Preimplantation genetic screening reveals a high incidence of aneuploidy and mosaicism in embryos from young women undergoing IVF

被引:216
作者
Baart, EB
Martini, E
van den Berg, I
Macklon, NS
Galjaard, RJH
Fauser, BCJM
Van Opstal, D
机构
[1] Univ Rotterdam, Erasmus MC, Med Ctr, Dept Obstet & Gynaecol,Div Reprod Med, NL-3015 GD Rotterdam, Netherlands
[2] Univ Rotterdam, Erasmus MC, Med Ctr, Dept Clin Genet, NL-3015 GD Rotterdam, Netherlands
[3] Univ Utrecht, Med Ctr, Dept Reprod Med, NL-3584 CX Utrecht, Netherlands
关键词
aneuploidy; chromosomal mosaicism; confirmation of diagnosis; human preimplantation embryos; preimplantation genetic screening;
D O I
10.1093/humrep/dei291
中图分类号
R71 [妇产科学];
学科分类号
100211 ;
摘要
BACKGROUND: In order to assess the frequency of aneuploidy and mosaicism in embryos obtained from IVF patients aged < 38 years, preimplantation genetic screening (PGS) was performed after biopsy of two blastomeres. Furthermore, the reliability of this diagnosis was assessed by performing reanalysis of the embryo on day 5. METHOD: The copy numbers of 10 chromosomes (1, 7, 13, 15, 16, 18, 21, 22, X and Y) were investigated by fluorescence in situ hybridization (FISH) analysis. Embryos that were found to be abnormal or of insufficient morphological quality were cultured until day 5 and reanalysed. Results obtained were compared to the day 3 blastomere analysis. RESULTS: After analysis of 196 embryos (one cell in 38% and two cells in 62%), only 36% of the embryos were found to be normal on day 3. After analysis of two blastomeres, 50% showed chromosomal mosaicism. Comparison of the FISH results from day 3 blastomeres and day 5 embryos yielded an overall cytogenetic confirmation rate of 54%. CONCLUSIONS: The rates of mosaicism and aneuploidy in these embryos from young IVF patients are similar to those published for older women. We found the best confirmation rate after a diagnosis based on two cells, where both blastomeres showed the same chromosomal abnormality. In contrast, after a mosaic diagnosis the confirmation rate was low. The present study provides the first detailed reanalysis data of embryos analysed by PGS and clearly demonstrates the impact of mosaicism on the reliability of the PGS diagnosis.
引用
收藏
页码:223 / 233
页数:11
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