Preimplantation genetic testing for chromosomal screening is, at present, the most reliable method to assess the genetic status of preimplantation embryos. DNA isolated and amplified from trophectoderm (TE) biopsiesis the method currently used for preimplantation genetic testing, but it has significant limitations. There is increasing evidence for a ''true'' noninvasive approach consisting of the analysis of cell-free DNA (cfDNA) released by the embryo into the spent blastocyst medium (SBM) during the late stages of preimplantation development. This study is to assess whether Noninvasive prenatal genetic diagnosis using cell-free fetal DNA in spent culture medium will substitute for trophectoderm biopsy for heritable disorders screening and if it represents the total fetal genomic DNA. A total of 27 spent blastocyst media (SBM) from women undergoing IVF will be enrolled with agesless than44 years, whose indications for preimplantation genetic diagnosis for Euploid/Aneuploid embryo determination, were advanced maternal age, recurrent miscarriage, or recurrent implantation failure.We examined the presence of the cell free DNA in spent culture media and whether this DNA is reliable and can be representative of the chromosomal constitution of a blastocyst. So we can affirm that Noninvasive prenatal determination of fetal sex using cell-free fetal DNA (used here as a marker) provides an alternative to invasive techniques for some heritable disorders.
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Efficacy of cell free fetal DNA isolated from spent culture medium
Timeframe: At Day 5 of ICSI