SpCas9/gRNA RNP Gene Editing Technology for Vegetable Crop Mutagenesis
A DNA-free CRISPR gene editing platform using SpCas9/gRNA ribonucleoprotein complexes to generate targeted mutants in Solanaceae and Cucurbitaceae vegetable crops. The technology avoids Agrobacterium transformation, eliminating off-target effects since the RNP complex degrades after editing. Proven across sorghum, cotton, Arabidopsis, and Chlamydomonas.
Overview
This offering provides a DNA-free CRISPR gene editing service for vegetable crop development, targeting members of the Solanaceae (such as tomato, pepper, eggplant) and Cucurbitaceae (such as cucumber, melon, squash, watermelon) families. The approach uses SpCas9/gRNA ribonucleoprotein (RNP) complexes delivered directly to germ cells, bypassing Agrobacterium-mediated transformation entirely. Because the RNP complex is degraded after performing its editing function, the resulting plants contain no foreign DNA, which significantly reduces off-target effects and regulatory hurdles associated with transgenic approaches.
The technology is well suited for seed companies, breeding programs, and agricultural biotechnology firms seeking to introduce precise genetic traits into vegetable crops without the regulatory and consumer acceptance challenges linked to transgenic methods.
Technical specifications
Key features:
- DNA-free editing: SpCas9 protein and gRNA are delivered as a pre-assembled RNP complex, avoiding integration of foreign DNA into the plant genome
- Reduced off-target effects: The RNP complex is transient and degrades after editing, limiting prolonged nuclease activity
- Germ cell transformation: Editing is performed directly on germ cells, enabling heritable mutations to be recovered in subsequent generations
- Customizable targets: gRNAs are designed against company-specified target genes
- Comprehensive validation: Edited lines are confirmed through PCR, fragment analysis, and DNA sequencing across T1 and T2 generations, with homozygous mutants identified and phenotyped
- Seed delivery: Confirmed mutant lines are scaled up to produce seed quantities for return to the partner
Workflow stages:
- Greenhouse cultivation to determine optimal germ cell developmental stages
- gRNA design and RNP complex assembly
- In planta incubation of germ cells with the RNP complex
- T1 screening and genotyping
- T2 identification of homozygous mutants
- Phenotypic evaluation and seed scale-up
Technology readiness level
The technology has been validated in multiple plant systems, including Chlamydomonas (24 mutants), sorghum (4 mutants), cotton (6 mutants), and Arabidopsis (1 mutant), demonstrating reproducibility across diverse species. Extension to Solanaceae and Cucurbitaceae vegetable crops represents the next application phase. The underlying RNP delivery method is established, and the primary remaining work involves optimizing germ cell transformation conditions specific to vegetable species. The approach is positioned at a stage where collaborative pilot projects with industry partners can accelerate species-specific optimization and trait development.
About Texas Tech University
Texas Tech University is a large, comprehensive public research university in Lubbock and an anchor of the Texas Tech University System, coupling academic breadth with applied, collaborative research. Industry partners engage through a research park and incubator, co-located labs, shared core facilities, and West Texas field sites for pilot-scale and real-world testing. Proximity to the Permian Basin and regional manufacturing, plus collaboration with the system’s health sciences center, creates clear pathways for product development, clinical translation, and talent pipelines. Research is supported by competitive federal funding from agencies such as NSF, DOE, USDA, NIH, DoD, and NASA, and a dedicated technology transfer office streamlines IP, licensing, startup formation, and corporate contracting.
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