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Human embryonic development after blastomere removal: a time-lapse analysis
Hindkjaer, Johnny Juhl
Ingerslev, Hans Jakob
Article from Journal - ilmiah internasional
Human Reproduction vol. 27 no. 01 (Jan. 2012)
preimplantation genetic diagnosis
human embryo development
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BACKGROUND Blastomere biopsy of human embryos is performed for preimplantation genetic diagnosis (PGD). The impact on further development is largely unexplored, though studies on mice suggest an influence on the hatching process. The objective of this study was to evaluate the effect of blastomere biopsy on early human embryonic development using time-lapse analysis. METHODS Embryos from couples undergoing PGD treatment or IVF/ICSI were included. In the PGD group, 56 human embryos had one blastomere biopsied. As controls, 53 non-biopsied IVF/ICSI embryos were selected. All embryos were cultured until 5 days after fertilization in a time-lapse incubator (EmbryoScope™). Images of embryos were acquired every 20min. Time-points of key embryonic events were registered, and development in the two groups was compared. RESULTS Duration of the biopsied cell-stage in the PGD group was longer than in the control group (P < 0.001), causing biopsied embryos to reach subsequent embryonic stages until hatching at significantly later time-points (Pcompaction < 0.001; Pmorula < 0.001; Pearlyblast < 0.001; Pfullblast = 0.01), but with unchanged intervals. Embryos in the PGD group started hatching at the same time-point as the control group, but had a smaller diameter (P < 0.001), and a thicker zona pellucida (P < 0.001) when hatching. Time-lapse videos revealed that in the control group, expansion of the blastocyst caused continuous thinning of zona pellucida until the blastocyst hatched, whereas in the PGD group the blastocyst hatched through the opening in zona pellucida artificially introduced prior to the biopsy. CONCLUSIONS We find that blastomere biopsy prolongs the biopsied cell-stage, possibly caused by a delayed compaction and alters the mechanism of hatching.
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