Efficient CRISPR/Cas9-based genome editing and its application to conditional genetic analysis in Marchantia...

Area of Science:

• Plant science
• Genetics
• Molecular biology

Background:

• Marchia polymorpha is a key model organism for studying basal land plants.
• Existing CRISPR/Cas9 genome editing methods in Marchia polymorpha lack the efficiency for comprehensive functional analysis.

Purpose of the Study:

• To develop and validate highly efficient CRISPR/Cas9 genome editing vectors for Marchia polymorpha.
• To enable efficient functional genomics studies in this model plant.

Main Methods:

• Codon optimization of Cas9 for Arabidopsis thaliana.
• Systematic assessment of guide RNA lengths for genome editing efficiency.
• Development of CRISPR/Cas9 vectors and floxed complementation constructs.

Main Results:

• Achieved over 70% genome editing efficiency at tested loci using codon-optimized Cas9.
• Identified that guide sequences of 17 nucleotides or shorter significantly reduce editing efficiency.
• Demonstrated conditional analysis of a nearly essential gene using the developed system.

Conclusions:

• The developed CRISPR/Cas9 vectors provide a simple, rapid, and highly efficient method for genome editing in Marchia polymorpha.
• This advancement facilitates robust functional analysis and genetic studies in basal land plants.