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Updated: Sep 12, 2025
07:31
Efficient PAM-Less Base Editing for Zebrafish Modeling of Human Genetic Disease with zSpRY-ABE8e
Published on: February 17, 2023
1.3K
High-efficiency base editing for nuclear and mitochondrial DNA with an optimized DYW-like deaminase
Jiyeon Kweon1, Soomin Park2, Mi Yeon Jeon3
1Department of Cell and Genetic Engineering, BK21 Project, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea; Stem Cell Immunomodulation Research Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea.
Summary
Scientists developed SsCBE, a new CRISPR base editor using a novel deaminase for precise genome editing. This tool enhances efficiency and specificity, expanding gene editing capabilities for research and potential therapies.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- CRISPR-based cytosine base editors offer precise genome editing without double-stranded DNA breaks.
- Traditional editors rely on limited APOBEC/AID or TadA deaminase families.
Purpose of the Study:
- To introduce and characterize SsCBE, a novel CRISPR cytosine base editor utilizing a new deaminase scaffold.
- To evaluate SsCBE's efficiency, specificity, and versatility in various applications.
Main Methods:
- Engineered SsdAtox, a DYW-like deaminase from Pseudomonas syringae, for improved base editing.
- Developed SsCBE and tested its performance in cellular and organismal models.
- Utilized diverse delivery methods, including virus-like particles, for SsCBE application.
Main Results:
- SsCBE demonstrated significantly enhanced base editing efficiency (up to 8.4-fold) and specificity.
- Reduced cytotoxicity compared to existing base editors.
- Successfully applied SsCBE for targeted cytosine base editing in mouse zygotes and mitochondrial DNA.
Conclusions:
- SsCBE represents a novel and versatile CRISPR base editor with a distinct deaminase scaffold.
- Offers improved efficiency and specificity, expanding the genome editing toolbox.
- Has broad utility for basic research and potential therapeutic applications.
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