Abstract
Purpose
The purpose of the study was to explore the effect of blastomere biopsy for preimplantation genetic diagnosis (PGD) on the embryos’ dynamics, further cleavage, development, and implantation.
Methods
The study group included 366 embryos from all PGD treatments (September 2012 to June 2014) cultured in the EmbryoScope™ time-lapse monitoring system. The control group included all intracytoplasmic sperm injection (ICSI) embryos cultured in EmbryoScope™ until day 5 during the same time period (385 embryos). Time points of key embryonic events were analyzed with an EmbryoViewer™.
Results
Most (88 %) of the embryos were biopsied at ≥8 cells. These results summarize the further dynamic development of the largest cohort of biopsied embryos and demonstrate that blastomere biopsy of cleavage-stage embryos significantly delayed compaction and blastulation compared to the control non-biopsied embryos. This delay in preimplanation developmental events also affected postimplantation development as observed when the dynamics of non-implanted embryos (known implantation data (KID) negative) were compared to those of implanted embryos (KID positive).
Conclusion
Analysis of morphokinetic parameters enabled us to explore how blastomere biopsy interferes with the dynamic sequence of developmental events. Our results show that biopsy delays the compaction and the blastulation of the embryos, leading to a decrease in implantation.
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Acknowledgments
Embryologists Ariela Carmon, Shiri Asaf, Roni Rahav, and Alina Shpitz are thanked for embryo assessment and documentation. Dana Hadar Fruchter, statistical advisor, is thanked for statistical analysis; Sharon Cooper, statistical advisor, is thanked for descriptive statistics, Esther Eshkol for editorial assistance.
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Capsule Morphokinetic analysis demonstrated that blastomere biopsy interferes with the dynamic sequence of developmental events, delaying compaction and blastulation of the embryos and leading to a decrease in implantation rate.
This work was performed in partial fulfillment of the M.D. thesis requirements of the Sackler Faculty of Medicine, Tel Aviv University.
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Bar-El, L., Kalma, Y., Malcov, M. et al. Blastomere biopsy for PGD delays embryo compaction and blastulation: a time-lapse microscopic analysis. J Assist Reprod Genet 33, 1449–1457 (2016). https://doi.org/10.1007/s10815-016-0813-2
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DOI: https://doi.org/10.1007/s10815-016-0813-2