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Updated: May 29, 2025
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
327
Quencher-Free Fluorescence Monitoring of G-Quadruplex Folding
Zachary Parada1, Tanner G Hoog2, Katarzyna P Adamala1,2
1Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 321 Church Street SE, Minneapolis, Minnesota 55455, United States.
ACS Omega
|February 3, 2025
Summary
New quencher-free assays monitor G-quadruplex DNA folding transitions. This low-cost method accelerates synthetic biology development by enabling rapid prototyping of G-rich sequence systems.
Area of Science:
- Molecular Biology
- Synthetic Biology
- Biophysics
Background:
- Guanine-rich sequences are structurally versatile, forming various DNA structures like G-quadruplexes.
- These sequences are crucial in synthetic biology due to their plasticity.
- Efficient tools to monitor G-quadruplex folding are needed to accelerate synthetic biology design-build-test cycles.
Purpose of the Study:
- To develop a low-cost, high-throughput method for monitoring G-quadruplex folding and unfolding transitions.
- To enable faster prototyping and development of synthetic biology systems utilizing G-rich sequences.
Main Methods:
- Utilized a Förster Resonance Energy Transfer (FRET)-like format with single dye-labeled DNA sequences.
- Developed quencher-free assays to monitor secondary structure transitions.
- Applied the method to a range of G-quadruplex-forming DNA sequences.
Main Results:
- Demonstrated successful monitoring of unfolding transitions for various G-quadruplex DNA sequences.
- Achieved low-cost assays with significantly reduced lead times compared to traditional FRET methods.
- Established a viable alternative to FRET-labeled strands for secondary structure monitoring.
Conclusions:
- Quencher-free secondary structure monitoring is an effective and economical tool.
- This method accelerates the testing and development of synthetic biology systems involving G-quadruplexes.
- The technology supports rapid prototyping and design iterations in synthetic biology.
