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- W3162283252 abstract "To determine whether blastocyst morphology has an impact on sex proportion at pre-implantation and birth in PGT-A and non-PGT-A cycles.A total of 1254 biopsied blastocysts from 466 PGT-A cycles were analyzed for sex proportion, day of biopsy, degree of expansion, inner cell mass (ICM), and trophectoderm (TE) morphology. From these, 197 frozen single embryo transfers (SET) were assessed for clinical outcomes and sex proportion of ongoing pregnancies and deliveries. In addition, we evaluated the day of vitrification/embryo transfer, degree of expansion, and TE morphology in a group of 229 births (217 cycles) from frozen or fresh transfers of non-biopsied blastocysts.Sex proportion was impacted by day of biopsy and TE morphology, but not by ICM morphology, in PGT-A cycles. Therefore, biopsy on day 5 and TE A shifted the sex proportion towards males. Interestingly, we noted that our morphology-based embryo selection for SET of euploid blastocysts has favored the choice for XY embryos, generating a 54.3% XY proportion at transfer and 56.1% XY proportion at ongoing pregnancy/delivery. Our models indicate a weaker association between blastocyst morphology parameters and sex proportion of babies in non-PGT-A cycles.Blastocyst features associated with a skewed sex proportion towards XY embryos, such as biopsy on day 5 and top quality TE, are also parameters used for selecting euploid embryos for SET. Therefore, our data suggest that morphology-based embryo selection represents a strong factor responsible for a skewed male sex proportion at birth in PGT-A cycles." @default.
- W3162283252 created "2021-05-24" @default.
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- W3162283252 date "2021-05-19" @default.
- W3162283252 modified "2023-10-18" @default.
- W3162283252 title "Morphology-based selection from available euploid blastocysts induces male-skewed sex proportion in the offspring" @default.
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- W3162283252 doi "https://doi.org/10.1007/s10815-021-02235-9" @default.
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