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Homeogenetic neural induction in Xenopus.
1Department of Biology, University of Virginia, Charlottesville 22901.
Developmental Biology
|September 1, 1991
Summary
Neural tissue can induce nearby ectoderm to become neural tissue, a process called homeogenetic neural induction. This occurs through planar signaling within the ectoderm, not from underlying mesoderm.
Area of Science:
- Developmental Biology
- Neuroscience
Background:
- Neural induction typically involves ectoderm-mesoderm interactions during gastrulation.
- Homeogenetic neural induction, where neuralized tissue induces competent ectoderm, is proposed but poorly understood.
Purpose of the Study:
- To investigate homeogenetic neural induction in Xenopus embryos.
- To determine the source of the neuralizing signal in this process.
Main Methods:
- Transplant experiments using Xenopus ectoderm placed adjacent to neural plate tissue.
- Recombinant experiments culturing ectoderm with neural plate or dorsolateral mesoderm.
- Assaying neural tissue formation using neural cell adhesion molecule (N-CAM) expression.
Main Results:
- Ectoderm transplanted near the neural plate formed neural tissue (N-CAM positive).
- Ectoderm cultured with neural plate tissue, but not dorsolateral mesoderm, expressed neural markers.
- Neural tissue itself can induce adjacent competent ectoderm.
Conclusions:
- Neural tissue can homeogenetically induce competent ectoderm.
- This induction likely occurs via planar signaling within the ectoderm.
- This mechanism may play a role in normal neural development and patterning near the neural plate.