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Labeling DNA Probes

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 4, 2026

Production and Targeting of Monovalent Quantum Dots

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

DNA-triggered dye transfer on a quantum dot.

Julia Michaelis¹, Gerbrand Jan van der Heden van Noort, Oliver Seitz

¹Humboldt-Universität zu Berlin , Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.

Bioconjugate Chemistry

|December 17, 2013

Summary

This summary is machine-generated.

This study introduces a novel DNA-triggered reaction for enhanced fluorescence resonance energy transfer (FRET) detection. This method improves signal amplification and enables sensitive DNA diagnostics with single-base mismatch discrimination.

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Area of Science:

Biochemistry
Molecular Biology
Nanotechnology

Background:

Nucleic acid-templated reactions are vital for DNA diagnostics.
Fluorescence resonance energy transfer (FRET) is a common detection method, but spectral cross-talk limits signal enhancement.
Existing methods often require probe separation for accurate detection.

Purpose of the Study:

To develop a separation-free DNA detection method with enhanced FRET signals.
To overcome spectral cross-talk limitations in DNA-directed FRET assays.
To enable sensitive and specific detection of DNA sequences.

Main Methods:

A DNA-triggered transfer reaction was developed for probe molecules.
This reaction covalently attaches a fluorescent dye to a quantum dot (QD) surface.
The method utilizes DNA and peptide nucleic acid (PNA) probes.

Main Results:

A 35-fold increase in the FRET signal was observed.
The reaction significantly enhances proximity between the dye and QD.
The method demonstrated efficient discrimination of single-base mismatched DNA templates.
Signal amplification was achieved through template turnover.

Conclusions:

The developed DNA-triggered reaction provides a robust platform for sensitive, separation-free DNA detection.
This approach significantly enhances FRET signals and allows for precise discrimination of DNA sequences.
The method holds promise for advancing nucleic acid diagnostics.