Genome Editing in Potato with CRISPR/Cas9

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Genetics

Background:

• Cultivated potato (Solanum tuberosum) is a heterozygous tetraploid crop propagated clonally, leading to identical genotypes.
• Lack of sexual reproduction limits traditional breeding approaches for trait improvement.
• Genetic engineering presents an efficient strategy for introducing desirable traits in potato.

Purpose of the Study:

• To describe procedures for designing and cloning single guide RNA (sgRNA) vectors for CRISPR/Cas9 gene editing in potato.
• To outline methods for generating gene knockouts via non-homologous end-joining (NHEJ) and gene targeting via homologous recombination (HR).
• To detail the use of geminivirus replicons (GVRs) and Agrobacterium-mediated transformation for efficient gene editing in potato.

Main Methods:

• Design and cloning of gene-specific sgRNA vectors for Streptococcus pyogenes Cas9 (SpCas9).
• Generation of double-stranded breaks (DSBs) at target loci, repaired by NHEJ or HR pathways.
• Agrobacterium-mediated transformation protocols and tissue culture for generating gene-edited potato events.

Main Results:

• Successful implementation of CRISPR/Cas9 technology for targeted mutagenesis (knockout mutations) in potato.
• Demonstration of gene targeting for precise editing of endogenous genes using homologous recombination.
• Facilitation of gene editing by HR through the use of geminivirus replicons (GVRs).

Conclusions:

• CRISPR/Cas9 is a powerful and versatile genome-editing tool for potato crop improvement.
• Established protocols enable efficient generation of gene knockouts and targeted gene edits in potato.
• The described methods facilitate molecular characterization of gene-edited potato events for trait enhancement.