Insecticidal Toxin Receptor Screening for Bt Resistance Management
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Solution Overview
Problem
The development of resistance to Bacillus thuringiensis (Bt) toxins by insect pests poses a significant challenge in effective pest control, particularly for Lepidopteran insects like the European corn borer, leading to substantial crop damage and increased control expenses.
Innovation Solution
Isolation and characterization of polynucleotides encoding novel insecticidal toxin receptors from Lepidopteran insects, such as Helicoverpa zea and Ostrinia nubilalis, and their use in creating genetically edited insect cells and colonies with altered susceptibility to Bt toxins, along with methods for screening and designing novel insecticides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Bt toxins are used for pest control, then crop damage is reduced, but insect resistance develops
Solution Approach 1:
The patent segments the toxin-receptor interaction system by isolating and characterizing specific receptor polypeptides (such as ABCA3, ABCA4, and other ATP-binding cassette family members) from different insect species. This segmentation allows for targeted study of resistance mechanisms at the molecular level, enabling identification of specific resistance mutations and development of toxins that bypass resistant receptors.
Solution Approach 2:
The patent uses receptor polypeptides as intermediaries to study toxin-insect interactions. By expressing these receptors in heterologous systems (such as insect cell lines or mammalian cells), the patent creates an intermediary model that facilitates investigation of toxin binding, internalization, and cellular effects without requiring whole-insect studies, thereby accelerating resistance management strategies.
2Reliability
If resistance monitoring is implemented, then toxin resistance management is improved, but screening complexity increases
Solution Approach 1:
The patent creates copies of insect receptor polypeptides by expressing them in heterologous host cells (such as Sf9 insect cells or mammalian cell lines). These recombinant receptor copies can be used for high-throughput screening of resistance mutations and toxin variants, simplifying the monitoring process compared to direct field sampling and whole-insect analysis.
Solution Approach 2:
The patent employs parameter changes in the form of receptor expression levels, binding affinities, and cellular internalization rates as measurable indicators of resistance. By quantifying these parameters in receptor-expressing cell lines, the patent enables objective monitoring of resistance development and facilitates comparison across different insect populations and toxin variants.
Data Source
AI summary
The disclosure relates to insecticidal toxin resistance management and screening of novel insecticidal toxins. One embodiment relates to the isolation, characterization, compositions, and methods of use relating to polynucleotides encoding novel insecticidal toxin receptors and the polypeptides encoded thereby. The polynucleotides and polypeptides are useful in identifying or designing novel insecticidal toxin receptor ligands including novel insecticidal toxins.