CRISPR-Edited GLR3.3 Channels for Sustained Insect Defense Signaling

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Solution Overview

Problem

Plants lack effective mechanisms to sustain systemic defense responses against herbivores due to rapid desensitization of glutamate receptor-like (GLR) channels, which attenuates wound-induced signaling and calcium waves, leading to compromised defense against insect attacks.

Innovation Solution

Engineering GLR3.3 alleles with impaired Ca2+/calmodulin-mediated desensitization through CRISPR-based editing to prolong systemic electrical signaling and calcium waves, enhancing plant defense.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If GLR channels are activated by wound-induced glutamate to trigger systemic defense signaling, then plant defense response is initiated, but rapid desensitization of GLR channels attenuates the signaling duration and compromises sustained defense

Engineering Contradiction:

Improvesignaling durationVSAvoiddefense response reliability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent modifies the desensitization kinetics parameter of GLR channels by introducing engineered alleles with impaired Ca2+/calmodulin-mediated desensitization. This changes the temporal profile of channel activity from rapid transient to prolonged sustained signaling, resolving the contradiction between initial response speed and sustained defense reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent disrupts the negative feedback loop formed by Ca2+/calmodulin-mediated desensitization of GLR channels. By impairing this feedback mechanism through engineered mutations, the system maintains prolonged channel activity and sustained signaling without the rapid attenuation that would compromise defense reliability

Inventive Principle:

Principle #23Feedback

2Stability of the object's composition

If Ca2+/calmodulin-mediated desensitization of GLR channels is functional, then channel activity is regulated and prevented from overstimulation, but this desensitization attenuates wound-induced signaling and reduces systemic defense

Engineering Contradiction:

Improvechannel activity stabilityVSAvoidattenuation of wound signaling

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of rapid desensitization (which normally attenuates signaling) into a beneficial sustained signaling state by engineering GLR alleles with impaired desensitization. The engineered channels maintain stable activity throughout the wound response period, transforming the temporary regulatory mechanism into a prolonged protective function

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Duration of action of moving object

If engineered GLR3.3 alleles with impaired desensitization are introduced, then systemic electrical signaling and calcium waves are prolonged, but this may potentially cause continuous channel activation and energy consumption

Engineering Contradiction:

Improvesystemic signaling durationVSAvoidenergy consumption

Core Design Contradiction:

Duration of action of moving objectVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by impairing rather than completely eliminating desensitization. The engineered GLR3.3 alleles maintain reduced but non-zero Ca2+/calmodulin-mediated regulation, providing sufficient energy efficiency while achieving prolonged signaling. This partial impairment resolves the contradiction between extended signaling duration and energy consumption

Inventive Principle:

Principle #16Partial or excessive action

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 engineered GLR3.3 channels result in prolonged wound-induced signaling and increased jasmonic acid accumulation, providing enhanced resistance to herbivores without affecting plant growth or productivity.

Implementation Method 1

calmodulin (CaM)-mediated desensitization of GLR channels in a Ca2+ dependent manner

Methodology Applied

Scientific EffectCalmodulin-mediated desensitization:

Implementation Method 2

Ca2+/calmodulin-mediated desensitization

Methodology Applied

Scientific EffectCalcium-dependent binding:

Implementation Method 3

The systemic electrical signals and calcium waves rapidly dissipate to restore the resting state

Methodology Applied

Scientific EffectElectrical signaling:

Implementation Method 4

triggering membrane depolarization and cytosolic Ca2+ influx throughout the plants

Methodology Applied

Scientific EffectCalcium wave propagation:

Implementation Method 5

activation of Ca2+-permeable GLR channels by wound-released glutamate (Glu)

Methodology Applied

Scientific EffectGlutamate binding:

Implementation Method 6

made mutations in this domain using CRISPR procedure, defining engineered mutants

Methodology Applied

Scientific EffectCRISPR gene editing:

Data Source

PatentUS20250270584A1Gene editing to provide insect resistance in crops

Publication Date: 2025.08.28 RGT UNIV OF CALIFORNIA

AI summary

Methods and compositions to produce insect resistance in plants deploy an engineered glutamate receptor-like protein (GLR3.3) that functions in transmitting wound-induced signals from local to systemic plant organs to trigger synthesis of jasmonic acid, a defense hormone.