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Related Experiment Video

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Colocalized Particle Counting Platform for Zeptomole Level Multiplexed Quantification.

Guangyu Tao1, Tiancheng Lai1, Xiao Xu2

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Analytical Chemistry
|February 11, 2020
PubMed
Summary

This study introduces a novel colocalized particle counting platform for sensitive, high-throughput, and convenient multiplexed detection of nucleic acids. The system enables simultaneous detection of multiple DNA and miRNA targets with high accuracy, validated against qRT-PCR.

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Nanotechnology

Background:

  • Multiplexed detection of nucleic acids faces challenges in balancing sensitivity, throughput, and ease of use.
  • Existing methods often require complex separation steps, limiting practical applications.

Purpose of the Study:

  • To develop a separation-free platform for sensitive and high-throughput multiplexed detection of nucleic acid targets.
  • To demonstrate the platform's capability in detecting DNA and microRNA (miRNA) with high specificity and accuracy.

Main Methods:

  • Utilized a colocalized particle counting approach where target-induced hybridization forms sandwich nanostructures.
  • Employed dual-color microbeads for sequence-specific coding via fluorescence channels.
  • Developed a method for separation-free, multiplexed detection of up to 6 nucleic acid targets.

Main Results:

  • Achieved zeptomole sensitivity and a dynamic range of 5 orders of magnitude for nucleic acid detection.
  • Demonstrated minimal cross-talk and matrix effects, with successful differentiation of closely related miRNAs.
  • Validated simultaneous detection of 3 miRNAs in cell lines, showing consistency with quantitative reverse transcription polymerase chain reaction (qRT-PCR).

Conclusions:

  • The colocalized particle counting platform offers a robust, sensitive, and convenient solution for multiplexed nucleic acid detection.
  • The platform is adaptable to different experimental designs and extensible to other signal sources, paving the way for on-site detection.
  • This technology significantly advances the field of molecular diagnostics by overcoming key limitations of current multiplexing techniques.