1. Mosaic human preimplantation embryos and their developmental potential in a prospective, non-selection clinical trial
- Author
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Elena Albani, Matteo Figliuzzi, Marco Fabiani, Carmen Rubio, Maurizio Poli, Necati Findikli, Danilo Cimadomo, Cristina Patassini, Paolo E. Levi-Setti, Onder Coban, Alberto Vaiarelli, Antonio Capalbo, Filippo Maria Ubaldi, Laura Sacchi, Laura Rienzi, Alessio Farcomeni, Carlos Simón, Fazilet Kubra Boynukalin, Francesca Benini, Ivan Vogel, Claudia Livi, J. F. Cuzzi, Laura Girardi, and Eva Hoffmann
- Subjects
Male ,Embryonic Development ,Aneuploidy ,Fertilization in Vitro ,Biology ,Article ,Miscarriage ,Andrology ,03 medical and health sciences ,0302 clinical medicine ,Double-Blind Method ,Pregnancy ,Genetics ,medicine ,FERTILITY ,Humans ,Inner cell mass ,Genetic Testing ,Prospective Studies ,Genetics (clinical) ,030304 developmental biology ,0303 health sciences ,030219 obstetrics & reproductive medicine ,ANEUPLOIDIES ,Mosaicism ,Incidence ,Infant, Newborn ,Pregnancy Outcome ,Infant ,Chromosome ,Embryo ,Newborn ,Embryo Transfer ,medicine.disease ,Uniparental disomy ,CHROMOSOMAL MOSAICISM ,Blastocyst ,embryonic structures ,Female ,Ploidy ,Settore SECS-S/01 - Abstract
Summary Chromosome imbalance (aneuploidy) is the major cause of pregnancy loss and congenital disorders in humans. Analyses of small biopsies from human embryos suggest that aneuploidy commonly originates during early divisions, resulting in mosaicism. However, the developmental potential of mosaic embryos remains unclear. We followed the distribution of aneuploid chromosomes across 73 unselected preimplantation embryos and 365 biopsies, sampled from four multifocal trophectoderm (TE) samples and the inner cell mass (ICM). When mosaicism impacted fewer than 50% of cells in one TE biopsy (low-medium mosaicism), only 1% of aneuploidies affected other portions of the embryo. A double-blinded prospective non-selection trial (NCT03673592) showed equivalent live-birth rates and miscarriage rates across 484 euploid, 282 low-grade mosaic, and 131 medium-grade mosaic embryos. No instances of mosaicism or uniparental disomy were detected in the ensuing pregnancies or newborns, and obstetrical and neonatal outcomes were similar between the study groups. Thus, low-medium mosaicism in the trophectoderm mostly arises after TE and ICM differentiation, and such embryos have equivalent developmental potential as fully euploid ones.
- Published
- 2021
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