In this groundbreaking episode, Dr. Tarazi reveals exciting insights into the world of synthetic embryos constructed from embryonic stem cells (ESCs) in an ex-utero setup. This pioneering study provides an intriguing look into the future of developmental biology and biomedical research.

Dr. Tarazi's team demonstrated that naive ESCs could independently give rise to entire gastrulating embryo-like structures complete with embryonic and extraembryonic compartments. This significant feat was accomplished by adapting a recently established platform for the prolonged ex-utero growth of natural embryos.

The experiment involved co-aggregating non-transduced ESCs with naive ESCs transiently expressing Cdx2 or Gata4, crucial for promoting priming toward trophectoderm and primitive endoderm lineages, respectively. The result was the creation of post-gastrulation synthetic whole embryo models (sEmbryos).

These sEmbryos accomplished gastrulation and advanced through key developmental milestones, developing organ progenitors within complex extraembryonic compartments akin to E8.5 stage mouse embryos. This illuminating study underscores the remarkable potential of naive pluripotent cells to self-organize and functionally reconstitute and model the entire mammalian embryo beyond gastrulation.

Join us as we delve into this fascinating world of synthetic embryos with Dr. Tarazi.

Keywords: Dr. Tarazi, Synthetic Embryos, Embryonic Stem Cells, Ex Utero, Gastrulation, Embryo-like Structures, Naive ESCs, Cdx2, Gata4, Trophectoderm, Primitive Endoderm, Developmental Milestones, Biomedical Research.

Post-Gastrulation Synthetic Embryos Generated Ex Utero from Mouse Naïve ESCs by Shadi Tarazi et al. https://doi.org/10.1016/j.cell.2022.07.028 Weizmann Institute of Science