CRISPR-induced large intrachromosomal inversions in vegetable crops

Overview

Structural variation in plant genomes, including chromosomal inversions, plays a significant role in crop genetics. Inversions can lock desirable traits together through suppressed recombination, but they can also trap unwanted traits in linkage drag. This offering applies CRISPR/Cas9 and Cas12a nucleases to deliberately generate large intrachromosomal inversions in vegetable crops, enabling breeders and researchers to bring beneficial alleles into close proximity in a controlled manner. The approach addresses a key challenge in modern plant breeding by providing a targeted method to restructure chromosomes rather than relying on naturally occurring variation.

The core value proposition is the ability to engineer chromosomal architecture for crop improvement, particularly useful when conventional breeding cannot separate tightly linked traits or when stacking multiple beneficial alleles is desired. This capability is relevant for seed companies, breeding programs, and academic research groups working on vegetable crop genetics.

Technical specifications

Key capabilities:

• Targeted mutagenesis using CRISPR/Cas9 and Cas12a across multiple species including tomato, cucumber, Arabidopsis, Brassica, and chicory
• Generation of targeted fragment deletions that may result in chromosomal inversions upon reinsertion
• Flexible delivery methods including Agrobacterium-mediated T-DNA constructs and protoplast transfection (plasmid or ribonucleoprotein)
• Protoplast-based approaches that avoid transgenesis, though regeneration capacity varies by species
• Agrobacterium approaches that allow transgene segregation in subsequent generations for homozygous, self-fertilizing parents
• gRNA design and efficacy testing in protoplasts, followed by PCR-based junction analysis and amplicon sequencing to confirm inversion events

Validation workflow:

• Identification of target alleles and minimal DNA extent for inversion
• Selection and testing of gRNA pairs at inversion boundaries
• Assessment of inversion efficacy through junction amplification and sequencing
• Optional off-target mutation analysis when risk warrants evaluation
• Final selection of delivery, screening, and regeneration strategy based on crop biology and available protocols

Technology readiness level

The underlying CRISPR delivery and targeted mutagenesis capabilities are established in the host laboratory across multiple vegetable crop species. The inversion-specific application is at an advanced research stage, with demonstrated experience in targeted fragment deletions in tomato. The approach requires species-specific optimization, particularly for protoplast regeneration protocols and delivery method selection. Validation efforts focus on improving inversion frequency and developing reliable screening methods. The technology is suitable for collaborative pilot projects with breeding partners seeking to explore controlled chromosomal restructuring as a trait improvement strategy.