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Intermolecular dark resonance energy transfer (DRET): upgrading fluorogenic DNA sensing.

Guillaume Barnoin1, Janah Shaya1, Ludovic Richert2

  • 1Université Côte d'Azur, CNRS, Institut de Chimie de Nice, UMR 7272 - Parc Valrose, 06108 Nice cedex 2, France.

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Researchers developed a novel intermolecular Dark Resonance Energy Transfer (DRET) pair for enhanced nucleic acid sensing. This method overcomes FRET limitations, improving signal-to-noise ratio for precise sequence detection with low background noise.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Analytical Chemistry
  • Biotechnology

Background:

  • Förster Resonance Energy Transfer (FRET) based sensing suffers from spectral overlaps, leading to poor signal-to-noise ratios.
  • Dark Resonance Energy Transfer (DRET) offers improved signal-to-noise by using a quenched donor and a bright acceptor, minimizing spectral overlap.
  • Existing DRET systems primarily utilize covalently linked donor-acceptor pairs.

Purpose of the Study:

  • To develop the first intermolecular DRET pair for specific nucleic acid sequence sensing.
  • To overcome the limitations of traditional FRET sensing in biological applications.
  • To create a sensitive and specific molecular probe for DNA detection.

Main Methods:

  • Design and synthesis of DFK, a push-pull probe acting as a DRET donor.
  • Incorporation of DFK into oligonucleotides for intermolecular DRET with Cy5-labeled complementary sequences.
  • Utilized time-resolved fluorescence measurements to confirm the DRET mechanism and binary probes to assess distance dependence.

Main Results:

  • Demonstrated successful intermolecular DRET between the dark donor (DFK) and Cy5 acceptor upon duplex formation.
  • Observed efficient switching on of far-red Cy5 emission with minimal donor cross-excitation.
  • Confirmed DRET's distance dependence and its efficacy in detecting specific nucleic acid sequences with high sensitivity and low background.

Conclusions:

  • The developed intermolecular DRET pair provides a sensitive and specific method for nucleic acid detection.
  • This approach significantly enhances the signal-to-noise ratio compared to conventional FRET methods.
  • The DRET strategy holds promise for various molecular sensing and diagnostic applications.