title: Re-analysis of aneuploidy blastocysts with an inner cell mass and different regional trophectoderm cells.
abstract: OBJECTIVE
  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.
authors.affiliation: Reproductive Medical Centre, Department of Obstetrics and Gynecology, Peking University Third Hospital, 49 Huayuan North Rd, Haidian, Beijing, China.|Key Laboratory of Assisted Reproduction, Ministry of Education and Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing, 100191, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Huang
authors.affiliation: Reproductive Medical Centre, Department of Obstetrics and Gynecology, Peking University Third Hospital, 49 Huayuan North Rd, Haidian, Beijing, China.|Key Laboratory of Assisted Reproduction, Ministry of Education and Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing, 100191, China.
authors.forename: Liying
authors.initials: L
authors.lastname: Yan
authors.affiliation: Yikon Genomics, Beijing, China.
authors.forename: Sijia
authors.initials: S
authors.lastname: Lu
authors.affiliation: Reproductive Medical Centre, Department of Obstetrics and Gynecology, Peking University Third Hospital, 49 Huayuan North Rd, Haidian, Beijing, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhao
authors.affiliation: Reproductive Medical Centre, Department of Obstetrics and Gynecology, Peking University Third Hospital, 49 Huayuan North Rd, Haidian, Beijing, China. jie.qiao@263.net.|Key Laboratory of Assisted Reproduction, Ministry of Education and Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing, 100191, China. jie.qiao@263.net.
authors.forename: Jie
authors.initials: J
authors.lastname: Qiao
mesh_terms: D000782:Aneuploidy; D001706:Biopsy; D001755:Blastocyst / Q000378:metabolism*; D053624:Blastocyst Inner Cell Mass / Q000378:metabolism*; D055028:Comparative Genomic Hybridization; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods; D006801:Humans; D009030:Mosaicism; D011247:Pregnancy; D019836:Preimplantation Diagnosis
keywords: 24-chromosome aneuploidy screening; Blastocyst; Mosaic; Multiple annealing and looping-based amplification cycle sequencing; Preimplantation genetic screening