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Related Experiment Videos

Polyploidization of extraembryonic tissues during mouse embryogenesis

E B Ilgren

    Journal of Embryology and Experimental Morphology
    |October 1, 1980
    PubMed
    Summary
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    Mouse extraembryonic development involves a giant-cell transformation where primitive endoderm cells become polyploid. This process, observed in visceral yolk-sac endoderm and amniotic cells, is a general feature of development.

    Area of Science:

    • Developmental biology
    • Cell biology
    • Genetics

    Background:

    • Visceral yolk-sac endoderm originates from the primitive endoderm of the mouse blastocyst.
    • Primitive endodermal cells accumulate nuclei with significantly more than the haploid DNA amount during development.
    • Giant nuclei are also observed in amniotic cells, though the mechanism is unclear.

    Purpose of the Study:

    • To investigate the mechanism behind the giant-cell transformation in mouse extraembryonic development.
    • To determine if polyploidy is a general feature of extraembryonic membrane development.
    • To discuss the basis and significance of these findings in a broader developmental context.

    Main Methods:

    • Analysis of metaphases in developing mouse extraembryonic tissues.

    Related Experiment Videos

  • Microscopic examination of cell nuclei in primitive endodermal and amniotic cells.
  • Comparative analysis with other extraembryonic membranes.

    • Main Results:

    • Diploid precursors of endodermal giant cells undergo polyploidization.
    • The giant-cell transformation is a widespread phenomenon in mouse extraembryonic development, not limited to trophoblast.
    • Amniotic cells also exhibit giant nuclei, suggesting a common underlying mechanism.

    Conclusions:

    • The giant-cell transformation is a general characteristic of mouse extraembryonic development.
    • Polyploidy is a key feature in the development of various extraembryonic membranes.
    • Understanding this process offers insights into broader principles of plant and animal development.