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Related Experiment Video

Updated: Jul 4, 2026

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

Four-stranded nucleic acids: structure, function and targeting of G-quadruplexes.

Julian Leon Huppert¹

¹Cavendish Laboratory, University of Cambridge, JJ Thomson Ave, Cambridge, UKCB3 0HE. jlh29@cam.ac.uk

Chemical Society Reviews

|June 24, 2008

Summary

G-quadruplex structures, rich in guanine, offer alternatives to DNA duplexes. These structures are crucial in biological processes and are key targets for drug development.

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Area of Science:

Biochemistry
Structural Biology
Molecular Biology

Background:

Nucleic acids adopt diverse structures beyond the canonical Watson-Crick duplex.
Guanine-rich sequences can form G-quadruplex structures with unique topologies.

Purpose of the Study:

To review the formation, structure, and biological significance of G-quadruplexes.
To explore methods for studying G-quadruplexes and their interactions with ligands and proteins.

Main Methods:

Literature review of G-quadruplex formation, chemical interactions, and topological variants.
Discussion of biophysical and biochemical techniques used for G-quadruplex structure determination.
Analysis of proposed biological roles, particularly in telomeres and gene promoters.

Main Results:

G-quadruplexes are formed through specific chemical interactions involving guanine bases.
Various topological forms of G-quadruplexes exist.
G-quadruplexes are implicated in critical cellular functions, including telomere maintenance and gene regulation.
These structures serve as targets for small-molecule ligands and natural proteins.

Conclusions:

G-quadruplex structures represent an important class of nucleic acid conformations with significant biological relevance.
Understanding G-quadruplexes is vital for developing novel therapeutic strategies targeting diseases associated with telomere dysfunction and aberrant gene expression.