Abstract:Objective To explore the cause of the decrease in the accuracy of NIPT for SCAs detection through tracking and analyzing the high risk cases of sex chromosomal aneuploidy (SCAs) by noninvasive prenatal DNA testing (NIPT).Methods Three individuals detected by NIPT showed with high risk of SCAs, maternal peripheral blood and amniotic fluid of the three individuals were detected by traditional karyotype analysis, large scale parallel genome sequencing and chromosomal microarray detection.Results The chromosome karyotype of fetal chromosomes was not consistent between NIPT testing and traditional karyotype analysis as well as chromosomal microarray detection. The chromosome analysis of the three fetuses was 46,XN which indicated normal karyotype while their mothers presented abnormal or mosaicism.ConclusionThe abnormal X chromosome of mother was a potential cause of the inconsistency between NIPT and fetal chromosome karyotype analysis. It suggested that there is a high risk of chromosome aneuploidy in noninvasive prenatal DNA, and it is necessary to consider whether there is an abnormal or chimerism on the mother's chromosome. It should be tracked and analyzed by a variety of different molecular genetic techniques.
王杰, 郭志远, 冀云鹏, 朱博, 侯丽青, 周燕, 王晓华. 母体X染色体异常对无创产前DNA性染色体非整倍检测结果的影响分析[J]. 中国生育健康杂志, 2018, 29(6): 533-535.
WANG Jie, GUO Zhiyuan, JI Yunpeng, ZHU Bo, HOU Liqing, ZHOU Yan, WANG Xiaohua. Effect of maternal X chromosome abnormality on the detection of noninvasive prenatal DNA chromosome aneuploidy. Chinese Journal of Reproductive Health, 2018, 29(6): 533-535.
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