囊胚培养在植入前遗传学诊断中的价值

The value of blastocyst culture on preimplantation genetic diagnosis

目的 探讨囊胚培养在植入前遗传学诊断（preimplantation genetic diagnosis,PGD）中的应用价值.方法 受精后第3天（Day 3）行胚胎活检,进行荧光原位杂交（fluorescent in situ hybridization,FISH）.对于诊断为正常的胚胎,培养到囊胚阶段后选择形态评分优良的囊胚进行移植;对于诊断为异常的胚胎,有14个培养到囊胚阶段,各取其一部分细胞用于全基因组扩增（whole genomic amplification,WGA）,将扩增后的DNA用微阵列比较基因组杂交（array-based comparative genomic hybridization,arrayCGH）进行再次检测.结果 FISH诊断为正常的6个囊胚进行了5个周期的胚胎移植,3个周期成功生育了4个健康婴儿,1个周期单胎妊娠见胚囊后流产,绒毛染色体检测为正常核型.FISH诊断为异常的14个囊胚用array-CGH技术检测发现有6个为正常结果.结论 FISH检测结合囊胚培养后移植可能可以进一步保证PGD结果的准确性.囊胚培养后的检测可能能够避免Day 3检测假阳性结果或者嵌合的干扰,从而更真实的反映整体胚胎的情况.

Objective To estimate the value of blastocyst culture for preimplantation genetic diagnosis （PGD）.Methods Day 3 embryos were biopsied and analyzed with fluorescence in situ hybridization （FISH） technique.Embryos with normal FISH results were cultured into blastocysts,and the ones with better morphology scores were transferred.Fourteen embryos with abnormal FISH results were cultured into blastocysts.Part of the cells taken from the blastocysts were amplified by whole genomic amplification （WGA） and assessed by array-based comparative genomic hybridization （array-CGH） analysis.Results Six blastocysts with normal FISH results were transferred in 5 cycles.Four healthy babies of 3 cycles were delivered.Another one was a singleton pregnancy but with embryo growth arrest,whose villus karyotype was normal.Fourteen embryos with abnormal FISH results were cultured into blastocysts and analyzed by array-CGH.Six blastocysts were normal by array-CGH.Conclusion FISH combined with blastocyst culture may further ensure the accuracy of PGD result.Detection at the blastocyst stage can avoid false positive results and mosaic interferences on Day 3 stage and are therefore more authentic.