Detection of DNA Sequence with Enhanced Sensitivity and Higher FRET Efficiency Using a Light-Emitting Polymer,...

Area of Science:

• Biotechnology
• Materials Science
• Analytical Chemistry

Background:

• DNA detection is crucial for diagnostics and research.
• Existing biosensors often face limitations in sensitivity and cost-effectiveness.
• Peptide nucleic acids offer enhanced binding specificity for DNA detection.

Purpose of the Study:

• To develop a highly sensitive and cost-effective biosensor for DNA sequence detection.
• To investigate the effect of an anionic surfactant on biosensor performance.
• To utilize Förster Resonance Energy Transfer (FRET) for signal transduction.

Main Methods:

• Utilized a water-soluble cationic conjugated polymer (PFP) and single-strand DNA.
• Employed a fluorescently labeled peptide nucleic acid (PNAC*).
• Incorporated an anionic surfactant, sodium dodecyl sulfate (SDS), to enhance sensitivity.

Main Results:

• Achieved a tenfold improvement in biosensor detection sensitivity with SDS.
• Observed increased photoluminescence (PL) intensity of PNAC* for complementary DNA sequences in the presence of SDS.
• Observed decreased PL intensity of PNAC* for non-complementary sequences with SDS, enhancing signal discrimination.

Conclusions:

• The developed PFP/ssDNA/PNAC* system with SDS offers a sensitive, rapid, and cost-effective method for DNA detection.
• The anionic surfactant significantly enhances the FRET-based detection mechanism.
• This approach holds promise for various DNA-based diagnostic and analytical applications.