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