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Updated: Jun 12, 2026

Efficient PAM-Less Base Editing for Zebrafish Modeling of Human Genetic Disease with zSpRY-ABE8e
Published on: February 17, 2023
Synergistic HMGN1 and VP64 Fusions Potentiate High-Precision and PAM-Flexible Base Editing
Xi Luo1,2, Yuyao Qu1,2, Zhengyan Ye1,2
1State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Collaborative Innovation Center for Modern Crop Production co-sponsored by Province and Ministry, Nanjing Agricultural University, Nanjing, China.
Researchers developed new base editors (BEs) using SpRY and cytidine deaminases, enhanced by HMGN1 and VP64. This advanced genome editing technology achieves high precision and efficiency across various organisms.
Area of Science:
- Molecular Biology
- Genetics
- Biotechnology
Background:
- RNA-guided CRISPR-derived base editors (BEs) enable targeted DNA base substitutions.
- Limitations include PAM sequence requirements and bystander editing, reducing precision.
Purpose of the Study:
- To develop novel base editors overcoming PAM limitations and enhancing editing precision.
- To improve the efficiency of base editors for broader genomic applications.
Main Methods:
- Coupling the near-PAM-less SpRY variant with truncated CDA1 cytidine deaminases.
- Systematic screening of DNA-binding proteins to identify enhancers.
- Fusion of HMGN1 and VP64 to boost editing activity.
Main Results:
- The SpRY-CDA1 combination enabled precise editing of nearly any genomic cytosine.
- Fusion with HMGN1 and VP64 significantly enhanced editing efficiency without compromising precision.
- High editing efficiency was observed in yeast and rice with minimal off-target effects.
Conclusions:
- The novel HMGN1-VP64-fused SpRY-CDA1 base editors offer a powerful tool for precise and efficient genome editing.
- This technology has broad applicability in gene therapy, crop improvement, and fundamental biological research.
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