Cytosine Base Editor
Cytosine Base Editor - Related Videos
07:13
Detection of Modified Forms of Cytosine Using Sensitive Immunohistochemistry
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Cited by 8 •
2016
Herein we describe a sensitive immunochemical method for mapping the spatial distribution of 5mC oxidation derivatives based on the use of peroxidase-conjugated secondary antibodies and tyramide signal amplification.
09:22
Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors
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Cited by 1 •
2021
People with BRCA1 mutations have a higher risk of developing cancer, which warrants accurate evaluation of the function of BRCA1 variants. Herein, we described a protocol for functional assessment of BRCA1 variants using CRISPR-mediated cytosine base editors that enable targeted C:G to T:A conversion in living cells.
07:14
Enhanced Gene Delivery and Expression using Intraosseous Injection of Chitosan Nanoparticles Encapsulated Adenine Base Editor Plasmids
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2025
Here, we present a gene therapy approach that delivers ABE-coated chitosan directly to the bone marrow by intraosseous injection.
02:27
DNA Base Pairing
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2020
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule, the amount of adenine (A) is equal to the amount of thymine (T); the amount of guanine (G) is equal to the amount of cytosine (C); and the sum of purines, A and G, is equal to the sum of pyrimidines, C and T (i.e., A+G = C+T). Later work by Watson and Crick revealed that in double-stranded DNA, A always forms two hydrogen bonds...
10:36
Genome Editing in Primary Mammalian Cells via Electroporation of Editor RNA
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2026
The delivery of genome editors as RNAs is a particularly potent means of modifying the genomes of primary mammalian cells and cell lines. The goal of this protocol is to deliver genome editors as mRNA into primary mammalian cells and cell lines, followed by targeted Illumina sequencing and analysis to quantify editing outcomes.
FAQs
The editing window determines which cytosines can be changed during a targeting event. Because the deaminase acts only on exposed single-stranded DNA, cytosines outside the accessible window may remain unedited even when the guide binds correctly. Guide placement therefore affects whether the intended base is reachable and helps explain variable editing outcomes in biological technique experiments.
The Cas protein's nickase activity helps direct repair toward the edited strand without introducing a double-strand break. After deamination creates uracil, cellular DNA repair and replication processes resolve the intermediate, producing the intended C•G-to-T•A substitution. This coupling between strand targeting and repair is central to the editor's precision and distinguishes its mechanism from break-dependent genome editing approaches.
Bystander substitutions arise when additional cytosines fall within the same accessible editing window. They can accompany the desired conversion, creating a mixture of sequence outcomes rather than a single intended change. Off-target effects represent another evaluation issue involving unintended editing beyond the desired target context. Both must be assessed when interpreting performance, but they describe different sources of unintended sequence change.
A typical workflow begins by selecting a guide RNA that places the desired cytosine within the editor's usable window, then applying the guide-directed Cas protein, nickase, and cytidine deaminase system to the target. Researchers subsequently examine the intended substitution, nearby bystander changes, and possible off-target effects. This workflow links construct design with sequence-level outcome analysis.
In biological techniques, this approach supports gene-function studies by changing a selected base without relying on a double-strand break. It can also help model disease-associated variants, allowing investigators to examine how a specific nucleotide substitution affects a biological system. The resulting data connect a defined sequence change with a measurable gene or disease-related phenotype.
Therapeutic development uses this approach to explore correction or introduction of sequence variants while requiring careful assessment of editing-window limits, bystanders, and off-target effects. These constraints influence whether a target is suitable and how confidently an outcome can be attributed to the intended substitution. The technique therefore offers precision-oriented editing, but experimental validation remains essential before biological or therapeutic conclusions.