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Virtual-Partition Digital PCR for High-Precision Chromosomal Counting Applications.

Lucien Jacky1, Dominic Yurk1,2, John Alvarado1

  • 1ChromaCode Inc., 2330 Faraday Ave Suite 100, Carlsbad, California 92008, United States.

Analytical Chemistry
|December 14, 2021
PubMed
Summary

Virtual-partition digital PCR (VPdPCR) enhances genomic analysis by enabling multiplexed detection of over 10 targets per channel. This novel method improves quantification accuracy and overcomes limitations of traditional digital PCR (dPCR) for complex clinical applications.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Digital PCR (dPCR) is a high-precision method for genomic fragment quantification.
  • Current dPCR assays are limited to 1-2 analytes per sample, restricting clinical applications needing multi-analyte detection.
  • Existing dPCR methods face upper quantitation limits due to partitioning errors.

Purpose of the Study:

  • To introduce virtual-partition dPCR (VPdPCR), a novel analysis methodology.
  • To enable detection of 10+ target regions per color channel using standard dPCR hardware.
  • To overcome upper quantitation limits and reduce partitioning error in dPCR.

Main Methods:

  • VPdPCR establishes multiple fluorescence intensity thresholds to identify unique targets within positive partitions.
  • Each physical partition is virtually subdivided, increasing partition count and reducing error.
  • A 20-plex assay for noninvasive fetal aneuploidy testing was developed and validated.

Main Results:

  • VPdPCR allows detection of 10 or more targets per color channel.
  • VPdPCR analysis significantly reduces variance in chromosomal ratios and improves trisomy identification accuracy compared to traditional dPCR.
  • The 20-plex assay demonstrated >98% single-well sensitivity and specificity for trisomy identification.

Conclusions:

  • VPdPCR is a novel methodology that enhances dPCR capabilities for multiplexed genomic analysis.
  • VPdPCR overcomes limitations of traditional dPCR, offering improved accuracy and reduced error.
  • VPdPCR significantly expands the utility of dPCR for clinical applications requiring ultrahigh-precision, multi-analyte quantitation.