Noctuid dsx Splice Cassette for Female-Specific Population Suppression
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Solution Overview
Problem
Noctuidae insects, such as Spodoptera frugiperda, have developed resistance to pesticides and Bt crops, necessitating a new approach to suppress their populations that reduces reliance on current methods and mitigates resistance.
Innovation Solution
A splicing cassette and female-specific gene expression system are developed to direct sex-specific splicing of a heterologous polynucleotide in Noctuidae, ensuring only female insects express a functional protein with a lethal or sterilizing effect, leading to population suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pesticides are used to control Noctuidae populations, then crop damage is reduced, but insect resistance to pesticides develops
Solution Approach 1:
The invention changes the mode of action parameter from chemical pesticides to a biological self-limiting gene system. The splicing cassette modifies the genetic parameters of the insect population, creating a fundamental shift in control mechanism that bypasses existing chemical resistance pathways.
Solution Approach 2:
The invention replaces the mechanical/chemical pesticide application system with a biological genetic system. The self-limiting gene acts as a biological agent that substitutes for chemical pesticides, utilizing natural genetic mechanisms rather than external chemical applications.
2Object-affected harmful factors
If Bt crops are used to control Noctuidae, then crop damage is reduced, but insects develop resistance to Bt proteins
Solution Approach 1:
The invention changes the genetic parameter control from plant-expressed Bt proteins to a self-limiting gene system in the insect. This fundamental parameter change shifts the locus of action from the crop plant to the insect itself, creating a new mode of control that does not rely on Bt protein mechanisms.
Solution Approach 2:
The invention substitutes the Bt crop plant defense system with a direct insect genetic control system. Rather than relying on plant-produced proteins, the control mechanism is embedded within the insect's own genetics through the self-limiting splicing cassette.
3Object-affected harmful factors
If sex-specific gene expression is implemented, then only female insects are affected, but mass rearing and sex separation becomes more complex
Solution Approach 1:
The splicing cassette utilizes the insect's own sex-determination mechanisms to automatically differentiate between males and females. The system serves itself by leveraging existing biological pathways (TRA/TRA2 complex recognition) rather than requiring external sex separation infrastructure.
Solution Approach 2:
The invention changes the splicing parameter response based on sex-specific transcription factors. The same splicing cassette produces different outcomes in males versus females by exploiting natural differences in gene regulation pathways between the sexes.
4Quantity of substance
If self-limiting genes are released into wild populations, then population suppression occurs, but resistance to the self-limiting mechanism may develop
Solution Approach 1:
The invention changes the genetic parameter by introducing a repressible gene system that can be controlled externally. This allows dynamic adjustment of the self-limiting mechanism's expression levels, creating a flexible control system that can adapt to prevent resistance development.
Solution Approach 2:
The splicing cassette incorporates feedback control through its repressible nature. The system can sense population levels and adjust gene expression accordingly, creating a self-regulating mechanism that responds to population dynamics and reduces selective pressure for resistance.
Data Source
AI summary
The invention provides a Noctuid dsx splice cassette for expression of a gene of interest on a sex-specific basis, gene expression systems for imparting a self-limiting trait to transformed Noctuidae, as well as transgenic Noctuidae and methods of suppressing populations of Noctuidae and reducing, inhibiting or eliminating crop damage caused by the Noctuid insects.