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Digital PCR using micropatterned superporous absorbent array chips.

Yazhen Wang1, Kristopher M Southard, Yong Zeng

  • 1Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA. yongz@ku.edu.

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PubMed
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A new micropatterned superporous absorbent array chip (μSAAC) enables digital PCR (dPCR) by spontaneously filling microwells for DNA analysis. This low-cost, easy-to-use device facilitates genetic analysis and disease mutation detection in standard labs.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Genetics

Background:

  • Digital PCR (dPCR) is a powerful genetic analysis tool with growing clinical diagnostic applications.
  • Widespread adoption of dPCR is hindered by the need for complex microfluidic equipment and expertise.
  • Developing accessible and user-friendly dPCR platforms is crucial for broader implementation.

Purpose of the Study:

  • To develop a novel, equipment-free platform for digital PCR (dPCR) to enhance accessibility.
  • To create a micropatterned superporous absorbent array chip (μSAAC) for spontaneous fluid compartmentalization.
  • To validate the μSAAC for accurate digital detection of DNA molecules and disease-associated mutations.

Main Methods:

  • Fabrication of a micropatterned superporous absorbent array chip (μSAAC) using agarose microbeads.

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  • Utilizing the chip's water adsorption capacity for spontaneous filling and fluid compartmentalization.
  • Validation using large λ-DNA for stochastic partitioning and digital DNA detection.
  • Proof-of-concept dPCR detection and single-molecule sequencing of the t(14;18) chromosomal translocation.

    • Main Results:

    • The μSAAC successfully enabled spontaneous filling of microwells for fluid compartmentalization without complex microfluidics.
    • Accurate digital detection of DNA molecules was achieved using the μSAAC with large λ-DNA.
    • The chip demonstrated feasibility for detecting disease-associated mutations, including the t(14;18) translocation relevant to blood cancer.
    • Experiments utilized standard molecular biology techniques and instruments.

    Conclusions:

    • The developed μSAAC offers a low-cost, user-friendly, and equipment-free solution for digital PCR (dPCR).
    • Its ease of fabrication and operation makes it adaptable to general laboratory settings.
    • This technology has the potential to significantly accelerate the application of dPCR in basic research and clinical diagnostics.