CRISPR-Cas9 Protocol for Efficient Gene Knockout and Transgene-free Plant Generation

Area of Science:

• Plant Molecular Biology
• Genomics
• Biotechnology

Background:

• Gene editing technologies offer precise tools for plant gene manipulation.
• CRISPR-Cas9 is a versatile and widely adopted strategy for targeted gene editing.
• Tomato is a key model and crop plant for agricultural research.

Purpose of the Study:

• To provide a detailed protocol for CRISPR-Cas9 genome editing in tomato plants.
• To generate gene knockout lines in tomato for functional studies.
• To develop a method for obtaining transgene-free edited plants.

Main Methods:

• Utilizing the CRISPR-Cas9 system with two single-guide RNAs (sgRNAs).
• Designing sgRNAs within the first exon, downstream and near the start codon of the target gene.
• Implementing a protocol for generating and regenerating edited tomato plants.

Main Results:

• Successful generation of gene knockout tomato lines.
• Obtained edited plants are free of the CRISPR-Cas9 transgene cassette.
• The protocol requires 6-12 months to yield a transgene-free edited plant.

Conclusions:

• CRISPR-Cas9 is an effective tool for generating gene knockouts in tomato.
• The developed protocol enables the production of transgene-free edited tomato plants.
• This method facilitates functional genomics and crop improvement in tomato.