Human blastoid from primed human embryonic stem cells
Imamura, S.; Wen, X.; Terada, S.; Yamamoto, A.; Mutsuda-Zapater, K.; Sawada, K.; Yoshimoto, K.; Tanaka, M.; Kamei, K.-i.
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Artificial human blastoids are used to investigate early embryo development, pregnancy failures, and birth deficiencies, previously impossible without human embryos. Recent methods generating blastoids used human naive pluripotent stem cells, which are prone to genomic instability during in vitro culturing. Here, we introduce a simple, robust, and scalable method for generating human blastoids from more stable, primed human pluripotent stem cells (hPSC). Using a non-cell-adhesive hydrogel, hPSC aggregates formed an asymmetric blastoid structure with a cellular distribution similar to that of a human blastocyst, with in vitro implantation capability. Single-cell RNA-seq followed by cellular trajectory analysis revealed that hydrogel promoted differentiation to tri-lineage cells associated with a blastocyst. This model will allow studies on the underlying mechanisms of human pre- and postimplantation processes, consider elaborating on the potential implications of the model on assistive reproductive technology. One Sentence SummaryNo more than 125 characters and spaces.
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