Bacillus thuringiensis Cry Toxin Genes for Broad-Spectrum Lepidopteran Control
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Solution Overview
Problem
Current methods for controlling insect pests in agriculture rely heavily on chemical pesticides, which pose environmental hazards and have limited effectiveness against a broad range of insect pests, particularly those from the order Lepidoptera, necessitating the development of alternative, environmentally friendly solutions with broader insecticidal activity.
Innovation Solution
The use of nucleic acids encoding novel insecticidal peptides from Bacillus thuringiensis genes to produce transformed microorganisms and plants that express pesticidal polypeptides, providing enhanced insect resistance and broader insecticidal activity against pests like the European corn borer and fall armyworm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broad-spectrum chemical insecticides are used to control insect pests, then insect pest populations are impacted, but environmental hazards increase and target specificity decreases
Solution Approach 1:
The patent extracts and utilizes specific pesticidal polypeptides (Cry toxins) from Bacillus thuringiensis bacteria to create biopesticides that target specific insect pests without the environmental hazards of broad-spectrum chemical insecticides. The Cry toxin genes are isolated and expressed in bacterial systems to produce targeted pest control agents.
Solution Approach 2:
The patent employs Bacillus thuringiensis as an intermediary organism that naturally produces pesticidal polypeptides. These biopesticides serve as intermediaries between biological control agents and target pests, providing environmentally friendly pest control through species-specific toxicity mechanisms.
2Object-affected harmful factors
If Bacillus thuringiensis biopesticides are used to provide target specificity, then environmental hazards are reduced, but the range of insect pests affected remains limited
Solution Approach 1:
The patent achieves multi-functionality by combining multiple Cry toxin genes (Cry1A, Cry2A, Cry3A) into a single biopesticide composition or expression system. This enables a single biopesticide product to target multiple insect pest species across different orders (Lepidoptera, Diptera, Coleoptera) while maintaining environmental safety and target specificity.
Solution Approach 2:
The patent creates composite biopesticide formulations containing multiple pesticidal polypeptides with different spectral activities. By combining Cry1A (effective against Lepidoptera), Cry2A (effective against Diptera and Lepidoptera), and Cry3A (effective against Coleoptera), the composition achieves broad-spectrum coverage while maintaining the environmental benefits of biological control.
3Reliability
If genetically engineered crops producing pesticidal proteins are deployed, then insect resistance is enhanced for specific pests, but the range of economically important insect pests covered remains narrow
Solution Approach 1:
The patent enables genetically engineered crops to produce multiple pesticidal polypeptides simultaneously through the expression of composite Cry toxin gene stacks. This allows a single transgenic crop variety to provide resistance against multiple insect pest species, including Lepidoptera, Diptera, and Coleoptera, thereby expanding the versatility of genetic engineering-based pest resistance.
Data Source
AI summary
The invention provides nucleic acids, and variants and fragments thereof, obtained from strains of Bacillus thuringiensis encoding polypeptides having pesticidal activity against insect pests, including Lepidoptera. Particular embodiments of the invention provide isolated nucleic acids encoding pesticidal proteins, pesticidal compositions, DNA constructs, and transformed microorganisms and plants comprising a nucleic acid of the embodiments. These compositions find use in methods for controlling pests, especially plant pests.