Single-Molecule FRET-Based Dynamic DNA Sensor.

Area of Science:

• Biomolecular Engineering
• Molecular Diagnostics
• Cancer Genomics

Background:

• Ultrasensitive nucleic acid detection is crucial for early disease diagnosis and targeted therapy.
• Current methods often rely on complex designs or target amplification.
• The p53 tumor suppressor gene is frequently mutated in human cancers.

Purpose of the Study:

• To develop a simple, background-free platform for ultrasensitive detection of nucleic acid biomarkers.
• To demonstrate the utility of this platform for detecting p53 gene mutations.
• To establish a method for early disease diagnosis and genetic disorder screening.

Main Methods:

• Utilized a Förster Resonance Energy Transfer (FRET)-based sensor with dynamic switching behavior.
• Employed a simple, generic hybridization-based detection platform.
• Assessed sensor performance in detecting p53 gene sequences and discriminating against single-nucleotide polymorphisms (SNPs).

Main Results:

• Achieved a background-free, ultrasensitive detection limit down to low femtomolar (fM) concentrations without target amplification.
• Demonstrated continuous dynamic switching between low- and high-FRET states in the presence of the target p53 gene.
• Showcased high efficacy in discriminating against single-nucleotide polymorphisms (SNPs).

Conclusions:

• The developed sensor offers a simple yet powerful approach for ultrasensitive nucleic acid detection.
• This platform holds significant potential for early disease diagnosis and genetic disorder screening.
• The generic nature of the platform allows for broad applicability to various nucleic acid targets.