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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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Deconstructing gastrulation at single-cell resolution.

Tomer Stern1, Stanislav Y Shvartsman2, Eric F Wieschaus1

  • 1Department of Molecular Biology, Princeton University, Princeton, NJ, USA; The Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ, USA.

Current Biology : CB
|March 15, 2022
PubMed
Summary
This summary is machine-generated.

Early animal embryo development involves cell shape changes and divisions. This study reveals how cell loss during gastrulation is balanced by cell division and links cell intercalation to axis elongation in Drosophila embryos.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biophysics

Background:

  • Gastrulation involves epithelial sheet deformations driven by cell division, shape changes, and intercalation.
  • Previous research often focused separately on cellular processes or large-scale tissue deformations.
  • Advances in microscopy and image processing enable integrated approaches.

Purpose of the Study:

  • To bridge cellular and tissue-level perspectives in gastrulation research.
  • To deconstruct early gastrulation stages in the entire Drosophila embryo.
  • To develop an integrated computational framework for analyzing gastrulation dynamics.

Main Methods:

  • Utilized an integrated computational framework for cell segmentation and tracking.
  • Employed efficient algorithms for detecting cellular events during gastrulation.
  • Mapped detected cellular events onto the blastoderm shell for spatial analysis.

Main Results:

  • Identified transient mitotic rounding as a primary mechanism compensating for cell loss during invagination.
  • Derived quantitative relationships between cell intercalation frequency and axis elongation rate.
  • Visualized complex cellular activity patterns within anatomical domains.

Conclusions:

  • Transient mitotic rounding plays a key role in maintaining cell numbers during gastrulation.
  • Cell intercalation directly influences the rate of embryonic axis elongation.
  • This work provides a foundation for systems-level analysis of early animal development.