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Showing: 461 - 480 of 1059 results
  1. Working with Nuclear Receptors

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    Blog Post
    ...controlled by deliberate and compulsory actions instigated by the central nervous system signaling to peripheral...sensors for a diverse set of fat-soluble hormones, vitamins, and dietary lipids. Included in this family are...progesterone, androgens, and estrogens), fat-soluble vitamins A and D, thyroid hormone, fatty acids, oxysterols...composed of a tightly-bound invariant group of proteins, whereas the more loosely bound co-coregulators...explain how more than 300 different coactivator proteins individually contribute to cell regulation in ...acetyltransferase to luciferase, the basic assay remains widely used today.  The sheer abundance of these...
  2. Progress Towards a PAM-Free CRISPR

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    Blog Post
    ...or non-existent PAM requirement, and how these proteins are advantageous in today’s genome editing landscape...the site in question (Kwart et al, 2017). To add insult to injury, the most utilized PAM sequence, that...requirements. Luckily, there are some available.   Cas proteins that don’t utilize NGG   There are plenty of Cas9...same PAM preference of NG was isolated by the Kleinstiver Lab (read more on this lab's other developments...developments below!) (Walton et. al, 2020). These Cas proteins have everything we know and love about Cas9, but...and location.   Nearly PAM-less editing   The Kleinstiver lab sought to address the PAM problem through...
  3. Degrading DNA with Cascade-Cas3

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    Blog Post
    ..., and Cas11. Type I-E Cascades contains all five of these Cas proteins, while type I-C Cascades do not...boundaries defined by anti-CRISPR proteins or running into other proteins naturally bound to the DNA. Cas3...The helicase domain is then activated, and Cas3 begins unraveling the double-stranded DNA (dsDNA) in what...Cas9 vs. The Other Cas(s) CRISPR 101: Anti-CRISPR Proteins Switch Off CRISPR-Cas Systems INTEGRATE: Bacterial...
  4. Common Injection Routes in Mice

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    Blog Post
    ... as “instillation” or “gavage,” as they do not require any punctures. Intratracheal instillation Intratracheal...Skill required: advanced Intranasal instillation Intranasal instillation is very similar to its intratracheal...compounds, as circulation is slower, and more institutional oversight is required. Restraint: mechanical...Intratracheal instillation is used to deliver substances directly to the lungs. It is an advanced technique...
  5. Tips for a 1st time AAV user (by a Rookie AAV user)

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    Blog Post
    ... myself writing AAV production tricks into the margins of my protocol. While these tips weren’t critical...replication uses the host’s polymerase, but requires Rep proteins to process a double-stranded intermediate into...cultures of your AAV transfer plasmid at 30 °C instead of 37 °C and then screen for ITR recombination ...transform AAV transfer plasmids into bacterial strains, like NEB Stable. NEB Stable competent cells lack... should consider performing PEG precipitation. Instead of sonicating the cell pellet, I lyse the cells... Stone and Harshana de Silva Feelixge at Fred Hutchinson Cancer Center for teaching me about AAV production...
  6. Mobile-CRISPRi: Bringing CRISPRi to Diverse Bacteria

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    ...resistance selection markers, gRNAs, and dCas9 proteins. Second, it can be introduced into a broader range...tnsB, tnsC, tnsD, and tnsE), and a plasmid that contains the Mobile CRISPRi cassette flanked by left and...recipient's genome. Antibiotic plates lacking DAP select against donor bacteria and for recipients with an integrated...CRISPRi to non-model bacteria including pathogenic strains and environmental isolates. For example, Peters...expressed RFP reporter, was variable across bacterial strains, ranging from an ~8 to 150-fold reduction, with...the relative frequency of each of the 40 library strains was measured after 6 and 12 generations with or...
  7. Adenoviral Delivery of CRISPR/Cas9 Aims to Expand Genome Editing to Primary Cells

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    Blog Post
    ...encapsulating the genome is majorly composed of three proteins that can be easily modified in order to facilitate...provide a large transgene packaging capacity. For instance, with a packaging capacity of about 6 kb, the ...mechanism to knock out genes as a result of an insertion, a deletion or a frameshift (Ding et al., 2014...attribute this phenomenon to the presence of terminal proteins capping the ends of linear double-stranded AdV...several biological systems. It has been used for instance in inherited disorders such as B-thalassemia, ...steatohepatitis cancer. In deficiencies of plasma proteins where Adv vector delivery is often used, the CRISPR...
  8. Antibodies 101: Flow Compensation

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    ... depending on your flow cytometer’s setup. For instance, BV510 and AmCyan have almost identical emission...and how do I fix it? When plotting two channels against each other, you should be able to draw perpendicular...single-color APC control, with APC and APC-CY7 plotted against each other. Since it is a single-color control,...After increasing the compensation values for APC against APC-Cy7, the populations are in more of a straight...compensation value of five was applied to APC-Cy7 against APC to correct for this bleed. A compensation value...population is not a double-positive population and is instead due to bleeding, you will see the populations move...
  9. Transgenic Organisms, Cas9 Gene Drives, and Appropriate Safeguards

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    ...Wyss Technology Development Fellow at the Wyss Institute and Harvard Medical School. Scientists making ...drive? The simplest way to make a gene drive is to insert an endonuclease gene within its own cut site1. ...spreads through the wild population and immunizes it against the first drive. Laboratories interested in building...question), why not use them whenever applicable?Against this, consider the cost of an accidental release...accidental release could delay real-world applications against scourges such as malaria and dengue for many years... Holm, D. G. & Suzuki, D. T. Genetic Control of Insect Populations: I. Cage Studies of Chromosome Replacement...
  10. CRISPR 101: Ribonucleoprotein (RNP) Delivery

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    ...such as PX459, which encodes Cas9 and contains a site for inserting a custom gRNA.  While this methodology...translation delays editing What are Cas9-gRNA ribonucleoproteins? One alternative approach, which avoids many...Schier laboratories. Delivering Cas9-gRNA ribonucleoproteins  An advantage of performing CRISPR experiments...vivo applications. This technique utilizes Cas9 proteins harboring receptor ligands (C in the figure above...., et al. "Cationic lipid-mediated delivery of proteins enables efficient protein-based genome editing...
  11. DNA Purification Without a Kit

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    Blog Post
    ...causes the proteins and genomic DNA to precipitate. Plasmid DNA is free in solution. Proteins and genomic...the same principles: cells are lysed, RNAs and proteins are removed to leave you with DNA. This DNA is...you lyse the bacteria and denature the DNA and proteins in solution. The pH is then lowered using a renaturing...phenol chloroform extraction to remove remaining proteins and RNase. Finally, DNA is precipitated with alcohol...identical to that of commercially available kits but instead of binding DNA to silica columns, it’s bound to...
  12. Tips and Tricks for Using Golden Gate Modular Cloning (MoClo)

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    ...terminator. Created with BioRender.com. The Sainsbury Laboratory Golden Gate Cloning videos made by ...according to their concentration, size, and the desired insert-to-vector ratio using the equation in Figure 3....plasmid volume for MoClo experiments. The term ‘insert’ refers to plasmids carrying each part, ‘vector... the ‘amount of vector’ and the ‘molar ratio of insert to vector’ can be defined by you.   Save time...each transformation and/or use different E. coli strains with higher transformation efficiency. If you’re...We strongly encourage you to sequence the entire insert region of your final plasmid or those you are selecting...
  13. Plasmids 101: Shuttle Vectors

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    ...origin of replication (ori), where DNA replication begins, so a bacterial plasmid needs a compatible ori ... divide. In transient transfection, the vector remains episomal, meaning it stays separate from the genome...synthesis, and the neomycin resistance gene protects against any of them. But different aminoglycosides work...options doesn’t end there. Make sure you read the instructions for whatever antibiotic you choose to ensure...to spontaneously develop resistance to selection toxins. Auxotrophic selection is useful for producing ...researcher may choose not impose selection on cells and instead to use a vector with a reporter, such as a fluorescent...
  14. Healthcare Consulting: A Door to the Business of Life Sciences

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    ...pharmaceutical companies, biotech start-ups, health insurance companies, and governments on the most effective...physicians and patients, shaping discussions with insurance companies about the pricing and coverage of drugs...situations might be especially challenging. For instance, the client might need to get a large amount of...occasions, clients can be excessively demanding. For instance, a client may offer a lot of pointed feedback ...understanding of the molecular behaviors of chemicals and proteins to learn how a particular drug or medical device...therapeutic approach brings to patients, doctors, and insurance providers, and is crucial to how our clients’ ...
  15. Save Time with Transient Plant Leaf Transformations

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    ...these experiments can be done in days to weeks instead of months to years. In the plant sciences “transient...evaluate its function. In nature Agrobacterium contains a plasmid with a T-DNA (transfer-DNA) region. ...pSB166 - pL2_pSB90_tMAS::rLUC-I::pMAS. Fluorescent proteins (FP, e.g. GFP) can be used in many ways. Often...from Agrobacterium. Test different Agrobacterium strains We used the disarmed Agrobacterium tumefaciens ...plants using syringe agroinfiltration." Recombinant proteins from plants. Humana Press, 2009. 41-50. PubMed... 5.02 (2003): 103-115. Hu, Ching-yeh, et al. "Intrinsic GUS-like activities in seed plants." Plant cell...
  16. Advanced Uses of Cre-lox and Flp-FRT - A Neuroscientist’s View

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    ...expression while proteins needed for later experiments (cellular tracking for instance) can be controlled...Tamoxifen is added. Tamoxifen then binds to the ER-LDB domains of the fusions allowing Cre/FLP translocate to ...fluorescent cytoplasmic markers (e.g. eYFP) and synaptic proteins (e.g. postsynaptic PSD95-mcherry) are used in ...In order to analyze the function of individual proteins in neuronal circuits or synaptic remodeling, researchers...is fascinated by the question of how genes and proteins coordinate billions of neurons to form the functional...
  17. CRISPR 101: Which Cas9 Do I Choose for My CRISPR Experiment?

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    ...with higher specificity (eSpCas9 and HypaCas9) instead.  Choosing a Cas9 for site-specific modifications... effects. The SpG variant, discovered by the Kleinstiver group has a PAM of NGN (Walton et al., 2020)....system can be used with a variety of impaired Cas9 proteins (such as SpRY) with altered PAM requirements, ...facilitates recruitment of multiple activation domains to the same genetic locus via co-expression of ...epitope tagged dCas9 and antibody-activator fusion proteins. The Synergistic Activation Mediator complex, ..., R. T., Christie, K. A., Whittaker, M. N. & Kleinstiver, B. P. Unconstrained genome targeting with near-PAMless...
  18. Transferable Skills Guide: Creativity

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    Blog Post
    ...yourself needing to brainstorm with a team. One major challenge with these brainstorming sessions is avoiding...with unlimited time? Another strategy for your brainstorm session is to start with something completely... students during an interview. When they were instructed to use the three-ring binder as a starting point...people to agree with the most prominent idea, and instead building an environment where everyone has their... ideas that I have found helpful in my team brainstorming sessions.  Allow the group time to think about...
  19. Evolution of Lab Techniques

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    ...whether you are perusing classic papers or are brainstorming new technological innovations. Let’s take a ...blotting to screen founder transgenic animals for the inserted transgene because Southern blots have a lower ...digests. A researcher can test the orientation of an insert in only a few hours at low cost with restriction...do not typically rely on Sanger sequencing but instead use methods like pyrosequencing that are parallelized...techniques we use now may soon become obsolete. For instance, the popular genome-engineering tool, CRISPR, ...mouse lines, such as BAC transgenic or traditional knockins/knockouts, a thing of the past. In the sequencing...
  20. Site Directed Mutagenesis by PCR

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    ...reporter constructs), in functional analysis of proteins (to perform alanine scanning mutagenesis or targeted...should be resistant to Cas9 cleavage. If a plasmid contains the template, site-directed mutagenesis can be...which is dam+). Methylation deficient bacterial strains can be identified by the dam13(-) mutation – you...you’ll want to steer clear of these strains when preparing the plasmid template for site directed mutagenesis...functional regions of the plasmid including the insert. This is essential since mutations are potentially...PubMed PMID: 2448875. 4. Xia, Yongzhen, et al. "New insights into the QuikChangeTM process guide the use of...
Showing: 461 - 480 of 1059 results