A simple and efficient cloning system for CRISPR/Cas9-mediated genome editing in rice

Area of Science:

• Genetics and Genomics
• Molecular Biology
• Bioinformatics

Background:

• Genetics and bioinformatics studies offer insights into trait genetics but pose challenges for gene function validation.
• CRISPR/Cas9 is a powerful genome editing tool, but its application is hindered by complex cloning procedures.
• Existing methods for constructing CRISPR/Cas9 expression clones involve multiple PCR steps and traditional cloning techniques.

Purpose of the Study:

• To develop a simplified and efficient one-step system for constructing single-guide RNA (sgRNA) expression cassettes in plant binary vectors.
• To accelerate the process of creating expression clones for CRISPR/Cas9-mediated genome editing.
• To reduce the time and cost associated with generating CRISPR/Cas9 reagents.

Main Methods:

• Developed an optimized multiplex PCR strategy to generate sgRNA expression cassettes.
• Utilized overlapping PCR for single cassette generation and a single round of PCR for dual cassette amplification.
• Integrated unpurified PCR products directly into LR or Golden Gate reactions with destination vectors.

Main Results:

• Successfully constructed expression clones for CRISPR/Cas9 genome editing within 36 hours.
• Demonstrated a significant improvement in efficiency and cost-effectiveness compared to traditional methods.
• Validated the system's efficacy through Agrobacterium-mediated genetic transformation in rice.

Conclusions:

• The developed one-step system offers a highly efficient and simplified procedure for constructing CRISPR/Cas9 expression clones.
• This method significantly accelerates the generation of reagents for genome editing applications.
• The system facilitates faster gene function validation and advances genetic research in plants.