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Related Experiment Videos

Getting your head around Hex and Hesx1: forebrain formation in mouse.

J P Martinez-Barbera1, R S Beddington

  • 1Division of Mammalian Development, National Institute for Medical Research, London, England.

The International Journal of Developmental Biology
|April 9, 2001
PubMed
Summary

Mouse development involves two signaling centers for neural axis formation. Hex and Hesx1 genes are crucial for forebrain expansion, not initial neural induction.

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Area of Science:

  • Developmental biology
  • Genetics
  • Neuroscience

Background:

  • Two signaling centers, the anterior visceral endoderm (AVE) and the node, are critical for mouse neural axis formation.
  • The AVE and node initiate head induction and anterior neural patterning, with node derivatives maintaining anterior neural character.

Purpose of the Study:

  • To investigate the roles of homeobox genes Hex and Hesx1 in anterior neural patterning during mouse development.
  • To understand the specific contributions of Hex and Hesx1 to early neural induction versus later forebrain development.

Main Methods:

  • Analysis of Hex and Hesx1 mutant mice.
  • Examination of gene expression patterns in relevant embryonic tissues.
  • Investigation of signaling pathways, including Fgf8, involved in anterior patterning.

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Main Results:

  • Hex and Hesx1 mutant mice show minimal defects in early anterior neural induction.
  • Both Hex and Hesx1 are essential for the subsequent proper expansion of the forebrain region.
  • Disturbances in the Fgf8 signaling center in the anterior neural ridge may underlie observed anterior defects.

Conclusions:

  • Hex and Hesx1 play a critical role in the later stages of anterior neural development, specifically forebrain expansion.
  • These genes are not essential for the initial steps of anterior neural induction but are required for its proper progression.
  • Fgf8 signaling disruption is a potential cause for the anterior patterning defects observed in Hex and Hesx1 mutants.