Non‐invasive prenatal diagnostic testing for β‐thalassaemia using cell‐free fetal DNA and next generation sequencing. (29th December 2014)

• Record Type: Journal Article
• Authors: Xiong, Li; Barrett, Angela N.; Hua, Rui; Tan, Tuan Zea; Ho, Sherry Sze Yee; Chan, Jerry K. Y.; Zhong, Mei; Choolani, Mahesh
• Is Part Of: Prenatal diagnosis. Volume 35:Number 3(2015:Mar.)
• Page Start: 258
• Page End: 265
• Publication Date: 2014-12-29
• Subjects: Prenatal diagnosis -- Periodicals; Fetus -- Diseases -- Diagnosis -- Periodicals; Electronic journals; 618.32075
• DOI: 10.1002/pd.4536
• Languages: English
• ISSNs: 0197-3851

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="pd4536-sec-0001" sec-type="section"> <title>Objective</title> <p>To develop an accurate non‐invasive prenatal test using next generation sequencing (NGS) for HbE and the four most common β‐thalassaemia mutations found in South East Asia (namely −28A > G, CD17A > T, CD41/42(−TTCT) and IVS‐II‐654C > T).</p> </sec> <sec id="pd4536-sec-0002" sec-type="section"> <title>Methods</title> <p>Cell‐free DNA was extracted from maternal plasma from 83 families where both parents were carriers of the HbE mutation or one of four common β‐thalassaemia mutations. Overlapping PCR amplicons covering each mutation were generated, pooled and sequenced using the Illumina MiSeq. Fastq files were analysed to detect inheritance of the paternal mutation.</p> </sec> <sec id="pd4536-sec-0003" sec-type="section"> <title>Results</title> <p>In two cases where the fathers were compound heterozygotes for HbE and −28A > G, the fetus was correctly diagnosed as having inherited one of the paternal mutations. In 35/85 cases, the paternal mutation was not detected, and in 50/85 cases, it was classified as inherited. Overall sensitivity for detection of paternal mutations was 100% (95% CI: 92.4–100%), and specificity was 92.1% (95% CI: 79.2–97.3%).</p> </sec> <sec id="pd4536-sec-0004" sec-type="section"> <title>Conclusion</title> <p>We demonstrated that detection of paternal mutations using NGS can be readily achieved with high sensitivity and specificity, removing the need for an invasive test in 50% of pregnancies at risk of a thalassaemia in cases where the father and mother carry a different mutation. © 2014 John Wiley & Sons, Ltd.</p> </sec> </abstract>