Common Mechanisms in Vertebrate Axonal Navigation: Retinal Transplants Between Distantly Related Amphibia
作者:
HarrisWilliam A.,
ColeJulia,
期刊:
Journal of Neurogenetics
(Taylor Available online 1984)
卷期:
Volume 1,
issue 2
页码: 127-140
ISSN:0167-7063
年代: 1984
DOI:10.3109/01677068409107078
出版商: Taylor&Francis
关键词: evolution;nervous system;retinotectal;xenoplastic transplantion;axonal navigation -amphibian
数据来源: Taylor
摘要:
Embryonic eye primordia were transplanted from the anuran,Xenopus laevis, to the urodele,Ambystoma mexicanum, in order to assess whether retinal axons of one species could grow to appropriate central targets in a distantly related species. To trace the early retinal projections,Xenopuseye primordia were removed, incubated for 20 min in a solution containing [3H]proline, washed, and then transplanted to host axolotl embryos. Genetically eyeless hosts were used in some of the experiments so that theXenopusoptic fibers would not be guided to their targets by the host's own optic nerve projections.Xenopuseyes were usually able to differentiate into small eyes in the axolotl host. Shortly after primary differentiation, the development of these eyes seemed to arrest. Autoradiography on paraffin sections of the central nervous system of the host revealed that in some casesXenopusretinal ganglion cells were indeed able to send axons to the tectum of the axolotl host. This result suggests that the mechanisms of axonal navigation for this particular central projection are evolutionarily conserved.
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