...their efficiency at transducing different brain regions. Although AAV2 can transduce many tissue types,...Axonal Transport It has been demonstrated that certain serotypes can undergo axoplasmic transport. These...of neurons (retrograde transport) or towards the synapse (anterograde transport), which is a possible ...retrograde and anterograde transport, but they also have similar transport characteristics (velocities...strong CNS tropism (4). If axonal transport is not desirable, transport can be reduced by injecting a smaller...scAAV) (7). As single stranded DNA viruses, AAVs normally require second strand synthesis before gene ...Simon Rumpel. "Analysis of transduction efficiency, tropism and axonal transport of AAV serotypes 1, 2, 5...

... by the bottom strand versus nicking the bottom strand first followed by the top strand. Both produced...complementary mutant strand (step 2 and 3). Then the uracil-labeled template strand is degraded by uracil...present on both strands of the plasmid. The ssDNA template is generated by transforming a backbone phagemid...ExoI then fully degrades the nicked strand. Synthesize mutant strand: A mix of degenerate primers and the...synthesized DNA strand. Each degenerate primer set contains three consecutive randomized bases (NNN) at...Degrade wild-type template strand: Next, the opposite wild-type DNA strand is nicked by the BbvCI variant...step 1. Then this strand is degraded with ExoIII and ExoI. Synthesize 2nd mutant strand: The second mutant...

... polymerase and transcription factors. Since the promoter region drives transcription of a target gene...repressor then prevents transcription from occurring, which means that transcription is now OFF.   We’ll...tetracycline-controlled transactivator (tTA). They fused TetR with the transcriptional activation domain VP16...other. For example, the GAL4 transcription factor cannot drive transcription from the QUAS promoter, and...and the QF transcription factor cannot drive transcription from the UAS promoter. This is important because...Repressible: An activator protein is bound, turning transcription ON. When a repressor binds the activator protein...cannot bind the promoter sequence anymore and transcription is turned OFF. Negative Repressible: A repressor...

...the usual transfection drawbacks: transient expression and needing to work with a transfectable cell line...Cassettes transfection gRNAs expressed from a polycistronic transcript  Requires co-transfection of Cas9...Cassettes transfection gRNAs expressed from a polycistronic transcript Requires co-transfection of Cas9  ...expression platforms: transfection, lentiviral transduction, and AAV transduction.  In most of Zetsche ... rely on transfection of more than one vector to express the gRNAs and Cas9. Co-transfections can lead... GFP tag were transfected on a single plasmid. This is versus 2.4% of cells transfected with a pool of...multiple applications (in vitro, in vivo, transfection, viral transduction) for simultaneous multi-gene editing...

...Transcription, translation, and prone to degradation – those are the words that describe RNA! Double ...in our cells in the single strand form, but double stranded RNA and RNA:DNA hybrid molecules both exist...arise from a ssRNA engaging one strand of a dsDNA molecule; the 3-stranded structure produced is known as...intermediates in the process. These transcription-coupled R-loops are transient in nature and will dissociate...dissociate when gene transcription is complete. However, transcription of thousands of genes is constantly occurring...engages one strand of a dsDNA molecule, it does so at the expense of the unpaired DNA strand. A ssDNA molecule...Double stranded? Well, that’s just for DNA – right? RNA performs almost all of its biological functions in...

...that increase transduction efficiency, none allow for simple and efficient transduction of both the CNS...capsids were packed with a GFP transgene and GFP intensity and transduction efficiency of neurons were measured... Table 1: Transduction efficiency of AAV-PHP.B versus AAV-PHP.eB in the CNS. A GFP transgene was packaged... Table 2: Transduction efficiency of AAV.9 versus AAV.PHP.S in the PNS. A GFP transgene was packaged...the generation of a transgenic mouse. 2. Cell-type-specific restricted transgene expression in the CNS...introduce a transgene into a specific cell type in the brain, you needed to make a transgenic mouse. Combining...AAV) vectors are the most frequently used gene-transfer tools in the study of the brain and spinal cord...

...changing transfection ratios can affect transfection efficiency. For some transgenes, transfection optimization...containing structural genes and a transfer plasmid carrying the transfer gene. By dividing the viral elements... structural elements, envelope, and transfer gene are transfected into a packaging cell line, usually ...may not translate to the target cell line. To overcome this issue, we recommend using a range of doses...systems such that it no longer requires the viral transactivator, Tat. For more information on the different...requirement for additional DNA can impact the transfection efficiency of the packaging cell line and thereby...recommended that you try a few different ratios of transfer, envelope, and packaging plasmids in order to ...

...binding to the template strand (strand used by RNA polymerase II for transcription) are more effective for...complex. This complete transfection mix, i.e. csRNP plus ssODN, is then transfected into stem cells. Cells... were transfected in 96-well format using an Amaxa Shuttle device; 5 days after the transfection, the ...template strand. Therefore, I suggest that picking a crRNA complementary to the template strand could increase...Prepare cells for transfection, add csRNP and ssODN to the cell suspension, transfect and let cells recover...selection of transfection buffer and electroporation pulse program to achieve high transfection efficiency... contact me at Pooran.Dewari@ed.ac.uk. Keep pipetting and happy genome editing! Pooran Dewari is a postdoc...

...protocols can transfer CRISPRi into a single bacterial strain, such as a B. subtilis, or a narrow range of bacterial...can be introduced into a broader range of bacteria. Once transferred, Mobile-CRISPRi stably integrates...bacterial Tn7 transposon system. This system has two parts: a plasmid expressing the Tn7 transposition genes ...chromosomal copy of the RP4 transfer machinery mobilize these plasmids for transfer to recipient cells during...: A Tn7 transposon containing the CRISPRi components and a plasmid with the Tn7 transposition genes are...disease. However, the rate of transfer was variable. They measured transfer rates by comparing the number... P. mirabilis, had only ~1 transfer per 1,000,000 colonies. Higher transfer rates are better suited for...

...., 2017), axonal transport  (Murlidharan et al., 2014), and postsynaptic transmission (Oh et al., 2020... S. (2013). Analysis of Transduction Efficiency, Tropism and Axonal Transport of AAV Serotypes 1, 2, 5...Tetracycline-Dependent Transactivator Correlates with Long-Term Doxycycline-Regulated Transgene Expression in ...Specificity of gfaABC1D-Driven Transgene Expression in AAV-Mediated Gene Transfer. Molecular Therapy - Nucleic...great in a GABA neuron, for instance, may not transduce the adjacent norepinephrine neuron at all. There... more than one serotype that will efficiently transduce your cells. In fact, we usually recommend testing...primate. Likewise, in vitro efficacy doesn’t always translate to in vivo efficacy. You’ll therefore need to ...

...expression, Aranda-Díaz et al transformed yeast with both a GAL4/estradiol controlled transcription factor ... a broad pH range. The four biometric probes successfully targeted endosomes under a range of pH conditions...ligand binding domains and the MSN2 transactivation domain. Transcription factor activation via the appropriate...progesterone controlled transcription factor as well as reporters specific to each transcription factor. They then...together. Aranda-Diaz et al additionally show that it is possible to use synthetic transcription factors... levels. That is, if transcription factor 1 controls expression of transcription factor 2, which directly...by modulating the induction of transcription factors 1 and 2. See Aranda-Díaz et al. for more information...

...loxp pair, and flips the transgene into the correct orientation for transcription. Upon recombination one...end of the transgene. Since loxp and lox2272 can not recombine, this ensures that the transgene is no longer...flank a transgene (homologous pairs) or used different scrambled sequences to flank the transgenes (non-...Rumpel S (2013) Analysis of Transduction Efficiency, Tropism and Axonal Transport of AAV Serotypes 1, 2, 5...gene expression in a specific cell type rely on transgenic models that express recombinases like Cre or ...recombinase-dependent AAV vectors for selective transgene expression. While this is a powerful experimental...sequence prior to an ATG start codon to prevent transcription in cells where the recombinase was not present...

...optimized your transduction conditions, you’re ready to transduce! Addgene has a transduction protocol you... the pooled library is transformed into E. coli for amplification. Transformed E. coli are allowed to ...functional titering and optimize transduction efficiency. Transduction efficiency can vary with titer, ...cells to transduce, you may want to consider spinfection. Spinfection is the process of transducing cells...this post, I’ll walk you through how to prep and transduce your pooled library.  Pooled libraries Scientists...lentiviral production steps before you can start transducing your virus. Let’s start there!     Figure...sequencing to confirm library representation. Transfection of the DNA pooled library and appropriate packaging...

...effects of the transfection itself (i.e., the vector used in transfection, transfection reagent, or transfection...experiments employ transfection, negative, positive, and replicate controls.  Transfection controls: empty...vector and internal control A transfection control measures transfection efficiency and enables observation... allows you to examine if the transfection reagents or the transfection process itself has any cytotoxic...Another type of transfection control is an internal control vector, which measures transfection efficiency....luciferase) that is either co-transfected with the test plasmid or transfected into a separate well of your...due to the original transfection conditions. Now that we have successfully transfected our cells (Figure...

...control exactly in which locus your transgene ends up (1): Random insertion has the advantage that you...you need to combine multiple transgenes in one fly, having the transgenes in different loci allows for...use? Random insertions take longer because you need to determine in which chromosome your transgene has...brief introduction as to how you can engineer new transgenic flies to study your favorite gene (YFG).  Sometimes... is thrillingly new, you might have to make a transgenic fly in order to study it. The process is fairly...plasmids at Addgene Choosing a vector to generate a transgenic fly There are a few important points to consider...genome? Some vectors incorporate into the genome randomly, while others use attP sequence docking sites ...

...light to regulate transcription, also includes light-regulated histone methyltransferases and deacetylases...CRISPR Epigenetics resource. Transcriptional activation p300 acetyltransferase dCas9 fused to the catalytic...other Tet1 delivery systems. Transcriptional repression DNA Methyltransferase 3 Alpha (DNMT3A) Vlatka Zoldoš... PuroR enable sorting and selection of transduced cells. Grant Challen’s lab also created constitutive...associated with transcriptional repression. Created with BioRender.com. DNA Methyltransferase MQ1 Margaret...Fusing dCas9 to a transcriptional activator like VP64 or VPR activates transcription, whereas dCas9-KRAB...domain, could mediate demethylation and induce transcription at CpG regions of various promoters. Other researchers...

...most cases, interested in transferring genes to mammalian cells (i.e. transferring DNA), yet retroviruses...still direct the translation of proteins because they integrate this reverse-transcribed DNA into the host...genome and then use cell machinery for transcription and translation. Here, we will discuss several aspects...worthwhile to generalize the idea of “transduction” to mean any transfer of material from the virus to the...a turn of phrase — “pseudotransduction” — to describe the direct protein transfer of RT, which would actually...After uncoating, reverse transcription follows the release of the two strands of viral RNA and of the ...structural proteins expressed from a reverse-transcribed piece of DNA called a “provirus.” This DNA is...

...modify a given gene. CRISPR-tranposons By combining CRISPR editing and transposons, the Sternberg and Zhang...developed CRISPR-transposons. The Sternberg lab's system called INTEGRATE (Insertion of Transposable Elements ... CAST (CRISPR-associated Transposase) both enable gRNA-directed transposition. INTEGRATE consists of four...multi-spacer CRISPR array, CRISPR-transposons can be multiplexed. Transcriptional repression (CRISPRi) in bacteria...proteins involved in the activation of transcription including transcription factors, phage proteins, and RNAP... unlike other organisms, CRISPR-induced double stranded breaks are lethal because the non-homologous end-joining...ineffective in bacteria, CRISPR-induced double stranded breaks (DSB) are lethal. Addgene depositor Luciano...

...Addgene Help Center: Tech Transfer Technology Transfer Information Tech Transfer News: A Reintroduction ...Addgene account for Tech Transfer Offices. They’re packed with tech transfer resources (summaries, electronic...question? Refer them to Addgene’s Tech Transfer Team: techtransfer@addgene.org Congratulations to the Golden...stats and strategies with tech transfer offices. Drop us a line at techtransfer@addgene.org. Albert Einstein...requests from Addgene MTA: material transfer agreement Technology Transfer: the exchange of intellectual property...addgene.org identifies the hold-up. Your Material Transfer Agreement is stuck in “pending.” Fear not, there... to make MTA turnaround faster with technology transfer offices (TTOs). The latest of these efforts is...

...protein Tat. Although CPP fusions can translocate a cell membrane, the presence of the CPP may alter protein... (78-79% after two rounds of transduction.) Compared to CCP transduction, iTOP is at least four times ..., and cell death post-transduction is low. Neuronal stem cells transduced with iTOP resulting in...lab suggests that primary cells may be better transduced using only protein. Read on for a description...description of the lab’s iTOP protein-only transduction method and its potential applications to CRISPR/Cas9 genome...genome editing.   Protein-only transduction? Niels Geijsen’s group in Utrecht wanted to pursue a nonviral...nonviral strategy for transducing primary cells. What if, instead of supplying a DNA construct, they could...