Yeast Strain Producing Interfering RNA for Mosquito Control

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Solution Overview

Problem

Current methods for mosquito population control, particularly against disease vectors like mosquitoes, are inadequate due to increasing insecticide resistance and concerns over off-target effects of pesticides, necessitating the development of environmentally safe and effective alternatives.

Innovation Solution

Engineering prototrophic mutant yeast cells with stably integrated expression cassettes encoding interfering RNA molecules, flanked by inverted terminal repeats, to target and inhibit mosquito gene expression, using a transposase/transposon system for stable integration and enhanced production of insecticidal nucleic acids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional insecticides are used for mosquito control, then mosquito populations can be reduced, but insecticide resistance increases and off-target effects occur

Engineering Contradiction:

Improvemosquito population control effectivenessVSAvoidinsecticide resistance and off-target effects

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses yeast as an intermediary organism to deliver interfering RNA to mosquitoes. Instead of directly applying chemical insecticides, the yeast acts as a biological vector that mosquitoes consume naturally, thereby delivering the RNA payload through the mosquito's feeding behavior on fermenting fruit or sugar sources containing the yeast

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces mechanical/chemical insecticide application systems with a biological system based on RNA interference. The interfering RNA molecules target and silence specific mosquito genes, providing a selective, species-specific control mechanism that avoids the broad-spectrum toxicity and resistance issues associated with conventional chemical insecticides

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If expression cassettes are integrated into yeast genome for stable production of interfering RNA, then commercial feasibility improves, but integration stability and expression levels must be optimized

Engineering Contradiction:

Improvecommercial feasibility of yeast-based insecticideVSAvoidgenetic stability and expression consistency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent performs preliminary optimization of the expression cassette design before commercial deployment, including selecting appropriate promoters, optimizing gene sequences for yeast expression, and pre-testing integration stability. This preliminary work ensures that the yeast strain is ready for scaled fermentation and commercial application without requiring further optimization in the field

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent optimizes multiple parameters of the expression system, including promoter strength, copy number of the expression cassette, and yeast strain selection, to achieve high and stable production of interfering RNA. These parameter optimizations enable the system to maintain reliability during scaled fermentation while improving manufacturing efficiency

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The approach effectively controls mosquito populations by inhibiting key gene expressions, such as Shaker, leading to reduced fitness and survival, while being selective to mosquitoes and environmentally friendly, with potential for scaled fermentation and commercial application.

Implementation Method 1

using a transposase/transposon system for stable integration

Methodology Applied

Scientific EffectTransposition:

Implementation Method 2

RNA interference provides a more selective alternative to broad-spectrum insecticides, and the technology has been shown to undermine the growth, such as the fitness, and survival of targeted insect pests, such as mosquitoes

Methodology Applied

Scientific EffectRNA interference:

Data Source

PatentUS20250017220A1Yeast strain for mosquito management

Publication Date: 2025.01.16 THE TRUSTEES OF INDIANA UNIV

AI summary

Disclosed herein are methods for producing interfering RNA biopesticides, such as microbial host organisms engineered to produce interfering RNA molecules which inhibit the expression of a gene in a mosquito disease vectors by RNA interference. Also disclosed herein are polynucleotides, such as expression cassettes encoding such interfering RNA molecule and facilitating integration, such as stable integration into the host organism's genome. Further disclosed herein are compositions including the disclosed nucleotide sequences and host organisms, along with methods of using the same to control mosquito populations.