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  1. Early Career Researcher Toolbox: Free Online Molecular Biology Tools

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    Blog Post
    ...primer design Design primers for Goldengate cloning   Design primers for In-Fusion Cloning Design primers...traces, while the paid version provides more tools for plasmid mapping and design (Figure 1). Benchling: While...academic users. Serial Cloner: Free desktop-based software for plasmid design and mapping. ApE (A plasmid Editor...Primer design tools Many of the above-listed plasmid mapping tools have built-in primer design tools, ...stand-alone sites for general primer design, as well as primer design for different cloning applications...characteristics. NEB Data-optimized Assembly Design (DAD): This tool designs overhang sets for high complexity Golden...Primer design. Plasmid mapping. DNA sequence analysis. We all have our favorite tools for tackling these...
  2. CRISPR 101: Multiplex Expression of gRNAs

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    Blog Post
    ...ligated into Cas9 or dCas9-containing destination vectors. Destination vector options include humanized wt...cell that gets the plasmid contains all of the desired gRNAs. This increases the chance that all the edits...promoters. To use this plasmid, you simply order oligonucleotides for your chosen gRNA target sequences and ...ordered assembly of multiple components into a destination vector. The first step in CRISPR/Cas9 Golden ...Golden Gate multiplexing is to clone the oligonucleotides specifying each gRNA target sequence into distinct...together to allow for ordered assembly into a destination vector that expresses Cas9. This is illustrated...rectangles) are cloned into various plasmids using oligonucleotides. These plasmids contain Type IIS restriction...
  3. 28 Hot Plasmid Technologies from 2015

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    ...vectors in a Multisite Gateway reaction with a desired destination vector expressing a separate reporter gene... can't give all of them attention they righlty deserve, but, in this post, we'll provide a small sampling...-2xNLS-VP64 and dCas9(N)-FRB-NES). This system provides users greater temporal control over CRISPR/Cas9...cell events Three years ago, Brian Kuhlman’s lab designed photoswitchable dimers by fusing the SsrA peptide...the authors recently used computational protein design, phage display and high throughput binding assays...transcription of downstream genes. Nihongaki et al describe the targeted activation of endogenous genes and... a gene-specific forward primer containing the desired restriction site (the MCS has several options) ...
  4. Plasmids 101: Golden Gate Cloning

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    ...customized to direct assembly of DNA fragments. When designed correctly, the recognition sites do not appear... scheme is as follows: the gene of interest is designed with Type IIS sites (such as BsaI or BbsI), that...and do not appear in the final construct. The destination vector contains sites with complementary overhangs...ligation can be done in one 30-minute reaction. The destination vector and entry vector(s) are placed in a single...IIS enzyme and ligase. Although the original destination vector + insert may spontaneously religate, this... be re-digested. In contrast, formation of the desired ligation product is irreversible because this construct...a single reaction! These overhangs specify the desired order of fragments, and the loss of enzyme recognition...
  5. Uncovering Ancestral Bias in CRISPR Research

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    ... reference?  The CRISPR guides used in the screens they analyzed were designed to have a perfect match...African descent have approximately 20% more single nucleotide polymorphisms (SNPs) that map to guides in the...accounted for in the CRISPR guides they used, leading to mismatches between the guides and the lines’ genomes...modify the CRISpick algorithm to prevent guides from being designed that target regions with high genomic...coming through an unexpected source: the CRISPR guides, short pieces of RNA that bind to a cell’s DNA,...x-axis) which SNPs map to thetargeting sequences of guides across 8 CRISPR libraries. Samples are divided ...are more common in individuals of African descent.Correcting the bias  While their thorough analysis uncovered...
  6. 10 Steps to a Perfect Science Talk

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    Blog Post
    ...suspense. Notice the simplicity of their slides and how the slides complement the spoken message. Learn from...speak to start creating slides or thinking about content. Create a Google.slides or Powerpoint file right...how these speakers talk without looking at their slides or notes. Listen to their stories and narratives...listeners to be thinking “What happens next?”  Describe how you pushed to a solution or overcame obstacles...term, but are worried that this might sound condescending, consider explaining the term on a slide but...talk will really take and to adjust content and slides to better suit the target time frame.   I suggest...peers than a less supportive audience? 7. Hone Your slides Use big images that are easy to see (and for heavens...
  7. Plasmids 101: Walkthrough of Addgene’s Snapgene-Powered Quality Control Process

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    ...experiments that can be partially designed using the Snapgene desktop software. If a plasmid contains a...sequencing results with reference sequences To design experiments for further plasmid verification Identifying... contents of the resulting FASTA file into the desktop version of Snapgene to visualize the sequence and...in Snapgene’s extensive database. Snapgene also provides easy visualization of open reading frames, which...any known sequences for the insert. The Snapgene desktop software allows us to quickly align multiple sequences...verification experiments: Primer and restriction digest design Some regions of plasmids are difficult to sequence...region with a high amount of guanine and cytosine nucleotides, we might need to send it for Sanger sequencing...
  8. Scientific Reproducibility - Focusing on Solutions at the Minisymposium on Reproducibility

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    ...experimental designs and we need to be transparent about the reasons we alter these designs if we do so...experimental design to a journal prior to performing the experiment (or set of experiments), the design would...from the event can be found below along with a description of the program beneath it. You can jump to the...the different time stamps in the description to watch any sections you’re particularly interested in, ...JoVe, and Bio-protocol all work to provide more descriptive and interactive protocols that make it much easier...and not just impact. Cause #3: Poor experimental design It’s easy to get excited about positive results...experiments to work, but part of good experimental design is recognizing that we’re biased and taking steps...
  9. Custom CRISPR Screens & the Green Listed Software

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    ... massive amount of descriptive transcriptomics data. Custom CRISPR screens designed to target differentially...Institutet, in Sweden. It can be very time consuming to design 5 guide RNAs (gRNAs) targeting each of the 1000...). Green Listed is a new software tool used to design gRNAs for custom CRISPR screens targeting a (long...moment, 13 full genome SpCas9 knockout libraries designed by different academic labs, targeting mouse, human...drug targets  Another interesting approach is to design screens against known druggable targets, preferentially...library from Addgene, and then use Green Listed to design a smaller validation screen using selected gRNAs... could also be combined. For example, you could design a screen targeting all differentially expressed...
  10. Plasmids 101: Knockout/Knock-In Plasmids

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    ...often use the Cre/Lox system described earlier. In this case, you design your targeting vector such that...replacing it or disrupting it with an piece of DNA designed in the lab. Specially constructed plasmids can...template with the endogenous gene. Here, we'll describe the techniques and the plasmids used to inactivate...inactivate specific genes in mammalian cells. Despite the popularity of CRISPR-based knockout/knock-in systems...locus with homologous sequence using a specially designed vector that contains sequence homology to the ... the process, we’ll walk through an experiment designed to knock out exon 2 of a given gene.   ... Figure 1: A knockout targeting vector designed to insert a resistance gene. The vector contains a neomycin...
  11. Plasmids 101: Multicistronic Vectors

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    ...adapted "self-cleaving" 2A peptides into their muliticistronic vectors. These peptides, first discovered in ...plasmids) are designed to have one or more of the genes replaced.  Additionally, 2A peptides could be PCR-cloned...PDF that you can save on your desktop. The Plasmids 101 eBook is designed to educate all levels of scientists...incorporated into plasmids for research purposes are described below. IRES Elements Translation in eukaryotes...the specific genes cloned into the vector.3  2A Peptides To overcome some of the disadvantages of the IRES...self-cleaving" is not entirely accurate, as these peptides are thought to function by making the ribosome...Proline.  The table below lists the four common 2A peptides employed by scientists. 2A cleavage is universal...
  12. Plasmids 101: Gibson Assembly and Other Long-Homology Based Cloning Methods

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    ... friends on the Cambridge 2010 iGEM team that describes the basics of Gibson assembly as a parody of “...assembly The Gibson assembly technique was first described by Dr. Daniel Gibson and colleagues at the J. ... Both Snapgene and NEB have tools that help you design primers for PCR amplification of fragments to incorporate...demonstration of how to use Snapgene’s program to design primers for Gibson Assembly. For a simple example...without scars as depicted below. First, you need to design primers to amplify the two fragments while also...the process works best with fragments over 200 nucleotides. This may be because the exonuclease could chew... through an entire fragment shorter than 200 nucleotides before the annealing and polymerization steps...
  13. Hassle-free 96-well Format Epitope Tagging Using Cas9 Ribonucleoprotein

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    ...knock-in. Another good design tool can be found at Desktop Genetics .For ssODN design, remember to incorporate... systems, you will have to design your crRNAs using other web-based design tools (for C-terminus tagging... not work in pull-down assays: Epitope tagging provides a solution Proteins - the workhorses of the cell...to mention frustrating. One elegant solution to sidestep the antibody problem is to tag the protein of ...sequences at the intended target site. With the widespread adoption of CRISPR/Cas9 technology and rapid ...bioinformatics tool for guide RNA and donor DNA design, and implemented our optimised protocols into a...genome browser: https://www.ensembl.org/index.html Design crRNA/ssODN: Using Ensembl Transcript ID(s) as ...
  14. High Complexity Golden Gate Assembly with NEB’s DAD

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    ...rules of thumb for designing your overhang sets. But are those rules the best way to design GGA overhang sets...overhangs with the same three nucleotides in a row; (4) no more than two nucleotides in the same position; (...data-optimized assembly design (DAD) to build out three tools to help researchers design high-fidelity Golden...the traditional rules of thumb for overhang set design allowed for high-fidelity assembly for sets of ... overhangs that violate some of the traditional design rules) for successful high-complexity Golden Gate...with a high potential for mismatches, so you can redesign individual pieces as needed to improve fidelity... a stochastic search algorithm rather than pre-designed sets, so identical searches can return multiple...
  15. Simplify Cloning with in vivo Assembly

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    ...ultracompetent (109 CFU/μg) cells. Primer design Using specific primer design (Figure 2), IVA cloning can be used...primers that bind at either side of the undesired portion, designed to amplify the rest of the vector sequence...primary method to produce the linear fragments, as desired modifications and homologous regions can be encoded...specifically cuts methylated DNA, so it will selectively destroy the template, but not newly synthesized sequences...mutagenesis to complex assembly of multiple genes. Primer design for each type of modification is shown in Figure... main requirement for IVA cloning is carefully designed primers. The majority of mistakes are due to incorrect...homologous sequences are encoded at the 5’ end. First design the template binding region, with a melting temperature...
  16. Plasmids 101: Colony PCR

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    ...step to colony PCR is designing primers. There are 3 strategies for primer design: 1) insert-specific primers... second option is to design backbone-specific primers. These primers are designed to anneal to sites that...less money. The key steps to colony PCR are: 1) design primers to detect the presence of your insert; ...things to consider when performing colony PCR.   Designing colony PCR primers The first and perhaps most ...-specific primers: Insert-specific primers are designed to anneal to an insert-specific sequence. This...backbone but that contain different inserts. When you design primers to anneal outside the cloning site, it ...about insert orientation, then you might consider designing orientation-specific primers. Blunt end cloning...
  17. CRISPR Challenges: Standardization and Homology Directed Repair

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    ...working with CRISPR than just designing a repair template that contains your desired edit, and I want to make...say about CRISPOR, a tool to help you design, pick, and close guides for Cas9 and Cpf1. This tool supports...The blog post I mentioned, John Doench’s How to Design your gRNA for CRISPR Genome Editing, gets over ...these numbers show that this basic concept of gRNA design is still challenging for researchers using CRISPR..., and that standardizing and improving the gRNA design process and rules for various applications is necessary...tackle the challenges of DNA repair (with bonus gRNA design resources.) Subscribe to CRISPR updates on our ...in Human Cells Hands-on tips for repair template design from guest bloggers Dominik Paquet and Dylan Kwart...
  18. Comparing Cas9 to NgAgo: Can the Argonautes Best CRISPR?

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    ...DNA guides NgAgo uses 5’ phosphorylated DNA guides (so called “gDNAs”) rather than the RNA guides employed...24 base DNA guides may be more user-friendly, since they can be ordered as oligonucleotides and should ...gDNA guides will also need to be transfected into the cells of interest. In contrast, RNA guides must ...important role in RNA interference, binding RNA guides to cleave foreign RNA. Argonaute proteins are also...cleave DNA in vitro, directed by phosphorylated DNA guides. Unfortunately, Swarts et al. were unable to show...NgAgo preferred certain guide sequences - using 5 guides/gene for 10 genes, they did not observe differences...a different approach, randomly removing 1-20 nucleotides from the cleavage site specified by the gDNA....
  19. Rewiring Metabolic Circuitry with CRISPR RNA Scaffolds [Video]

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    ...for CRISPRi are described here: http://www.addgene.org/crispr/qi/ Plasmids described in  Zalatan et ...stepwise protocol on designing and using RNA scaffolds: Delebecque, C. J. et al. Designing and using RNA scaffolds...regulators allows a greater degree of control of desired expression levels dependent upon the type of transcriptional...transcriptional regulator or the number of designed scaffold binding sites. With hundreds of characterized...tunability of transcription is possible. From a design perspective, this is appealing since the RNA scaffold...pairing, allowing for rational, straightforward design. Since the technique relies on base pairing, it...and multidirectional multiplex control via scRNA design is readily apparent in metabolic engineering. The...
  20. Twenty Years of Sharing: Expanding Accessibility

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    ...shipping. However, there were issues that persisted despite our best efforts. With a little over half of our...packages navigated customs and arrived at their destination in a timely manner and at the correct temperature...for their experiment.     Table 1: Most popular guides, protocols, and collections of 2023. Educational...Educational Resource Top Five by Views Guides CRISPR Guide Lentiviral Guide AAV Guide Optogenetics...Electrophoresis Bacterial Transformation How to Design a Primer Creating Bacterial Glycerol Stocks Inoculating...Origin of Replication What is a Plasmid? How to Design Your gRNA for CRISPR Editing The Promoter Region...Analysis Videos What is a Plasmid? How to Design Primers for PCR Agarose Gel Electrophoresis Inoculating...
Showing: 221 - 240 of 981 results