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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
Published on: February 16, 2017
Signaling pathways and axis formation in the lower metazoa
Thomas W Holstein1, Hiroshi Watanabe, Suat Ozbek
1Department of Molecular Evolution and Genomics, Centre for Organismal Studies, Heidelberg University, Germany.
Current Topics in Developmental Biology
|November 15, 2011
Summary
The Wnt/β-catenin pathway, not just Hox genes, likely established the primary body axis in early animals. This review explores its evolutionary role in body axis determination across metazoans.
Area of Science:
- Evolutionary developmental biology
- Molecular evolution
- Genomics
Background:
- The establishment of the anteroposterior body axis in bilaterians is primarily attributed to Hox genes.
- Emerging evidence suggests the Wnt/β-catenin pathway may have played a more ancient, primordial role in body axis formation in early metazoans.
- Understanding the evolution of body axes is crucial for deciphering early animal diversification.
Purpose of the Study:
- To review molecular data on the evolution of signaling pathways involved in body axis establishment.
- To focus on the role of the Wnt/β-catenin pathway as a primordial signaling system.
- To investigate the establishment of primary and successive body axes during early metazoan evolution.
Main Methods:
- Genomic analyses of basal metazoan model organisms.
- Comparative molecular data review.
- Focus on evolutionary signaling pathways.
Main Results:
- Hox genes are key for bilaterian anteroposterior axis patterning.
- The Wnt/β-catenin pathway shows evidence of a primordial role in body axis determination in lower metazoans.
- Evolutionary analysis highlights the ancient origins of body axis establishing mechanisms.
Conclusions:
- The Wnt/β-catenin pathway likely predates Hox genes in body axis determination.
- Early metazoan evolution involved conserved signaling pathways for body plan development.
- Further research in basal metazoans is essential to fully understand body axis evolution.
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