Maternal Plasma DNA Testing for Aneuploidy in Pregnancies Achieved by Assisted Reproductive Technologies

Genet Med. 2014 May;16(5):419-22. doi: 10.1038/gim.2013.149. Epub 2013 Oct 3.

Abstract

Purpose: We sought to compare measurements of circulating cell-free DNA as well as Down syndrome test results in women with naturally conceived pregnancies with those conceived using assisted reproductive technologies.

Methods: Data regarding assisted reproductive technologies were readily available from seven enrollment sites participating in an external clinical validation trial of nested case/control design. Measurements of circulating cell-free fetal and total DNA, fetal fraction (ratio of fetal to total DNA), chromosome-specific z-scores, and karyotype results were available for analysis.

Results: Analyses were restricted to 632 euploid (5.2% assisted reproductive technologies) and 73 Down syndrome (13.7% assisted reproductive technologies), including 16 twin pregnancies. No differences were found for fetal or total circulating cell-free DNA, or for the fetal fraction in euploid (P = 0.70) or Down syndrome (P = 0.58) pregnancies by method of conception. There appeared to be systematic z-score reductions for chromosomes 21, 18, and 13 in assisted reproductive technologies versus natural euploid pregnancies (P = 0.048, 0.0032, and 0.36, respectively).

Conclusion: Assisted reproductive technologies and naturally conceived pregnancies contribute similar levels of circulating cell-free DNA into maternal circulation. Small differences in the z-scores of pregnancies achieved by assisted reproductive technologies were observed and do not appear to be test-related artifacts. However, the findings need confirmation before any consideration of changes to testing and reporting protocols.

Publication types

  • Comparative Study

MeSH terms

  • Aneuploidy*
  • DNA / blood*
  • DNA / genetics
  • Down Syndrome / diagnosis
  • Down Syndrome / epidemiology*
  • Down Syndrome / genetics*
  • Female
  • Genetic Testing
  • Humans
  • Pregnancy
  • Reproductive Techniques, Assisted / adverse effects*

Substances

  • DNA