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High Resolution Whole Mount In Situ Hybridization within Zebrafish Embryos to Study Gene Expression and Function
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Epigenetic marking of the zebrafish developmental program.

Ingrid S Andersen1, Leif C Lindeman, Andrew H Reiner

  • 1Stem Cell Epigenetics Laboratory, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway.

Current Topics in Developmental Biology
|April 17, 2013
PubMed
Summary
This summary is machine-generated.

Early zebrafish embryos prepare for gene activation through epigenetic changes before zygotic genome activation (ZGA). This review explores how DNA methylation and histone modifications establish transcriptional competence, programming ZGA.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Genomics

Background:

  • Anamniote embryos exhibit a prolonged period of cell division without transcription.
  • Zygotic genome activation (ZGA) initiates gene expression during the midblastula transition in zebrafish.
  • Mechanisms regulating transcriptional competence and ZGA timing/location remain largely unexplored.

Purpose of the Study:

  • To review recent findings on epigenetic modifications during early zebrafish development.
  • To investigate how embryos gain transcriptional competence and initiate gene expression.
  • To explore models for the origin of early embryonic epigenetic states.

Main Methods:

  • Review of recent data on DNA methylation.
  • Analysis of posttranslational histone modifications.
  • Examination of epigenetic transitions during zebrafish embryogenesis.

Main Results:

  • Epigenetic prepatterning of the embryonic gene expression program is emerging.
  • Transitions in DNA methylation and histone modifications correlate with transcriptional competence.
  • Early epigenetic states provide insights into ZGA regulation.

Conclusions:

  • Epigenetic mechanisms play a crucial role in programming ZGA.
  • Understanding these epigenetic changes is key to deciphering ZGA regulation.
  • A model of epigenetic prepatterning offers a framework for early embryonic gene regulation.