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  1. Science Career Options

    Type
    Blog Post
    Published
    Feb. 23, 2017, 1:30 p.m.
    ...travel be required or will you stay in one location? How long is the commute? Will the job require public...Science careers divided by the most pertinent skills required Research skills The ability to think critically...and setbacks. There are many roles that actively require these skills, including: Science Reporter Scientific...accuracy and attention to detail are valuable skills acquired from a science degree that can be applied to many... Experience in the field or in a position that requires travel can show that you are self organised, reliable... Zoological Worker Conservationist Documentary Director Parasitology Botanist Nature Photographer/Artist...employers. Increasingly, computer skills are highly desired, as roles are becoming more reliant on technology...
  2. March for Science

    Type
    Blog Post
    Published
    April 21, 2017, 2:30 p.m.
    ...government cannot declare that gravity change direction and make things fly up when we drop them. Scientific... their side of the bargain and do the research required to inform the public (8–13). Facing the possibility...consequences While frustration and anxiety have inspired people to rally for science, others are concerned... to take place around the world. There is no requirement that marchers or supporters be scientists – on...science is done by people like them. This, when paired with long-term science outreach, may have the most...treatments promised by modern research, more funding is required. This is by no means an exhaustive list and every...science rallies scientists to political action, and inspires politicians and citizens to include science in...
  3. Fluorescent Proteins 101: When GFP lets you down

    Type
    Blog Post
    Published
    Aug. 23, 2018, 12:05 p.m.
    ...into proteins are steps in that direction (Chatterjee et al., 2013; Hilaire et al., 2017). GFP can only be...myristoylation requires an N-terminal consensus sequence (MG-) and prenylation requires a C-terminal consensus... 2002). GFP needs oxygen Chromophore formation requires a fully folded beta-barrel structure, followed...chromophore (Tsien, 1998). Importantly, this reaction requires molecular oxygen and as a consequence GFP remains...proteins.Therefore, GFP is not suitable for applications that require anaerobic conditions. In experiments requiring ...are generally added to the bathing solution and require uptake by the cells. Which of these strategies ... et al. (2016). To date, small probes that are entirely genetically encoded do not exist, but the development...
  4. Fluorescent CRISPR Reporters: SRIRACCHA and GEmCherry2

    Type
    Blog Post
    Published
    May 26, 2020, 1:15 p.m.
    ...targeted Cas9 cleavage, and repair through homology directed repair (HDR) and non-homologous end joining (NHEJ...created SRIRACCHA in 2017 to enrich and identify desired CRISPR mutants (Wen et al., 2018). SRIRACCHA uses...constructs for the reporter to work and to make the desired genome edit:  A donor plasmid that contains a ...OH-T and doxycycline. A gRNA that targets your desired gene (whose sequence is also found in the reporter...the reporter gene that was cleaved by Cas9 and repaired via HDR using the supplied donor plasmid will ...presumably the endogenous target site will be cut and repaired by NHEJ as well. The ratio of RFP to GFP expressing...integrated GFP reporter leaving you with just your desired genomic edit.  Find SRIRACCHA plasmids at Addgene...
  5. How to Design Your gRNA for CRISPR Genome Editing

    Type
    Blog Post
    Published
    Sept. 24, 2020, 1:15 p.m.
    ... homology directed repair (HDR) to incorporate new information into DNA. This also requires an exogenous...lightly! Indeed, truly achieving the gold standard requires not one but two rounds of single cell cloning ... of target site is far more constrained by the desired location of edit; efficiency decreases dramatically...limited to single nucleotide transitions but still requires a nearby PAM, although these are still early days...to optimize numerous parameters to generate the desired edit. The wrench: Gene activation and inhibition...technologies – a nuclease-dead Cas9 (dCas9) is directed near the promoter of a target gene. Here, the ...the FANTOM database, which relies on CAGE-seq to directly capture the mRNA cap, provides the most accurate...
  6. Building Global Connections with the International Mentorship Program USA-EUROPE

    Type
    Blog Post
    Published
    Nov. 6, 2015, 3:30 p.m.
    ...correspondence via e-mail throughout the entire year. In addition to their direct training role as mentors to Spanish...Co-founder/director of the non-profit foundation IMFAHE and its International Mentoring Program Director of Strategic... as an idea was conceived and developed by its Director, Dr. Zafira Castano Corsino, a junior faculty ...’s Hospital (BWH). Based on her experience co-directing Mentor Circle Programs at BWH and providing career...supported, and can more fully identify with and be inspired by the mentor’s successful example. For evidence...mentors also facilitated the development of bidirectional USA-Europe professional collaborations, setting...their pre-program self-assesment. Achievements directly attributable to participation in the program included...
  7. Progress Towards a PAM-Free CRISPR

    Type
    Blog Post
    Published
    March 7, 2024, 2:39 p.m.
    ...enzymes, which have a flexible or non-existent PAM requirement, and how these proteins are advantageous in today...sequence is suitable, but there is no PAM next to the desired cut site, then a further-away gRNA where there ... may wonder: how close is close enough for the desired edit to still occur if the cut site is sub-optimal...it depends, but generally the efficiency of the desired edit is reduced by over 50% when the cut site is...there is a need to eliminate or reduce the PAM requirement to allow flexibility in gRNA selection and subsequent...constraints, or at least has looser or different requirements. Luckily, there are some available.   Cas proteins... generating Cas enzymes with alternative PAM requirements (Zhao et. al, 2023). xCas9 has been shown to...
  8. Polymerase Chain Reaction Overview and Applications

    Type
    Blog Post
    Published
    Aug. 10, 2021, 1:15 p.m.
    ... Park.  In addition to Taq DNA polymerase, PCR requires free nucleotides (dNTPs), template DNA to amplify...are crucial for this process as DNA polymerases require an existing strand of DNA to add nucleotides to...exponentially replicate the target DNA of interest. This entire reaction used to be done manually in water baths..., or for generating mutated sequences for site-directed mutagenesis.  Quantitative polymerase chain reaction...measuring a starting DNA concentration using PCR. qPCR requires the addition of a probe based fluorescent dye ...transcription-qPCR (RT-qPCR). The first step of this process requires RNA to be converted to cDNA using reverse transcription...rare alleles or mutations. ddPCR also does not require a reference or standard curve, which can be time...
  9. An “elegans” Approach to Better CRISPR/Cas9 Editing Efficiency

    Type
    Blog Post
    Published
    Dec. 17, 2020, 1:30 p.m.
    ...currently requires additional experimental manipulation. In some cases, injection of Cre is required, however...selection marker (Kim et al., 2014). Meanwhile Andy Fire’s lab used oligo-mediated knock-in of a dominant ...development of this approach reported in 2017 uses the direct injection of a CRISPR/Cas9 ribonucleoprotein complex...advantage of being used in any genetic background, but require variable amounts of experimental manipulation and...– to work with inefficient sgRNAs in my initial direct screening efforts, which were similar to the approach...products used to identify a single 2xFLAG knock-in by direct screening. The center images depict the power of... DNA double-strand breaks up to 54 bp from the desired insertion site result in efficient editing. Repair...
  10. 22 Hot Plasmid Technologies from 2014

    Type
    Blog Post
    Published
    Jan. 6, 2015, 5:21 p.m.
    ...-use of existing elements. DNA sequences for a desired component are cloned into Golden Gate entry vectors...expression to degradation. Chemical approaches may require expensive peptides or small molecules and exceed...on or off the expression of shRNA. This system requires less work than using established methods and minimizes...thorough understanding of complex biological systems requires both a catalog of molecular players and contextualized...fragments contain 482bp of overlapping sequence that direct Homologous Recombination (HR) or Single Strand ...strain EcAR7) and minimizing the set of plasmids required to make singly or multiply phosphorylated proteins...orientation, so that multiple DNA components can directionally assemble in a single reaction, while retaining...
  11. Meet the New Addgene Board Members!

    Type
    Blog Post
    Published
    April 28, 2020, 1:14 p.m.
    ... in Gene Therapy, Director of the Grousbeck Gene Therapy Center, Associate Director of the Ocular Genomics...Addgene welcomes three new members to the Board of Directors: Khandan Baradaran, Frank Stegmeier, and Luk Vandenberghe...of Quality at Dimension Therapeutics, which was acquired by Ultragenyx Pharmaceutical in 2017. As one of...In 11th grade she heard a talk about Z DNA that inspired her to major in molecular biology in college. ...funded,” she says. Baradaran met Addgene Executive Director Joanne Kamens several years ago through the Healthcare... an HIV lab and based on that experience, soon directed himself to finding “immunological and virological...commercialization efforts in gene therapy either through direct industry collaborations, grants, or setting up ...
  12. Starter Guide to induced Pluripotent Stem Cells (iPSCs) Part 2:  Reprogramming and Transdifferentiation

    Type
    Blog Post
    Published
    Nov. 6, 2018, 1:12 p.m.
    ...choice. This step is sometimes also referred to as “directed differentiation.” Specific cell media, supplements...transdifferentiation adult somatic cells are converted directly into a different cell type, bypassing the lengthy... carrying the transdifferentiation factors are directly injected into the organ of interest for in vivo...Highly efficient reprogramming to pluripotency and directed differentiation of human cells with synthetic ....N. Davis-Dusenbery, and K.C. Eggan, SnapShot: directed differentiation of pluripotent stem cells. Cell...PubMed PMID: 19255591. 17. Spence, J.R., et al., Directed differentiation of human pluripotent stem cells...PMCID: PMC3192723. 21. Grigoriadis, A.E., et al., Directed differentiation of hematopoietic precursors and...
  13. Multicolor Animals: Using Fluorescent Proteins to Understand Single Cell Behavior

    Type
    Blog Post
    Published
    March 5, 2019, 1:08 p.m.
    ...is located directly upstream of the fluorescent protein genes, Cre recombination is required before fluorescence... (XFP) of different colors to label an organ or entire organism. Because each cell can have multiple copies...transgene that will recombine independently, cells may acquire one of a variety of colors when a combination of...expressed. Each cell remains the same color for its entire lifetime and daughter cells retain the same color...tandem with a single promoter, but only the gene directly following the promoter is expressed. Cre-mediated...downstream in the construct. As RFP and OFP are directly downstream of the promoter in Brainbow 1.0 and...expressed in a single cell maintains its color over the entire length of the cell, even axons of up to 100 microns...
  14. Finding and Joining Your Dream Lab

    Type
    Blog Post
    Published
    April 8, 2014, 2:50 p.m.
    ... professors how they hire scientists for their labs. Tom Ellis selects new hires from a pool of CVs collected...three lab heads how they go about selecting new hires. This is followed by some perhaps surprising, yet...for both parties, he will invite the prospective hire to the lab to see how they fit in with the team....are dedicated and interested in science. “Postdoc hires are simpler because of their documented history ...with their interests.” George Church selects new hires initially based on those who notice and embrace ...technology development, etc). Second, the potential hire visits the lab for a full day, gives a 1 hour talk... typically offer more flexibility in choosing direction of a project. If you expect more 1:1 time with...
  15. CRISPR 101: Non-Homologous End Joining

    Type
    Blog Post
    Published
    April 16, 2015, 3:45 p.m.
    ...CRISPR/Cas9-introduced breaks are repaired. The following factors are required for NHEJ repair regardless of...pair of DNA ends together, forming a paired end complex The paired end complex then ligates compatible ...Non-Homologous End Joining (NHEJ) and Homology Directed Repair (HDR) – and how these pathways work, as...a higher capacity for repair, as there is no requirement for a repair template (sister chromatid or homologue...ends together. Similarly, it may be possible to direct insertion of an exogenous DNA fragment at a Cas9... structure of broken ends impacts how they are repaired. He works in Dale’s lab.        Dale Ramsden ...Blog Posts from Addgene: CRISPR 101: Homology Directed Repair CRISPR Protocol for Genomic Deletions...
  16. Recombinase-based State Machines Enable Order-dependent Logic in vivo

    Type
    Blog Post
    Published
    July 28, 2016, 2:30 p.m.
    ...applications that require minimal cellular perturbation. Also, this method requires live, intact cells...attB-attP pair is aligned (sites facing the same direction) on a register, then the result of their recombination...attB-attP pair is anti-aligned (sites facing opposite directions) on a register, then the result of their recombination...sequencing is simple and the most accurate method as it directly reads the state of a register. However, each Sanger...difficult to isolate single registers or if it requires reading so many registers that Sanger sequencing...backbone) contains the register. Depending on the desired application, the inducible promoters we used to... be replaced by sensors that correspond to the desired inputs. Such sensors do not necessarily have to...
  17. RANbodies: Reporter Nanobody Fusions

    Type
    Blog Post
    Published
    April 10, 2018, 12:56 p.m.
    ... allow for further purification, if desired, but it's not required for their use. Each RANbody is detectable...are a non-renewable reagent - Their production requires animal sacrifice and because they are an animal... for a summary. HRP HRP tagged RANbodies don’t require a secondary antibody for detection. Instead they...multi-labeling immunohistochemical protocols where either a directly labeled primary or a primary/labeled secondary...While Spaghetti Monster RANbody detection with a directly labeled anti-HA or -MYC antibody is less sensitive...synaptic partners (GRASP) assays No antibody required for detection RANbody is detected enzymatically...secondary Less sensitive than HRP-RANbody staining Requires secondary antibody staining HA Tagged GFP, RFP...
  18. Deep Dive: Statistical Tests (Comparisons)

    Type
    Blog Post
    Published
    March 7, 2023, 2:15 p.m.
    ... for exclusively less-than comparisons. Paired and unpaired t-tests Samples that come from the same subject...You’ve acquired your long-awaited data – and it looks great! There are some exciting trends in your experimental...certain information about. The assumptions and requirements that need to be met for a parametric test are... - Quantitative If your data doesn’t fit the requirements above, a non-parametric test may be the way ...only care if one group is different in a certain direction (i.e., you just want to measure if a sample is...treatment, for example - should be analyzed with a paired t-test, because they eliminate subject-to-subject... on the other hand, should be analyzed with an unpaired t-test, which does account for subject-to-subject...
  19. Sequencing Options for CRISPR Genotyping

    Type
    Blog Post
    Published
    Oct. 4, 2016, 2:30 p.m.
    ...component required (e.g. dsODN), doesn't require high read counts (fast multiplexing) Requires large cell...genome for all DSBs, doesn't require high read counts, fast multiplexing Requires delivery of dsODN (potentially...length of the gRNA given the stricter sequence requirement at the terminal 3’ PAM site (Fu et al. 2013; ...by sequencing (GUIDE-seq) (Tsai et al. 2015) and direct in situ breaks labeling, enrichment on streptavidin...BLESS detect double-stranded breaks and do not require high sequencing read counts making them fast and...contains both the rare off target event and the desired edit is low. Therefore, unbiased sequencing may...selected. Conversely, translational research may require the rigor of both forms of off-target analysis ...
  20. CRISPR 101: RNA Editing with Cas13

    Type
    Blog Post
    Published
    July 31, 2020, 12:30 p.m.
    ...editing systems; first, RNA editing doesn't require homology-directed repair (HDR) machinery, and could thus...in non-dividing cells. Cas13 enzymes also don’t require a PAM sequence at the target locus, making them... sequence, but orthologs like LwaCas13a do not require a specific PFS. Cas13 enzymes do not contain the...domains responsible for DNA cleavage, so they cannot directly edit the genome. A Cas13-based RNA editing system...enzyme for further studies. PspCas13b does not require a PFS, and it is sensitive to mismatches in target...the lowest amount of off-target editing. In one direct transcriptome-wide comparison, REPAIRv2 reduced...activity. They then performed sixteen rounds of directed evolution across the full ADAR2DD to further optimize...
Showing: 81 - 100 of 756 results