Asymptomatic subgenomic viral vector platform for crop protection and gene silencing

Overview

This technology leverages asymptomatic subgenomic viral vectors to deliver targeted gene silencing in plants, providing a versatile crop protection platform. By enabling both the suppression of endogenous genes and the introduction of heterologous genes, the system allows farmers and growers to respond to environmental stresses and optimize crop productivity in real time. A key innovation is an integrated kill-switch silencing vector capable of shutting down viral vector activity, functioning as a general antiviral defense mechanism. The platform supports both bio-contained biotic delivery (via Agrobacterium) and non-biotic nanoparticle-based delivery, giving operators flexibility in how the technology is applied in laboratory, greenhouse, or field settings.

Technical specifications

Core mechanism:

• Uses deconstructed, bi-partite DNA plant viral vectors to deliver gene silencing payloads into plant hosts
• Incorporates an antisense siRNA-based kill-switch silencing vector that targets and suppresses the viral vector itself
• In preliminary validation, the kill-switch achieved 93.8% suppression of a nano-luciferase reporter gene carried by the viral vector at 9 days post-inoculation, relative to a non-treated control

Delivery options:

• Agrobacterium-mediated biotic delivery for bio-contained laboratory and greenhouse use
• Nanoparticle-based non-biotic delivery for potential field application and broader scalability

Broader program integration:

• Designed to support introduction of heterologous genes into planted crops
• Supports optimization of native gene expression through manipulation of plant stress regulatory networks, including transcription factors and RNAi pathways

Technology readiness level

The technology is at an early-to-mid stage of development. Preliminary validation has demonstrated proof-of-concept for the kill-switch silencing mechanism using a partial tandem repeat of the virus's A-component with nano-luciferase as a reporter. Future validation efforts will incorporate the B-component of the bi-partite virus to demonstrate attenuation of systemic viral spread within host plants, and will directly compare nanoparticle and Agrobacterium delivery methods to evaluate efficiency and feasibility for field application. The platform is positioned for further development and partnership as part of a larger gene expression and crop protection program.