Abstract
The discovery of cell-free fetal DNA in the maternal plasma of pregnant women has facilitated the development of non-invasive prenatal diagnosis (NIPD). This has been successfully implemented in diagnostic laboratories for Rhesus typing and fetal sex determination for X-linked disorders and congenital adrenal hyperplasia (CAH) from 7 weeks gestation. Using real-time PCR, fluorescently labelled target gene specific probes can identify and quantify low copy number fetal-specific sequences in a high background of maternal DNA in the cell-free DNA extracted from maternal plasma.
NIPD to detect specific fetal mutations in single gene disorders, currently by standard PCR techniques, can only be undertaken for paternally derived or de novo mutations because of the background maternal DNA. For routine use, this testing is limited by the large amounts of cell-free maternal DNA in the sample, the lack of universal fetal markers, and appropriate reference materials.
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Acknowledgments
Dr Kirsten Finning for her guidance in setting up the real time PCR analysis. Bhaneeta Mistry and Lighta Godinho for technical assistance.
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© 2011 Humana Press
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Meaney, C., Norbury, G. (2011). Non-invasive Prenatal Diagnosis. In: Theophilus, B., Rapley, R. (eds) PCR Mutation Detection Protocols. Methods in Molecular Biology, vol 688. Humana Press. https://doi.org/10.1007/978-1-60761-947-5_11
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DOI: https://doi.org/10.1007/978-1-60761-947-5_11
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