MON95275 Corn Event with Multi-Mode Rootworm Resistance
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Solution Overview
Problem
Existing transgenic corn events have shown resistance to insect pests, particularly Coleopteran species like corn rootworm, are facing challenges due to the development of resistance in these insects to previously deployed toxins, necessitating novel transgenic events with different modes of action.
Innovation Solution
The development of transgenic corn event MON95275, which expresses Cry75Aa1 and Vip4Da2 proteins and a dsRNA targeting DvSnf7, provides resistance to Coleopteran pests such as Western and Northern Corn Rootworm through a unique DNA construct optimized for expression and marker-free production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing transgenic corn events expressing similar toxins are deployed, then initial insect resistance is achieved, but resistance develops in target insect pests over time
Solution Approach 1:
The patent combines three different insecticidal mechanisms into a single transgenic event: Cry75Aa1 protein (binuclear pore-forming toxin), Vip4Da2 protein (vesicotoxin), and dsRNA targeting DvSnf7 (RNA interference). This multi-toxin approach creates synergistic effects that delay resistance development while maintaining broad Coleopteran pest control
Solution Approach 2:
The invention uses a composite genetic construct containing multiple toxin genes with different modes of action. The DNA construct integrates Cry75Aa1, Vip4Da2, and DvSnf7-targeting dsRNA sequences, creating a composite biological material that provides enhanced and durable insect resistance compared to single-toxin events
2Reliability
If multiple toxins are expressed in a single transgenic event, then insect resistance effectiveness is improved, but DNA construct complexity increases
Solution Approach 1:
The complex DNA construct is organized into distinct functional segments: promoter regions, toxin coding sequences (Cry75Aa1, Vip4Da2), dsRNA coding sequence targeting DvSnf7, and termination sequences. This segmentation allows for systematic integration and expression of multiple toxins while maintaining manageable construct architecture
Solution Approach 2:
The transgenic event serves multiple functions simultaneously: it expresses two different protein toxins (Cry75Aa1 and Vip4Da2) with different modes of action, produces dsRNA for RNA interference against DvSnf7, and provides durable resistance across multiple Coleopteran pest species including Western and Northern corn rootworm
Data Source
AI summary
The invention provides a transgenic corn event MON95275, plants, plant cells, seeds, plant parts (including pollen, seed, and cells, and tissues corresponding to tassel, root, stalk, stem, leaf, cobb, and the like), progeny plants, commodity products comprising detectable amounts of corn event MON95275 DNA. The invention also provides polynucleotides specific for corn event MON95275 and methods for using and detecting corn event MON95275 DNA as well as plants, plant cells, seeds, plant parts, progeny plants, and commodity products comprising corn event MON95275. The invention also provides methods related to making and using corn event MON95275.