Targeted Base Editing with CRISPR-Deaminase in Tomato.

Area of Science:

• Genetics
• Molecular Biology
• Plant Science

Background:

• CRISPR/Cas9 technology allows targeted gene editing.
• Cytidine deaminase fused with CRISPR/Cas9 enables base editing.
• Template-independent nucleotide substitutions are desirable for precision gene editing.

Purpose of the Study:

• To introduce methods for applying the plant-optimized Target-AID system in tomato.
• To demonstrate the efficacy of Target-AID for precise genomic nucleotide substitutions in plants.

Main Methods:

• Utilizing a complex of cytidine deaminase and deficient CRISPR/Cas9 guided by sgRNAs.
• Catalyzing the conversion of cytosine to uracil, creating U-G mismatches.
• Leveraging DNA replication and repair pathways for C-to-T or G-to-A substitutions.

Main Results:

• Target-AID achieves highly specific genomic nucleotide substitutions without template DNA.
• The system retains CRISPR/Cas9 benefits: robustness, high efficiency, and multiplexing.
• Successful targeted base editing demonstrated in tomato and rice using a plant-optimized system.

Conclusions:

• The Target-AID system provides a robust and efficient method for precise base editing in plants.
• This technology facilitates targeted C-to-T and G-to-A substitutions in tomato and rice genomes.
• The described methods enable the application of Target-AID in tomato for advanced plant genetic research.