A triplex-forming linear probe for sequence-specific detection of duplex DNA with high sensitivity and affinity.

Area of Science:

• Biochemistry
• Molecular Biology
• Analytical Chemistry

Background:

• Oligonucleotide-based probes are crucial for molecular diagnostics.
• Developing probes with enhanced stability and sensitivity is an ongoing challenge.
• Fluorescent detection methods offer high sensitivity for nucleic acid analysis.

Purpose of the Study:

• To synthesize and characterize a novel triplex-forming oligonucleotide (TFO) linear probe.
• To evaluate the probe's ability to form stable triplex structures with target DNA.
• To assess the probe's fluorescence properties and sensitivity for DNA detection.

Main Methods:

• Synthesis of a TFO linear probe incorporating perylene derivatives.
• Formation of DNA triplex structures between the probe and target DNA duplex.
• Fluorescence spectroscopy to monitor emission upon triplex formation.
• Testing probe performance at physiological pH (pH 7).
• Demonstration of detection using PCR-amplified DNA.

Main Results:

• The synthesized TFO linear probe successfully formed a stable triplex with target DNA.
• A significant "light-up" of fluorescence emission was observed upon triplex formation.
• The probe exhibited extremely high sensitivity, functioning effectively even at pH 7.
• Successful detection of PCR-amplified target DNA was achieved.

Conclusions:

• The perylene-containing TFO linear probe is a stable and highly sensitive tool for DNA detection.
• This probe technology offers a promising approach for sensitive nucleic acid analysis in biological samples.
• The probe's functionality at neutral pH broadens its applicability in various diagnostic assays.