短重复序列在妊娠早期苯丙酮尿症产前诊断中的应用

目的:在妊娠早期寻找一种简便、快速的苯丙酮尿症(PKU)产前诊断方法,尽可能早地防止苯丙酮尿症患儿的出生。方法:分别从来自9个经典型苯丙酮尿症家庭成员的外周血和9个胚胎的绒毛组织中提取DNA(采用绒毛取材法吸取绒毛组织)。通过分析家庭成员独立的短重复序列(STR)等位基因,并利用多聚酶链反应(PCR)和变性凝胶电泳(DGGE)结合银染色对这9个家庭的胚胎进行产前诊断。结果:9个胚胎中,1例为PKU,2例为正常胚胎,5例为携带者。结论:在妊娠早期应用STR分析可进行苯丙酮尿症的产前诊断是切实可行的。这种方法在中国人群中具有广阔的应用前景。

Application of Short Tandem Repeat in Prenatal Diagnosis for Phenylketonuria during the First Trimester

Objective : To find a simple and rapid way far the prenatal diagnosis of phenyUce-tonuria (PKU) during the first trimester in order to prevent inborn PKU patients as early as possible. Methods :DNA was extracted respectively from the Mood sampleps of 9 families' members and chori-onic tissues of 9 embryoes by cliorionic vittus sampling (CVS). The independent short tandem repeat (STR) alleles of members in 9 families with classic form of PKU were analyzed and prenatal diagnosis were conducted using polymerase chain reaction (PCR) together with denaturing gradient gel elec-trophoresis(DGGE)and silver dyeing. Results-.We identified 1 embryo with PKU, 2 normal individuals and 5 carriers among 9 subjects. Conclusion: Prenatal diagnosis for PKU by STR is available in the first trimester. This procedure was promising and would be widely used in Chinese population.