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Genomic Imprinting and Inheritance

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Fetal DNA in maternal plasma: progress through epigenetics.

Y M Dennis Lo1

  • 1Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, 30-32 Ngan Shing Street, Shatin, New Territories, Hong Kong SAR, China. loym@cuhk.edu.hk

Annals of the New York Academy of Sciences
|November 17, 2006
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Summary

Noninvasive prenatal diagnosis is advancing with cell-free fetal DNA. Researchers developed a universal fetal epigenetic marker for detecting fetal DNA in maternal plasma, regardless of gender or genetics.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Cell-free fetal DNA (cffDNA) in maternal plasma enables noninvasive prenatal diagnosis.
  • Current methods often rely on detecting fetal genetic markers distinct from maternal DNA.
  • Early research demonstrated the potential of fetal epigenetic markers in maternal plasma.

Purpose of the Study:

  • To introduce a universal fetal epigenetic marker for noninvasive prenatal diagnosis.
  • To enable fetal DNA detection irrespective of fetal gender and genetic polymorphisms.
  • To advance the clinical application of circulating fetal DNA for prenatal testing.

Main Methods:

  • Utilized an imprinted locus to detect fetal epigenetic markers in maternal plasma.
  • Developed a novel universal fetal epigenetic marker: hypomethylated maspin.
  • Focused on epigenetic rather than genetic markers for broader applicability.

Main Results:

  • Successfully identified the first universal fetal epigenetic marker, hypomethylated maspin.
  • Demonstrated its utility for fetal DNA detection in maternal plasma.
  • Established a method independent of fetal gender and genetic variations.

Conclusions:

  • Hypomethylated maspin represents a significant advancement in noninvasive prenatal diagnosis.
  • The development of universal fetal epigenetic markers is expected to accelerate.
  • These markers hold promise for widespread clinical use, including aneuploidy detection.