Funding sources: This work is partly supported by the National Basic Research Program of China (2012CB944600) and the Hong Kong General Research Grant.
Secondary findings from non-invasive prenatal testing for common fetal aneuploidies by whole genome sequencing as a clinical service
Article first published online: 2 APR 2013
© 2013 John Wiley & Sons, Ltd.
Special Issue: Noninvasive Prenatal Testing Using Maternal Plasma DNA: Part I
Volume 33, Issue 6, pages 602–608, June 2013
How to Cite
Lau, T. K., Jiang, F. M., Stevenson, R. J., Lo, T. K., Chan, L. W., Chan, M. K., Lo, P. S. S., Wang, W., Zhang, H.-Y., Chen, F. and Choy, K. W. (2013), Secondary findings from non-invasive prenatal testing for common fetal aneuploidies by whole genome sequencing as a clinical service. Prenat. Diagn., 33: 602–608. doi: 10.1002/pd.4076
Conflicts of interest: The co-authors, Fuman Jiang, Mei Ki Chan, Hong-Yun Zhang, Fang Chen and Wei Wang are employees of BGI.
- Issue published online: 17 MAY 2013
- Article first published online: 2 APR 2013
- Manuscript Accepted: 1 FEB 2013
- Manuscript Revised: 28 JAN 2013
- Manuscript Received: 14 DEC 2012
To report secondary or additional findings arising from introduction of non-invasive prenatal testing (NIPT) for aneuploidy by whole genome sequencing as a clinical service.
Five cases with secondary findings were reviewed.
In Case 1, NIPT revealed a large duplication in chromosome 18p, which was supported by arrayCGH of amniocyte DNA, with final karyotype showing mosaic tetrasomy 18p. In Case 2, a deletion in the proximal long arm of chromosome 18 of maternal origin was suspected and confirmed by arrayCGH of maternal white cell DNA. In Case 3, NIPT was negative for trisomies 21 and 18. In-depth analysis for deletions/duplications was requested when fetal structural anomalies were detected at routine scan. A deletion in the proximal long arm of chromosome 3 was found and confirmed by karyotyping. In Case 4, NIPT correctly predicted confined placental mosaicism with triple trisomy involving chromosomes X, 7 and 21. In Case 5, NIPT correctly detected a previously unknown maternal mosaicism for 45X.
Non-invasive prenatal testing is able to detect a wide range of fetal, placental and maternal chromosomal abnormalities. This has important implications on patient counseling when an abnormality is detected by NIPT. © 2013 John Wiley & Sons, Ltd.