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Rapid Amplification-Free Microarray-Based Ultrasensitive Detection of DNA.

Yuri M Shlyapnikov1, Ekaterina A Malakhova1, Elena A Shlyapnikova1

  • 1Institute of Theoretical and Experimental Biophysics , Russian Academy of Sciences , Pushchino , Moscow Region, 142290 , Russia.

Analytical Chemistry
|July 31, 2019
PubMed
Summary

This study introduces a rapid, multiplex microarray assay for detecting DNA fragments with high sensitivity. The method achieves fast and accurate DNA detection, enabling simultaneous identification of multiple microbial genomes.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Accurate and rapid detection of DNA fragments is crucial for various applications, including diagnostics and research.
  • Existing methods may face limitations in speed, sensitivity, or multiplexing capabilities.

Purpose of the Study:

  • To develop a novel multiplex microarray-based assay for highly sensitive and rapid DNA fragment detection.
  • To demonstrate the assay's capability for simultaneous detection of multiple DNA targets.

Main Methods:

  • Hybridization of biotinylated adapter oligonucleotides to DNA fragments.
  • Electrophoretic concentration of DNA onto a microarray surface.
  • Detection of biotin labels using streptavidin-coated magnetic beads and microarray scanning.
  • Denaturation, annealing, and hybridization of single-stranded DNA (ssDNA) fragments with oligonucleotide probes.

Main Results:

  • Achieved detection of less than 10,000 DNA fragments (∼0.1 fM) in 100 μL within 5 minutes.
  • Demonstrated multiplexity by simultaneously detecting genomic DNA from *E. coli*, *B. cereus*, and *M. neoaurum*.
  • High speed and sensitivity attributed to adapter hybridization, electrophoretic concentration, and magnetic bead-based detection.

Conclusions:

  • The developed multiplex microarray assay offers a significant advancement in rapid and sensitive DNA detection.
  • This assay platform holds potential for diverse applications requiring simultaneous identification of multiple DNA targets.
  • The assay's speed and sensitivity make it suitable for time-critical analyses and low-concentration sample detection.