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Updated: Sep 2, 2025

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection
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Sensing Base Modifications in Non-Canonically Folded DNA with an Optimized Host:Guest Sensing Array.

Junyi Chen, Briana L Hickey, Ziting Gao

    ACS Sensors
    |August 2, 2022
    PubMed
    Summary
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    This study introduces a novel fluorescence sensor array that detects subtle DNA G-quadruplex folding changes from single oxidation or methylation modifications. This method offers a powerful tool for identifying DNA damage in biological samples.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Analytical Chemistry

    Background:

    • DNA G-quadruplexes (G4) are crucial secondary structures involved in various biological processes.
    • Subtle modifications like oxidation or methylation can alter G4 folding, impacting function.
    • Detecting these subtle changes is challenging with conventional methods like Circular Dichroism (CD).

    Purpose of the Study:

    • To develop a sensitive fluorescence sensor system for discriminating G4 structures with minor modifications.
    • To investigate the system's ability to detect single oxidation or methylation on guanine bases.
    • To assess the sensor's functionality in biological matrices like diluted serum.

    Main Methods:

    • An arrayed host:guest fluorescence sensor system was designed and utilized.
    Keywords:
    BiosensorsDNA damageDNA structuresModified nucleobasesMolecular recognition

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  • The system was challenged with G4 structures containing single oxidation or methylation modifications.
  • Differential fluorescence responses were analyzed to identify structural changes.
  • Sensing performance was evaluated in diluted human serum.

    • Main Results:

    • The fluorescence sensor array successfully discriminated between G4 structures differing only by single oxidation or methylation.
    • Subtle G4 folding alterations, undetectable by CD, induced distinct fluorescence signals.
    • The system demonstrated functionality and specificity in diluted serum.
    • Individual modifications within DNA mixtures were distinguishable.

    Conclusions:

    • The arrayed host:guest fluorescence sensor is a powerful tool for detecting subtle G4 folding changes.
    • This method enables the identification of specific modifications indicative of DNA damage.
    • The system holds promise for sensitive diagnostics and research in DNA damage and repair.