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Full transcriptome analysis of early dorsoventral patterning in zebrafish.

Erika Fodor1, Áron Zsigmond, Balázs Horváth

  • 1Department of Genetics, Eötvös Loránd University, Budapest, Hungary.

Plos One
|August 8, 2013
PubMed
Summary

Researchers identified new genes crucial for establishing the dorsoventral (DV) axis in zebrafish embryos. Many of these genes show epigenetic modifications, suggesting a poised state for early dorsal gene activation and potential Wnt pathway modulation.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Epigenetics

Background:

  • Establishing major body axes during embryogenesis is fundamental to developmental biology.
  • While significant progress has been made in understanding axis formation genes, the genetic landscape is likely incomplete.

Purpose of the Study:

  • To identify novel genes involved in the establishment of the dorsoventral (DV) axis in early zebrafish development.
  • To investigate the transcriptional and epigenetic status of newly identified dorsal axis genes.

Main Methods:

  • Next-generation sequencing for full transcriptome analysis of normal and DV-pattern-deficient zebrafish embryos.
  • Statistical analysis to identify differentially expressed genes.
  • In situ hybridization to confirm gene expression patterns.
  • Promoter analysis and epigenetic histone modification profiling.

Main Results:

  • Identified 41 differentially expressed candidate genes.
  • Confirmed early dorsal expression for 32 genes shortly after zygotic transcription onset.
  • Most validated genes exhibit bivalent epigenetic histone modifications, indicating a poised transcriptional state.

Conclusions:

  • Revealed new candidate genes for the dorsal gene regulatory network in zebrafish.
  • Suggests that many early upregulated dorsal genes modulate the canonical Wnt pathway.
  • Highlights the role of epigenetic 'poising' in early axis patterning gene activation.