Universal and Programmable Rolling Circle Amplification-CRISPR/Cas12a-Mediated Immobilization-Free Electrochemical...

Area of Science:

• Biomedical Engineering
• Molecular Biology
• Analytical Chemistry

Background:

• Developing sensitive and specific biosensing platforms for disease monitoring is crucial but challenging.
• Existing methods often lack programmability and universal applicability.
• CRISPR/Cas systems offer precise molecular recognition capabilities.

Purpose of the Study:

• To develop an immobilization-free electrochemical biosensing platform using the CRISPR/Cas12a system.
• To achieve sensitive and specific detection of nucleic acids and small molecules.
• To demonstrate the programmability and modularity of the developed system for clinical diagnostics.

Main Methods:

• Integration of CRISPR/Cas12a with a modular rolling circle amplification (RCA) strategy.
• Utilizing RCA to generate a universal trigger DNA strand for CRISPR/Cas12a activation.
• Employing reduced graphene oxide-modified electrodes for electrochemical signal detection.

Main Results:

• Achieved highly sensitive and specific detection of microRNAs, Parvovirus B19 DNA, and adenosine-5'-triphosphate.
• Demonstrated ultra-low limits of detection (aM to pM range).
• Successfully constructed DNA logic circuits (YES, NOT, OR, AND) showcasing system programmability.

Conclusions:

• The RCA-CRISPR/Cas12a system provides a versatile and programmable platform for immobilization-free electrochemical biosensing.
• This approach broadens the application of CRISPR/Cas12a in biosensing.
• Offers a robust tool for developing advanced clinical diagnostic strategies.