检验医学 ›› 2023, Vol. 38 ›› Issue (8): 730-737.DOI: 10.3969/j.issn.1673-8640.2023.08.005

• 论著 • 上一篇    下一篇

扩展性无创产前筛查技术在染色体拷贝数变异检测中的临床应用效果评价

冯暄, 张庆华, 王兴, 何静, 梁济慈, 贾春暘, 蔺朋武, 朱韶华, 郝胜菊()   

  1. 甘肃省医学遗传中心 甘肃省出生缺陷与罕见病临床研究中心 甘肃省妇幼保健院,甘肃 兰州 730050
  • 收稿日期:2022-06-04 修回日期:2022-08-03 出版日期:2023-08-30 发布日期:2023-10-30
  • 通讯作者: 郝胜菊,E-mail:haosj165@163.com
  • 作者简介:冯暄,女,1983年生,硕士,主管检验师,主要从事分子遗传学检验工作。
  • 基金资助:
    甘肃省出生缺陷与罕见病临床医学研究中心基金项目(21JR7RA680);兰州市科技计划资助项目(2017-4-50);甘肃省妇幼保健院重大攻关项目(2021)

Evaluation of clinical application of expanded non-invasive prenatal testing for chromosome copy number variation

FENG Xuan, ZHANG Qinghua, WANG Xing, HE Jing, LIANG Jici, JIA Chunyang, LIN Pengwu, ZHU Shaohua, HAO Shengju()   

  1. Gansu Medical Genetics Center,Gansu Provincial Clinical Research Center of Birth Defects and Rare Diseases,Gansu Maternal and Child Health Hospital,Lanzhou 730050,Gansu,China
  • Received:2022-06-04 Revised:2022-08-03 Online:2023-08-30 Published:2023-10-30

摘要:

目的 探讨扩展性无创产前筛查技术(NIPT-plus)在染色体拷贝数变异(微缺失/微重复)检测中的应用价值。方法 选取2017—2018年在甘肃省妇幼保健院医学遗传中心进行NIPT-plus检测的孕妇10 187例,采用NIPT-plus检测孕妇血浆胎儿游离DNA(cffDNA)。对NIPT-plus检测为高风险的孕妇采用羊水染色体核型分析或低深度全基因组测序(CNV-seq)确诊,并随访至引产或分娩后3个月。结果 采用NIPT-plus在10 187例孕妇中筛查出164例高风险孕妇,其中131例为染色体非整倍体异常、33例为染色体微缺失/微重复。164例NIPT-plus高风险孕妇中,有131例接受CNV-seq检测,共确诊59例,其中染色体非整倍体异常46例、染色体微缺失/微重复13例,假阳性72例。NIPT-plus筛查5~10 Mb缺失/重复的阳性预测值、敏感性和特异性均为100.00%;筛查>10 Mb的缺失/重复的阳性预测值为62.50%,敏感性为100.00%,特异性为99.97%;筛查<5 Mb的缺失/重复的阳性预测值为42.86%,敏感性为90.00%,特异性为99.88%。结论 NIPT-plus对≥5 Mb的染色体缺失/重复的检出率较高,对<5 Mb的染色体微缺失/微重复的阳性预测值较低,应进一步提高NIPT-plus对于染色体微缺失/微重复的检测性能。

关键词: 扩展性无创产前筛查技术, 染色体拷贝数变异, 低深度全基因组测序

Abstract:

Objective To investigate the application role of expanded non-invasive prenatal testing(NIPT-plus) in the determination of chromosome copy number variation(microdeletion or microduplication). Methods A total of 10 187 pregnant women who underwent NIPT-plus were enrolled from the Genetics Center of Gansu Maternal and Child Health Hospital form 2017 to 2018. NIPT-plus was used to determine cell-free fetal DNA(cffDNA) in the plasma of pregnant women. The high-risk pregnant women in NIPT-plus were diagnosed by amniotic fluid karyotyping and copy number variation sequencing(CNV-seq) and were followed up until fetal induction or 3 months after birth. Results Among the 10 187 pregnant women,164 high-risk pregnant women were screened,of which 131 cases were at high risk for chromosome aneuploidy,and 33 cases were at high risk for chromosome microdeletion or microduplication. Totally,131 cases of 164 high-risk pregnant women received CNV-seq,and 59 positive cases were confirmed,including 46 cases of chromosome aneuploidy,13 cases of chromosome microdeletion or microduplication and 72 cases of false positivity. The positive predictive value,sensitivity and specificity of 5-10 Mb deletion or duplication for NIPT-plus were 100.00%. The positive predictive value,sensitivity and specificity of >10 Mb deletion or duplication were 62.50%,100.00% and 99.97%,respectively. The positive predictive value,sensitivity and specificity of <5 Mb deletion or duplication were 42.86%,90.00% and 99.88%,respectively. Conclusions The determination rate of NIPT-plus for chromosome deletion or duplication ≥5 Mb is high,and the positive predictive value for chromosome microdeletion or microduplication <5 Mb is low. The performance of NIPT-plus in chromosome microdeletion or microduplication should be further improved.

Key words: Expanded non-invasive prenatal testing, Chromosome copy number variation, Copy number variation sequencing

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