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Transient neuronal populations are required to guide callosal axons: a role for semaphorin 3C.

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  • 2009-10-28
Published in:
  • PLoS biology. - 2009
Acrocallosal Syndrome
Animals
Axons
Cell Line
Cell Movement
Coculture Techniques
Corpus Callosum
Humans
Mice
Neural Pathways
Neurons
Neuropilin-1
Semaphorins
English The corpus callosum (CC) is the main pathway responsible for interhemispheric communication. CC agenesis is associated with numerous human pathologies, suggesting that a range of developmental defects can result in abnormalities in this structure. Midline glial cells are known to play a role in CC development, but we here show that two transient populations of midline neurons also make major contributions to the formation of this commissure. We report that these two neuronal populations enter the CC midline prior to the arrival of callosal pioneer axons. Using a combination of mutant analysis and in vitro assays, we demonstrate that CC neurons are necessary for normal callosal axon navigation. They exert an attractive influence on callosal axons, in part via Semaphorin 3C and its receptor Neuropilin-1. By revealing a novel and essential role for these neuronal populations in the pathfinding of a major cerebral commissure, our study brings new perspectives to pathophysiological mechanisms altering CC formation.
Language
  • English
Open access status
gold
Identifiers
Persistent URL
https://sonar.ch/global/documents/181801
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