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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Updated: May 18, 2026

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

Published on: April 4, 2025

Intermolecular G-quadruplex structure-based fluorescent DNA detection system.

Hui Zhou1, Zai-Sheng Wu, Guo-Li Shen

  • 1State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.

Biosensors & Bioelectronics
|September 18, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel fluorescent DNA detection system using intermolecular G-quadruplex structures. This approach enhances fluorescence signal detection for genetic disease research and diagnostics.

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Combining QD-FRET and Microfluidics to Monitor DNA Nanocomplex Self-Assembly in Real-Time
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Fluorogenic detection probes often suffer from self-quenching when multiple dyes are in close proximity, hindering performance.
  • Restoring fluorescence in self-quenched systems remains a challenge for sensitive detection applications.

Purpose of the Study:

  • To develop a novel "multi-donors-to-one acceptor" fluorescent DNA detection system.
  • To leverage intermolecular G-quadruplex (IGQ) structures for enhanced fluorescence signal and hairpin oligonucleotides for improved probe design.

Main Methods:

  • Construction of a novel IGQ-hairpin fluorescent DNA detection system.
  • Utilizing the p53 gene as a model target DNA for system characterization.
  • Employing fluorescence spectroscopy to analyze signal enhancement and background inhibition.

Main Results:

  • The IGQ-hairpin system demonstrated improved assay performance compared to conventional methods.
  • Introduction of IGQ structure successfully inhibited background fluorescence.
  • Enhanced fluorescence restoration amplitude of fluorescein dyes was observed upon target DNA hybridization.

Conclusions:

  • The developed IGQ-hairpin system offers a promising strategy for sensitive fluorescent DNA detection.
  • This approach provides new insights into G-quadruplex structures for fluorescent probes.
  • The system has potential applications in fundamental research, diagnosis, and treatment of genetic diseases.