Assessment of aneuploidy formation in human blastocysts resulting from cryopreserved donor eggs

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• 作者：Aimin Deng (1)
  Wei-Hua Wang (2) (3)
  
  1. Center for Reproductive Medicine ; Changsha Hospital for Maternal and Child Health Care ; No. 416 ; Chengnan East Road ; Changsha City ; Hunan ; China
  2. Houston Fertility Laboratory ; Vivere Health ; Houston ; TX ; USA
  3. Houston Fertility Institute ; 2500 Fondren Road ; Suite 350 ; Houston ; TX ; 77063 ; USA
  
• 关键词：Aneuploidy ; Egg freezing ; Donor eggs ; Implantation
• 刊名：Molecular Cytogenetics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：8
• 期：1
• 全文大小：1,505 KB
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• 刊物主题：Cytogenetics; Molecular Medicine;
• 出版者：BioMed Central
• ISSN：1755-8166

文摘

Background Increased embryo implantation rates were reported after transfer of euploid embryos selected by preimplantation genetic screening (PGS). Egg cryopreservation by vitrification has become one of the most important assisted human reproduction technologies. Although reports indicate that development and implantation of human embryos derived from frozen donor eggs are comparative to fresh eggs, it is still unknown whether egg vitrification increases chromosomal abnormalities in eggs, which in turn causes formation of embryonic aneuploidy. Therefore, in this study, we evaluated the aneuploidy formation in the blastocysts derived from frozen donor eggs and also evaluated the efficiency of egg vitrification as an advanced technology for egg cryopreservation. Results In this study, donated human eggs from young women were cryopreserved by vitrification and PGS was performed in the resulted blastocysts by DNA microarray. A total of 764 frozen eggs from 75 egg thawing cycles were warmed and 38 blastocysts were biopsied for PGS before embryo transfer. A 97.1% of egg survival rate was obtained and 59.1% of embryos developed to blastocyst stage. After biopsy and PGS, it was found that 84.2% of blastocysts were euploid and 15.8% were aneuploid. Aneuploidy rates varied among donors. Transfers of blastocysts without PGS resulted in higher clinical pregnancy and implantation rates as compared with transfer of blastocysts with PGS. Conclusions Although the overall aneuploidy rate was low in the blastocysts derived from frozen donor eggs, high aneuploidy rates were observed in the embryos resulting from some donated eggs. Clinical pregnancy rate was not improved by PGS of embryos resulting from donor eggs, indicating that PGS may not be necessary for embryos derived from donor eggs in most cases.