Ethyl-substitutive Thioflavin T as a highly-specific fluorescence probe for detecting G-quadruplex structure

Area of Science:

• Biochemistry
• Molecular Biology
• Chemical Biology

Background:

• G-quadruplex structures are prevalent in functional genomic regions and transcripts.
• These structures play crucial roles in telomere maintenance, gene transcription, and translation.
• Accurate identification of G-quadruplex is vital for research, diagnostics, and therapeutics.

Purpose of the Study:

• To design and synthesize a novel fluorescent dye, ThT-E, for differentiating G-quadruplex structures.
• To evaluate the affinity, selectivity, and G-quadruplex inducing effects of ThT-E.
• To establish ThT-E as a visual tool for G-quadruplex detection.

Main Methods:

• Synthesis of ThT-E, a derivative of Thioflavin T (ThT) with ethyl modifications.
• Spectroscopic analysis to assess the dye's interaction with various nucleic acid forms.
• Visual observation of G-quadruplex solutions under ultraviolet light.

Main Results:

• ThT-E demonstrated enhanced affinity and selectivity for G-quadruplex structures compared to ThT.
• The ethyl groups in ThT-E minimized induction of G-quadruplex formation.
• ThT-E enabled direct visual differentiation of G-quadruplex solutions under UV light.

Conclusions:

• ThT-E is a promising fluorescent probe for accurate G-quadruplex identification.
• The probe facilitates high-throughput screening assays for G-quadruplex.
• ThT-E holds potential for G-quadruplex-based diagnostics and therapies.