荧光原位杂交技术在检测胎儿染色体亚显微结构异常中的应用

目的探讨荧光原位杂交(FISH)技术在诊断培养后的羊水细胞染色体亚显微结构异常中的应用价值。方法对1例18孕周,经典细胞遗传学羊水染色体核型分析结果与B超检查结果有不符合的胎儿,应用FISH的18号、X、Y染色体着丝粒探针和13、21号染色体位点特异性探针,对培养后的羊水中期细胞标本进行检测。结果共分析了22个独立细胞克隆的分裂象,发现胎儿染色体存在两种核型嵌合,结果记为:mos45,X20]/46,XY2];FISH检测发现此胎儿核型存在Y染色体亚显微小片段易位。结论 FISH技术结合传统细胞遗传学核型分析,对于诊断染色体亚显微结构异常非常重要。

Application of the fluorescent in situ hybridization(FISH) on the prenatal diagnosis of the subtle chromosomal aberrations

Objective To study the diagnostic value of the fluorescent in situ hybridization on detection of subtle chromosomal aberrations in cultured amniotic fluid cells. Methods Amniocenteses were performed in a pregnant women of 18 gestational weeks, and metaphase FISH was followed because the results of amniotic fluid karyotype and ultrasound were disagree with each other. The metaphase chromosomes were hybridized in situ with the human centromere probes of chromosome 18,X,Y and site specific probe of chromosome 13,21. The treated slides were examined and taken photos under the carl zeiss fluoromicroscope. Result Subtle translocation of chromosome Y was detected by FISH. Conclusion Our result indicated that it is very helpful for the diagnosis of subtle chromosomal aberrations by combining FISH with traditional karyotype analysis.