RNAi Resistant Insect Pest Colony Production Method
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Solution Overview
Problem
The development of resistance by insect pest species to RNAi-based control methods poses a threat to the effectiveness of RNAi-expressing transgenic crops, necessitating a method to produce and study RNAi-resistant insect pest colonies to understand resistance mechanisms and frequencies.
Innovation Solution
A method involving the selection and breeding of insect pest species from agricultural fields with and without RNAi-expressing plants to produce colonies resistant to dsRNA-mediated gene suppression, allowing for the assessment of resistance inheritance and allele frequency, and the identification of resistance mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RNAi-based control methods are used to manage insect pest species, then crop yield protection and pest control effectiveness are improved, but insect pest species develop resistance to RNAi, reducing the long-term effectiveness of the control method
Solution Approach 1:
The patent applies preliminary action by establishing monitoring systems and resistance management protocols before resistance becomes widespread. Field monitoring programs detect resistance alleles at low frequencies, allowing intervention before RNAi effectiveness is significantly compromised. This proactive approach extends the operational life of RNAi-based control methods.
Solution Approach 2:
The patent employs parameter changes by modifying RNAi delivery parameters, such as using different dsRNA concentrations, delivery methods (spray vs. transgenic), or target gene selections, to overcome developing resistance. By adjusting these parameters, the system maintains effectiveness even as pest populations adapt.
2Loss of information
If field-derived insect pest colonies are used to study resistance mechanisms, then understanding of resistance inheritance and allele frequency is improved, but the complexity of breeding and selecting resistant colonies increases
Solution Approach 1:
The patent applies segmentation by dividing the resistance study into distinct phases: field collection of pest specimens, laboratory rearing and adaptation, genetic analysis, and mechanism characterization. This segmented approach allows each stage to be optimized independently, reducing overall complexity while maintaining comprehensive data collection.
Solution Approach 2:
The patent uses intermediary tools such as molecular markers and genetic screening assays that facilitate the detection and tracking of resistance alleles without requiring complex breeding schemes. These intermediaries simplify the process of identifying and characterizing resistance mechanisms in field-derived colonies.
3Reliability
If resistant insect pest colonies are developed through selective breeding, then the ability to study resistance inheritance and mechanisms is improved, but the time and resources required for colony development increase
Solution Approach 1:
The patent applies preliminary action by collecting and adapting field-derived pest colonies to laboratory conditions before initiating resistance selection. This pre-adaptation phase ensures that colonies are healthy and genetically diverse, providing a stronger base for subsequent selection and reducing the time required to develop resistant lines.
Solution Approach 2:
The patent uses molecular copying techniques such as PCR amplification and DNA sequencing to rapidly analyze resistance alleles and inheritance patterns, replacing time-consuming phenotypic screening with faster genotypic analysis. This accelerates the characterization of resistance mechanisms without requiring extensive breeding cycles.
Data Source
AI summary
The present invention is directed to a method for producing an RNAi resistant insect pest species colony from an insect pest species isolated from an agricultural field. The invention is also directed to methods for determining the inheritance of resistance to the RNAi and determining the allele frequency of resistance in an agricultural field.