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Related Concept Videos

Gastrulation01:56

Gastrulation

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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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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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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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Updated: May 23, 2025

Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm
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Gastrulation: Lessons from the quail embryo.

Guilherme Ventura1, Diana Pinheiro1

  • 1Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Vienna 1030, Austria.

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Embryonic development depends on tissue interactions. New quail research reveals non-uniform force propagation shapes the embryo by influencing distinct embryonic and extraembryonic tissue responses.

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Area of Science:

  • Developmental biology
  • Cellular mechanics
  • Morphogenesis

Background:

  • Early embryonic development involves complex interactions between embryonic and extraembryonic tissues.
  • Understanding how these interactions regulate embryonic shape is crucial for developmental biology.

Purpose of the Study:

  • To investigate the mechanisms by which reciprocal interactions between embryonic and extraembryonic tissues control embryo shape.
  • To elucidate the role of force propagation in differential morphogenesis.

Main Methods:

  • Utilized quail embryos as a model system.
  • Employed advanced imaging techniques to observe tissue dynamics.
  • Analyzed force transmission across different embryonic territories.

Main Results:

  • Demonstrated that embryonic and extraembryonic tissues exhibit divergent morphogenetic responses.
  • Identified non-uniform force propagation as a key mechanism driving differential tissue behavior.
  • Showcased how these forces contribute to the overall regulation of embryo shape.

Conclusions:

  • Reciprocal tissue interactions are essential for controlling embryo shape.
  • Non-uniform force propagation mediates distinct morphogenetic responses in embryonic and extraembryonic tissues.
  • This study provides new insights into the mechanical control of early development.