摘要目的：探讨基于Ion Proton半导体测序平台的无创基因检测技术应用于产前诊断的可行性。方法选取2013年1至12月在郑州大学第三附属医院产检的孕龄12～32周的1000例单胎妊娠孕妇为研究对象，采用Ion Proton半导体测序平台的无创产前基因检测技术对其外周血游离胎儿DNA进行分析，其中72例行羊膜腔穿刺技术进行确诊。结果1000份标本中，染色体非整倍体高风险18例（1．8％），其中7例21-三体，4例18-三体，2例13-三体，4例性染色体异常及1例15-三体。72例孕妇经羊水穿刺确诊，胎儿21-三体、18-三体和13-三体的无创产前检出率及正确率均为100％，误诊率均为0；性染色体异常的检出率为2／2，假阳性率为1／3，1例15-三体高风险孕妇经核型确诊为假阳性。经55例核型分析和493例随访研究，该方法检测21-三体、18-三体和13-三体的特异度均为100％。采用Ion PITM芯片每次可检测12～15份标本，上机测序时间为1．5 h，整个无创检测流程为1～1．5 d。结论利用基于Ion Proton高通量测序平台的无创产前基因检测技术可快速、准确地检测出胎儿染色体非整倍体异常，该平台检测速度快、无须积累大样本量进行上机，为将来临床规范化独立开展无创性基因检测筛查胎儿染色体非整倍体异常疾病奠定了基础。

abstractsObjective To evaluate the feasibility of apply Ion Proton semiconductor sequencing platform in non-invasive prenatal genetic diagnosis .Methods Totally 1 000 pregnant women with a singleton pregnancy of 12-32 weeks gestation were selected from the Third affiliated Hospital of Zhengzhou University from Jan to Dec 2013.Using noninvasive prenatal genetic diagnosis based on Ion Proton semiconductor sequencing platform to study their cffDNA .In parallel, 72 pregnant women received invasive prenatal diagnosis by traditional chromosomal analysis with amniocentesis chorionic villus sampling .Results It′s shown that 18 out of 1 000 (1.8%) pregnant women underwent the noninvasive prenatal genetic testing had a high risk for aneuploid chromosomes , including 7 cases of 21-trisomy, 4 cases of 18-trisomy, 2 cases of 13-trisomy, 4 cases of sex chromosomal abnormality , and 1 case of 15-trisomy.It demonstrated that the rate and accuracy of fetal 21-trisomy, 13-trisomy and 18-trisomy by non-invasive prenatal genetic testing were both 100%without misdiagnosis , the rate of detection for sex chromosomal abnormality was 2/2 with a false positive rate of 1/3.However, the 15-trisomy predicted by the non-invasive prenatal diagnosis in a woman was finally proved to be a false positive .Based on the results by karyotyping (55/55) as well as follow-ups (493/493), the specificity of the non-invasive prenatal diagnosis for detection of 21-trisomy, 18-trisomy and 13-trisomy was 100%.One Ion PITM chip could detect 12 to 15 samples in 1.5 h and the whole process of noninvasive detection could be completed in 1 to 1.5 days.Conclusions The non-invasive prenatal diagnosis by Ion Proton semiconductor sequencing platform could provide fast and accurate detection of fetal aneuploidy .The benchtop high-throughput sequencing platform has laid the foundation for the independent application in clinical settings for fetal aneuploidy detection .