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Size-based molecular diagnostics using plasma DNA for noninvasive prenatal testing.

Stephanie C Y Yu1, K C Allen Chan1, Yama W L Zheng1

  • 1Centre for Research into Circulating Fetal Nucleic Acids, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China;Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong SAR, China;

Proceedings of the National Academy of Sciences of the United States of America
|May 21, 2014
PubMed
Summary

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This summary is machine-generated.

This study introduces a novel size-based method for noninvasive prenatal testing using fetal DNA in maternal plasma. The approach accurately detects chromosomal aneuploidies by analyzing DNA fragment lengths, offering a new diagnostic parameter.

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Noninvasive prenatal testing (NIPT) is crucial for detecting fetal genetic abnormalities.
  • Current NIPT methods rely on sequencing plasma DNA and counting sequence origins.
  • Fetal DNA in maternal plasma exhibits distinct size characteristics compared to maternal DNA.

Purpose of the Study:

  • To explore DNA fragment size as a diagnostic parameter for NIPT.
  • To develop a size-based approach for determining fetal DNA fraction in maternal plasma.
  • To detect fetal chromosomal aneuploidies using plasma DNA size distribution.

Main Methods:

  • Paired-end massively parallel sequencing of maternal plasma DNA.
  • Microchip-based capillary electrophoresis for DNA size analysis.
Keywords:
Down syndromeTurner syndromefetal aneuploidynext-generation sequencingsize profiling

Related Experiment Videos

  • Analysis of DNA fragment size distribution to deduce fetal DNA fraction and detect aneuploidy.

    • Main Results:

    • Demonstrated that plasma DNA size distribution can determine the fetal DNA fraction.
    • Detected trisomy 21 and 18 with 100% sensitivity and specificity.
    • Achieved high sensitivity and specificity for trisomy 13 and monosomy X detection.

    Conclusions:

    • Establishes the principle of size-based molecular diagnostics using plasma DNA.
    • Highlights the potential of this approach for NIPT and other applications like oncology and transplantation monitoring.
    • Offers a novel, size-dependent diagnostic parameter for cell-free DNA analysis.