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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Visualizing the quadruplex: from fluorescent ligands to light-up probes.

Eric Largy¹, Anton Granzhan, Florian Hamon

¹UMR 176 CNRS "Synthèse, Conception et Vectorisation de Biomolécules", Institut Curie, Centre de Recherche, 91405, Orsay, France.

Topics in Current Chemistry

|August 14, 2012

Summary

Developing fluorescent probes for detecting nucleic acid quadruplex structures is crucial. This review overviews molecular designs and strategies for creating selective fluorescent probes, categorizing them by their detection mechanism.

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Area of Science:

Biochemistry
Molecular Biology
Chemical Biology

Background:

Visual detection of nucleic acid quadruplex structures remains a significant challenge in molecular research.
There is a continuous need for novel agents with fluorescence properties for specific quadruplex identification.
Current research focuses on developing selective fluorescent probes for quadruplexes.

Purpose of the Study:

To provide a comprehensive review of molecular designs and strategies for quadruplex-selective fluorescent probes.
To critically evaluate innovative and classical compounds used as fluorescent probes for quadruplexes.
To discuss the application and performance of these probes in various analytical contexts.

Main Methods:

Categorization of fluorescent probes into three classes: "light-up", "light-off", and permanent probes.
Review of diverse molecular designs and strategies employed in probe development.
Analysis of labeling performances in different biological contexts (solution, gel, chromosomes, cells).

Main Results:

Probes are classified based on fluorescence response to quadruplex binding: enhanced ("light-up"), decreased ("light-off"), or no change (permanent).
The review covers both novel compounds and established DNA dyes.
Labeling performances are assessed across various applications, highlighting their utility and limitations.

Conclusions:

The development of practicable quadruplex-specific labeling agents requires careful consideration of probe design and application context.
Each probe class presents unique strengths and weaknesses that influence their suitability for different research needs.
Further advancements are needed to optimize the sensitivity, specificity, and usability of fluorescent probes for nucleic acid quadruplexes.