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Gastrulation

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...

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Related Experiment Video

Updated: May 6, 2026

Genetic Manipulation of the Mouse Developing Hypothalamus through In utero Electroporation

Genetic Manipulation of the Mouse Developing Hypothalamus through In utero Electroporation

Published on: July 24, 2013

Location of transient ectodermal progenitor potential in mouse development.

Lingyu Li¹, Chang Liu, Steffen Biechele

¹Program in Developmental and Stem Cell Biology, Hospital for Sick Children Research Institute, 555 University Avenue, Toronto, ON M5G 1X8, Canada.

Development (Cambridge, England)

|October 18, 2013

Summary

This summary is machine-generated.

Researchers identified a specific early mouse embryo region at E7.0 that differentiates into neural or epidermal ectoderm based on BMP4 signaling. Inhibiting Nodal signaling also directs pluripotent cells toward ectoderm lineages.

Keywords:

BMP4 Ectoderm Epidermis Nodal

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Last Updated: May 6, 2026

Genetic Manipulation of the Mouse Developing Hypothalamus through In utero Electroporation

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Published on: July 24, 2013

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Separation of Mouse Embryonic Facial Ectoderm and Mesenchyme

Separation of Mouse Embryonic Facial Ectoderm and Mesenchyme

Published on: April 12, 2013

Area of Science:

Developmental biology
Stem cell differentiation
Molecular signaling

Background:

Ectoderm is a primary germ layer crucial for central nervous system and epidermis formation.
Early ectoderm development in mouse embryos is poorly understood due to its transient nature and lack of molecular markers.
BMP and Nodal signaling pathways play critical roles in embryonic patterning and cell fate determination.

Purpose of the Study:

To investigate the differentiation potential of isolated ectoderm tissue in response to BMP signaling at different embryonic stages (E6.5, E7.0, E7.5).
To identify specific embryonic regions and signaling conditions that influence ectoderm lineage specification.
To explore the role of Nodal signaling in directing pluripotent cells towards ectoderm fates in vitro.

Main Methods:

Isolation and culture of ectoderm tissue explants from mouse embryos at E6.5, E7.0, and E7.5.
Manipulation of BMP signaling pathways (specifically BMP4) to observe effects on differentiation.
Inhibition of Nodal signaling in pluripotent epiblast cells cultured in vitro.
Analysis of cell fate towards neural or epidermal ectoderm.

Main Results:

A transient anterior-proximal ectodermal region at E7.0 was identified with dual potential for neural or epidermal differentiation.
BMP4 signaling presence or absence determined the fate towards epidermal or neural ectoderm, respectively.
Inhibition of Nodal signaling successfully directed E6.5 epiblast cells toward ectoderm lineages in vitro.

Conclusions:

The study elucidates a critical window and signaling mechanism for ectoderm development in early mouse embryos.
A specific embryonic region at E7.0 exhibits plasticity in response to BMP signaling, determining neural vs. epidermal fate.
Nodal signaling inhibition offers a potential strategy for regenerative differentiation of pluripotent stem cells into ectodermal tissues.