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Elf5 regulation in the trophectoderm.

David J Pearton1, Ric Broadhurst, Martyn Donnison

  • 1AgResearch Crown Research Institute, Hamilton, 3214, New Zealand.

Developmental Biology
|October 25, 2011
PubMed
Summary
This summary is machine-generated.

Mouse Elf5 expression in trophectoderm relies on enhancers, not a specific promoter region. This gene

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Area of Science:

  • Developmental biology
  • Genetics
  • Genomics

Background:

  • Mouse Elf5 is crucial for trophectoderm development from blastocyst to postgastrulation.
  • Understanding Elf5's regulatory elements is key to deciphering early embryonic development.

Purpose of the Study:

  • To identify and characterize the regulatory elements governing mouse Elf5 expression in the trophectoderm.
  • To investigate the conservation of Elf5 regulatory mechanisms across mammalian species.

Main Methods:

  • Transgenic assays in mice to test promoter and enhancer function.
  • Deletion analysis of the Elf5 proximal promoter and differentially methylated region (DMR).
  • Comparative analysis using cattle Elf5 BAC reporter transgenes in mice.

Main Results:

  • The proximal promoter is necessary but not sufficient for trophectoderm expression; a DMR deletion had no effect.
  • Two redundant enhancers in introns 1 and 2 drive Elf5 expression to extraembryonic ectoderm and ectoplacental cone.
  • Trophectoderm enhancers are mouse-specific; cattle Elf5 is not expressed in mouse trophectoderm, indicating a lack of evolutionary conservation.

Conclusions:

  • Mouse Elf5 trophectoderm expression is regulated by intronic enhancers and a minimal proximal promoter region.
  • The regulatory mechanisms controlling Elf5 in the trophectoderm are not conserved in cattle, where Elf5 is expressed in embryonic ectoderm.
  • This highlights species-specific divergence in the genetic control of early mammalian development.