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We narrowed to 935 results for: ina

Showing: 221 - 240 of 935 results

  1. Viral Vectors 101: Parts of the AAV Transfer Plasmid

    Type
    Blog Post
    ...of an AAV plasmid. Inverted terminal repeat (ITR) sequence Inverted terminal repeats (ITRs) are what makes...in them.  Lox sites Lox sites, in combination with the Cre recombinase, are used to spatially and temporally...loss, it’s best to propagate AAV constructs in recombination-deficient bacterial strains, such as Stbl3s....FLEX or DIO. Lox sites are recognized by the recombinase Cre. Cre first flips the sequence between the...excise the sequence between the second pair. The final result is a permanently flipped transgene. By restricting...the end of the AAV genome, just upstream of the final ITR.  polyA  The polyadenylation or polyA signal...the end of the AAV genome, just upstream of the final ITR and downstream of the WPRE. TL;DR? Watch our...

  2. CRISPR 101: Any Base Transversion Editors

    Type
    Blog Post
    ...base editor (ACBE), they inserted the deaminase into the C-terminal domain of Cas9, which narrowed the editing...bystander edits. Their final tool, ACBE-Q (for an N108Q mutation in the deaminase), produced an average... (AAG). When adenine base editors (ABEs) were originally being developed for A → G edits, researchers ... MPG to an ABE would allow it to act on newly-deaminated inosines. Pro tip! The nucleoside inosine consists...further development. Figure 2: Mechanisms of deaminase-based adenine transversion editors. Red arrows...processes. Created with BioRender.com. The first deaminase-free base editor allows guanine transversions ...! All base editors up to this point relied on deaminase enzymes, either to directly accomplish the base...

  3. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

    Type
    Blog Post
    ...wtGFP is illuminated with UV-violet light (~400 nm), the chromophore photoconverts predominantly to the ...activates and inactivates Dronpa is not ideal, since this means Dronpa is quickly inactivated and less photons...PA-GFP to display almost no fluorescence when illuminated with 488nm light. However, when UV-violet light... to a 100-fold increase in fluorescence when illuminated with blue light (1). Similar to PA-GFP, scientists...derived from DsRed and mRFP, respectively. When illuminated with violet light, both variants are photoconverted...but then further exposure to blue light also inactivates the chromophore, leading to a non-fluorescent...find a version of Dronpa that doesn't become inactivated as quickly. Padron is a monomeric, reversible...

  4. Cancer and the Immune System: Deciphering the Relationship

    Type
    Blog Post
    ... “Three Es of Immunoediting” nomenclature. 1. Eliminate - Latent tumors are recognized by effector cells...interleukin (IL)-12 and interferon gamma (IFNγ) - and eliminate cancer cells. 2. Equilibrium - In a process analogous...in bacteria, the tumor cells that escape the elimination stage acquire genetic alterations and alter cell-surface...In contrast to the acute immune responses that eliminate early stage cancer cells, chronic inflammatory...tolerance-producing antigens enunciated above. Finally, signals released from the microenvironment help...cells, and often cannot eradicate metastasis or eliminate the probability of a relapse. Chemical and radiation...to aide chemotherapy and result in successful elimination of certain tumors. However, antibody stability...

  5. Four Ways to Package Transgenes That Exceed the Size Limit of Adeno-associated Virus

    Type
    Blog Post
    ...mRNA Surveillance Mechanism That Eliminates Transcripts Lacking Termination Codons. Science 295:2258–2261...generally accepted that some form of homologous recombination (HR) occurs via this region of overlap, but ...single over-sized vector, but not always.  The combination of serotype and tissue/cell type could have a...fragments are likely non-functional, they could be dominant-negative and/or toxic. A potential solution is...repairs Overview: The sequential homologous recombination approach delivers large donor templates using...Evaluating Efficiencies of Dual AAV Approaches for Retinal Targeting. Front Neurosci 11: . https://doi.org...Efficient mouse airway transduction following recombination between AAV vectors carrying parts of a larger...

  6. Adenoviral Vector Production and Troubleshooting

    Type
    Blog Post
    ...detailed instructions on how to generate the final recombinant adenoviral plasmid construct, please see Addgene...bacterial strain not prone to recombination for amplification. The final purified plasmid stock should...candidates for applications in oncolysis and vaccination!) In the 65 years since its discovery, researchers...linear double-stranded DNA of ~36kb, with inverted terminal repeats (ITR) present at both ends.   ...to immune response against AdV. Importantly, recombination-competent adenovirus (RCA) can be generated ...packaging cell line is transferred into the AdV by recombination. It is therefore recommended to test for the...more complex and the presence of helper virus contaminants have slowed the use of this system. New and ...

  7. Hot Plasmids and Viral Preps - January 2021

    Type
    Blog Post
    ...bringing the C-terminal and N-terminal Cre fragments together and permitting recombinase activity. Opto-Cre-Vvd... of bacterial gene expression By Meghan Rego Recombinases are enzymes that recognize, cut, and alter specific...translocation or cassette exchange. By utilizing recombinases to manipulate genomes, scientists can control...expression of their genes of interest. While recombinases are powerful gene expression tools in and of...Cells expressing an RFP reporter plasmid for recombinase activity were exposed to blue light. Cre-Vvd ...substantially improved activity as compared to other recombinase/photodimer pairs. Created with BioRender.com ...24390935/ Hypercompact genome editor CRISPR-Casɸ By Melina Fan The Doudna Lab adds to the CRISPR-Cas toolbox...

  8. Multiplexed Capture of Promoter-enhancer 3D Chromatin Structures Using CRISPR

    Type
    Blog Post
    ...situ of Regulatory Elements: The original CAPTURE method The original CAPTURE method requires the creation...Originally published Dec 7, 2017 and updated Jul 2, 2020. Promoters may be the star of gene regulation...Purification in situ of Regulatory Elements) method. The original CAPTURE method was published in 2017 and addressed...by PCR or deep sequencing. A drawback of the original CAPTURE method is that a new cell line has to ... of the CAPTURE 2.0 system To improve upon the original CAPTURE method, the Xu Lab made the following ...changes to create CAPTURE 2.0:  Replace the biotinalatable tag on dCas9 with a BioTAP-tag. The BioTAP-...delivery of the two remaining CAPTURE 2.0 components eliminates the need to create stable cell lines and allows...

  9. Of Myc and Men

    Type
    Blog Post
    ...peptide, while three bound to the C-terminal peptide. One of these C-terminal antibodies was Myc1-9E10 (aka ...Munro S, Pelham HRB (1987) A C-terminal signal prevents secretion of luminal ER proteins. Cell 48:899–907...Tagging Plasmid-based Recombinant Antibody Resources on Addgene.org  Find recombinant anti-c-Myc [9E10] ..., 1984). The strategy they landed on was to recombinantly append their proteins of interest with unrelated...protein had a highly specific antibody to the C-terminal five amino acids, meaning the tag could be quite...). They noticed that Myc1-9E10 and the other C-terminal antibodies only recognized the human c-Myc protein...sequences in these species, they found that the N-terminal half of the antigen differs significantly between...

  10. FLEx Technology and Optogenetics: Flipping the switch on gene expression with high spatial and temporal resolution

    Type
    Blog Post
    ...through site-specific recombinases such as Cre or Flp that induce DNA recombination at defined recognition... with an inactive opsin gene; in Cre expressing cells, however, Cre induces the recombination of the double-floxed... P1 site-specific recombination. Purification and properties of the Cre recombinase protein." Journal ...Taylor et al., 2016; Hooper and Maguire, 2016). Recombinant adeno-associated viruses (rAAVs) have become ...opposite orientations. Since Cre does not cause recombination between mismatched recognition sites, its presence...viruses, such as the optogenetic FLEx vectors in combination with transgenic animals or rAAVs expressing Cre... "Adeno-associated virus 2/9 delivery of Cre recombinase in mouse primary afferents." Scientific reports...

  11. 15 Hot Plasmids from 2017

    Type
    Blog Post
    ...thereby rendering them inactive in the cytoplasm. The authors use PhoCl in combination with this caging technique...Tol2 Gateway-Compatible Toolbox is based on the original Tol2kit generated by the Chi-Bin Chien lab (Kwan...with nonoverlapping emission spectra (N- and C-terminal tags for mTagBFP, TagRFPt, EGFP, mVenus, mCerulean3...Gateway-Compatible Toolbox Podcast Segment The impact of KLF4 N-terminal variants on iPSC generation Deriving iPSCs (induced...discrepancies, which they traced to a 9 amino acid N-terminal variation in the Klf4 isoform (KLF4s or KLF4L)...variant they call mScarlet. Bindels et al used a combination of deliberate and random mutagenesis to isolate...light-dependent Gal4 transcriptional activation and Cre recombination. Find PhoCl plasmids at Addgene. Zhang W, et...

  12. To Each HIS Own

    Type
    Blog Post
    ...today's biological research requires a close examination of specific proteins within a system. This can...expressed in frame on the N- or C-terminus of a recombinant protein of interest. The tag was developed as...wash steps removes excess proteins and other contaminants. The protein of interest is then eluted using...tagged protein of interest (purple) and several contaminating proteins (blue, green, orange) flows through...immobilized along with a polyhistidine containing contaminating protein (orange). A low imidazole wash buffer...buffer disrupts the weak interaction of the contaminating protein but not that of the protein of interest...wash buffer should be high enough to disrupt contaminant-metal ion binding without eluting the target ...

  13. Viral Vectors 101: Virus Safety

    Type
    Blog Post
    ...cabinet, it needs to be decontaminated in a biosafety cabinet. When decontaminating liquid waste, remember...production), there is a significant risk for aerosol contamination. As most centrifugation has to be done outside...heat sealed tubes can be used for extra security. Finally, when spinning down lentivirus, you’ll need to ...you should open in the biosafety cabinet and decontaminate after use. Virus-exposed plastics and other ...other surfaces should be thoroughly decontaminated after use, typically with bleach (plastic) or ethanol (...cities may require a higher percentage of the decontaminate to be used for BSL-2 waste, and of course, if... percentage indicates the proportion of the decontaminate in the waste itself, not in the solution that...

  14. An “elegans” Approach to Better CRISPR/Cas9 Editing Efficiency

    Type
    Blog Post
    ...efficiency. Finally, as shown in Drosophila S2 cells (Böttcher et al., 2014), inactivation of non-homologous...Originally published Jan 27, 2015 and last updated Dec 17, 2020. This post was contributed by Jordan ...heat-shocking to induce the expression of a Cre recombinase contained within the knock-in. Including Cre-...approach – co-CRISPR from Craig Mello’s lab – used inactivation of the unc-22 gene as their selection marker...Andy Fire’s lab used oligo-mediated knock-in of a dominant mutation, known as co-conversion (Arribere et ...by channeling DNA breaks into the homologous recombination repair pathway. Reagents required to perform...), and Victor Ambros and Gary Ruvkun for their seminal work on micro RNAs in C. elegans. The C. elegans...

  15. Plasmids 101: Common Lab E. coli Strains

    Type
    Blog Post
    ...Lactose permease inactivated, lactose cannot be taken up by cell mcrA, mcrBC Inactivation of pathway that... is essential for recombination and general DNA repair Reduces plasmid recombination, increases plasmid...stability, reduced recombination relA or relA1 Relaxed phenotype, mutation eliminating stringent factor...them in 1885. E. coli are mainly found in the intestinal tract of animals. There are many different naturally... foreign (methylated) DNA mrr, Δ(mcrC-mrr) Inactivation of pathway that cleaves methylated adenine or...ara disruption of arabinose metabolism pathway Inability to utilize arabinose as a carbon source leuB...leuB β-isopropyl malate dehydrogenase inactivated Requires exogenous leucine source for growth proAB mutation...

  16. CRISPR 101: Cytosine Transversion Editors

    Type
    Blog Post
    ...hypothesized that the adenosine deaminase could also perform cytidine (C) deamination, converting the C base to... picture of chromatin than an accessible/inaccessible binary. A word of caution: CGBEs and indels Cytosine...sequences. These first base editors were both deaminases: they removed an —NH2 (amine) group from the ...consisted of Cas9 fused to an engineered adenosine deaminase capable of chemically converting adenosine (A)... started engineering a CBE to be worse at its original job. They removed the uracil glycosylase inhibitor...part of the likely editing mechanism: cytidine deaminase converts C to U, and UNG excises the new U to ...could explain why the edited U base opposite the original G is not primarily converted back to a complementary...

  17. Viral Vectors 101: An Introduction to AAV

    Type
    Blog Post
    ...promoters from subretinal injections of neonatal mouse eyes at two different ages." Retinal Degenerative...optogenetics, and chemogenetics experiments. Recombinant AAVs (rAAVs) The primary application of AAV is...meaning that all viral genes except ITRs (inverted terminal repeats – the sequences that flank the deliverable...deliverable DNA) are removed, resulting in recombinant AAVs (rAAVs) with maximum “trunk” space for genetic ...placed in your cell type of interest. Careful combination of promoters, gene switches, and/or serotype ...dividing tissues will lose expression quicker than terminally differentiated, non-dividing cells.   ...size of the ssAAV genome has a mutation in the terminal resolution site (TRS) to form a vector genome ...

  18. Plasmids 101: Dimers and Multimers

    Type
    Blog Post
    ...homologous recombination, growing a plasmid in a bacterial strain that is deficient in recombinase protein... sequencing, (which differ from the short-read Illumina MiSeq sequencing that Addgene uses.) However, ...Plasmid multimerization occurs via homologous recombination between two or more copies of the same plasmid...plasmid (Bedbrook & Ausubel, 1976). This recombination event produces a multimeric form of the plasmid with...article.   Long-read sequencing Addgene uses Illumina MiSeq NGS to perform whole plasmid sequencing ...made with BioRender.   Grow plasmids in recombinase-deficient strains Since plasmid multimerization...bi00850a028. PMID: 4878700. Bedbrook JR, Ausubel FM. Recombination between bacterial plasmids leading to the formation...

  19. Prime Editing: Adding Precision and Flexibility to CRISPR Editing

    Type
    Blog Post
    ...flexibility to the CRISPR editing world. The approach, originally published in Nature, is a “search-and-replace...HDR is typically less than 10%. In contrast, the original paper introducing prime editing demonstrated ~...into one strand, there’s a mismatch between the original sequence on one strand and the edited sequence...indels by 13-fold (Anzalone et al., 2019). PE3, as originally introduced, relies on the PE2 enzyme. PE4 and...including indels. Therefore, they engineered a dominant-negative mutant of the protein MLH1, a component...and DNA ligases to act first. PE4 and PE5, as originally introduced, rely on the PE2 enzyme. PEmax: Optimizing...(Yan et al., 2024). The team fused La to the C-terminal end of PEmax to produce PE7. PE7 significantly...

  20. Using AAV for Neuronal Tracing

    Type
    Blog Post
    ...onwards to other neuronal cells. Synapses at the terminals of axons form connections to dendrites of proximal...outlines neurons from their cell bodies to the terminals of their axons; while retrograde tracing outlines...outlines neurons in the opposite direction, from the terminals of their axons to their cell bodies. Anterograde... are some reports of bi-directionality. For predominately anterograde tracing, biotinylated dextran amines...rhodamine-isothiocyanate (RITC; Thanos et al., 1987) are used. For predominantly retrograde tracing, albumin protein labelled...AAV8, AAV9 Lung AAV4, AAV5, AAV6, AAV9 RPE (Retinal Pigment Epithelium) AAV1, AAV2, AAV4, AAV5, AAV8...conditional mutant mouse brain that expressed Cre recombinase only in pyramidal cells of the hippocampal region...
Showing: 221 - 240 of 935 results