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Updated: May 13, 2026
04:18
DNA Electrophoresis Using Thiazole Orange Instead of Ethidium Bromide or Alternative Dyes
Published on: March 31, 2019
Fluorescent triplex-forming DNA oligonucleotides labeled with a thiazole orange dimer unit
Shuji Ikeda1, Hiroyuki Yanagisawa, Mizue Yuki
1Advanced Science Institute, RIKEN, Saitama, Japan. s-ikeda@riken.jp
Artificial DNA, PNA & XNA
|March 1, 2013
Summary
New fluorescent probes, called exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes, were developed for detecting double-stranded DNA. These probes utilize thiazole orange dimer units to suppress background fluorescence, enhancing detection accuracy.
Area of Science:
- Molecular Biology
- Biochemistry
- Organic Chemistry
Background:
- Fluorescent probes are essential tools for nucleic acid detection.
- Existing probes can suffer from high background fluorescence, limiting sensitivity.
- Exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes offer a novel approach to enhance fluorescence detection.
Purpose of the Study:
- To develop and characterize novel fluorescent probes for double-stranded DNA detection.
- To investigate the potential of exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes for improved fluorescence-based assays.
- To evaluate the performance of ECHO probes by assessing their thermal stability, photophysical, and kinetic properties.
Main Methods:
- Synthesis of triplex-forming DNA oligonucleotides labeled with a thiazole orange (TO) dimer unit.
- Formation of DNA triplexes using the synthesized ECHO probes.
- Characterization of DNA triplexes through thermal stability analysis.
- Photophysical property assessment, including fluorescence emission and quantum yield.
- Kinetic studies to determine binding and dissociation rates.
Main Results:
- Successful preparation of fluorescent probes based on thiazole orange dimer-labeled DNA oligonucleotides.
- Demonstration of suppressed background fluorescence due to excitonic interactions between TO molecules.
- Confirmation of DNA triplex formation with the ECHO probes.
- Characterization revealed favorable thermal stability, photophysical, and kinetic properties for DNA detection.
Conclusions:
- Exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes are effective for detecting double-stranded DNA.
- The design effectively suppresses background fluorescence, leading to improved signal-to-noise ratios.
- These probes represent a promising advancement in fluorescent nucleic acid detection technologies.
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