Wireless electrochemiluminescence bipolar electrode array for visualized genotyping of single nucleotide polymorphism

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Nanotechnology

Background:

• Developing user-friendly, high-throughput DNA genotyping methods for single nucleotide polymorphisms (SNPs) is crucial for routine genetic analysis.
• Visualizing SNP signals with digital cameras offers a promising avenue for accessible diagnostic tools.

Purpose of the Study:

• To introduce a novel wireless electrochemiluminescence (ECL) DNA array for visualized genotyping of various SNPs.
• To demonstrate a user-friendly, cost-effective biosensor suitable for non-specialist use in high-throughput genetic analysis.

Main Methods:

• Utilized a bipolar electrode (BPE) array platform for an electrochemiluminescence (ECL) DNA array.
• Employed luminol/hydrogen peroxide system and monobase modified luminol-platinum nanoparticles (M-L-PtNPs) for SNP detection.
• Visualized and analyzed ECL signals using a photomultiplier tube (PMT) or digital camera and ImageJ software.

Main Results:

• The developed biosensor successfully performed visualized genotyping of different SNPs.
• Achieved detection of thermodynamically stable SNP (G-T mismatches) in the range of 2-600 pM.
• Demonstrated capability to discriminate between PCR products for normal, heterozygous, and homozygous beta-thalassemia genetic disorders.

Conclusions:

• The wireless ECL DNA array offers a simple, inexpensive, and user-friendly platform for high-throughput SNP genotyping.
• The combination of BPE and ECL provides high visual sensitivity for effective SNP screening.
• This biosensor holds potential for routine genetic disorder screening and personalized medicine applications.