Gold-silver-alloy nanoprobes for one-pot multiplex DNA detection

Area of Science:

• Nanotechnology
• Biotechnology
• Molecular Diagnostics

Background:

• Gold-silver-alloy nanoparticles offer unique optical properties for biosensing.
• The TP53 gene is a critical tumor suppressor gene frequently mutated in various cancers.
• Multiplex DNA detection assays are crucial for comprehensive genetic analysis.

Purpose of the Study:

• To develop a novel colorimetric DNA detection method using oligonucleotide-functionalized gold-silver-alloy nanoparticles (AuAg-alloy-nanoprobes).
• To demonstrate the specific detection of a TP53 gene sequence using the developed AuAg-alloy-nanoprobes.
• To establish a one-pot dual-colorimetric detection strategy for simultaneous differential detection of two distinct DNA sequences.

Main Methods:

• Synthesis and functionalization of gold-silver-alloy nanoparticles with specific oligonucleotides.
• Colorimetric detection of target DNA sequences based on nanoparticle aggregation or disaggregation.
• Development of a multiplex assay combining AuAg-alloy-nanoprobes and gold (Au)-nanoprobes for dual-colorimetric detection.

Main Results:

• The AuAg-alloy-nanoprobes specifically detected the target DNA sequence from the TP53 gene.
• A one-pot dual-colorimetric assay was successfully established, enabling simultaneous detection of two different DNA sequences.
• The system demonstrated high sensitivity and specificity for DNA detection.

Conclusions:

• Oligonucleotide-functionalized AuAg-alloy-nanoprobes provide a sensitive and specific platform for colorimetric DNA detection.
• The developed one-pot dual-colorimetric strategy offers a promising approach for multiplex DNA analysis.
• This work opens new avenues for developing advanced colorimetric assays for genetic disease detection and research.