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Updated: May 20, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
05:37

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

Published on: April 4, 2025

Higher-order quadruplex structures.

Luigi Petraccone1

  • 1Dipartimento di Scienze Chimiche, Università degli Studi di Napoli "Federico II", Via Cintia, 80126, Napoli, Italy, luigi.petraccone@unina.it.

Topics in Current Chemistry
|July 14, 2012
PubMed
Summary
This summary is machine-generated.

Higher-order G-quadruplex structures can form in long DNA sequences, particularly in human telomeres. Research explores their formation, topology, and binding properties, advancing understanding of these complex DNA architectures.

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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers

Published on: September 19, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Four G-tracts are the minimum for intramolecular G-quadruplex formation.
  • Longer DNA sequences with multiple G-tracts can form higher-order structures.
  • The human telomeric overhang (~200 nt) with TTAGGG repeats is a prime candidate for such structures.

Purpose of the Study:

  • To investigate the formation, topology, and binding properties of higher-order G-quadruplex structures in the human telomeric overhang.
  • To review recent experimental and computational studies addressing these complex DNA architectures.
  • To highlight the relevance of higher-order quadruplex structures in the human genome.

Main Methods:

  • Review of experimental studies.
  • Analysis of computational studies.
  • Exploration of G-quadruplex structural data.

Main Results:

  • The human telomeric overhang can form higher-order G-quadruplex structures.
  • Multiple quadruplex units and various topologies are possible.
  • Binding properties and interactions of these structures are under active investigation.

Conclusions:

  • Higher-order G-quadruplex structures in telomeres represent a significant and stimulating research area.
  • Further research is needed to fully understand their structure, function, and implications in the human genome.
  • Studies on telomeric RNA and non-telomeric DNA higher-order quadruplexes provide broader context.