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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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Human surface ectoderm and amniotic ectoderm are sequentially specified according to cellular density.

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Human amniotic and surface ectoderm development is clarified using a stem cell model. Cell density determines whether cells become amniotic ectoderm or retain surface ectoderm characteristics.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Human Embryogenesis

Background:

  • Specifying human amniotic and surface ectoderm remains challenging due to similar expression patterns and signaling needs.
  • This knowledge gap impedes accurate modeling of human embryogenesis.

Purpose of the Study:

  • To investigate the divergence between human amniotic and surface ectoderms.
  • To develop a human pluripotent stem cell model for studying early human development.

Main Methods:

  • Established a human pluripotent stem cell culture system.
  • Induced differentiation into amnioblast-like cells.
  • Performed single-cell RNA sequencing (scRNA-seq) analysis.

Main Results:

  • Identified an intermediate cell state with surface ectoderm gene expression during amnioblast differentiation.
  • Observed retention of surface ectoderm gene expression under confluent differentiation conditions.
  • Generated extraembryonic mesoderm-like cells from primed pluripotent stem cells.

Conclusions:

  • Propose that human amniotic and surface ectoderms specify along a common nonneural ectoderm trajectory influenced by cell density.
  • Developed a novel culture system for modeling human embryonic and extraembryonic development around gastrulation.