PCR技术检测孕妇外周血中胎儿细胞的研究

根据Ｙ染色体序列特点，含有Ｙ染色体特异重复ＤＮＡ族（ＤＹＺ１）８００～５０００拷贝、新设计一对引物Ｙ３、Ｙ４经聚合酶链反应（ＰＣＲ）扩增该序列的特定片段，来检测孕妇血中胎儿细胞。作者用此方法扩增各妊娠早、中、晚孕妇外周血标本粗提ＤＮＡ，检测男性胎儿细胞，与相应的绒毛、羊水及娩出胎儿性别相比较，符合率分别为９３％、１００％、８７．５％。本研究为无创伤性产前诊断提供了新的途径。

Detection of Fetal Cells in Maternal Peripheral Blood by Polymerase Chain Reaction

According to that Y-chromosomal sequence in characterised by Y-specific repeat DNA family (DYZ1 ), which contain 800-5000 copies, a pair of primers Y3, Y4 is designed to amplify their 446bp long of specific DNA segment by polymerase chain reaction (PCR), so as to detect male fetal cells in materal blood. In this paper male fetal cells in maternal blood can be detected by PCR amplification of unpurified DNA from maternal peripheral blood during various stages of gestation (early, middle, late). Compared with villi, ammotic fluid and deliverd neonate sex their coincident rate are 93%. 100%, 87. 5% respectively among three periods. It is revealed that noninvasive examining fetal cells from peripheral blood of pregnant women for diagnosis of sex-linked inherited diseases is significant valuable.