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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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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Related Experiment Video

Updated: May 24, 2025

Generation of Dispersed Presomitic Mesoderm Cell Cultures for Imaging of the Zebrafish Segmentation Clock in Single Cells
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Progress in understanding the vertebrate segmentation clock.

Akihiro Isomura1,2,3,4, Ryoichiro Kageyama5,6

  • 1Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan. aisomura@infront.kyoto-u.ac.jp.

Nature Reviews. Genetics
|March 4, 2025
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Summary
This summary is machine-generated.

The segmentation clock, crucial for embryonic development, synchronizes cellular oscillations to form somites. New research uses advanced imaging and stem cell tech to reveal how this clock achieves species-specific timing and cell coordination.

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Related Experiment Videos

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Embryogenesis

Background:

  • The segmentation clock, a molecular oscillator, governs periodic somite formation from presomitic mesoderm in vertebrate embryos.
  • Hairy/Hairy-related basic helix-loop-helix (bHLH) repressors drive oscillatory gene expression, controlling downstream factors for somite segmentation.
  • While clock components are known, mechanisms for inter-cellular synchronization and species-specific periodicity remain unclear.

Purpose of the Study:

  • To investigate the synchronization mechanisms of the segmentation clock across cells.
  • To understand how species-specific periodicity in somitogenesis is achieved.
  • To elucidate the spatiotemporal coordination of morphogenesis during embryonic development.

Main Methods:

  • Live imaging techniques to observe cellular dynamics in real-time.
  • Stem cell and organoid technologies for in vitro modeling of somitogenesis.
  • Synthetic approaches to perturb and analyze clock components and interactions.

Main Results:

  • Detailed mechanisms of segmentation clock synchronization are being uncovered.
  • Insights into the regulation of species-specific somitogenesis periodicity are emerging.
  • Advanced technologies are providing a clearer picture of spatiotemporal coordination in embryonic development.

Conclusions:

  • Recent advances are illuminating the complex coordination of the segmentation clock.
  • Understanding these mechanisms is key to comprehending vertebrate embryonic development.
  • The study highlights the power of integrating live imaging, stem cells, and synthetic biology to address fundamental developmental questions.