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...also use electroporation, the application of an electrical charge to cells, to increase cell membrane permeability... integrated phage remains dormant until it is triggered to enter the lytic cycle.   During both of these...they observed genetic recombination between two nutritional deficient E. coli strains that resulted in a ...cells. Electroporation on the other hand uses electrical pulses to create transient pores in the cell ...

...floats freely, depicted in the figure below. Once triggered by blue light, the CRY2 and CIB1 proteins heterodimerize...specificity as full-length Cas9 (flCas9). When triggered by blue light (470nm), paCas9-1 induced indel ...response to far-red light (730 nm). This nucleotide triggers the translocation of the protein BldD to the nucleus...constructs. This proof-of-concept model opens intriguing possibilities for optogenetic manipulation of...Gene editing Manna et al., 2019   NPPOC-caged trimethoprim (TMP) Cas9 fused to destabilizing domains (Cas9...

... on size is ultracentrifugation. Sedimentation equilibrium analytical ultracentrifugation yields an affinity...This post was contributed by guest bloggers Joachim Goedhart and Marieke Mastop from the Section of Molecular...on the dimerization tendency in living cells. Strikingly, the OSER assay reveals that tagRFP does not ...

...resources. There are three types of cognitive load: intrinsic cognitive load is the effort associated with a...even the most enthusiastic of learners.  What contributes to cognitive load?  Everything! Here are some...specialized knowledge and context I have spent years striving to obtain?” If the answer is yes, you will need... or to gloss over some aspects when needed. The trick is to communicate your key points well enough that...

...palindromic repeats separated by an 8-bp long asymmetric core spacer sequence. The asymmetry in the core...described above, a genetic modification can be restricted based on experimental constraints. This has been...site have been created, which contain a unique asymmetric spacer "NNNTANNN", where "N" indicates which ...system in your research? Do you have any tips or tricks, or clever cre-dependent techniques?  Let us know...

.... The main challenge with using AdV is that it triggers a strong immune response after in vivo administration...personalized medicine (2017).   1st Gen AdVs are stripped of regulatory genes E1 and E3. Without these genes...plasmid stock should be analyzed by endonuclease restriction digest or fully sequenced to confirm its integrity...chloride (CsCl) density gradients combined with ultracentrifugation to separate rAdV from other cellular debris...

...This post was contributed by guest bloggers Keith Pardee and Alexander A. Green. Zika background First...successful sensors to draw on as our assays grew more stringent, and it avoided any days of lost productivity ...when we needed additional expertise. Perhaps most striking is that there were seven institutions involved...and open approach by all involved definitely contributed to our ability to complete the project on such...

...prioritizes the sequence quality of the plasmids we distribute to scientists worldwide. Depositing scientists...sequence discrepancies can be caught prior to distribution. Catching these errors prevents future experimental...can pass through QC and be made available for distribution. In these cases, the QC team leaves a note on...written by Alyssa Shepard, with significant contributions from Alyssa Cecchetelli, Cary Valley, and Holly...

...in any format. Distribution status for your plasmids: Hold for Publication or Distribute pending QC. The...Gibson cloning, ligation-independent cloning, restriction enzyme, TOPO cloning, unknown, or other. ...or licenses that could prohibit Addgene from distributing the plasmid, select “yes” from the drop-down...

...that the five traditional rules didn’t need to be strictly followed in order to generate high-fidelity reactions...overhang set by uploading the set with the Type IIS restriction enzyme and thermocycler protocol. It will also...a circular or linear assembly. If you aren’t constricted to a specific number of fragments, you can also...correctly assembled phage genomes, it required a very stringent selection process and benefited from a longer ...

...data (Begley & Ellis, 2012; Baker, 2015). This contributes to an enormous amount of wasted money and time...Nguyen K, van der List D, Murray KD, Engebrecht J, Trimmer JS (2019) A toolbox of IgG subclass-switched recombinant...https://doi.org/10.1038/520295b Bradbury ARM, Trinklein ND, Thie H, Wilkinson IC, Tandon AK, Anderson ..., Bestagno M, Burrone O, Maynard J, Ferrara F, Trimmer JS, Görnemann J, Glanville J, Wolf P, Frenzel A...

...into the liquor of the cerebral ventricles (ICV, intracerebroventricular) to minimize tissue damage; however...Experimenter Interaction should be minimal and strictly controlled; optional handling animals Experiment...depending on the choice of channel protein, they can trigger neuronal excitation or inhibition upon light (or...

...This guest post was contributed by Sana Khan Khilji, a PhD student at the Max Planck Institute of Colloids...that UV light only kills microorganisms that it strikes directly. UV light exposure is also harmful for...way to prevent contamination. This sounds rather trivial, but often solves most problems before they occur...PubMed Central PMCID: PMC4047077. 2. Pagliara, Patrizia, et al. "Ostreopsis cf. ovata induces cytoskeletal...

... functional heterotrimers with endogenous Gβγ, enabling detection of activation triggered by endogenous... responsivity in screening ASAP3 variants. B) Electrical and optical recordings of spontaneous activity...sharing your experience with other researchers by contributing to the Addgene Antibody Data Hub.  Figure...

...and loss of plasmid diversity, so Addgene strives to distribute aliquots of the original library whenever...cheaper and easier. One library that Addgene distributes with a chemical transformation amplification ...with. In either case, it can be useful to run a restriction digest of your amplified library on a gel to ...

...antibodies against proteins embedded in membranes is tricky because they have fewer hydrophilic surfaces, require... randomized with a defined set of different trinucleotides (corresponding to different amino acids) in...exchange (FX) cloning technique which uses Type IIS restriction sites (Geertsma, 2013). Once the phagemids are...after a few washes, binding is detected using a colorimetric reaction. After the ELISA step, the narrowed-down...

...decided this protocol would be a worthy first contribution to the protocols.io community. Did I mention... protocols, including making LB agar plates, restriction digest of plasmid DNA, and bacterial transformation... was created in 1999 and allows scientists to contribute protocols or provide links to protocols on their...subscription-based software, Labguru does offer free trials and pricing options for academic labs, departments...

... this way: "Addgene is one of the leaders in distributing plasmids amongst the academic community. On ...has partnered with the BioBricks Foundation to distribute the physical DNA samples, for when that's the...central dogma at the genome scale, it's going to be tricky to tame the rest of a cell. The BIOFAB plasmids...Who owns computer-programming languages? That's trickier. Sometimes it's the developers. But, it turns ...

...dilution series should be run in duplicate or triplicate. The closeness of the data points generated by... the standard dilution series in duplicate or triplicate. Replicates allows you to calculate the curve...within the linear portion of the graph. It does restrict the dynamic range of your standard curve, so if...and mix samples very well.  Use duplicates or triplicates to increase the accuracy of your experiment.  ...

...Vector  Percent of Neurons Transduced   Cortex Striatum Cerebellum AAV.PHP.B (parental) 49 +/- 7% 36...of a transgenic mouse. 2. Cell-type-specific restricted transgene expression in the CNS and PNS Previously...promoter or enhancer now allows for cell-type-restricted expression in both the CNS (figure 5 in Chan ...These capsids can serve as powerful cell-type-restricted gene vectors for neurons, no transgenic mouse...

...This post was contributed by Max W. Shen from MIT, Alvin Hsu Harvard University, and David R. Liu from...statistics provided by Google on 6/4/20). Many countries entered lockdown for weeks to months, pausing ...requests. We received plasmid requests from 56 countries, though the data is heavily dominated by the U.S...noise to each of the terms which make up our distribution, resulting in the following hierarchical model...

...solution. Proteins and genomic DNA are removed by centrifugation. At this point, the plasmid DNA sample can ...binding DNA, the glass particles are pelleted by centrifugation and washed before DNA is eluted with water ...was free of agarose and could be digested with restriction enzymes.  Cellulose nucleic acid purification...phosphoric acid for 3 minutes followed by a short centrifugation for a total of four times before a wash with...

...new AAV approach using regulatory elements that restrict expression to this cell type. To this end, they...the size of DNA fragments. Depending on which restriction enzyme is used to cut the plasmids encoding the...are shared through Addgene without licensing restrictions. Use these instructions to prepare the PSU ... of telomere length regulation called telomere trimming and have proposed a role for TZAP, a Kruppel-like...regulating the upper-bound of telomere length. Telomere trimming can be assayed by looking for the production of...

...or G) is supplied as a dideoxyribonucleoside triphosphate (ddNTP) so that after its addition, DNA synthesis...attached to the flow cell membrane and have an electrical current running through them. DNA or RNA is pulled...each nucleotide passes through the nanopore, the electrical current recorded by the instrument changes. Base-calling...written by Alyssa Shepard, with significant contributions from Alyssa Cecchetelli, Cary Valley, and Holly...

...single crRNA The Feng Zhang lab used Cas13a from Leptotrichia shahii (LshCas13a) to begin to characterize ...et al., 2017). They characterized Cas13a from Leptotrichia wadei (LwaCas13a), using a superfolder GFP fusion...global RNA expression, cell stress, and RNA size distribution. When comparing LwaCas13a to shRNA, they found...community. Note: Cary Valley and Mary Gearing contributed to the update of this post. References 1. Abudayyeh...

...protein ticker tape Teaching an old antibody new tricks   New compact, efficient prime editors By Susanna....10.13.463862.    Teaching an old antibody new tricks By Ashley Waldron While IHC protocols typically...thick-section and whole-mount labeling techniques. The Trimmer lab’s anti-PSD-95 [K28/43R] recently passed their...antibodies in Addgene’s collection since we began distribution and has been verified to perform well in standard...

...envelope proteins from another virus to either restrict or broaden the host cell range (tropism). Pseudotyping...vesicular stomatitis virus G protein. VSV-G is a trimeric protein that binds phosphatidylserine and low-...preparation, VSV-G is stable and can withstand ultracentrifugation which helps scientists achieve a high titer..., Young JAT, Callaway EM (2007) Monosynaptic Restriction of Transsynaptic Tracing from Single, Genetically...

...and last updated Aug 12, 2021. This post was contributed by guest bloggers, Yiwen Zhang, a Ph.D. candidate... pTargetF with the ccdB gene containing BsaI restriction enzyme sites at its ends to generate pEcgRNA....that is 2.6 times higher when compared to the industrial strain. In our metabolic engineering case study...high-yielding strain which had 6 times the yield of the industrial strain. Not only is MUCICAT better, it is faster...

...made great strides to map brain regions and allocate specific functions to them. Electrical recordings...circuit by integrating neuronal signalling and triggering release of the stress hormone norepinephrine ...levels in general, or anxiety associated with psychiatric diseases such as schizophrenia or bipolar disorder...

...This post was contributed by the Mesothelioma Cancer Alliance. We have learned much about the causes ...techniques are currently being tested in clinical trials to detect mesothelioma earlier than ever. From ...been banned in the United States and many other countries, and it is still imported, exported, and used ...from this dangerous material. This post was contributed by the Mesothelioma Cancer Alliance. Additional...

...This post was contributed by guest blogger Natalie Niemi, a postdoctoral fellow at the Morgridge Institute...researchers with a valuable tool for understanding the contribution of phosphorylation to enzyme function. The development...recognizes a specific ‘open’ codon and utilizes this triplet to incorporate phosphoserine A Sep-tRNA synthetase...-through translation of many stop codons and detrimental effects on cell growth. The C321.ΔA strain was...

...pair of restriction enzymes. These enzymes, Nt.BbvCI and Nb.BbvCI, recognize the same restriction site, ... be sense. Does the orientation of the BbcVI restrict site matter? Most of the time no, but there are...directions, you just need to use a plasmid with BbvCI restriction sites in the same orientation as the gene or ...

...type and laser voltage. The voltage describes an electric potential that can be applied to the photomultiplier...photomultiplier inside the cytometer to increase the electric current and thereby the signal strength. So, we...dimensions displayed in the plot. (B) A more restrictive gate results in fewer cells being considered ... personal preference, some people like to make stricter gates while some like to make looser ones (Figure...

...development, and the shaping of the extracellular matrix. During immune responses, this same conformation...resulting in cells that elongated and morphed asymmetrically (Jo et al., 2022). By contrast, LVDP-binding...conferred less force, leading cells to spread into symmetrical circles. While elucidating the role of tension...Addgene to accelerate biomedical research by distributing antibodies developed by IPI. Our integrin antibodies...

... and frameworks contribute to the disulfide bond independent folding of intrinsically stable scFv. PLoS...there are many scFv-based therapies in clinical trials or already in the clinic (Bates and Power., 2019... antibodies for neuroscience research from the Trimmer lab Check out Addgene's latest project to develop...

...building and testing new products or methods, using metrics and feedback, taking a look at what works and what...partially reopened. But there were still many restrictions in place, most importantly, masks.  Besides ...Addgene. It’s why we exist, storing plasmids, and distributing them to labs that need them. The lab re-opened...very early in the pandemic with some incredibly strict safety protocols to keep Addgenies safe. Space ...

... be captured on streptavidin affinity beads or matrices. The bait protein can even target BirA* to specific...identify the proteomic map of the human mitochondrial matrix (Rhee et al., 2013) and determine the topology ...of mitochondria in living cells via spatially restricted enzymatic tagging." Science 339.6125 (2013): ...Biotinylation Other resources Proximity labeling review: Trinkle-Mulcahy, L. (2019). Recent advances in proximity-based...

...is far from perfect. One of the most limiting attributes of rats is their difficult to manipulate genome...making them useful for in vivo studies. These attributes make frog eggs some of the most useful tools ...utilization, Arabidopsis has made significant contributions to understanding plant and crop science alike...). E. coli as a Model Organism. News-Medical. Retrieved on September 18, 2020 from https://www.news-medical.net...

...This post was contributed by Damien Wilpitz founder and lead consutant at Experiment Designs Consulting...funding source. Major equipment includes large centrifuges, sequencers and analyzers, and any ultra sensitive...all of your minor tools, like pipets, or mini-centrifuges, etc. Be sure to capture as many of these tools...they don’t have the money. If the department has a strict budget, or a lack of resources, then ask for suggestions...

...This post was contributed by guest blogger, Jessica Sacher, a microbiology PhD student at the University...abilities (6). This can be accomplished using a restriction enzyme with a short recognition sequence (like...probing for cell-binding activity.  First, cut out 20 Petri dish-sized circles of nitrocellulose membrane and...inhibitor cocktail. Line the bottom of 20 empty Petri dishes with thick filter paper and saturate each...

... genetics of Wilms Tumour, which is a type of pediatric kidney cancer. This was particularly interesting...company. This particular company carries out clinical trials of drugs and treatments for external companies....else. During the interviews, I asked if I could contribute more towards the scientific aspects of the company...grateful for some help.  I also get the chance to contribute content to the Addgene’s Website and travel to...

...AAV vectors in complex biological systems can be tricky at best, and downright infuriating at worst. While... 2013, Figure 1. Used under Creative Commons Attribution License. Within the nervous system, remember... 2019, Figure 4. Used under Creative Commons Attribution 4.0 International License.   Inducible promoters...Engineered AAV Capsids Improve Transduction and Volumetric Spread in the CNS. Molecular Therapy - Nucleic...

...by chemical treatment or photobleaching or by stripping out the antibodies, then start over with the next...IF labeling of rat brain samples from the James Trimmer Lab, using recombinant antibodies with different... If you have questions or any favorite tips and tricks, leave a comment below. Happy imaging! References...Der List, D., Murray, K. D., Engebrecht, J., & Trimmer, J. S. (2019). A toolbox of IgG subclass-switched...

...and last updated Dec 17, 2020. This post was contributed by Jordan Ward who is an assistant professor .... Figure 1: In the background are 504 restriction digests of PCR products used to identify a single..., which makes screening extremely rapid. This stringent selection allowed me to optimize a range of editing...these improvements from the Mello lab resulted in strikingly high editing efficiencies, obtaining as many ...

...parts in a specific orientation using Type IIS restriction enzymes (Weber et al., 2011). It can be performed...express recombinant proteins within the mitochondrial matrix.     Figure 1: A chart with MoClo kit recommendations...production of a protein of interest, and improving the nutrient profiles within given crops are all possible through...applications (gene insert = Cas9 + gRNA), Addgene distributes specialized CRISPR kits too. The AspFlex Kit ...

...This post was contributed by guest blogger Derek Simon. Optogenetics is spreading through the neuroscience...series, I’m happy to share some of the tips and tricks and I’ve learned from numerous scientists at NIDA... to use optogenetics for? The technique is non-trivial; you don’t want to spend months doing surgeries...promoters and other genetic manipulations to help restrict expression to a specific neuronal subtype. However...

...favorite twitter #agarart accounts, Petri dish Picasso (@PetriPicasso) came together and delivered very ... was set very high from last year’s impressive entries, but our community of creative scientists delivered...

...Group, for these plasmids for the majority of the countries we ship to, first on a temporary and now on a ...information Edward Callaway   For researchers in countries with applicable export control exceptions for ...is accurate as of writing (Feb. 6, 2025), and we strive to keep our information updated, export controls...

...developed the plasmids, pPSU1 and pPSU2. When restriction digested with PstI or EcoRV, these plasmids generate...available from Addgene. Learn How to Analyze a Restriction Digest References 1. Henrici, R. C., Pecen, ... Miniprep Protocol Learn How to Analyze Your Restriction Digests Make Your Agarose Gel Other Resources...

...covering the basics of science communication, tips and tricks for sharing your science with others, and introducing... sharing our educational resources and tips and tricks for those new to the lab, along with some behind-the-scenes...some much-deserved vacations, sunshine, and beach trips, of course.    *not me, though. I don't dance.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      ...