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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Related Experiment Video

Updated: Jul 27, 2026

Examination of the Telomere G-overhang Structure in Trypanosoma brucei

Examination of the Telomere G-overhang Structure in Trypanosoma brucei

Published on: January 26, 2011

Effect of complementary C-strand on telomere G-quartet structure.

K Kanaori¹, A Moriyama, T Shoji

¹Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.

Nucleic Acids Research. Supplement (2001)

|July 3, 2003

Summary

The study explores G-quartet structures and their stability when interacting with a complementary C-strand. Ion concentration, specifically sodium (Na+) or potassium (K+), influences the balance between duplex and G-quartet formation.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

G-quartets are four-guanine-rich structures crucial in various biological processes.
Understanding G-quartet stability is key to deciphering their roles in gene regulation and disease.

Purpose of the Study:

To investigate the structural dynamics and stability of G-quartets in the presence of their complementary C-strand.
To determine how different cation types (Na+ and K+) affect the equilibrium between G-quartet and duplex forms.

Main Methods:

Spectroscopic techniques to analyze G-quartet formation.
Biophysical assays to assess structural stability.
Computational modeling to understand ion-mediated interactions.

Main Results:

The complementary C-strand influences G-quartet formation and stability.
Sodium (Na+) and potassium (K+) ions differentially modulate the equilibrium between duplex and G-quartet structures.
Specific ion concentrations favor either the duplex or G-quartet conformation.

Conclusions:

Cation-dependent structural transitions are critical for G-quartet function.
The interplay between G-quartets, C-strands, and ions offers insights into nucleic acid structural polymorphism.
This research provides a foundation for understanding G-quartet roles in biological systems.