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Updated: Feb 16, 2026
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Cell Movements during Gastrulation of Starfish Larvae.
The Biological Bulletin
|January 5, 2018
Summary
Starfish gastrulation involves significant cell migration into the archenteron. This study tracks cell movements and archenteron expansion during early development.
Area of Science:
- Developmental Biology
- Marine Biology
- Embryology
Background:
- Understanding archenteron formation is crucial for comprehending embryonic development in echinoderms.
- Previous studies have established general timelines for gastrulation but lacked detailed cellular tracking within the archenteron.
Purpose of the Study:
- To elucidate the cellular dynamics and morphogenetic movements during archenteron formation in starfish embryos.
- To precisely map the contribution of different blastomeres to the archenteron wall and its subsequent development.
Main Methods:
- Quantitative analysis of cellular volume changes throughout gastrulation.
- Utilized tracer enzyme injection to track blastomere lineage and cell migration patterns.
- Applied vital staining techniques to mark and observe cell movements around the blastopore.
Main Results:
- No significant change in overall embryonic cellular volume occurred during gastrulation.
- The archenteron volume increased substantially (10-20%) from early gastrulation to mesenchyme migration.
- Tracer studies revealed cell migration from the outer layer to the archenteron wall, with specific lineage tracing of blastomeres.
- Vital staining indicated sequential addition of presumptive esophagus, stomach, and intestine to the archenteron.
- Observed a 180-degree clockwise twisting of the presumptive cardiac sphincter region, influencing adjacent cell zones.
Conclusions:
- Starfish gastrulation is characterized by directed cell migration into the developing archenteron.
- The study provides a detailed spatiotemporal map of cell contributions to the archenteron.
- Morphogenetic movements, including twisting, play a significant role in shaping the early digestive tract.
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