Efficient genome editing in Claviceps purpurea using a CRISPR/Cas9 ribonucleoprotein method
Lu Yu1, Meili Xiao1,2, Zhihua Zhu1,2
1CAS-Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 300 Fenglin Rd, Shanghai, 200032, China.
Synthetic and Systems Biotechnology
|February 28, 2022
Summary
Researchers developed an efficient CRISPR/Cas9 genome-editing system for Claviceps purpurea using ribonucleoprotein complexes. This system significantly improves gene knockout efficiency, aiding the study of ergot alkaloid biosynthesis.
Area of Science:
- Mycology
- Molecular Biology
- Biotechnology
Background:
- Claviceps purpurea produces pharmacologically vital ergot alkaloids (EAS).
- The complete EAS biosynthetic pathway remains uncharacterized due to limitations in genome-editing tools for C. purpurea.
- Existing methods like homologous recombination (HR) and in vivo CRISPR/Cas9 have low efficiency.
Purpose of the Study:
- To develop an efficient genome-editing system for Claviceps purpurea.
- To overcome the limitations of current gene manipulation techniques in C. purpurea.
- To facilitate the elucidation of the EAS biosynthetic pathway and enable future research.
Main Methods:
- Development of an efficient genome-editing system using in vitro assembled CRISPR/Cas9 gRNA ribonucleoprotein (RNP) complexes.
- Application of the CRISPR/Cas9 RNP-mediated HR system for gene knockout.
- Targeting three genes: ura5 (uridine biosynthesis), rac (hypha morphology), and easA (EAS production).
Main Results:
- Achieved high gene knockout efficiencies ranging from 50% to 100% for three target genes.
- Generated a uridine auxotrophic mutant (ura5 knockout).
- Created a mutant with altered hypha morphology (rac knockout) and a non-EAS producing mutant (easA knockout).
Conclusions:
- The developed CRISPR/Cas9 RNP system offers a significant advantage over conventional and in vivo CRISPR/Cas9 methods for C. purpurea genome editing.
- This efficient system will accelerate the characterization of the EAS biosynthetic pathway.
- The system provides a powerful tool for future basic and applied research in C. purpurea.
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