Modelling mouse embryogenesis from chemically induced totipotent stem cells.

Chemically induced totipotent-like stem cells can autonomously recapitulate the entire early mouse embryogenesis, including development up to E10.5 with functional tissues.

• Why it matters: Understanding how to initiate embryogenesis from non-germline cells addresses a major challenge in developmental and synthetic biology, with implications for regenerative medicine and organism creation.
• What they did: Researchers established conditions for continuous ex utero development of mouse embryo models starting solely from ciTotiSCs, which self-organized into structures resembling natural blastocysts and progressed through key developmental stages.
• The result: The resulting ciToti-EMs closely mimic natural embryos in morphology, lineage segregation, and developmental milestones, enabling detailed study of early mammalian development and potential creation of multicellular organisms from non-germline cells.