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New realm of precision multiplexing enabled by massively-parallel single molecule UltraPCR.

Janice H Lai, Jung Won Keum, Haeun G Lee

    Biorxiv : the Preprint Server for Biology
    |October 24, 2023
    PubMed
    Summary

    UltraPCR partitions reactions into millions of compartments for isolated amplification, enabling highly multiplexed nucleic acid detection. This novel approach overcomes competition issues in traditional multiplex PCR, paving the way for advanced genomics assays.

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    Area of Science:

    • Molecular Biology
    • Biotechnology
    • Genomics

    Background:

    • Polymerase Chain Reaction (PCR) is a cornerstone of nucleic acid detection.
    • Multiplex PCR enhances sensitivity and reduces sample needs but faces challenges in amplification kinetics and target discrimination.
    • High-order multiplex PCR panels are difficult to adopt due to these limitations.

    Approach:

    • UltraPCR employs a centrifugation workflow to partition a single PCR reaction into approximately 34 million spatially separated compartments.
    • In situ thermocycling followed by light sheet scanning enables 3D reconstruction of fluorescent signals within the partitioned reaction.
    • This single-molecule partitioning isolates amplification events, preventing inter-target competition.

    Key Points:

    • UltraPCR facilitates isolated amplification, eliminating competition and ensuring unambiguous detection signals.
    • The system supports multiplexing up to 10 different fluorescent dyes in a single reaction.
    • Comboplex technology, using combinatorial fluorescent labeling, enables simultaneous detection of 22 targets with high precision.

    Conclusions:

    • UltraPCR offers a new paradigm for PCR amplification and multiplexed detection.
    • This technology has the potential to significantly expand the applications of PCR.
    • It enables a new generation of precision genomics assays with unprecedented multiplexing capabilities.