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DNA as a Genetic Template

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

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...

DNA Microarrays

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

PCR - Polymerase Chain Reaction

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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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Quadruplex-based molecular beacons as tunable DNA probes.

A Bourdoncle¹, A Estévez Torres, C Gosse

¹Département de Chimie, CNRS UMR 8640, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.

Journal of the American Chemical Society

|August 24, 2006

Summary

This study introduces G-quadruplex molecular beacons (G4-MBs) as a novel alternative to traditional DNA/RNA probes. G4-MBs offer enhanced sequence discrimination and design flexibility by utilizing G-quadruplex structures.

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Area of Science:

Molecular Biology
Biochemistry
Nucleic Acid Chemistry

Background:

Molecular beacons (MBs) are fluorescent probes for DNA/RNA detection.
Traditional MBs use Watson-Crick duplexes for stem formation.
MBs offer high mismatch discrimination in various settings.

Purpose of the Study:

To explore the use of G-quadruplex (G4) motifs as an alternative to Watson-Crick duplexes in MBs.
To investigate the feasibility and advantages of G4-based molecular beacons (G4-MBs).
To assess the potential for G4-MBs in oligonucleotide discrimination and diagnostics.

Main Methods:

Designed and synthesized G-quadruplex molecular beacons (G4-MBs).
Investigated G4-MB structure and function using complementary sequences.
Analyzed fluorescence emission changes upon G4-MB unfolding.
Explored thermodynamic and kinetic properties of G4-MBs.

Main Results:

Demonstrated that G-quadruplex motifs can replace Watson-Crick duplexes in MB stems.
Showcased G4-MBs' ability to discriminate oligonucleotides effectively.
Observed detectable fluorescence changes upon G4-MB unfolding due to duplex formation.
Identified opportunities for independent tuning of G4-MBs via cation concentration.

Conclusions:

G-quadruplex motifs can be successfully integrated into molecular beacons.
G4-MBs provide a versatile platform for nucleic acid detection with tunable properties.
This approach expands the design possibilities for functional molecular beacons.