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Neural induction and regionalisation in the chick embryo
K G Storey1, J M Crossley, E M De Robertis
1Department of Human Anatomy, Oxford, UK.
Development (Cambridge, England)
|March 1, 1992
Summary
The age of Hensen's node is critical for chick nervous system development. Younger nodes induce both anterior and posterior neural tissue, while older nodes primarily induce posterior structures.
Area of Science:
- Developmental biology
- Neuroscience
- Embryology
Background:
- Investigating early chick nervous system development is crucial for understanding fundamental biological processes.
- Hensen's node is a key signaling center in early embryonic development.
Purpose of the Study:
- To investigate the role of Hensen's node age in neural induction and regionalization.
- To determine the contribution of host and donor tissues in chimaeric embryos.
- To identify molecular markers for characterizing ectopic neural axes.
Main Methods:
- Transplantation of Hensen's node into chick embryos.
- Construction of chick/quail chimaeras to trace cell lineage.
- Utilizing molecular markers (Engrailed, 3A10, XlHbox1/Hox3.3) for axis identification.
Main Results:
- Young Hensen's nodes (stages 2-4) induced both anterior and posterior neural tissue.
- Older nodes (stages 5-6) showed reduced inducing ability, generating only posterior neural tissue.
- Epiblast competence for neural induction declines after stage 4.
Conclusions:
- Initial neural induction occurs before stage 4 in chick embryos.
- Anteroposterior regionalization of the nervous system appears to be a later process.
- Mechanisms for head and spinal cord induction may differ, with potential roles for homeogenetic induction or elongation of neural primordia.