Pyrene-Modified Guanine Cluster Probes Forming DNA/RNA Hybrid Three-Way Junctions for Imaging of Intracellular...

Area of Science:

• Molecular Biology
• Biochemistry
• Biotechnology

Background:

• MicroRNAs (miRNAs) are crucial regulators of gene expression.
• Aberrant miRNA expression is linked to the development of various cancers.
• Existing methods for intracellular miRNA detection face limitations in sensitivity and specificity.

Purpose of the Study:

• To develop and characterize a novel fluorescent nucleic acid probe for intracellular miRNA detection.
• To investigate the performance of the G-cluster scaffold in a three-way junction system for miRNA sensing.
• To evaluate the probe's potential for application in cancer cell imaging and diagnostics.

Main Methods:

• Design and synthesis of a ^PyA-modified nucleic acid probe featuring a G-cluster scaffold.
• Formation of DNA/RNA hybrid three-way junction structures for miRNA detection.
• Spectroscopic analysis to assess fluorescence properties (emission wavelength, intensity, stability).
• Confocal microscopy to visualize intracellular miRNA detection in cancer cell lines.

Main Results:

• The G-cluster scaffold demonstrated a significant shift in emission wavelength upon duplex formation.
• The developed G-cluster three-way junction probes exhibited superior red-shifted fluorescence intensity and stability compared to previous A-cluster probes.
• Bright intracellular fluorescence signals were observed in cancer cell lines, indicating successful miRNA detection.

Conclusions:

• The novel G-cluster based fluorescent probe system enables sensitive and stable detection of intracellular miRNAs.
• This system shows promise as a potential tool for real-time monitoring of miRNA expression in living cells.
• The G-cluster probe has significant potential for intracellular nucleic acid detection and cancer diagnostics.