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Lophotrochozoan Zic Genes.

Jun Aruga1

  • 1Department of Medical Pharmacology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. aruga@nagasaki-u.ac.jp.

Advances in Experimental Medicine and Biology
|February 15, 2018
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Summary

Lophotrochozoan Zic genes are crucial for developing novel structures like chaetae and for head regeneration in planarians by regulating adult stem cells. These findings illuminate Zic gene roles in evolution and stem cell biology.

Keywords:
AnnelidaBrachiopodaDevelopmentDicyemidaGene expressionLophotrochozoaPlatyhelminthesRegenerationZic

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Lophotrochozoa, a major animal phylum, includes diverse invertebrates like mollusks and annelids.
  • Zic family genes are known developmental regulators, but their roles across Lophotrochozoa are not fully understood.
  • Understanding Zic gene function provides insights into the evolution of invertebrate body plans and stem cell regulation.

Purpose of the Study:

  • To investigate the expression patterns and functions of Zic genes in various lophotrochozoan species.
  • To elucidate the role of Zic genes in the development of species-specific structures, such as chaetae.
  • To explore the involvement of Zic genes in regenerative processes and stem cell regulation within Lophotrochozoa.

Main Methods:

  • Comparative gene expression analysis across different lophotrochozoan species (annelids, brachiopods, mesozoans, platyhelminths).
  • Investigating Zic gene function in head regeneration using platyhelminth models.
  • Analyzing the molecular pathways, including Wnt-β-catenin signaling, associated with Zic gene activity.

Main Results:

  • Zic genes are expressed in developing brain, mesoderm, and chaetal sacs in annelids and brachiopods, suggesting a role in chaetae development.
  • In Dicyema acuticephalum, Zic genes are expressed in gonads, indicating a role in germ cell development.
  • In Schmidtea mediterranea, Zic is essential for head regeneration, acting on neoblasts (adult stem cells) and involving Wnt-β-catenin pathway suppression.

Conclusions:

  • Lophotrochozoan Zic genes play conserved and divergent roles in development, including the evolution of novel structures like chaetae.
  • Zic genes are critical for adult stem cell regulation and regenerative capabilities, particularly in platyhelminths.
  • These findings enhance our understanding of lophotrochozoan body plan evolution and the molecular basis of stem cell maintenance.