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  1. Addgene's Cancer Collection Pages Connect the Research Community

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    Blog Post
    ...cancer-related complications each year. Despite these grim statistics, new strategies for attacking cancer are yielding...pedal of a vehicle, respectively. In the case of a mutation that turns a proto-oncogene permanently “on”, ...accelerator of a vehicle being stuck down. Similarly, a mutation that turns a tumor suppressor “off” is analogous...From proteins to pathways - Ras as a model When mutations do arise and cancer ensues, traditional chemotherapies...proteins are special because they are known to be mutated in as many as 30% of all cancers, especially those...pancreas and colon. Despite the prevalence of Ras mutations in a variety of cancers, Ras proteins have stumped...synthesizing compounds to bind specifically to their mutated residues. For Ras researchers, one of the most ...
  2. Summer SciComm Series: Modes of Communication

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    Blog Post
    ...can vary depending on factors like socioeconomic status and geographic location. For example, not all social...Otherwise, you’re going to drop your project like a hot potato or burn yourself out trying to slog through unappealing...communicate and I wholeheartedly encourage experimentation. You never know what's going to work. After...program? Comparing your desired outcome to the limitations and potential of your preferred platform before... your audience. Digital or print distribution.  Static. Can be difficult to convey an entire story or ...omitting details. Digital or print distribution.  Static. Often requires both artistic and scientific training...for children” or may need text for audience interpretation. Infographics Low Combines both words and...
  3. What's Your Organism? Expanding Genomic Tools via the NSF EDGE Program

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    Blog Post
    ...for plant adaptation and speciation. Their phenotypes are diverse and they inhabit all habitats - even 50...this wonder of the organism.   It’s not an overstatement to say that CRISPR/Cas9 editing is one of the...which these methods are presently unavailable.” As stated by one of the NSF program directors, this program...community is no small task. The EDGE program solicitation requires funded labs to rapidly disseminate ...possible nonetheless - the first example was of a pigmentation gene.   Genus Microtus (Zoe Donaldson) Voles...methods were available to create targeted gene mutations in anoles lizards or in any reptiles at all. But...was able to make an albino lizard with targeted mutations. Now what? What would you study first? They are...
  4. How to Deposit Your Plasmids with Addgene

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    Blog Post
    ...Relevant mutations/deletions" box to describe any mutations within your insert using standard mutation notation...consequences of that change. For example, "Mutated Aspartate 123 to Lysine (D123K), lowers biosensor affinity...pre-publication plasmids" and set a desired distribution status. You can submit "Published plasmids": This option...of the deposit. Select your desired distribution status: Hold for publication: we will initiate our ...fusion proteins contained in the plasmid, any mutations, and the intended purpose of the plasmid. Once...sequence the full plasmid and confirm features you annotate on this page. Figure 7: Enter information about...
  5. Quick Guide to Near-Infrared Fluorescent Proteins

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    Blog Post
    ..., the monomeric state of a probe leads to less interference with the oligomeric state of a fusion partner....8 33 State-of-the-art NIR FPs, which combine high cellular brightness and monomeric state, are highlighted...there is a Table that summarizes the properties of state-of-the-art probes, many of which you can find at... heme metabolism (Shemetov et al, 2017). Modern state-of-the-art NIR FPs can be used similar to GFP-like... by an apoprotein and protein expression level. State-of-the-art FPs (listed in Table 1) were optimized... Molecular brightness vs. iRFP713, % Oligomeric state Photo-stabilityc, t1/2, s pKa Brightness in HeLa...that this post helps you in getting to know the state-of-the-art NIR fluorescent probes and in choosing...
  6. Evolution of Lab Techniques

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    Blog Post
    ...particular gene mutation, southern blotting can be used to identify the presence of that mutated gene. In southern...the presence of the mutated β globin gene that causes sickle cell anemia. The mutation happens to destroy...from their evolution. Southern blotting and quantitative real-time PCR Southern blotting, named for its...the probe (for example, has the sequence of the mutated gene the researcher is searching for), then the...southern blotting being used to identify a gene mutation is the genetic test used for sickle cell anemia...analytical digests. A researcher can test the orientation of an insert in only a few hours at low cost ...Frank Speleman, and Jo Vandesompele. "Real-time quantitative PCR as an alternative to Southern blot or fluorescence...
  7. Evolution of Brainbow: Using Cre-lox for Multicolor Labeling of Neurons

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    Blog Post
    ...low resolution or were very time-intensive, necessitating the development of a new technique. In a structure...fluorescent protein coding sequences in opposite orientations. Cre-mediated excision removes one segment, ...neurons, the system also suffered from a number of limitations. First, the imaging of Brainbow mouse tissue ...Brainbow-1 and Brainbow-2 each contained a “default” state; for example, Brainbow-1.0 expresses RFP when the...construct has not undergone recombination. This default state was disproportionately expressed by a majority of...Brainbow-3.0, with the goal of overcoming the limitations listed above. First, they screened a variety ...mKate2 as the fluorophores; mOrange2 is the default state. In contrast, Brainbow-3.1 and -3.2 do not display...
  8. 27 Hot Plasmids from 2016

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    Blog Post
    ...dual luminescence-based co-immunoprecipitation) to overcome the limitations of other methods and allow...availability of enhancer sequences in different chromatin states. Alexander Stark and colleagues at the Research...differentiation, proliferation, and apoptosis. In humans, mutations that permanently activate Ras are found in one...develop better strategies for combating cancers. To facilitate innovative cancer research, the Reference Reagents...recombinase enzymes, as well as a dominant-negative mutator allele of the E. coli MMR protein MutL, all under...from, however, these methods are not without limitations. Some, such as the well-known yeast two-hybrid...plasmids are co-transfected and proteins are immunoprecipitated from the cells using the Protein A tag. The...
  9. Deaminet 2026: Breakthroughs in Base Editing, Deaminase Biology, and Therapeutic Translation

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    ...atomic resolution, to cancer biologists dissecting mutational processes, to medical researchers advancing base...biochemical, structural assays, cryo-EM, and computational approaches. PE6d’s higher editing efficiency...emerging clinical requirements. Together, these presentations underscored the need for more sensitive, modality‑matched...suppressor tRNA, enabling readthrough of nonsense mutations without lifelong dosing. Approximately 11% of ... model. Conceptually, PERT reframes nonsense mutations from a gene-specific problem to a stop codon–class.... oDNA: Immune-evasive DNA donors for pan-mutation editing Benjamin Kleinstiver (Massachusetts General... oDNA approach addresses a key barrier for pan-mutation editing strategies by enabling large sequence ...
  10. Generating Mouse Models Using CRISPR/Cas9

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    Blog Post
    ...incredibly useful for generating mutations by NHEJ and generating small mutations with HDR, when it comes to...technologies, a researcher would first introduce a mutation into a mouse embryonic stem cell (ESC) line, enrich...that had successfully incorporated the desired mutation, and then derive mice from these engineered ESCs...the chromatogram showing the telltale signs of a mutation introduced by CRISPR. The sequence started clean...done, 75% of the mice in this experiment showed a mutation! I looked out my window and I saw the Dorr Mountain... many, if not all, the mice carry a frameshift mutation. For knock in with a donor oligonucleotide, we...successful in deriving mice carrying the intended mutation. With a donor plasmid, the outcome is less predictable...
  11. Expanding the Targeting Scope and Editing Efficiency of Adenine Base Editors

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    ...continuous protein evolution through many rounds of mutations, selection, and replications per day.  The PACE...7.10 A mutagenesis plasmid controlling the phage mutation rate Phage infection results in a complete ABE...the phage is not infectious. The editing speed dictates which phage variants can propagate faster than...multiplexed: when tasked to correct two point mutations that hamper the expression of the fetal hemoglobin...this drawback, the lab introduced an additional mutation (V106W) into TadA-8e and the resulting ABE8e(TadA...sequences. Four DNA base swaps, so called point mutations that change C to T, G to A, A to G, and T to C...represent about two-thirds of known pathogenic point mutations. Together, cytosine and adenine base editors can...
  12. Cancer, Inflammation and Immunity - Harnessing the Body’s Defenses to Fight Cancer

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    Blog Post
    ...tumor-associated inflammation for therapeutic benefit ”as stated by the organizers. My overall impression from...The conference opened with a very interesting presentation by Professor Guido Kroemer from the Institut...cancer treatment (Ref 1). As described in the presentation, starvation or the use of caloric restriction...hepatocellular carcinoma, a cancer which can develop from a state of chronic hepatitis caused by hypernutrition and...consumption. Chronic inflammation is a dangerous state for the body to be in and usually self-limiting ...effects kick in trying to resolve the inflammatory state by inducing immunosuppressive measures, for example...immunosuppressive environment in turn may represent a favorable state for tumor progression (Ref 2). Future treatments...
  13. Transferable Skills Guide: Cross-team Communication

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    ...“no.” When there was room for misinterpretation, that misinterpretation was definitely happening. Our ...terminology of a new field. Annotate: When creating important documentation, including SOPs or project-...were leaving these meetings with different interpretations of what we discussed and decided. I needed ...definitions in our lexicon. We created documents and presentations, gave real life examples of when and how to ...frequently used words like this when starting rotations or my postdoc would have simplified the first ... ambiguous terms. Defining words and applying annotation can be particularly useful in academic labs when...
  14. Lambda Red: A Homologous Recombination-based Technique for Genetic Engineering

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    Blog Post
    ... screen plasmids for the appropriate mutations.  Point mutations and other subtle changes should be confirmed...molecular cloning; however, one of its biggest limitations is that sequence modifications can only be made...selectable and non-selectable sequences, point mutations or other small base pair changes, and the addition...nucleotides, while ssDNA substrate is best for point mutations or changes of only a few base pairs.  dsDNA Substrate...the two options, but these cells are prone to mutations and will have more unintended changes to their...Taq polymerase to generate insert ssDNA Point mutations or changing a few nucleotides 0.1-1% or 25-50%...effects of Gam expression and to limit spontaneous mutations that occur when Red is constitutively expressed...
  15. Early Career Researcher Toolbox: Finding Relevant Papers

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    Blog Post
    ...number of citations highly influenced by this paper. Influence is measured by the number of citations and the...extract important features such as influential citations, images, and key phrases. It also takes into account... account how papers are connected via citations, in order to return results that are more relevant to ...with greater influence, the average number of citations per year and the number of other manuscripts that... When you view a paper’s entry, the number of citations that paper has is displayed at the top of the ... the context of these citations. The number of manuscripts that cite the background, methods, or results...all publications by an author, total number of citations, and the number of publications that heavily cite...
  16. Pathways Over Time Plasmids Engage Students in Functional Genomics Research

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    ...projects in introductory labs. Genome projects use computational methods to identify genes by their similarities...proteins have acquired divergent functions due to mutations accumulated over time? Undergraduates can help...inexpensive. In addition, a complete set of well-annotated deletion strains is available (6). Methionine ...ura3 mutants and cannot grow without uracil supplementation (6). Expression of MET/Met genes from the pYES2.1...blotting in other experiments (Figure 2).   Complementation reveals conservation of function Students have...Addgene, to successfully analyze Met protein complementation. In the procedure diagrammed in Figure 3, students...promoter controls MET/Met gene expression, complementation should only occur when galactose replaces glucose...
  17. Split-BioID: An Improved Method for Studying Protein-Protein Interactions

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    Blog Post
    ...type of experiment is called a protein fragmentation complementation assay (PCA). In the Split-BioID method...FRET is another example of a protein fragmentation complementation assay that can be used to study binary...individual protein. The Bethune Lab has overcome this limitation by creating Split-BioID, a spatiotemporally controllable...Protein Interactions. Split-BioID is a protein complementation assay where BirA*, an E. coli biotin ligase...proteins. One caveat of Split-BioID is that the orientation of the BirA* fusion matters! Schopp et al saw...interact with the bait proteins. Another potential limitation of Split-BioID is its speed of labeling. BioID...
  18. Hot Plasmids: Summer 2025

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    ...heterogeneity dictates clonal responses to the acquisition of leukemic driver mutations. Cell Stem Cell... during differentiation after they introduced mutations that drive leukemia (Figure 3). Figure...Figure 3: Using LARRYv2 libraries for state-fate analysis in ex vivo HSC expansion cultures. A) Experimental...Experimental design. B) UMAP of cell states in ex vivo expansion cultures from days 7, 14, and 27. Reproduced...useful for studying the impacts of other cancer mutations and non-genetic diversity in human cancer stem...binds to AMPA receptor subunit GluA1 found at excitatory synapses (Rivera & Huang, et al., 2025). AF was...determined cells. This version of ATLAS works only at excitatory synapses; however, its modular design allows ...
  19. Polymerase Chain Reaction Overview and Applications

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    ..., or for generating mutated sequences for site-directed mutagenesis.  Quantitative polymerase chain reaction...genotyping. It’s extremely useful but is not as quantitative as other methods of PCR. Theoretically scientists...reaction, qPCR Quantitative polymerase chain reaction (qPCR) also known as real time PCR is a PCR technique...material in your sample.  qPCR can also be used to quantitate RNA levels using reverse transcription-qPCR (...sequences that are rare, for example, rare alleles or mutations. ddPCR also does not require a reference or standard...is determined and then analyzed using Poisson statistics to determine the concentration of the original...PCRs that use a single pair of primers, like those stated above. Multiplex PCR is also used in high throughput...
  20. Plasmids 101: How to Name Your Plasmid in 3 Easy Steps

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    ...contains a mutation or modification, this should be included in the plasmid name. Mutations are generally...abbreviation of the mutated amino acid currently at that position. In contrast, unmutated or Wild Type (wt...your plasmid name. This is often a 3-6 letter representation of the gene (or DNA sequence). pBACKBONE-hGene...change. The proper way to denote an amino acid mutation is to list the one letter abbreviation of the ...   Example: If the Glutamine at position 295 was mutated to an Alanine, Q295A.  Mutant version: pBACKBONE-Flag-hGene...
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