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Labeling DNA Probes

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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.
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Real-time Imaging of Single Engineered RNA Transcripts in Living Cells Using Ratiometric Bimolecular Beacons

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Published on: August 6, 2014

A polycation-chaperoned in-stem molecular beacon system.

Hiroyuki Asanuma¹, Takuya Osawa, Hiromu Kashida

¹Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan. asanuma@mol.nagoya-u.ac.jp

Chemical Communications (Cambridge, England)

|January 6, 2012

Summary

Poly(L-lysine)-graft-dextran enhances molecular beacons for DNA detection. These beacons show a high signal ratio and rapid response times for accurate sensing.

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Area of Science:

Biochemistry
Molecular Biology
Materials Science

Background:

Molecular beacons are DNA-sensitive fluorescent probes.
Optimizing signal and response time is crucial for sensitive detection.

Purpose of the Study:

To investigate the effect of poly(L-lysine)-graft-dextran on in-stem molecular beacon performance.
To evaluate the signal-to-background ratio and response kinetics of the modified beacons.

Main Methods:

Utilized an in-stem molecular beacon design with perylene-anthraquinone pairs.
Incorporated poly(L-lysine)-graft-dextran in the assay.
Measured signal/background ratio and response time upon addition of substrate DNA.

Main Results:

Achieved a high signal/background ratio of 570 with poly(L-lysine)-graft-dextran.
Demonstrated rapid response kinetics, reaching equilibrium within 5 minutes at 20 °C.

Conclusions:

Poly(L-lysine)-graft-dextran significantly enhances the performance of in-stem molecular beacons.
The modified beacons offer a sensitive and rapid platform for DNA detection.