Cas Enzyme-Modified Pdots Nanoprobe for Nucleic Acid Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrochemiluminescence detection methods face challenges in achieving high sensitivity, accuracy, and specificity without the need for nucleic acid pre-amplification, which can lead to false positives and increased complexity.
Innovation Solution
The integration of a Cas enzyme system with semiconducting polymer dots (Pdots) nanoprobe, utilizing a complex of Cas protein and crRNA to activate Cas enzyme activity and modify Pdots with an oligonucleotide chain containing a quencher molecule, allowing for controlled ECL signal switching and enhanced sensitivity through dual enzyme catalysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemiluminescence detection methods are used, then detection sensitivity can be improved, but the requirement for nucleic acid pre-amplification increases device complexity and reduces reliability
Solution Approach 1:
The patent combines the Cas enzyme recognition system with the electrochemiluminescence detection system into an integrated nanoprobe. The Cas enzyme-crRNA complex directly binds to target nucleic acids and triggers ECL signal changes without requiring separate pre-amplification steps, thereby simplifying the detection process while maintaining high sensitivity.
Solution Approach 2:
The nanoprobe system performs self-amplification through the catalytic activity of the Cas enzyme. When the Cas enzyme-crRNA complex binds to the target nucleic acid, it catalyzes the cleavage of the oligonucleotide chain, which automatically triggers the ECL signal switching without requiring external amplification reagents or complex pre-processing steps.
2Measurement precision
If nucleic acid pre-amplification is performed to enhance detection sensitivity, then measurement precision improves, but false positives increase and reliability decreases
Solution Approach 1:
The patent employs a hairpin-shaped oligonucleotide chain that is pre-configured in a closed structure with the quencher molecule positioned to suppress the ECL signal. Only when the Cas enzyme-crRNA complex specifically recognizes and binds to the target nucleic acid does the hairpin structure open, allowing the ECL signal to activate. This preliminary structural arrangement ensures that the signal is generated only upon specific target recognition, eliminating false positives.
Solution Approach 2:
The hairpin-shaped oligonucleotide chain acts as an intermediary between the Cas enzyme recognition system and the ECL signaling system. It translates the specific binding event of the Cas enzyme-crRNA complex with the target nucleic acid into a measurable ECL signal change, ensuring that signal generation is strictly coupled to specific target recognition and preventing non-specific signal activation.
3Adaptability or versatility
If conventional probes are used for target identification, then detection can be performed, but adaptability to different nucleic acid sequences is limited
Solution Approach 1:
The patent employs a universal Cas enzyme platform that can recognize and bind to any nucleic acid sequence through programmable crRNA guides. The core ECL nanoprobe structure remains constant, while only the crRNA sequence needs to be changed to target different nucleic acid sequences, providing universal adaptability across diverse targets without requiring redesign of the entire detection system.
Solution Approach 2:
The patent achieves adaptability to different nucleic acid sequences by changing the nucleotide sequence parameter of the crRNA guide, which directs the Cas enzyme to specific target sequences. This parameter change allows the same nanoprobe platform to be reconfigured for detecting different targets, providing versatility without increasing device complexity.
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
This approach enables high sensitivity, accuracy, and specificity in nucleic acid detection without pre-amplification, reducing false positives and simplifying the detection process, while allowing for flexible targeting of any nucleic acid sequence.
Implementation Method 1
utilizing a complex of Cas protein and crRNA to activate Cas enzyme activity
Implementation Method 2
modifying Pdots with an oligonucleotide chain containing a quencher molecule, allowing for controlled ECL signal switching
Implementation Method 3
Electrochemiluminescence (ECL) is an electrochemical energy relaxation process in which the excitation mode and signal detection are separated
Data Source
AI summary
A method for producing an electrochemiluminescence nanoprobe according to an embodiment includes: a Pdots nanoparticle synthesis step of synthesizing a Pdots nanoparticle by polymerizing a conjugated polymer and a copolymer molecule; and a Pdots nanoparticle modification step of modifying a resulting Pdots nanoparticle using an oligonucleotide chain modified with a quencher molecule.