Combined Count- and Size-Based Analysis of Maternal Plasma DNA for Noninvasive Prenatal Detection of Fetal Subchromosomal Aberrations Facilitates Elucidation of the Fetal and/or Maternal Origin of the Aberrations
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AbstractBackground: Noninvasive prenatal detection of fetal subchromosomal copy number aberrations (CNAs) can be achieved through massively parallel sequencing of maternal plasma DNA. However, when a mother herself is a carrier of a CNA, one cannot discern if her fetus has inherited the CNA. In addition, false-positive results would become more prevalent when more subchromosomal regions are analyzed.

Methods: We used a strategy that combined count- and size-based analyses of maternal plasma DNA for the detection of fetal subchromosomal CNAs in 7 target regions for 10 test cases.

Results: For the 5 cases in which CNAs were present only in the fetus, the size-based approach confirmed the aberrations detected by the count-based approach. For the 5 cases in which the mother herself carried an aberration, we successfully deduced that 3 of the fetuses had inherited the aberrations and that the other 2 fetuses had not inherited the aberrations. No false positives were observed in this cohort.

Conclusions: Combined count- and size-based analysis of maternal plasma DNA permits the noninvasive elucidation of whether a fetus has inherited a CNA from its mother who herself is a carrier of the CNA. This strategy has the potential to improve the diagnostic specificity of noninvasive prenatal testing.
All Author(s) ListYu SCY, Jiang PY, Chan KCA, Faas BHW, Choy KW, Leung WC, Leung TY, Lo YMD, Chiu RWK
Journal nameClinical Chemistry
Year2017
Month1
Volume Number63
Issue Number2
PublisherAmerican Association for Clinical Chemistry
ISSN0009-9147
eISSN1530-8561
LanguagesEnglish-United Kingdom
Keywordshttp://clinchem.aaccjnls.org/content/63/2/495

Last updated on 2020-01-06 at 01:04