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Multicolor fluorescent biosensor for multiplexed detection of DNA.

Rong Hu1, Tao Liu, Xiao-Bing Zhang

  • 1Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Biology, Collaborative Innovation Center of Molecular Engineering for Theranostics, Hunan University , Changsha 410082, P.R. China.

Analytical Chemistry
|April 16, 2014
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Summary

Researchers developed a novel multicolor biosensor for rapid DNA detection. This sensitive assay uses a perylene diimide (PDI) derivative to efficiently quench fluorescence, enabling early disease diagnosis through multiplexed oligonucleotide screening.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • Sensitive and rapid screening of oligonucleotide sequences is crucial for early disease diagnosis.
  • Existing methods often lack the sensitivity or multiplexing capabilities required for comprehensive diagnostics.

Purpose of the Study:

  • To develop a novel, highly sensitive, and rapid multicolor biosensor for multiplexed fluorescent detection of DNA.
  • To utilize an aggregated cationic perylene diimide (PDI) derivative as a broad-spectrum fluorescence quencher.

Main Methods:

  • Development of a label-free multicolor biosensor using an aggregated PDI derivative as a broad-spectrum quencher.
  • Integration of exonuclease-assisted autocatalytic target recycling amplification for enhanced sensitivity.
  • Utilizing anionic oligonucleotide-labeled fluorophores emitting across visible to near-infrared (NIR) regions.

Main Results:

  • The PDI derivative demonstrated high quenching efficiency (97-98.3%) for various fluorophores (FAM, TAMRA, Cy5).
  • The integrated system achieved a low detection limit of 20 pM for target DNA, a 50-fold improvement over unamplified methods.
  • The biosensor enabled simultaneous, multicolor analysis of multiple oligonucleotides in homogeneous solution.

Conclusions:

  • The developed biosensor offers high sensitivity, rapid screening, and multiplexing capabilities for oligonucleotide detection.
  • This technology holds significant potential for early diagnosis and rapid screening of multiple biotargets.
  • The label-free, homogeneous assay format simplifies detection procedures.