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Related Concept Videos

Gastrulation01:56

Gastrulation

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 will form...

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From Stem Cells to Post-gastrulation Amnioids (PGAs): A Protocol to Model Human Extra-Embryonic Development.

Borzo Gharibi1, Silvia D M Santos2

  • 1Quantitative Stem Cell Biology Laboratory, The Francis Crick Institute, London, UK.

Methods in Molecular Biology (Clifton, N.J.)
|March 30, 2026
PubMed
Summary

Researchers created a novel stem cell model, post-gastrulation amnioids (PGAs), to study early human development. These PGAs mimic the amniotic sac, offering a scalable platform for in vitro embryogenesis research.

Keywords:
3D modelsAmnionEarly developmentExtra-embryonic tissueHuman embryonic stem cellsPost-gastrulation

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Reproductive Medicine

Background:

  • Studying early human development is limited by ethical and technical challenges.
  • Extra-embryonic tissues are crucial for embryonic development but difficult to study in vitro.
  • Stem cell-based models offer promising alternatives for investigating human embryogenesis.

Purpose of the Study:

  • To develop a novel in vitro model mimicking post-gastrulation human amnion development.
  • To establish a reproducible and scalable system for studying early human extra-embryonic tissues.
  • To provide a platform for investigating cell-cell interactions in early embryogenesis.

Main Methods:

  • Generation of 3D embryonic stem cell-derived structures termed post-gastrulation amnioids (PGAs).
  • Morphological characterization using immunofluorescence staining.
  • Co-culture assays to study embryonic and extra-embryonic cell interactions.

Main Results:

  • PGAs successfully mimic the structure and function of the post-gastrulation human amnion.
  • The model forms a fluid-filled amniotic sac-like membrane with distinct cell layers.
  • PGAs demonstrate gradual expansion in culture and are reproducible for high-throughput studies.

Conclusions:

  • Post-gastrulation amnioids (PGAs) represent a significant advancement in modeling early human development in vitro.
  • This stem cell-based model facilitates the study of amnion development and extra-embryonic tissue interactions.
  • PGAs offer a scalable and reproducible platform for future research in developmental biology and regenerative medicine.