摘要
目的探索从孕妇外周血浆中提取小片段游离胎儿DNA(cffDNA)提高检测胎儿Y染色体性别决定区(SRY)基因准确率的方法,评估利用小片段cffDNA进行无创性产前诊断可行性。方法收集117例孕妇外周血,利用柱吸收方法提取其血浆cffDNA,经琼脂糖凝胶电泳分离富集小片段cffDNA,使用二重PCR反应(dulex-PCR)检测SRY基因和磷酸甘油醛脱氢酶(GAPDH)基因。结果来源于66例孕男胎孕妇血浆标本小片段cffDNA均检出SRY和GAPDH基因,来源于50例孕女胎孕妇血浆标本小片段cffDNA仅检出GAPDH基因。与绒毛/羊水标本检测结果相符。特异性和敏感性均为100%。结论利用琼脂糖凝胶电泳,切胶回收,可选择性富集孕妇外周血小片段cffDNA,相对提高胎儿DNA水平,结合二重PCR扩增SRY基因技术可用于无创性产前性连锁遗传疾病和单基因突变疾病产前诊断。
Objective To evaluate the feasibility of cell free fetal DNA（cffDNA）-based noninvasive prenatal diagnosis,we developed a precise technique for fetal sex determining region of Y chromosome（SRY）gene detection using size-fractionated cell-free DNA in maternal plasma.Methods Peripheral blood samples were collected form 117 pregnant women.cffDNA was extracted based on a column absorbent method and isolated by agarose gel electrophoresis.A dulex-polymerase chain reaction（PCR）was used to detected SRY gene and glycerol-dehyde-phosphate dehydrogenase（GAPDH）gene.Results Both SRY and GAPDH gene were detected in 86 cffDNA samples from women bearing male fetuses.And only GAPDH gene was detected in 71 cffDNA samples from women bearing female fetuses.These results had a coincidence whit those of villus or amniotic fluid samples.The specificity and sensitivity reached 100%（117/117）and 100%（66/66）,respectively.Conclusion By agarose gel electrophoresis,re-extratedand and dulex PCR,size-fractionated cell-free fetal DNA in maternal plasma can be selective enriched and used to noninvasive prenatal diagnosis of sex-linked disorders and single gene disorders.
出处
《实用儿科临床杂志》
CAS
CSCD
北大核心
2007年第17期1335-1337,共3页
Journal of Applied Clinical Pediatrics
基金
广西科学基金项目资助(桂科自0447056)
广西壮族自治区科学研究与技术开发计划项目资助(桂科攻0015042)
