PGD 不同位置(12, 3, 6點鐘方位)之TE細胞染色體與ICM染色體呈現鑲嵌化之比率無統計差異
不同位置(12, 3, 6點鐘方位)之TE細胞染色體間鑲嵌化之比率可能高達13% (7/51)
TE細胞染色體與ICM細胞染色體鑲嵌化之比率可能高達15% (8/51)
結論:
囊胚期PGD染色體若只做單一切片之準確性可能只達8-90%
囊胚期PGD染色體若做三位置一切片之準確性可能只達98%
但實務上是不可能做到3位置之切片(只做3點鐘方位之切片)
Re-analysis of aneuploidy blastocysts with an inner cell mass and different regional trophectoderm cells.
Abstract
PURPOSE:
The purpose of this study is to explore which part of the trophectoderm best represents the inner cell mass after aCGH analysis.
METHODS:
Fifty-one preimplantation genetic diagnosis/preimplantation genetic screening of abnormal blastocysts diagnosed by array comparative genomic hybridization were included in this study. Blastocysts were thawed, incubated for 3 to 4 h, and then biopsied. Four regions were biopsied per blastocyst, including the inner cell mass (ICM), trophectoderm (TE) cells opposite the ICM, TE cells at the upper right of the ICM, and TE cells at the lower right of the ICM. The biopsied pieces were processed through multiple annealing and looping-based amplification cycle sequenced for 24-chromosome aneuploidy screening. The aneuploidy results were compared among the ICM and the different regional trophectoderm cells from the same blastocyst.
RESULTS:
Fifty of 51 (98.04%) ICM samples were concordant with at least one of the TE biopsies derived from the same embryos. There were 43 blastocysts in which ICM and the other three TE pieces were consistent. Discordance among the four pieces occurred in eight blastocysts. Only one blastocyst was discordant between the ICM and the other three TE pieces, while seven blastocysts were discordant between one of TE and the other three biopsied pieces. There was no special region that the mosaic TE was located.
CONCLUSIONS:
Our findings indicate that TE aneuploidy is an excellent predictor of ICM aneuploidy. The blastocyst mosaic cells are inclined to be located in TE. Moreover, the mosaic TE was not limited to the special region.
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