Hydrazone chemistry-mediated CRISPR/Cas12a system for bacterial analysis

Area of Science:

• Molecular Biology
• Biotechnology
• Chemical Biology

Background:

• The Clustered Regularly Interspaced Palindromic Repeats (CRISPR)/CRISPR-associated protein 12a (Cas12a) system is a powerful tool for gene editing and nucleic acid detection.
• Enhancing the speed, efficiency, and specificity of CRISPR/Cas12a systems remains an active area of research for broader applications.
• Distinguishing single-base mismatches is crucial for accurate molecular diagnostics.

Purpose of the Study:

• To develop and characterize a novel hydrazone chemistry-mediated CRISPR/Cas12a system.
• To leverage hydrazone chemistry to accelerate CRISPR/Cas12a activation and improve specificity.
• To demonstrate the system's utility in detecting bacterial pathogens.

Main Methods:

• Construction of a CRISPR/Cas12a system incorporating hydrazone chemistry.
• Utilizing the proximity effect induced by complementary base pairing to accelerate activation strand formation.
• Application of the system for the detection of Pseudomonas aeruginosa by targeting a specific fragment in 16S rDNA.

Main Results:

• The hydrazone chemistry successfully accelerated CRISPR/Cas12a system activation.
• The system demonstrated high specificity, effectively distinguishing single-base mismatches.
• The method achieved a wide linear range (3.8 × 10^2 to 3.8 × 10^6 CFU/ml) with a low detection limit of 24 CFU/ml for Pseudomonas aeruginosa.

Conclusions:

• The integration of hydrazone chemistry provides a rapid and efficient activation mechanism for the CRISPR/Cas12a system.
• Hydrazone chemistry enhances the specificity of the CRISPR/Cas12a system, enabling precise detection of target nucleic acids.
• This novel approach broadens the potential applications of CRISPR/Cas12a technology in molecular diagnostics and pathogen detection.