy to harvest from cell culture media. Their His tags allow for further purification...RANBody While all three reporters stain cultured cells and tissue sections, some reporters are better suited... signal amplification of HRP Staining cultured cells and tissue sections Amplifying weak signals of fluorescent...Labeled anti-HA or -Myc antibody Staining cultured cells and tissue sections When detected with a labeled...Labeled Anti-Chicken IgY antibody Staining cultured cells and tissue sections Great for multicolor staining...
  7. Announcing the Winners of the 2021 Michael Davidson and Roger Tsien Commemorative Conference Awards

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    Blog Post
    ...sensitive GFP2 (roGFP2)-based biosensors for live cells. His work focuses on the enzyme hydropersulfide-... understand the processes that happen inside the cell,” says Pedre Pérez. Figure 2: Micrographs...Micrographs of the biosensor expressed in the human cell line, Hep3B. From left to right: Mitotracker Red, GFP...studies opioid use disorder. Her goal is to identify cell populations in the brain that contribute to the ...will explore the connectivity patterns of these cells and the functional contribution to a variety of ...administration and withdrawal to explore how these cells may encode the negative affect associated with drug...library of mutant sensors expressed in a mammalian cell line engineered to be electrically excitable. The...
  8. Viral Vectors 101: Calcium Sensors

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    Blog Post
    ... defined population of cells (e.g., a neuron subtype) and specific subcellular compartments for measurements...calcium concentrations and transients in living cells and organisms. Unlike chemical indicators, these...neuron-specific expression (hSyn promoter) and pan-mammalian cell expression (CAG promoter). An improved version named...neuron-specific, astrocyte-specific (GCaMP6 only) or mammalian cell expression, and compatible with constitutive or ...measure changes in calcium specific to the neuronal cell body or the axon (GCaMP6 only). The genetic elements...long-term expression and integration within the target cells, ensuring more consistent and reproducible results...calcium sensor to specific tissues or even distinct cell subtypes for efficient expression and downstream...
  9. Inntags: Innovative Protein Epitope Tagging

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    Blog Post
    ...that inntags IT5, IT6, and IT10 expressed well in cells and did not form undesirable aggregates. Using budding...tags. Impressively, IT6-GFP did not reduce yeast cell size or viability compared to untagged GFP overexpression...multiple other proteins. Again, little to no change in cell morphology was observed with IT5 and IT6 fusions...and HA tags had especially detrimental effects on cell size and growth rate, indicating that they compromised...correlation for protein localization in mammalian cells." Nature methods 10.4 (2013): 315-323. Pubmed PMID...
  10. CRISPR Antimicrobials

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    Blog Post
    ...reach essentially every cell or else small pools of antibiotic resistant cells could repopulate the environment...strategies are nonspecific - they harm any bacterial cell without a resistance gene, allowing resistant bacteria...antibiotics target one of three essential processes: cell wall synthesis, DNA replication, or protein synthesis...eliminated from the bacterium, which may also induce cell death. CRISPR also enables increased specificity...Treating a mixed population, represented here by cells of different colors, specifically targets bacteria...bacteria. Targeting a genomic sequence results in cell death. Plasmid targeting may result in plasmid loss...and antibiotic resensitization, or may also cause cell death. Image from Beisel et al., licensed under ...
  11. Minigenomes - a Safe Way to Study Dangerous Viruses Like the Ebola Virus

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    Blog Post
    ...choose cell lines that are highly transfectable.  The amounts of each plasmid transfected into cells are ... polymerase gene or using cells that stably express T7 (e.g. BSR T7/5 cells) (1). We hope that minigenomes...capable of being replicated and transcribed in the cell when the appropriate viral proteins are provided... RNA-dependent RNA polymerase into the infected cells. The EBOV polymerase replicates the viral genome...on separate plasmids and are co-transfected into cells alongside a plasmid encoding the minigenome. These...the minigenome) are efficiently transfected into cells. All of these components are necessary to efficiently... RNA polymerase also needs to be present in the cells to transcribe the viral mRNAs and minigenome. This...
  12. Cpf1: A New Tool for CRISPR Genome Editing

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    Blog Post
    ...orthologs that display cleavage activity in mammalian cells. Like Cas9 nucleases, Cpf1 family members contain...the PAM. With this information, they turned to a cell culture system to see if any Cpf1 nucleases would...would exhibit in vivo activity in mammalian cells. From 16 diverse Cpf1 candidates, Zetsche et al. found...particularly helpful for targeting non-dividing cells, which are difficult to modify through homology-... Cpf1 orthologs known to be active in mammalian cells, LbCpf1 and AsCpf1. In both reports, on target editing... (RNPs) failed to induce off-target editing in a cell culture model. The application of Cpf1 to genome...RNA-guided endonuclease of a class 2 CRISPR-Cas system." Cell (2015). PubMed PMID: 26422227. Find plasmids from...
  13. Fluorescent Protein Travel Awards - Protein Variants, a Serotonin Sensor, and an Artificial Leaf Replica System

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    Blog Post
    ...non-growing cells are orange, slow growing cells are orange-green, and fast growing cells are green. A...fluorescence. Cells expressing the library are then sorted by fluorescence-activated cell sorting into ...population. Last, Bernach will simultaneously monitor cell cycle and growth rate using TIMER and an unstable...reporter under the control of promoters that control cell cycle gene expression.  Additional Resources on...
  14. Building and Validating Recombinant Antibodies: A Case Study

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    ...cryopreserved hybridomas, immortalized cells created by fusing an activated B cell that produces the antibody of...of interest with a myeloma cell. This RNA was then used to generate cDNA, which  was used as a template...of hybridoma generated mAbs is that if the frozen cell line becomes non-recoverable, the stock of the mAb...hybridoma stocks, without having to grow up the cells. This RNA could then be used to generate functional...immunofluorescence-immunocytochemistry (IF-ICC.) This method was chosen because cells transfected with a plasmid to express the target... could be screened in a high-throughput manner. Cells were labeled with both a hybridoma generated mAb...
  15. Hot Plasmids - January 2023

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    Blog Post
    ...mCherry for FACS sorting of the weaponized T-cells (CAR-T cells) - and then delivering them to a tumor - ...effectively as standard CAR-T cells, but it reduces the off-target effects caused by T cell migration.  CAR expression...reducing the on-target off-tumor activity of CAR–T cells was recently devised by the Yingxiao Wang lab.  ...above can be made for expressing your favorite T-cell receptor, or perhaps any other tool that can benefit...  Wu Y, et. al. Control of the activity of CAR-T cells within tumours via focused ultrasound. Nat Biomed...
  16. 5 Great Apps for Lab Life

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    Blog Post
    ...’re saving trees! The Earth thanks you. 2. Gibco Cell Culture by Gibco Whenever I start to learn a new...spectrometry app. I digress. When I started learning proper cell culture technique, I tried to find an app that could...calculations. This is how I came across the Gibco Cell Culture app. Gibco organizes its app into four categories...tools are a lifesaver when your research requires cell culture and include a counter, lab timer, dilution...educational section. This section holds the Gibco Cell culture manual and basic instructional videos. The... Overall, it’s a great tool for someone starting cell culture work. 3. NEB Tools by New England BioLabs...alternative, similar apps: Findings Lab Notebook Cell Culture Split Calculator by DRDP Restriction Enzyme...
  17. Qi Lab CRISPR Page

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    ...transiently transfected cells. Co-expression of both plasmids in HEK293 cells could cause up to 2~3-fold...Weissman JS, Arkin AP, Lim WA. Cell . 2013 Feb 28;152(5):1173-83. doi: 10.1016/j.cell.2013.02.022. PubMed PMID...JA, Lim WA, Weissman JS, Qi LS. Cell . 2013 Jul 9. doi: 10.1016/j.cell.2013.06.044. PubMed PMID 23849981...expression of arbitrary genes in bacteria or human cells ( Qi et al. ). This CRISPR interfering system (CRISPRi...optimized dcas9 gene under the control of Murine Stem Cell retroVirus LTR promoter. The second plasmid ( pgRNA_humanized...(CRISPRi), works independently of host cellular machineries, requiring only a nuclease-deficient Cas9 ...
  18. Optogenetics Plasmid Collection

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    ... optical switch tools to measure and manipulate cells and their biomolecular processes....to blue light and allows cations to flow into the cell. Variants of channelrhodopsin have been engineered...improve the expression and membrane targeting in host cells. Other microbial opsins, such as the Halorhodopsins...actively move cations or anions into or out of the cell. When using these opsins as a tool to control neuronal...plasmids that use light to control a protein or cellular activity. For example, search "Cdc42", "transcription...
  19. Four Ways to Package Transgenes That Exceed the Size Limit of Adeno-associated Virus

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    Blog Post
    ...human T cells and hematopoietic stem and progenitor cells (HSPC)s to ~40% expression in the K562 cell line...gene to airway epithelial cells in mice. This vector transduced ~10% of cells, similar to the transduction... then independently packaged into an AAV. When a cell is co-infected with both part A and part B AAVs,... always.  The combination of serotype and tissue/cell type could have a big impact on the rate of transgene...since both of these variables influence whether cells will be co-transduced with multiple copies of both... followed by the 3’-end of the transgene. When a cell is transduced by both viruses, if the AAV genomes...optimal sequences, the group achieved ~80% of muscle cells expressing mini-dystrophin.  3. Hybrid  Overview...
  20. CRISPR 101: Drug discovery and CRISPR

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    Blog Post
    ...knock out, etc. – CRISPR can be used to generate cell line or animal models which have the precise disease...Since CRISPR has been adapted for use in primary cells, many tissue types, and across species, it enables... phenotype. CRISPR can also be used to generate cell line knock-ins of patient mutations which are variants...CRISPR has revolutionized the generation of knockout cell lines which has made this control step extremely...in a cancerous background and treat the parental cell line and the X knockout with your drug(s). If a ...the Addgene blog CRISPR 101: Making a Knock-In Cell Line Using CRISPR-Cas9 to Edit Disease Out of the...
  21. Top Requested Plasmid of 2017 - pMD2.G

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    Blog Post
    ...used to deliver Cas9 and other genes to mammalian cells. For this reason, the top requested plasmid of 2017... coat the virus and help determine the types of cells that it can infect. The VSV-G envelope is widely... lentiviruses to infect many different types of cells. This means researchers who use VSV-G can deliver...deliver their genes of interest to a variety of cells and study their effects. To date, nearly 900 articles...in studies of the secretome, ubiquitin ligase, cellular senescence, autophagy, CRISPR, and so much more...
  22. Quick Guide to Near-Infrared Fluorescent Proteins

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    Blog Post
    ...mammalian cells. dDetermined as effective NIR fluorescence in transiently transfected live HeLa cells with ...Near-Infrared Fluorescent Proteins in Mammalian Cells. Cell Chem Biol 24, 758-766 e753 (2017). Baloban, M...developers and users, BV is present in eukaryotic cells as an intermediate of heme metabolism (Shemetov ...to GFP-like probes by supplying a single gene to cells. Still in bacteria, which do not produce BV, an ... to consider effective brightness of NIR FPs in cells, in addition to their molecular brightness (a product...the concentration of BV-containing molecules in a cell and depends on the efficiency of BV incorporation...Photo-stabilityc, t1/2, s pKa Brightness in HeLa cells vs. iRFP713, % d Ref BphP-based FPs miRFP670...
  23. Measuring Kinase Activity at the Single-Cell Level with Kinase Translocation Reporters (KTRs)

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    Blog Post
    ... the single-cell level can aid in drawing connections between signaling activity and cell phenotype. One...Covert, M.W. (2018). Live-cell measurements of kinase activity in single cells using translocation reporters... One method for monitoring live single-cell kinase activity is FRET, but FRET reporters are challenging...their Kinase Translocation Reporters (KTRs) whose cellular localization serves as a proxy measurement of ... used to measure kinase activity in specific subcellular compartments. Second, because KTRs shuttle between...
  24. Visualizing Protein Turnover In Situ

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    Blog Post
    ...proteins in cells. Homeostatic regulation of protein abundance is essential for normal cell function, and...one particular protein in neurons or in any other cell type. However, we cannot distinguish new from old...facilitate the visualization of specific proteins in cells. Tagged protein can easily be overexpressed from...techniques to follow translation in living single cells. However, before CRISPR-Cas9 these techniques were... turnover of specific endogenous proteins in any cell type. Exciting! Many thanks to our guest blogger... how small molecule fluorophores can be used for cell labeling Check out other protein tagging strategies...interests, suspected to interact, are added to a cellular sample. Both antibodies have a short antibody ...
  25. Viral Vectors 101: Biosensors

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    Blog Post
    ...type of cells the viral particles infect. This can direct your biosensor to specific tissues or cell (sub...the caffeine of the cell!)—ATP. There are biosensors for intracellular, extracellular, and even the ADP:...blog we will focus on those which can be applied in cell culture and animal models primarily. Fun fact: Almost...vivo, in tissue preps, in multiple species, and in cell culture models. Some of them have even been expanded... as actinin. When tension is high vs. low in the cell the donor and acceptor of a FRET pair on actinin...many biosensors need to be in specific tissues or cells to monitor their target analyte. This can be difficult... as proxies for a cellular process or directly measure a cellular process. Cellular phenomena such as ...
  26. CRISPR 101: Non-Homologous End Joining

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    ...Translocations in Human Cells Are Generated by Canonical Nonhomologous End-Joining. Molecular Cell 55:829–842 . ...Genome Editing Specificity. Cell 154:1380–1389 . https://doi.org/10.1016/j.cell.2013.08.021 Waters CA, Strande... chromosomal DSBs. It is important to know that cells possess two major repair pathways – Non-Homologous... steps Unlike HDR, NHEJ is active throughout the cell cycle and has a higher capacity for repair, as there...should take less than an hour, thus a population of cells constitutively expressing a targeted Cas9 should...CRISPR Protocol for Genomic Deletions in Mammalian Cell Lines [Video] Pooled CRISPR Libraries Offer Genome-Wide...
  27. Lentiviral Prep Service

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    ...barcodes to combinatorially index cells for single-cell analysis of clonal dynamics. This library expresses...carrying version 1 of the CellTag barcoding library. Version 1 of the Celltag library contains 19973 barcodes...carrying version 2 of the CellTag barcoding library. Version 2 of the Celltag library contains 4934 barcodes...carrying version 3 of the CellTag barcoding library. Version 3 of the Celltag library contains 5737 barcodes...Libraries ID Name Description PI 115643 Morris CellTag Barcode Library Version 1 Ready-to-use lentiviral...
  28. Caltech Systemic Capsids

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    ...then cell type. For CNS: For infant rhesus macaques: Broad tropism - AAV.MaCPNS1, AAV.MaCPNS2 Cell type-biased...tropism - AAV.CAP-B22 Cell type-biased: Neurons - AAV.CAP-B10 Brain vascular cells - AAV.CAP-Mac For rats...tropism - AAV-PHP.eB Cell type-biased: Neurons - AAV.CAP-Mac Brain vascular cells - AAV9-X1.1, AAV1-X1...including: the delivery method, mouse strain, target cell type or tissue of interest, and model organism under... above helps you choose the best capsid for your cell type. First, do you want to target CNS ...Broad tropism - AAV-PHP.eB, AAV-PHP.AX, AAV-PHP.eC Cell type-biased: Astrocytes - AAV-PHP.AX with GRE or...AAV-PHP.eB with GRE or transgenic animal Brain vascular cells - AAV9-X1.1, AAV1-X1 Neurons - AAV.CAP-B10, AAV-...
  29. Live and Let Dye: Self-Labeling Protein Tags

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    Blog Post
    ...Bewersdorf, J. (2016). Two-colour live-cell nanoscale imaging of intracellular targets. Nature Communications,...opening up new applications.   Figure 1: Live-cell labeling strategies. The green structure represents...organelle interactions. a) Labeling scheme. b) COS-7 cell ER labeled with Halo-Sec61β with SiR-CA (magenta...viral particles with BG-linked antibodies to drive cell type-specific delivery of a viral vector (Strebinger...specialized ligands is more expensive than letting the cells make a fluorescent protein for you. And some ligands...certain probes are not very good at crossing the cell membrane. So, you should investigate your options...Microscopy: A Comparison between HaloTags and SNAP-tags. Cell Chemical Biology, 26(4), 584-592.e6. https://doi.org...
  30. Hot Plasmids and Viral Preps - May 2021

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    ...infects host cells through binding the human angiotensin converting enzyme 2 (ACE2) cell-surface receptor...antigenic drift.    Starr et al Cell. 2020. https://doi.org/10.1016/j.cell.2020.08.012  Starr et al Science...Library generation and sequencing. From Starr et al Cell., 2020. (B) Mapping antibody-escape mutations with... SARS-CoV-2 spike RBD is displayed on the yeast cell’s surface. The Bloom lab used the library to identify... candidates were validated by IP-MS using HEK293 cell lysate where the antigens would be in their native...immunoprecipitate the entire complex in three different cell lines. The Gräslund lab plans to continue their ...protect proteins from unfavorable interactions in the cell, improving biosynthetic pathway yields by stabilizing...
  31. Sonic Hedgehog? Sleeping Beauty? Learn About the Genes Behind Addgene’s Conference Room Names

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    ... are filled with early mitotic cells as well as necrotic or dead cells (Jiang and White-Cooper, 2003)....interact with each other to generate forces that cause cells and muscles to contract depending on the context...context. Contraction is critical for processes such as cell movement/motility, development, cytokinesis, and...scientists who discovered comr thought the sperm cells in mutant flies looked like a “whole bunch of cookie...are part of a genetic cascade that determines the cell fate of the dorsal mesoderm in developing Drosophila... and bagpipe: two homeo box genes that determine cell fates in the dorsal mesoderm of Drosophila." Genes...required for oogenesis in Drosophila." The Journal of cell biology 139.7 (1997): 1805-1819. PubMed PMID: 9412474...
  32. Tips for CRISPR Gene Editing in Mice

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    ...expanded since its adaptation for use in mammalian cells in 2012-2013. Researchers are now using this system...plasmids containing sgRNA sequences into HEK293T cells. The fluorescence intensity was classified into ...is then a simple matter of transfecting HEK293T cells with your modified pCAG-EGXXFP plasmid along with...incubation, you assess the level of fluorescence in your cells under a fluorescence microscope. The higher the ...you’ve validated your gRNAs for use in mammalian cells, it’s time to use them in mouse embryos. When researchers...developed as the use of CRISPR/Cas9 in mammalian cells was being explored and it allowed control over each... the mutation will be homozygous for it in every cell; however, if the microinjection was done as the ...
  33. Antibody Production

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    Collection
    ...mammalian expression vectors, human embryonic kidney cells are transfected with the plasmid(s) encoding the.... This buffer is not compatible for use in live cells and will interfere with conjugation. For applications...antigen is first transiently expressed in mammalian cells. To learn which specific QC experiments were performed...email [email protected] . Immunocytochemistry (ICC) Cells are fixed and labeled with the antibody and a species-specific...Western Blotting (WB) Proteins are extracted from cells, separated by SDS-PAGE, transferred to a membrane...
  34. Antibody Plasmid Collection

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    Collection
    ...expressing these in bacteria, mammalian cells, yeast, plants, or insect cells. Benefits include consistency between... research purposes include animals or hybridoma cells, but are difficult to generate due to expense and...monoclonal antibodies (R-mAbs) expressed in mammalian cells. Monoclonal antibodies are derived from an individual...transiently transfected into mammalian tissue culture cells, the R-mAbs are secreted into the culture media ...
  35. Rewiring Metabolic Circuitry with CRISPR RNA Scaffolds [Video]

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    ...coordinated by the eukaryotic cell for the execution of many complex cellular behaviors, such as differentiation...toxic intermediate buildup as well as controlling cell fate decisions. By using an orthogonal dCas9 protein...for sequence-specific control of gene expression. Cell, 152(5), 1173-1183. (2013). PubMed. Zalatan, J...Transcriptional Programs with CRISPR RNA Scaffolds. Cell, 160(1), 339-350 (2015). PubMed. Find the Plasmids...crispr/qi/ Plasmids described in  Zalatan et al. Cell  (2015) can be found here: https://www.addgene.org.../article/9593/ Plasmids described in Qi et al. Cell  (2013) can be found here: https://www.addgene.org...or metabolism. Our attempts to manipulate these cellular behaviors often fall short with the generation...
  36. Hot Plasmids: FRET-Based Biosensors

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    ... there is one problem: how to get that into the cells of interest,” Griesbeck said. Because they are chemical...advantage for observing events taking place inside cells that are on the move, such as T lymphocytes. Griesbeck...-binding protein, troponin C (TnC), from muscle cells. They identified a toadfish TnC variant which had...cAMP-responsive element-binding protein (CREB) in living cells. “Now we are making this really good,” Griesbeck...also present challenges in that they are found in cells at much lower concentrations than calcium, requiring...Friedrich et al. Imaging CREB activation in living cells. J Biol Chem. 2010 Jul 23;285(30):23285-95. doi:...understand the connection between molecular- and cellular-level events and behavior. It’s a problem that...
  37. Multiplex Genome Editing with CRISPR-Cpf1

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    ...expression and needing to work with a transfectable cell line. 2) They require larger expression vectors... of 4 crRNAs in vitro and when expressed in 293 cells. This allows for a single promoter to drive expression... were used.  With transfection, 6.4% of HEK293T cells had edits at 4 of 4 targets when an array of 4 crRNAs...transfected on a single plasmid. This is versus 2.4% of cells transfected with a pool of plasmids that contained...processing of the crRNA array when expressed in cells, but notice how Zetsche et al reverses the orientation...mouse neurons and in vivo. For these experiments, cells were infected with a 1:1 ratio of two AAVs,  one...RNA-Guided Endonuclease of a Class 2 CRISPR-Cas System. Cell,163(3), 759-771. PubMed PMID: 26422227. PubMed Central...
  38. RNA Extraction Without A Kit

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    Blog Post
    ...are commonly found in cells, and without something to block RNase activity upon cell lysis, RNA is degraded...RNases such as RNaseZAP. When harvesting tissues, cells, plants, fungi, or bacteria, keep samples cold and...before RNases had a chance to break down RNA upon cell lysis.  In the late 1970’s, Chirgwin and colleagues...keeping your samples cold until homogenization and cell lysis. This can be challenging depending on your...developed ways to “stabilize” RNA within tissues before cell lysis. These products, namely RNAlater®  from Thermo...solutions that work by inhibiting RNase activity within cells or tissues- they don’t actually chemically stabilize...
  39. CRISPR Plasmids - Mammalian Expression

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    ...sequence. DSBs are preferentially repaired in the cell by non-homologous end joining (NHEJ), a mechanism...PAM site. When a repair template is present, the cell may repair a DSB using homology-directed repair ... time and are potentially heritable in dividing cells. ID Plasmid Gene/Insert Selectable Marker PI Publication...DNA. Type VI enzymes that function in mammalian cells can be used to attentuate RNA levels. In mammalian...genomic loci using fluorescent microscopy in living cells. Design your gRNA sequence to direct the dCas9-FP...Cas protein and a target-specific gRNA in the same cell at the same time. Single plasmids containing both...
  40. Isolating Genomic Regions of Interest with the CRISPR System

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    Blog Post
    ...used. The Fujii lab demonstrated this in mammalian cells by expressing dCas9 with an N-terminal 3xFLAG tag...studies (Fujita et al., 2018). In addition to the "in cell" form of this method, in which an engineered DNA-binding...molecule such as the CRISPR complex is expressed in cells to be analyzed, the Fujii lab also developed another...recombinant CRISPR ribonucleoproteins." Genes to Cells 21.4 (2016): 370-377. PubMed PMID: 26848818. Fujita...‐dC as9 protein for enCh IP analysis." Genes to cells 23.4 (2018): 318-325. PubMed PMID: 29480524. Gilbert...RNA-guided regulation of transcription in eukaryotes." Cell 154.2 (2013): 442-451. PubMed PMID: 23849981. PubMed...of chromatin interactions by biotinylated dCas9." Cell 170.5 (2017): 1028-1043. PubMed PMID: 28841410. ...
  41. Mesothelioma - Causes, Symptoms, and Treatment

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    ...if the cell dies from injury, this protein leaks out into the cytoplasm, migrates out of the cell, and ...Keytruda) causes T-cells to more easily recognize and cause the destruction of cancer cells. Pembrolizumab...cause inflammation, which can cause mesothelial cells to mutate and ultimately form cancerous tumors.  ...resection), systemic chemotherapy to kill cancerous cells that may have spread beyond the point of origin,...successful in killing many (if not all) of the cancer cells that may be left behind after surgery, while being...and binds cells that can begin an immune response. This important biomarker can be used to distinguish between...
  42. Tips for Screening with Yeast Two Hybrid Systems

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    Blog Post
    ...entire proteome of a particular cell type, or a subset based on a cellular compartment or growth stage)....extensively to screen for molecular interactions in the cell, including protein-protein, protein-DNA and protein-RNA...field of eukaryotic transcriptional activation and cell biology. During this period, proteins were successfully...The reporter gene then allows detection of those cells where binding between the proteins of interest has...alternative fungi (C. albicans, pC2HB) (7) and mammalian cells. If the problem is that your proteins are not post-translationally... DNA and activate a reporter gene in eukaryotic cells, fusion proteins must gain access to the nucleus... the DNA specificity of a prokaryotic repressor. Cell. 1985; 43:729-736. PubMed PMID: 3907859. 4. Fields...
  43. NETRF

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    Collection
    ... Modeling Neuroendocrine Tumors Using Adult Stem Cell-Derived Organoids Matthew Meyerson Dana-Farber Cancer...Institute Epigenetic Regulators of Intestinal Endocrine Cells and Carcinoid Tumors Qiao Zhou Harvard University...University Epigenetic Regulators of Intestinal Endocrine Cells and Carcinoid Tumors Bradley Bernstein Broad Institute...
  44. Hot Plasmids: Summer 2024

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    Blog Post
    ...epigenome editing. Cell, 184(9), 2503–2519.e17. doi: https://doi.org/10.1016/j.cell.2021.03.025.    Recombinant...tissue is identifying the cells you are studying. Antibodies can help reveal cellular identities by targeting...particles (eVLPs) offers an option to transduce cells directly with ribonucleoprotein cargo. eVLPs contain... will only be transiently present in transduced cells, limiting off-target editing. Cargo size limits ...site-specific integration of large genes in mammalian cells via continuously evolved recombinases and prime ... Recombinant antibodies for marking cell types in the nervous system By Ashley Waldron The mammalian nervous... nervous system is composed of myriad cell types and subtypes, and a familiar challenge for anyone who...
  45. Plasmids 101: Repressible Promoters

    Type
    Blog Post
    ... by ~3,300-fold in Drosophila cells and ~24,000-fold in human HeLa cells as compared to basal expression...origins, Tet systems function well in mammalian cells, and TRE-containing promoters can be used in the...cumate switch system functions well in mammalian cells, and can be used in the repressible manner described...While originally developed for use in mammalian cells, this system has also been implemented in a variety...transgene permits directed expression of that gene in cells that also express GAL4. Usage of this system revolutionized...reversible by the addition of quinic acid to Drosophila cells. Work by Wei et al. from Kang Shen’s lab has also.... Tight control of gene expression in mammalian cells by tetracycline-responsive promoters. Proc Natl ...
  46. CRISPR Pooled gRNA Libraries

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    Collection
    ...experiment, target cells are treated with the pooled library to create a population of mutant cells that are then...quantities of cells and therefore, may not be suitable for use when the number of cells is limited (e....ribosomal, cell cycle) 51043 — 51048 Knockout Human Sabatini and Lander 3rd 10 Varies FNLCR CRISPRa Cell Surface...e.g. primary cells). Most CRISPR libraries require the use of lentivirus to deliver the gRNA/Cas9 to target... target cells. Therefore, you must be equipped and authorized to use lentivirus in your lab. Once you ...organism, and the library is only compatible with cells derived from that organism. All of our current pooled...140219 Knockout Human J. Chen 3rd 10 4,530 Murine Cell Surface Protein Knockout (McspKO) Library 200445...
  47. Zhang Lab CRISPR Page

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    ...genome editing in mammalian cells (Cong et al ., Science 2013, Ran et al ., Cell 2013, Ran et al ., Nature...Matoba S, Zhang Y, Zhang F. Cell . 2013 Sep 12;154(6):1380-9. doi: 10.1016/j.cell.2013.08.021. Epub 2013 Aug...Feng G, Sharp PA, Zhang F. Cell . 2014 Oct 9;159(2):440-55. doi: 10.1016/j.cell.2014.09.014. Epub 2014 Sep...CRISPR/Cas system can be implemented in mammalian cells by co-expressing the S. pyogenes Cas9 (SpCas9) nuclease...cloning. GFP-KASH fusion facilitates FACS sorting of cells and nuclei. Return to top AAV - Cas9 mouse CRISPR-Cas9...constitutively expressing Cas9 knockin mice (Platt et al ., Cell 2014). In these mice the CRISPR-Cas9 system can ...recombination and fluorescence assisted sorting of cells and nuclei in addition to sgRNA expression. This...
  48. Fluorescent Proteins 101: GFP Fusion Proteins - Making the Right Connection

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    ...proteins enable the observation of proteins in living cells and organisms. Both components of the chimera are...However, these may not reflect the situation in cells. Therefore, the localization of critical fusions...currently the standard for assessing oligomerization in cells. In addition to measuring stickiness, several researchers...fluorescent proteins that behave as monomers in mammalian cells include: mTurquoise2, mEGFP, mNeonGreen, mScarlet...protein to the existing pool of protein within a cell and may lead to over-expression artifacts. This ...heterotrimeric G protein Gq activation in living cells." BMC biology 9.1 (2011): 32. PubMed PMID: 21619590...activation of heterotrimeric G-proteins in living cells." Science 291.5512 (2001): 2408-2411. PubMed PMID...
  49. Simple CRISPR-based Epigenetic Editing: dCas9-directed DNA Demethylation

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    ...its oxidized derivatives. Cell 152, 5 P1146-1159. https://doi.org/10.1016/j.cell.2013.02.004.  Xu X, Tao...targeted DNA demethylation. Cell Discov 2, 16009. https://doi.org/10.1038/celldisc.2016.9.   ...enzymatic activity cause demethylation?  Dividing cells depend on DNA methyltransferase 1 (DNMT1) to copy...methylate sites blocked by dCas9. Within a few rounds of cell division, the original methylated strand is diluted...dCas9 expression and pLM-CMV-R-Cre. Selection for cells stably and highly expressing these constructs can...can be achieved by fluorescence-activated cell sorting, and stable gRNA expression can be achieved using...TETs compete with DNMT3 activity in pluripotent cells at thousands of methylated somatic enhancers. Nat...
  50. Scientists Map the SARS-CoV-2-Human Interaction Network

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    ... used HEK293T cells in our first study, but we're planning to soon expand to other cell types, including...26 of the 29 SARS-CoV-2 viral proteins in human cells and used these viral “bait” proteins to fish for...human proteins that the virus interacts with in cells. Because viruses rely on the help of human proteins...monkeywrench into the virus’ hijacking of human cells. Even better, more than half the drugs hitting these...they have an IRES-Puro marker to facilitate stable cell clone selection. Expression is driven by a fairly...
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