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A cascade amplification strategy for ultrasensitive Salmonella typhimurium detection based on DNA walker coupling
Haijiao Zhang1, Shuo Yao2, Ren Sheng3
1College of Life and Health Science, Northeastern University, Shenyang 110819, PR China.
Journal of Colloid and Interface Science
|June 19, 2022
Summary
A new DNA walker and CRISPR-Cas12a system offers ultra-sensitive detection of Salmonella typhimurium (S. typhimurium). This method significantly lowers the detection limit for faster foodborne illness prevention and diagnosis.
Area of Science:
- Biotechnology
- Molecular Biology
- Food Safety
Background:
- Salmonella typhimurium (S. typhimurium) infections are a major public health concern due to severe foodborne illnesses.
- Ultra-sensitive detection methods are crucial for timely prevention and diagnosis of S. typhimurium.
Purpose of the Study:
- To develop a novel, highly sensitive detection system for S. typhimurium.
- To improve upon existing detection limits for S. typhimurium.
Main Methods:
- Development of a detection system integrating DNA walker and CRISPR-Cas12a technologies.
- Utilizing Nt.AlwI nicking endonuclease triggered by S. typhimurium specific sequences.
- Employing Cas12a activation for strong fluorescence signal output via a cascade amplification strategy.
Main Results:
- Achieved excellent specificity in detecting S. typhimurium.
- Reduced the limit of detection (LOD) by 2,000-fold to 5 CFU/mL.
- Demonstrated a robust fluorescence signal output.
Conclusions:
- The combinatorial DNA walker and CRISPR-Cas12a approach enables ultra-sensitive S. typhimurium detection.
- This technology holds significant promise for reducing foodborne diseases.
- The innovative design shows potential for detecting other biomolecules, cells, and pathogens.
