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...guide for a refresher on CRISPR/Cas9.  Figure 1: Cpf1 is a single RNA-guided endonuclease of a class... than the multi-subunit complex employed by class 1 systems. A putative new class 2 nuclease, Cpf1 (CRISPR...that Cpf1 can tolerate mismatches at gRNA positions 1, 8, 9, and 19-23. Accordingly, the 3’ end of the gRNA...Most gRNAs directed low-frequency Cpf1 cleavage at 1-12 off-target sites; in contrast, SpCas9 may cleave...the diversity of CRISPR-based systems. References 1. Zetsche, Bernd, et al. "Cpf1 is a single RNA-guided...mismatches on modification by AsCpf1 (red) or LbCpf1 (blue). Mismatch positions are indicated below each ... this publication at Addgene. Makarova, Kira S., et al. "An updated evolutionary classification of CRISPR-Cas...

...Updated policy As of July 1, 2025, we are updating our Hold for Publication policy with two changes that...other scientists to use? We take this Hold for Publication policy seriously and appreciate the trust you...hold if they are clearly described in a journal publication. Plasmids will be released 3 years after the ...keep things moving internally. And remember, a publication isn’t required to share your plasmids! You can...can make your deposit available before publication and we can update the plasmids’ citation when the paper...

...that could be expressed and purified (Figure 1). Although a ~1% change in signal might not make a very powerful...whenever the magnet approached the sample (by less than 1%) and recovered after the magnet was removed. At first... the initial report in 2023.)     Figure 1: Fluorescence intensity of EGFP-FlavinTag in E. coli...Hayward et al. 2024 under CC-BY license.   Video 1: Fluorescence movie of E. coli expressing MagLOV while... tools for familiar applications. But how does one invent a tool for applications that don’t even exist...phenomenon, improve the tool, and develop new applications for magnetoresponsive proteins. Motivated by...organisms) are opaque, which makes most biomedical applications of these tools difficult or impossible. But ...

... Table 1: Key differences between original CAPTURE and CAPTURE 2.0 methods.   Applications of CAPTURE...by PCR or next-generation sequencing. Figure 1: Overview of the key steps of the CAPTURE method. ...ligases Expression system Stable cell line expressing 1) FLAG-biotin-tagged dCas9, 2) BirA, and 3) one or ...or more gRNAs Two separate lentiviruses delivering 1) a BioTAP-tagged dCas9 and an eGFP tag, and 2) gRNAs...The Xu lab presented three ways to use CAPTURE 2.0: 1. Multiplex capture of chromatin interactions The Xu... gene’s transcription. Sometimes enhancers are located thousands of base pairs away from the gene they...created a dCas9-based CAPTURE (CRISPR Affinity Purification in situ of Regulatory Elements) method. The ...

...Subscribe to CRISPR Blog Posts Applications of Cas13a   Figure 1: Using Cas13a as a diagnostic ...C2c1, C2c2 and C2c3 (short for Class 2, candidate 1, 2, or 3). C2c1 and C2c3 are related to Cpf1, but ...lacks the ability to cleave the RNA target.  Table 1: Comparison on Common CRISPR Enzymes Name  Enzymatic... This system, dubbed SHERLOCK (depicted in figure 1) has been used to differentiate strains of Zika virus...contributed to the update of this post. References 1. Abudayyeh, Omar O., et al. "C2c2 is a single-component...use, functional in most species, and has many applications. That said, SpCas9 is not the only game in town... makes this molecule unique, and the various applications of Cas13a. The origins of Cas13a: An RNA cleaving...

...directed base excision repair proteins. Nature Communications, 12(1), 1384. https://doi.org/10.1038/s41467-021...predictable by machine learning methods. Nature Communications, 12(1), 4902. https://doi.org/10.1038/s41467-021...for more details on how they work!) Figure 1: Base transitions are edits between the purine bases...R-loop structure. In order to bind DNA, Cas9 requires (1) a guide RNA, (2) a complementary DNA sequence, and...given the pithier name CGBE1, for “C → G Base Editor 1,” and had a C → G editing efficiency of up to 68%... the CGBE: DNA polymerase D2 (POLD2), exonuclease 1 (EXO1), and RNA binding motif protein X-linked (RBMX...transversions in human cells. Nature Biotechnology, 39(1), 41–46. https://doi.org/10.1038/s41587-020-0609-x...

...animal, those B cells are fused to myeloma cells at a 1:1 ratio and then cultured in a special medium called...antibodies that recognize proteins. Figure 1: Steps in the generation of hybridomas for monoclonal...Washington (DC): National Academies Press (US); 1999. 1, Generation of Hybridomas: Permanent Cell Lines Secreting...cells and antibody-producing B cells that cannot replicate, meaning that only hybridomas will survive this... Antibodies: Distinguishing Characteristics, Applications, and Information Resources. ILAR Journal 46:... the Addgene blog Learn more about research applications for antibodies in Intro to Antibodies Read about...

...unknown. Genome Biology, 22(1). https://doi.org/10.1186/s13059-021-02322-1  Pennacchio, L. A., Bickmore...,"rgb":"rgb(0, 82, 169)","rgba":"rgba(0, 82, 169, 1)"},"button_font":{"size":18,"styles":{"font-family...:"rgb(255, 255, 255)","rgba":"rgba(255, 255, 255, 1)"}}{% endraw %}{% end_module_attribute %}{% module_attribute...region of a gene to initiate transcription (Figure 1). Although all cell types share the same DNA sequence...feature the AIBS has capitalized on. Figure 1: Schematic of transcriptional regulation by an enhancer...Brain Science (AIBS). Scientists at AIBS have allocated tremendous time and resources to generate highly...data, analysis tools, and other scientific and educational resources on their website. You can find more...

...that have now become hallmarks of ideal FP timers: 1. Ratiometric determination of expression time The ...the FT series matures from blue to red (see Table 1 for emission and absorption spectra). Subach et al...times and varied blue-red maturation times (Table 1). These separate proteins should be useful for monitoring...cellular events occurring at varied time scales.  Table 1: Monomeric FP Timers and Associated Plasmids from ... know in the comments section below! References 1. Terskikh, Alexey, et al. ""Fluorescent timer": protein... (green or blue) within a population of timer indicates the age of the pool: the higher the ratio, the...-FT-N1 pTRE-Slow-FT pBAD/HisB-Slow-FT -  Applications of fluorescent protein timers FP timers have...

...evaluate all of the pegRNAs in one experiment (Figure 1). Through this method, we found key determinants of...diverse edit types and cell contexts. Figure 1: High-throughput screening of pegRNA efficiency and...Article 3. https://doi.org/10.1038/s41576-022-00541-1 Kim, H. K., Kim, Y., Lee, S., Min, S., Bae, J. Y.,...DNA repair determinants. Nature Biotechnology 2023, 1–11. https://doi.org/10.1038/s41587-023-01678-y Li,...editing systems in multiple cell types. Cell, 186, 1–17. https://doi.org/10.1016/j.cell.2023.03.034 Resources...genome editing technology that allows precise modifications of DNA (replacements, small insertions, and ...configurations can be used to introduce specific target modifications. Since this means we could design hundreds to...

... arms. Nat Chem Biol., 308(20): 1-9 (2020). 10.1038/s41589-019-0432-1 Mehdi Banan. Recent advances in ...before attempting knock-ins by HDR.   Fig. 1: Early steps in repair of a DNA double strand break...traditionally have larger homology arms in the 500 bp to 1 kb range, however, shorter homology tracts have recently...breaks. J Biol Chem., 293(27): 10524-10535 (2018). 1 10.1074/jbc.TM118.000372 Yang, H., Ren, S., Yu, S....cut site location Position your CRISPR cut site as close as possible to the knock-in location. HDR depends...sequence to be incorporated at a precise genomic location, with little to no room for error. It’s no surprise...nutrients in their media, they will not undergo DNA replication, so make sure you are keeping an eye on those...

...transcription activation system co-opted from yeast (1). It is a Drosophila geneticist’s main workhorse to...he still reads “#” as a “pound symbol”. References 1. A. H. Brand, N. Perrimon, Targeted gene expression... A Fly Geneticist’s Swiss Army Knife, Genesis 34, 1–15 (2002).PubMed PMID: 12324939. 3. S. E. McGuire,...Versatile Toolkit for Gene Expression in Drosophila, 3, 1–10 (2015). PubMed PMID: 21356876. 5. J. Chow, Z. Marka...as overexpression of each gene individually. Applications of the Gal4/UAS system There are a number of...lines. In the meantime, be sure to browse the publication references and web links from my first post and...

...incubation of 1° and 2° Must use different species and/or different IgG subclasses of 1° for multi-color...displacement 2° incubation can be skipped by pre-binding to 1° Monovalent Monoclonal Only anti- rabbit and -...dyes are also commercially available. References 1. Pleiner, T., Bates, M., & Görlich, D. (2017). A toolbox...NIH’s Developmental Studies Hybridoma Bank (DSHB). 1 ml of antibody-containing hybridoma supernatant is...in bacteria and extracted with common protein purification methods. Read on to learn more about nanobodies..., Alexa Fluor 568, or Alexa Fluor 647 before application to the sample. Staining with this multi-color...PubMed PMID: 29263082 Find plasmids from this publication at Addgene. 2. Bates, M., Böhning, M.I., Chug...

...origin of replication (oriP) element and the cis-acting EBNA-1 from Epstein-Barr virus. EBNA-1 binds oriP... be completely removed.  Replicating oriP/Epstein-Barr nuclear antigen-1 (EBNA1) based episomes: These...reprogramming method Most iPSC research falls into two categories: 1) studies focused on better understanding the...Difficult to purify reprogramming proteins. Table 1: Key Features of Different Methods for Generating ...plasmid-based expression requires serial transfection of 1 or 2 plasmids that express the reprogramming factors ...iPSCs experiences in the comments below! References  1. Sano, Masayuki, Minoru Iijima, Manami Ohtaka, and...Methods figures were adapted from this reference. 1. Malik, Nasir, and Mahendra S. Rao. "A Review of the...

...sighted readers.    Figure 1: An image from AAV Purification by Iodixanol Gradient Ultracentrifugation... it? The image in Figure 1 appears on our protocol page for AAV Purification by Iodixanol Gradient Ultracentrifugation...intended.)  Steps to clear writing Let’s use Figure 1 as our example. Remember, our goal is to use words... share with the rest of the workshop.  For Figure 1, Addgene chose this alt text: "The left panel is a...principles we developed to use in our website and educational content conflicted with plain language guidelines...Stupid, overwhelmed, discouraged, tired…words that indicated there were many barriers between our audience ...

...production of the pro-inflammatory cytokine interleukin IL-1 beta in the dorsal raphe nucleus (DRN), a region thought... a transgenic mouse harbouring a Cre-dependent IL-1 beta overexpression cassette. Expression of Cre in...in these neurons turns on overexpression of IL-1 beta. They tested the mice in a series of behavioral ...risky), or a closed arm (safe). Mice with higher IL-1 beta production spent more time in the open arm and... part of the apparatus, it turned out that the IL-1 beta overexpressing mice spent more time in the risky...have made great strides to map brain regions and allocate specific functions to them. Electrical recordings...long-lasting antidepressant effects." Nature communications 10.1 (2019): 223. PubMed PMID: 30644390. PubMed...

...such as IL-8, IFNγ, and colony stimulating factor 1 (CSF-1). Additionally, tumor cells recruit regulatory...introduced the “Three Es of Immunoediting” nomenclature. 1. Eliminate - Latent tumors are recognized by effector...the tumor, activates hypoxia inducing factor (HIF-1), which promotes the production of VEGF to increase...This study used CRISPR gene editing to knockout PD-1 on immune cells harvested from patients and thereby...exploring new avenues in healthcare.   References 1. Vinay, Dass S., et al. "Immune evasion in cancer:...lymphoblastic leukaemia in children and young adults: a phase 1 dose-escalation trial." The Lancet 385.9967 (2015)...immune response to the development of tumors is a complicated and dynamic phenomenon that is interestingly ...

... emailed submission) in the Deposit menu: Figure 1: Begin the deposit process by clicking "Submit Online...the plasmids, or (for deposits submitted after July 1, 2025) after three years on hold, Addgene staff may...cases Please contact us at [email protected] or +1 (617)-ADDGENE (233-4363) if your deposit falls into...Addgene?" or contact us at [email protected] or +1 (617)-ADDGENE (233-4363) with additional questions...strain. Please contact us at [email protected] or +1 (617)-ADDGENE (233-4363) if you’d like to distribute...page so that any data you enter is not lost.   Step 1: Sequences, Maps, and Files Please provide any full...a 1.5 mL microfuge tube at a concentration of 0.1–1 µg/µL (or bacterial streaks, if you prefer). If you...

... all replicate in E. coli, which is the most commonly used bacteria in lab manipulations. Table 1 has ...https://doi.org/10.1007/978-1-61779-197-0_19  Meyer, R. (2009). Replication and conjugative mobilization...reduced metabolic load (Meyer 2009). Figure 1: Idealized examples of a narrow host range plasmid...species these plasmids are compatible with.  Table 1: Non-exhaustive list of common broad host range plasmids...for DNA cloning in Gram-negative bacteria. Gene, 70(1), 191–197. https://doi.org/10.1016/0378-1119(88)90117...ori2, ori3) and replication initiation proteins (RepA, RepB) necessary for replication in various hosts...the ori and allow for replication. However, if plasmids have their own replication machinery such as Rep...

... the example shown in Figure 1, injected retrograde AAVs at one location result in opsin expression in...from the paper for designing experiments with AAV: 1. Getting your viral vector into your cell of interest... administration routes for neuroscience see Table 1 from the paper. 2. Manipulate your cell of interest...experiments! Late last year, we hosted our first AAV Education and Development workshop aimed at brainstorming...even further. For example, injecting AAVs at one location can result in expression of an optogenetic payload...