Author:
Yin Ai-hua,Peng Chun-fang,Zhao Xin,Caughey Bennett A.,Yang Jie-xia,Liu Jian,Huang Wei-wei,Liu Chang,Luo Dong-hong,Liu Hai-liang,Chen Yang-yi,Wu Jing,Hou Rui,Zhang Mindy,Ai Michael,Zheng Lianghong,Xue Rachel Q.,Mai Ming-qin,Guo Fang-fang,Qi Yi-ming,Wang Dong-mei,Krawczyk Michal,Zhang Daniel,Wang Yu-nan,Huang Quan-fei,Karin Michael,Zhang Kang
Abstract
Noninvasive prenatal testing (NIPT) using sequencing of fetal cell-free DNA from maternal plasma has enabled accurate prenatal diagnosis of aneuploidy and become increasingly accepted in clinical practice. We investigated whether NIPT using semiconductor sequencing platform (SSP) could reliably detect subchromosomal deletions/duplications in women carrying high-risk fetuses. We first showed that increasing concentration of abnormal DNA and sequencing depth improved detection. Subsequently, we analyzed plasma from 1,456 pregnant women to develop a method for estimating fetal DNA concentration based on the size distribution of DNA fragments. Finally, we collected plasma from 1,476 pregnant women with fetal structural abnormalities detected on ultrasound who also underwent an invasive diagnostic procedure. We used SSP of maternal plasma DNA to detect subchromosomal abnormalities and validated our results with array comparative genomic hybridization (aCGH). With 3.5 million reads, SSP detected 56 of 78 (71.8%) subchromosomal abnormalities detected by aCGH. With increased sequencing depth up to 10 million reads and restriction of the size of abnormalities to more than 1 Mb, sensitivity improved to 69 of 73 (94.5%). Of 55 false-positive samples, 35 were caused by deletions/duplications present in maternal DNA, indicating the necessity of a validation test to exclude maternal karyotype abnormalities. This study shows that detection of fetal subchromosomal abnormalities is a viable extension of NIPT based on SSP. Although we focused on the application of cell-free DNA sequencing for NIPT, we believe that this method has broader applications for genetic diagnosis, such as analysis of circulating tumor DNA for detection of cancer.
Funder
National Science Foundation for Young Scholars of China
Publisher
Proceedings of the National Academy of Sciences
Cited by
95 articles.
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