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CRISPR-Cas9-Mediated Genome Modifications in Zebrafish
Yusuke Kamachi1, Atsuo Kawahara2
1School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada-cho, Kami, Kochi, Japan.
Methods in Molecular Biology (Clifton, N.J.)
|February 11, 2023
Summary
CRISPR-Cas9 gene editing in zebrafish now allows precise DNA insertions (knock-in) using microhomology-mediated end joining or single-stranded DNA donors, overcoming previous limitations in targeted gene modification.
Area of Science:
- Molecular Biology
- Genetics
- Zebrafish Models
Background:
- CRISPR-Cas9 technology enables genetic modifications in zebrafish.
- The system efficiently causes gene knockouts via DNA double-strand breaks (DSBs).
- Targeted DNA insertion (knock-in) remains challenging with standard CRISPR-Cas9.
Purpose of the Study:
- To summarize CRISPR-Cas9-mediated genome modification strategies in zebrafish.
- To highlight advancements in targeted gene knock-in techniques.
- To present methods for precise exogenous DNA integration.
Main Methods:
- Utilizing CRISPR-Cas9 to induce targeted DSBs.
- Employing microhomology-mediated end joining (MMEJ) for precise gene integration.
- Using long single-stranded DNA (ssDNA) donors for knock-in of short sequences.
Main Results:
- Established MMEJ-mediated targeted integration of exogenous genes in zebrafish.
- Developed a method for knocking in ~200 nt sequences using ssDNA donors.
- Demonstrated successful CRISPR-Cas9-based genome modification strategies.
Conclusions:
- CRISPR-Cas9 genome editing in zebrafish has advanced significantly.
- New methods enable precise targeted gene knock-in, overcoming previous limitations.
- These strategies offer powerful tools for zebrafish genetic research.
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