Inducible Quorum Sensing Circuits for Tunable Microbial Dynamics

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Solution Overview

Problem

Existing technologies lack effective tools for spatially and temporally controlling quorum sensing in bacterial populations, limiting the functionality of synthetic circuits for population and community-level dynamics.

Innovation Solution

An inducible quorum sensing system (iQS) using a plant-derived inducer, p-coumaric acid, to modulate quorum sensing in bacterial strains, enabling precise control over gene expression and cargo release through a synchronized lysis circuit (iSLC), allowing for spatial and temporal modulation of population dynamics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional quorum sensing systems are used, then bacterial populations can communicate and coordinate behavior, but precise spatial and temporal control over gene expression and cargo release cannot be achieved

Engineering Contradiction:

Improvecontrol precisionVSAvoidfunctionality expansion

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent introduces an exogenous inducer molecule (p-coumaric acid or its derivatives) as an intermediary that triggers the quorum sensing system. This mediator enables external control over the quorum sensing pathway, allowing precise spatial and temporal regulation of gene expression and cargo release without modifying the core bacterial communication mechanisms. The inducer binds to the quorum sensing receptor, initiating a controlled response that can be activated at specific locations and times.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs parameter changes by varying the concentration and timing of inducer molecule addition to control quorum sensing activation. By adjusting inducer concentration, timing of addition, and environmental conditions, the system achieves precise control over when and where quorum sensing is triggered, enabling dynamic regulation of population-level behaviors and cargo release patterns.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If quorum sensing is activated continuously, then population-level coordination is maintained, but the ability to switch between different functional states (quiescence, activation, constitutive expression) is lost

Engineering Contradiction:

Improvecircuit state stabilityVSAvoidstate switching capability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent creates a dynamic quorum sensing system where the circuit can transition between multiple stable states (quiescence, quorum-dependent activation, and constitutive expression) based on inducer presence and population density. The system incorporates feedback mechanisms and tunable parameters that allow reversible switching between states, enabling the bacterial population to adapt its behavior dynamically in response to environmental cues and control signals.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If synchronized lysis circuit is implemented, then temporal control over cargo release is achieved, but system complexity increases

Engineering Contradiction:

Improvecargo release timing precisionVSAvoidcircuit complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent segments the quorum sensing system into distinct functional modules: an inducer response module, a quorum sensing signaling module, a cargo release module, and a lysis control module. Each module performs a specific function and can be independently optimized or adjusted. This modular segmentation enables precise temporal control of cargo release through the synchronized lysis circuit while managing complexity through functional decomposition and standardized interface elements.

Inventive Principle:

Principle #1Segmentation

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 iQS system provides precise control over population-level gene expression and cargo release, expanding the functionality of quorum sensing circuits, with potential therapeutic applications by enabling timed strain elimination and non-toxic population death.

Implementation Method 1

converting the inducer molecule into a quorum sensing molecule

Methodology Applied

Scientific EffectEnzymatic catalysis: Enzyme

Data Source

PatentUS12594307B2Compositions and methods of using inducible signaling for tunable dynamics in microbial communities

Publication Date: 2026.04.07 RGT UNIV OF CALIFORNIA

AI summary

Provided herein are compositions and methods for modulating induction of quorum sensing in bacterial cells. For example, provided herein is a method of inducing method of inducing quorum sensing, where the method includes: culturing a bacterial strain, wherein the bacterial strain comprises a first nucleic acid sequence encoding a first activator polypeptide, wherein expression of the first activator polypeptide produces a quorum sensing molecule precursor; a second nucleic acid sequence encoding a second activator polypeptide, wherein expression of the second activator polypeptide produces a quorum sensing; a third nucleic acid sequence encoding a third activator polypeptide that is capable of activating the quorum sensing system; a fourth nucleic acid sequence encoding a gene of interest, and contacting the bacterial strain with an inducer molecule; and converting the inducer molecule into a quorum sensing molecule, thereby allowing induction of quorum sensing.