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Hypoblast from human pluripotent stem cells regulates epiblast development.

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Researchers developed novel hypoblast-like cells (nHyCs) from human pluripotent stem cells (hPSCs). These cells form self-organizing bilaminar structures, modeling early human embryonic development and guiding epiblast progression.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Human Embryogenesis

Background:

  • Ethical and legal restrictions limit human embryo studies post-implantation.
  • In vitro self-organizing models using human stem cells are crucial for studying early development.
  • Understanding human embryogenesis requires models that recapitulate key developmental stages.

Purpose of the Study:

  • To generate authentic hypoblast cells from naive human pluripotent stem cells (hPSCs).
  • To model early human embryonic development using self-organizing stem cell aggregates.
  • To identify mechanisms guiding epiblast development by extraembryonic tissues.

Main Methods:

  • Genetic and non-genetic approaches to derive naive hPSC-derived hypoblast-like cells (nHyCs).
  • Formation of three-dimensional bilaminar structures (bilaminoids) from nHyCs and naive hPSCs.
  • Incorporation of trophectoderm analogues and manipulation of the DKK1/OTX2 domain.

Main Results:

  • nHyCs spontaneously assembled with naive hPSCs into bilaminoids with a pro-amniotic-like cavity.
  • Trophectoderm presence increased bilaminoid formation efficiency and supported epiblast development via IL-6.
  • Bilaminoids recapitulated anterior-posterior axis patterning and pregastrula-stage cell formation.

Conclusions:

  • Successfully modelled early human post-implantation development using stem cell-derived bilaminoids.
  • Identified mechanisms by which extraembryonic tissues guide epiblast growth and progression.
  • Provides a novel in vitro system for studying human embryogenesis and developmental disorders.