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Related Experiment Video

Updated: Jul 21, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps

Published on: February 9, 2017

Cell dynamics during somite boundary formation revealed by time-lapse analysis.

Paul M Kulesa¹, Scott E Fraser

¹Division of Biology, Beckman Institute 139-74, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)

|November 2, 2002

Summary

Somite segmentation in chick embryos involves cells actively separating from the segmental plate, not just passive slicing. This dynamic process reveals new insights into early embryonic development and cell fate.

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Area of Science:

Developmental biology
Embryology
Cell biology

Background:

Somite segmentation is a fundamental process in vertebrate embryonic development.
The precise mechanisms and cellular behaviors driving somite formation are not fully understood.
Previous models suggested a simpler, periodic slicing of tissue blocks.

Purpose of the Study:

To investigate the dynamic cellular processes underlying somite segmentation in living chick embryos.
To determine if cells are pre-assigned to somites as they form.
To provide a spatiotemporal framework linking gene expression and cell movements during somite shaping.

Main Methods:

Live imaging of somite segmentation in chick embryos.
Tracking of cell movements relative to somite and gene expression boundaries.
Analysis of cell behavior at the presumptive somite boundary and origin.

Main Results:

Somite segmentation is a choreographed separation where the somite actively pulls from the segmental plate.
Cells migrate across presumptive somite boundaries, challenging pre-existing gene expression boundary correlations.
Cells are not pre-assigned to specific somites as they emerge from the node.

Conclusions:

Somite formation is a dynamic cellular process involving active separation and cell migration.
The study refines our understanding of the spatiotemporal regulation of somite segmentation.
Provides a framework for future research on the interplay between cell movement and gene regulation in development.