Txp40 Insecticidal Protein for Fall Armyworm Control
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Solution Overview
Problem
Current methods for controlling Spodoptera frugiperda (fall armyworm) pests, such as synthetic insecticides and transgenic corn expressing Bt-derived proteins, face challenges due to resistance development and environmental concerns, necessitating new and environmentally acceptable control agents with different modes of action.
Innovation Solution
The use of Txp40 insecticidal proteins and their variants, which exhibit oral toxicity to Spodoptera frugiperda, are introduced through recombinant polynucleotides, expression cassettes, and transgenic plants to control FAW populations, offering a novel approach to mitigate resistance and minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic insecticides are used to control FAW, then initial control effectiveness is achieved, but resistance develops rapidly reducing long-term reliability
Solution Approach 1:
The patent changes the chemical structure parameter of the insecticidal agent by using Txp40 protein from Xenorhabdus nematophila, which has a different mode of action compared to conventional synthetic insecticides and Bt proteins. This structural and mechanistic change allows effective control of FAW populations that have developed resistance to existing insecticides, thereby maintaining reliability while extending the duration of effective control.
2Reliability
If Bt-derived proteins (Cry and Vip3) are expressed in transgenic corn, then FAW control is improved, but resistance evolution is accelerated
Solution Approach 1:
The patent introduces Txp40 protein as an intermediary insecticidal agent that bridges the gap between FAW control needs and resistance management. This protein from a different bacterial genus (Xenorhabdus vs. Bacillus) provides an alternative mechanism of action that effectively controls FAW while reducing selection pressure for resistance, thus maintaining both control reliability and pest population adaptability.
3Duration of action of stationary object
If continuous expression of Bt proteins is used, then sustained FAW protection is achieved, but environmental burden increases
Solution Approach 1:
The patent changes the biological parameter of the insecticidal protein by using Txp40 from Xenorhabdus nematophila instead of Bt proteins. This alternative protein maintains sustained protection capability while potentially reducing environmental burden due to its different biochemical properties and mode of action, addressing both the duration of protection and environmental impact concerns.
Data Source
AI summary
Methods for controlling plant pests are disclosed. In particular, insecticidal proteins having toxicity to Spodoptera insect pests are provided. Polynucleotides comprising codons optimized for expression in plants encoding the insecticidal proteins are also provided. Methods of making the insecticidal proteins and methods of using the insecticidal proteins and polynucleotides encoding the insecticidal proteins of the invention, for example in transgenic plants to confer protection from insect damage, are also disclosed.