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Published on: July 5, 2024
Entropy-Driven Circuit Integrated with Ligases to Regulate DNA-AuNP Network Disintegration for Colorimetric Detection
Yunshan Zhang1,2,3, Tuo Huang1,4, Fang Yang1
1Key Laboratory of Soybean Molecular Design Breeding, National Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
We developed a novel gold nanoparticle-enhanced entropy-driven circuit (EDC) system for sensitive nucleic acid detection. This method improves signal amplification for accurate single nucleotide polymorphism (SNP) genotyping.
Area of Science:
- Biotechnology
- Molecular Biology
- Nanotechnology
Background:
- Entropy-driven circuit (EDC) dynamic DNA networks offer efficient nucleic acid detection.
- Conventional EDC reactions have limited signal amplification due to a weak driving force.
Purpose of the Study:
- To develop an enhanced EDC approach using gold nanoparticles (AuNPs) for improved colorimetric signal amplification.
- To integrate this system with ligase chain reaction (LCR) for precise single nucleotide polymorphism (SNP) genotyping.
Main Methods:
- A gold nanoparticle (AuNP) dispersion-enhanced EDC (Au-EDC) system was designed.
- The Au-EDC system was coupled with LCR for selective mutant target (MT) detection and SNP genotyping.
- The system leverages the entropy increase from AuNP aggregation to dispersed states to drive the EDC cycle.
Main Results:
- The LCR-Au-EDC system achieved sensitive detection of MT down to 320 fM.
- The system could differentiate pooled samples with mutation frequencies as low as 0.1%.
- Accurate SNP genotyping was demonstrated on soybean leaf genomic DNA.
Conclusions:
- The developed Au-EDC system provides a novel colorimetric signal amplification and output strategy.
- This integrated LCR-Au-EDC approach offers a cost-effective and efficient tool for SNP genotyping.
