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Gastrulation01:56

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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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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Extra-embryonic mesoderm during development and in in vitro models.

Eliana Nehme1, Amitesh Panda2, Isabelle Migeotte1

  • 1IRIBHM J.E. Dumont, Université Libre de Bruxelles, Brussels, B-1070, Belgium.

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Extra-embryonic mesoderm is vital for vertebrate development and mammalian pregnancy. This review explores its origins, functions, and in vitro models for future stem cell research.

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Area of Science:

  • Developmental biology
  • Stem cell research
  • Comparative embryology

Background:

  • Extra-embryonic tissues are crucial for vertebrate development and mammalian reproduction.
  • The extra-embryonic mesoderm, a key germ layer in amniotes, is understudied.
  • Its roles include hematopoiesis and forming structures like the placenta.

Purpose of the Study:

  • To review the embryonic origin and function of extra-embryonic mesoderm in vertebrates.
  • To compare in vitro models generating extra-embryonic mesoderm-like cells.
  • To discuss advancing stem cell-based embryo models using current insights.

Main Methods:

  • In vivo studies of vertebrate embryos.
  • Comparative analysis of in vitro models.
  • Literature review and synthesis.

Main Results:

  • Extra-embryonic mesoderm's origin and specification vary across species.
  • Molecular mechanisms of its formation and function require further elucidation.
  • In vitro models offer valuable tools for studying this germ layer.

Conclusions:

  • Integrating in vivo and in vitro findings is key to understanding extra-embryonic mesoderm.
  • Advanced stem cell-based embryo models can be developed through this integrated approach.
  • Further research is needed to fully understand the conserved and divergent aspects of extra-embryonic mesoderm development.