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Related Experiment Videos

Regulated expression pattern of gremlin during zebrafish development.

Stefania Nicoli1, Claudio N Gilardelli, Ombretta Pozzoli

  • 1Department of Biomedical Sciences and Biotechnology, University of Brescia, 25123 Brescia, Italy.

Gene Expression Patterns : GEP
|March 8, 2005
PubMed
Summary

Zebrafish gremlin (grm) is a novel dorsalizing factor crucial for embryonic development. Its expression is regulated by fibroblast growth factor-8 (Fgf8) and sonic hedgehog (Shh) signaling pathways.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Xenopus laevis Gremlin is a secreted protein with axial patterning activity.
  • A homologous sequence was identified in zebrafish (Danio rerio) during a search for developmental genes.

Purpose of the Study:

  • To clone zebrafish gremlin (grm) and characterize its expression pattern during embryonic development.
  • To investigate the regulatory mechanisms controlling grm expression.

Main Methods:

  • Gene cloning of zebrafish gremlin.
  • Analysis of grm transcript and protein localization during zebrafish development.
  • Examination of grm expression in fibroblast growth factor-8 (fgf8) and sonic hedgehog (shh) mutants.

Main Results:

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  • Zebrafish grm is transcribed maternally and zygotically starting at the mid-blastula transition (MBT).
  • grm expression is initially widespread, then restricted to dorsolateral regions during gastrulation, and later detected in presomitic mesoderm, somites, and ventral neural tube.
  • grm transcript is downregulated between 24-48 hours post-fertilization (hpf), while protein persists; expression is reduced in fgf8 and shh mutants.

Conclusions:

  • Zebrafish grm plays a role in embryonic axial patterning and somite development.
  • Fgf8 and Shh signaling pathways likely regulate grm expression, suggesting a feedback loop.
  • grm is a key developmental gene regulated by conserved signaling pathways.