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  1. The Power Behind NGS Plasmid Validation: seqWell

    Type
    Blog Post
    ...barcodes. Rather than continuing to process 100s to 1000s of samples individually, plexWell™ reduces every...advances in technologies that permit large-scale creation and synthesis (“writing”) of longer pieces of ...limited by costly library prep, as each sample requires an individual library. The plexWell™ workflow ...samples from several plates are pooled together to create a single library containing fragments carrying ...
  2. Antibodies 101: ChIP

    Type
    Blog Post
    ...pieces of roughly equal size, typically between 200-1000 bp. This is to ensure that your downstream analysis...could mean needing to increase crosslinking to counteract the effects of increased sample agitation; a ...such as qPCR or next-gen sequencing. ChIP is an incredibly useful application for exploring these interactions...crosslinking, which uses formaldehyde or UV light to create strong but reversible bonds. This will keep the... necessary for most ChIP experiences, but the increased binding can mask the epitopes antibodies recognize...provides a truly random digestion, but is harsher and requires more optimization. Enzymatic digestion, while ...shorter sonication time could be an opportunity to decrease crosslinking. (Homogenization for a tissue sample...
  3. Visualizing Protein Turnover In Situ

    Type
    Blog Post
    ...proximity ligation." Nature methods 3.12 (2006): 995-1000. PubMed PMID: 17072308.  4. Dieck, Tom, et al. "...neurodegeneration. The level of this protein is decreased in Alzheimer’s disease patient’s brains. However... of radioactive materials is highly regulated, requires designated work areas and come with health risks...
  4. Tips for Titering Your Lentiviral Preps

    Type
    Blog Post
    ...particles. Studies have found that values can be 10-1000 fold higher than for functional assays depending.... Developing the proper control line typically requires transducing with a limiting multiplicity of infection... How Lentivirus is Used in CRISPR Genome-Wide Screening Learn How Lentivirus Has Been Used for Lineage...
  5. Plasmids 101: The Promoter Region – Let's Go!

    Type
    Blog Post
    ... (response elements). Promoters are about 100 to 1000 base pairs long and found upstream of their target...interest is toxic. To combat this, scientists have created synthetic promoters, which typically include some...binding sites, commonly used in Drosophila Specific Requires the presence of Gal4 gene to activate promoter...Promoter from T7 bacteriophage Constitutive, but requires T7 RNA polymerase. When used for in vitro transcription... Negligible basal expression when not induced. Requires T7 RNA polymerase, which is also controlled by...Promoter from Sp6 bacteriophage Constitutive, but requires SP6 RNA polymerase. SP6 polymerase has a high ...with somewhat weak expression. lacIq mutation increases expression of the repressor 10x, thus tightening...
  6. Which Fluorescent Protein Should I Use?

    Type
    Blog Post
    ...coefficient and quantum yield of the protein, divided by 1000. In many cases the brightness is compared to that...many FPs (particularly those derived from GFP) requires oxygen. Therefore, these FPs cannot be used in... the time it takes the FP to correctly fold and create the chromophore. This can be from a few minutes...
  7. Overcoming the AAV Size Limitation for CRISPR Delivery

    Type
    Blog Post
    ...includes SpCas9, and shortern orthologs approximately 1000 amino acids in size. From the pool of shorter orthologs...and multiple gRNAs into separate AAV vectors, increasing overall packaging capacity but necessitating ...drawbacks limit the utility of these systems: St1Cas9 requires a very specific PAM sequence that limits the number...efficiency of AAV-SaCas9 in vivo, the Zhang lab created an all-in-one SaCas9 and sgRNA construct using ...histologically normal and liver injury markers were not increased compared to a control AAV-GFP. Not only did the...
  8. Control AAV Preps

    Type
    Collection
    ... Flp-dependent Cre and Flp-dependent Cre, Flp, and VCre-dependent Constitutive (non-cre-dependent) Clear...dTomato Cre dependent 1, 2, 5, 9, rg* Fishell 100043 pAAV.synP.DIO.EGFP.WPRE.hGH Syn EGFP Cre dependent...None Other Cre-dependent color switch Brainbow constructs Spaghetti monster tags Activity Cre-dependent...EF1a EYFP Cre dependent 1, 2, 5, 9, rg* Deisseroth 28306 pAAV-FLEX-tdTomato CAG tdTomato Cre dependent...nls-EGFP Cre dependent 1, 2, 5, 8, 9, rg* Harvey 131002 pAAV-Ef1a-DIO mScarlet EF1a mScarlet Cre dependent... hSyn EGFP Cre dependent 1, 2, 5, 8, rg* Roth 50459 pAAV-hSyn-DIO-mCherry hSyn mCherry Cre dependent 1...pCAG-FLEX-EGFP-WPRE CAG EGFP Cre dependent 1, 2, 5, 8, 9, rg* Zeng 59331 pAAV-CAG-FLEX-EGFP CAG EGFP Cre dependent 1 Wickersham...
  9. Optogenetics AAV Preps

    Type
    Collection
    ...Blue-wavelength fluorescent protein Activity Cre dependent Flp dependent Cre and Flp dependent Constitutive Serotype...CAG Arch GFP Cre dependent 1, 9 Boyden 28305 pAAV-FLEX-ArchT-tdTomato CAG ArchT tdTomato Cre dependent 5...eNpHR EYFP Cre dependent 9 Deisseroth 26966 AAV-Ef1a-DIO eNpHR 3.0-EYFP EF1a eNpHR 3.0 EYFP Cre dependent...soma-targeted) FusionRed Cre dependent 5 Yizhar 109048 pAAV-CAG-DIO-NLS-mRuby3-IRES-eGtACR1-ST CAG eGtACR1...soma-targeted) mRuby3 Cre dependent 9 Adesnik 137155 pAAV-nEF-Con/Fon-iC++-EYFP nEF iC++ EYFP Cre and Flp dependent...eOPN3 mScarlet Cre dependent 1, 5 Yizhar 139504 pAAV-CAG-DIO-PPO-Venus CAG PPO Venus Cre dependent 5 Bruchas...PHPeB Dimidschstein 100061 pAAV-Ef1a-DIO C1V1 (t/t)-TS-mCherry EF1a C1V1 (t/t) mCherry Cre dependent 9 Deisseroth...
  10. Neurodegeneration Plasmid Collection

    Type
    Collection
    ...61727 mCherry-Parkin-IRES-zeo PRKN mCherry Parkinson's Stephen Tait 61728 YFP-Parkin-IRES-zeo PRKN YFP Parkinson's... pAAV-AICD-NLS-IRES-hrGFP APP CMV Alzheimer's Hélène Marie 107544 pAAV-AICD-NES-IRES-hrGFP APP V5 CMV...pLV-EF1a-KIF5A-HA-IRES-Puro KIF5A HA eF1a ALS Rosalind Segal 166953 pLV-EF1a-KIF5AR280H-HA-IRES-Puro KIF5A HA...171786 MSCV-Fbxo7-IRES-GFP FBXO7 GFP Parkinson's Heike Laman 171787 MSCV-Fbxo7(ΔF-box)-IRES-GFP FBXO7 GFP...Lenti-sgAtm#1/Cre ATM CMV Ataxia telangiectasia Charles Swanton 173580 Lenti-sgAtm#2/Cre ATM CMV Ataxia... pAAV-hSyn-GFP-IRES-mSNCA SNCA GFP hSyn Parkinson's Jun Ding 185715 pAAV-hSyn-GFP-IRES-hSNCA SNCA GFP ...pAAV-hSyn-GFP-IRES-mSNCA(1-95) SNCA GFP hSyn Parkinson's Jun Ding 185717 pAAV-hSyn-GFP-IRES-hSNCA (A11P/...
  11. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

    Type
    Blog Post
    ...Low 572/ 610 FP595 Tetramer Green Dark/ Red 70 - 1000 Medium 590/ 600   Choosing a photoactivatable...photoconverts predominantly to the anionic form, causing increased fluorescence when excited with 488nm blue light...which allows PA-GFP to exhibit up to a 100-fold increase in fluorescence when illuminated with blue light...performing several rounds of random mutagenesis screening for enhanced RFP variants. PA-mCherry (E26V / ...one since the formation of mEosFP’s chromophore requires a temperature below 30°C and this is not ideal...photoswitching. In 2008, scientists used mutagenesis screens to find a version of Dronpa that doesn't become...the absence of photoactivation resulting in an increased signal to noise ratio. PA-FPs with higher contrast...
  12. CRISPR 101: Multiplex Expression of gRNAs

    Type
    Blog Post
    ... E. coli.” ACS Synthetic Biology 4(9) (2015):987-1000. PubMed PMID: 25822415. Find plasmids from this...plasmid contains all of the desired gRNAs. This increases the chance that all the edits you want to make... cleave outside of their recognition sequence, creating flanking overhangs. These overhangs can be customized...Expression Systems (MuLE) Kit: This kit can be used to create lentiviral vectors expressing wt humanized Cas9...the gRNAs. gRNAs are flanked by glycine tRNAs to create polycistronic glycine tRNA-gRNA (PTG) constructs...using 3 distinct spacer-repeats, you could easily create 7 unique arrays (e.g. for spacers A, B, and C, ...is possible with efficiency >70%. CRMAGE is an incredibly fast protocol, with only 5 hours incubation time...
  13. Popular Retroviral Vectors and Their Uses in Scientific Research

    Type
    Blog Post
    ... Mammalian shRNA Tools for RNAi! Cre-Lox technology CAG-GFP-IRES-CRE (Plasmid #48201) This retroviral ...vector from the Gage lab encodes GFP and Cre-recombinase. The Cre-lox system is a technology that can be...the pLKO.1 vector can be found here. Cre-Lox technology Puro.Cre empty vector (Plasmid #17408)   This ...of mouse transgenics. Experimental uses include: Cre-dependent gene expression, gene knockout, and selection... vector deposited by Dr. Tyler Jacks. It carries CRE recombinase and a puromycin resistance cassette. ...shRNA), mutation/editing (CRISPR-Cas9) or deletion (Cre), together with expression of fluorescent or enzymatic...CRISPR pooled libraries that allow functional screening of thousands of genes in genome-wide experiments...
  14. Antibody Guide

    Type
    Collection
    ...sonication to break DNA up into fragments of 300-1000 bps in length. Note: This sonication process may...cytometry requires a negative control, a small subset of the sample with no antibodies. It also requires single-antibody... cell cultures using hybridomas, cell cultures created by fusing B cells with myeloma cells (immortalized...immortalized B cells). The genetic reorganization that creates variety in the antibody allowing for their extreme...animals immunized as described above are used to create hybridomas, which produce large amounts of a single...recombinant antibodies. Recombinant antibodies are created by cloning antibody genes from specific hybridoma...goes through a randomized reorganization process, creating a unique binding site. This process, known as ...
  15. Penn Vector Core Partnership with Addgene

    Type
    Collection
    ...pAAV.CMV.HI.eGFP-Cre.WPRE.SV40 Cre Recombinase James M. Wilson AV-9-PV2394 107788-AAV9 AAV.rTH.PI.Cre.SV40 Cre Recombinase... Cre Recombinase James M. Wilson AV-5-PV2408 105550-AAV5 pAAV.GFAP.Cre.WPRE.hGH Cre Recombinase James ...AAV.TBG.PI.Cre.rBG Cre Recombinase James M. Wilson AV-8-PV2004 105545-AAV8 pAAV.CMV.HI.eGFP-Cre.WPRE.SV40 Cre Recombinase... 0.4.Cre.SV40 Cre Recombinase James M. Wilson AV-1-PV2676 105553-AAV1 pENN.AAV.hSyn.Cre.WPRE.hGH Cre Recombinase...pAAV.CMV.HI.eGFP-Cre.WPRE.SV40 Cre Recombinase James M. Wilson AV-5-PV2396 105558-AAV5 pENN.AAV.CamKII 0.4.Cre.SV40 Cre...James M. Wilson AV-1-PV1090 105537-AAV1 pENN.AAV.CMVs.Pl.Cre.rBG Cre Recombinase James M. Wilson AV-1-PV1848...PV1848 105540-AAV1 pENN.AAV.hSyn.HI.eGFP-Cre.WPRE.SV40 Cre Recombinase James M. Wilson AV-1-PV2004 105545...
  16. 27 Hot Plasmids from 2016

    Type
    Blog Post
    ...loxP-stop-loxP cassette into the Rosa26 locus, allowing for Cre-dependent expression of a GMAP inserted gene. The...produces point mutations at a rate of up to 1 per 500-1000 bp. In comparison, the DNA replication error rate...of a good screening experiment can be found on our blog post entitled “Genome-wide Screening Using CRISPR...Receptor-ome Expression and Screening via Transcriptional Output-TANGO (PRESTO-TANGO) to screen the NCC-1 library...and later create stable cell lines expressing it. The Church lab fixed this issue by creating a new dCas9...  CRISPR pooled libraries enable researchers to screen the entire genome for genes that regulate a wide...CRISPR knockout library and used this library to screen for genes involved in West Nile Virus (WNV) induced...
  17. Dos & Don'ts When Publishing a Scientific Manuscript

    Type
    Blog Post
    ...Maaike Pols, PhD, a Developmental Editor at F1000Research.  With many changes taking place in the world...world of science publishing, and an ever increasing number of journals and publishers to choose from, it... paper for publication in a scientific journal requires several considerations. First, it is important...them needing a subscription to the journal. An increasing number of funding bodies insist that the research...your Addgene plasmid #), and other reagents. F1000Research, among many other journals, has joined a pilot...results more valuable. Some journals, including F1000Research, also ask for the raw data behind the figures...several rounds of revision before acceptance. F1000Research uses a novel form of peer review that occurs...
  18. Colony Formation Titering Assay

    Type
    Protocol
    ...channel pipette 20–200 µL single channel pipette 200–1000 µL single channel pipette Ice bucket CO 2 incubator...likelihood of multiple integration events decreases as the dilution increases. Calculate the transduction units...cell lines and selection markers. Note this assay requires staining resistant colonies with crystal violet... remove cells and debris. Lentiviral titer can decrease during cycles of freeze-thaw. If you are freezing...
  19. Antibody Validation for Flow Cytometry

    Type
    Blog Post
    ...and flow cytometry. F1000Research, 13, 817. https://doi.org/10.12688/f1000research.154034.1 Laflamme, ...antigen of interest in the given protocol. This requires use of one of the five pillars of antibody validation...validation, and it is recommended to screen multiple candidate antibodies when possible. If cost is prohibitive...synaptotagmin 1 page. The data produced is available on the F1000 gateway and Zenodo community.  Knockdown approach...interest. By correlating your data sets, you can increase confidence that the labeling observed represents...experiment. We find it useful to start with a screening procedure in easily genetically modified cell ...
  20. Plasmids 101: NGS Quality Control for Pooled Libraries

    Type
    Blog Post
    ...primers to create 200-300 bp sequencing products using PCR. A diagram of the product we created for the ...you want to have 100x-1000x coverage of your library: in other words, 100-1000x more reads than number...plasmid. However, lots of library DNA is needed for screening experiments, so the scale of the DNA prep is larger...rank the plasmids by abundance, scaled to 1, to create a “cumulative wealth distribution” curve, or Lorenz...a powerful research tool, but their proper use requires careful amplification and maintenance of good ...wishes you luck in your future library use and screening, and if you have any tips, input, or stories of...
Showing: 1 - 20 of 33 results