Gastruloids asin vitromodels of embryonic blood development with spatial and temporal resolution

Gastruloids are three-dimensional embryonic organoids that reproduce key features of early mammalian developmentin vitrowith unique scalability, accessibility, and spatiotemporal similarity to real embryos. Recently, we adapted gastruloid culture conditions to promote cardiovascular development. In this work, we extended these conditions to capture features of embryonic blood development through a combination of immunophenotyping, detailed transcriptomics analysis, and identification of blood stem/progenitor cell potency. We uncovered the emergence of blood progenitor and erythroid-like cell populations in late gastruloids and showed the multipotent clonogenic capacity of these cells, bothin vitroand after transplantation into irradiated mice. We also identified the spatial localization near a vessel-like plexus in the anterior of gastruloids with similarities to the emergence of blood stem cells in the embryo. These results highlight the potential and applicability of gastruloids to thein vitrostudy of complex processes in embryonic blood development with spatiotemporal fidelity.