RNA Silencing for Stinkbug Control via Gene Expression Reduction
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Solution Overview
Problem
Current methods for controlling stinkbugs in agriculture are inadequate, as transgenic controls have not been successful due to the insects' extraoral digestion behavior, which makes it difficult for proteins to survive and manifest activity, and there is a need for alternative methods to traditional insecticides.
Innovation Solution
The use of silencing elements, such as specific polynucleotides and their variants, that are ingested by stinkbugs, reducing the expression of target sequences and thereby controlling the pests, including N. viridula, Acrosternum hilare, Piezodorus guildini, and Halymorpha halys, by decreasing the level of target polynucleotides or polypeptides, thereby limiting damage to plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transgenic proteins are used to control stinkbugs, then insecticidal activity is provided, but the proteins cannot survive long enough to manifest activity due to extraoral digestion
Solution Approach 1:
The patent replaces protein-based insecticidal mechanisms with RNA-based gene silencing mechanisms. Instead of relying on proteins to survive digestion, the invention uses double-stranded RNA molecules that are ingested by stinkbugs and trigger RNA interference, silencing essential genes in the pest. This substitution of the active agent from protein to RNA resolves the contradiction by using a molecule that can withstand the digestive process and still achieve its insecticidal effect through genetic silencing.
2Reliability
If broad spectrum insecticides are used to control stinkbugs, then pest control is achieved, but environmental consequences are caused
Solution Approach 1:
The patent applies the principle of local quality by designing RNA molecules with specific sequence compositions that target stinkbug genes while minimizing impact on non-target organisms. The silencing elements are engineered with specific nucleotide sequences (e.g., GC content, length, secondary structure) that provide localized specificity to the pest control action, affecting only the intended target species rather than broad spectrum environmental impacts.
Solution Approach 2:
The invention uses RNA molecules as intermediaries between the plant and the pest's genetic system. Instead of direct chemical insecticides that affect multiple organisms, the RNA acts as a specific mediator that enters the pest through feeding and triggers gene silencing only in the target organism. This intermediary approach provides selective pest control while avoiding the environmental consequences of broad-spectrum chemicals.
3Adaptability or versatility
If transgenic control methods are developed for stinkbugs, then alternative to insecticides is provided, but no successful control has been described due to feeding behavior
Solution Approach 1:
The patent inverts the traditional approach by not trying to make proteins survive the pest's digestive system, but instead using the digestive system as a delivery mechanism for RNA molecules. Rather than protecting the active agent from digestion, the invention designs RNA that is stable enough to survive ingestion and then exploits the pest's feeding behavior to deliver the silencing element into the pest's body, where it achieves its effect through gene silencing rather than direct protein activity.
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 method effectively controls stinkbug populations by reducing the expression of target sequences, leading to decreased pest activity and damage to plants, with potential for broad-spectrum efficacy against Pentatomidae plant pests.
Implementation Method 1
RNAi may overcome that feeding behavior by relying on double stranded RNAs rather than proteins
Data Source
AI summary
Methods and compositions are provided which employ a silencing element that, when ingested by a pest, such as a Pentatomidae plant pest, decrease the expression of a target sequence in the pest. The present invention provides various target polynucleotides set forth in any one of SEQ ID NOS: 6-12, 18-40 or active variants and fragments thereof, wherein a decrease in expression of one or more the sequences in the target pest controls the pest (i.e., has insecticidal activity). Plants, plant part, bacteria and other host cells comprising the silencing elements or an active variant or fragment thereof of the invention are also provided.