Developmental potential of aneuploid human embryos cultured beyond implantation

• Published in: Nature communications Vol. 11; no. 1; pp. 3987 - 15
• Main Authors: Shahbazi, Marta N., Wang, Tianren, Tao, Xin, Weatherbee, Bailey A. T., Sun, Li, Zhan, Yiping, Keller, Laura, Smith, Gary D., Pellicer, Antonio, Scott, Richard T., Seli, Emre, Zernicka-Goetz, Magdalena
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 10.08.2020; Nature Publishing Group; Nature Portfolio
• Subjects: 13; 13/1; 13/100; 13/106; 13/109; 14; 14/19; 38; 38/22; 38/23; 631/136/1455; 631/136/2086/1986; 631/80/641/2002; Aneuploidy; Antigens, CD - genetics; Cadherins - genetics; Cadherins - metabolism; Cell Adhesion; Cell adhesion & migration; Cell culture; Cell cycle; Cell Cycle Checkpoints; Cell differentiation; Cell Lineage; Chromosome number; Chromosome Segregation; Chromosomes; Chromosomes, Human, Pair 16; Chromosomes, Human, Pair 21; E-cadherin; Embryo Implantation - genetics; Embryo, Mammalian; Embryonic Development; Embryos; Female; Genes, erbB-1 - genetics; Genetic screening; Genetic Testing; Humanities and Social Sciences; Humans; Implantation; Monosomy; Mosaicism; multidisciplinary; Phenotypes; Placenta; Pregnancy; Science; Science (multidisciplinary); Stem Cells; Trisomy
• DOI: 10.1038/s41467-020-17764-7
• ISSN: 2041-1723

Aneuploidy, the presence of an abnormal number of chromosomes, is a major cause of early pregnancy loss in humans. Yet, the developmental consequences of specific aneuploidies remain unexplored. Here, we determine the extent of post-implantation development of human embryos bearing common aneuploidies using a recently established culture platform. We show that while trisomy 15 and trisomy 21 embryos develop similarly to euploid embryos, monosomy 21 embryos exhibit high rates of developmental arrest, and trisomy 16 embryos display a hypo-proliferation of the trophoblast, the tissue that forms the placenta. Using human trophoblast stem cells, we show that this phenotype can be mechanistically ascribed to increased levels of the cell adhesion protein E-CADHERIN, which lead to premature differentiation and cell cycle arrest. We identify three cases of mosaicism in embryos diagnosed as full aneuploid by pre-implantation genetic testing. Our results present the first detailed analysis of post-implantation development of aneuploid human embryos. Aneuploidy, abnormal chromosome number, is a major cause of early pregnancy loss. Here the authors determine the extent of post-implantation development of human embryos with common aneuploidies in culture, finding developmental arrest of monosomy 21 embryos, and trophoblast hypo-proliferation in trisomy 16 embryos.