Multiplexed Cell-Free Biosensors With Positive Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cell-free protein synthesis (CFPS) systems face challenges in detecting trace contaminants due to low output signals and the scarcity of characterized strong promoters that can be regulated by allosteric transcription factors, limiting their sensitivity and versatility in detecting multiple target chemicals simultaneously.
Innovation Solution
A platform utilizing CFPS for in vitro sensing of metabolites with amplified output signals through positive feedback from autocatalytic transcription and translation, employing orthogonal polymerases in parallel to enhance sensitivity and enable simultaneous detection of multiple chemicals in a single reaction vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell-free systems are used for detecting trace contaminants, then the detection capability is improved, but the output signal is undesirably low
Solution Approach 1:
The patent implements positive feedback through autocatalytic transcription and translation. The detected target molecule activates transcription of an intermediate RNA polymerase, which then amplifies the output signal by promoting further transcription of reporter molecules. This feedback loop increases the output signal strength while maintaining detection capability for trace contaminants.
Solution Approach 2:
The patent introduces an intermediate RNA polymerase as a mediator between the detection event and the final signal output. This intermediate polymerase acts as an amplification step, converting the initial detection event into a stronger output signal that can be readily detected, thereby resolving the contradiction between detecting trace amounts and generating sufficient signal.
2Adaptability or versatility
If multiple target chemicals are detected simultaneously using orthogonal polymerases, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The patent employs orthogonal polymerases that can each recognize and transcribe from their specific promoter sequences. This allows a single CFPS system to simultaneously detect multiple different target chemicals, with each target having its own dedicated polymerase-promoter pair. The system achieves multi-functionality by integrating multiple detection pathways into one reaction vessel.
Solution Approach 2:
The patent segments the detection system into independent modular units, where each target chemical detection uses a specific orthogonal polymerase and its corresponding promoter-reporter construct. This segmentation allows for flexible combination of multiple detection pathways without interference, enabling multiplexed detection while maintaining manageable system complexity through modular design.
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 solution significantly enhances the sensitivity and speed of detecting target molecules, allowing for rapid and multiplexed detection of contaminants and metabolites, with potential applications in monitoring global water quality and human health markers.
Implementation Method 1
autocatalytic transcription and translation decreases the time required for a generating a detectable signal
Implementation Method 2
autocatalytic transcription and translation decreases the time required for a generating a detectable signal
Implementation Method 3
one or more transcription templates that encode and conditionally express one or more exogenous RNA polymerases
Data Source
AI summary
Disclosed are methods for detecting a target molecule in a test sample using a cell-free protein synthesis (CFPS) reaction. The methods may be utilized for detecting target molecules which may include small molecules and/or metabolites of small molecules. The methods employ one or more transcription templates that encode and conditionally express one or more exogenous RNA polymerases in the presence of the target molecule. The expressed RNA polymerases in turn induce expression of one or more reporter molecules from transcription templates comprising promoters for the RNA polymerases, thereby amplifying an output signal that is generated in the presence of a detected target molecule.