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- Title
The transmembrane semaphorin Sema6A controls cerebellar granule cell migration.
- Authors
Kerjan, Géraldine; Dolan, Jackie; Haumaitre, Cécile; Schneider-Maunoury, Sylvie; Fujisawa, Hajime; Mitchell, Kevin J.; Chédotal, Alain
- Abstract
The transmembrane semaphorin protein Sema6A is broadly expressed in the developing nervous system. Sema6A repels several classes of developing axons in vitro and contributes to thalamocortical axon guidance in vivo. Here we show that during cerebellum development, Sema6A is selectively expressed by postmitotic granule cells during their tangential migration in the deep external granule cell layer, but not during their radial migration. In Sema6A-deficient mice, many granule cells remain ectopic in the molecular layer where they differentiate and are contacted by mossy fibers. The analysis of ectopic granule cell morphology in Sema6a−/− mice, and of granule cell migration and neurite outgrowth in cerebellar explants, suggests that Sema6A controls the initiation of granule cell radial migration, probably through a modulation of nuclear and/or soma translocation. Finally, the analysis of mouse chimeras suggests that this function of Sema6A is primarily non-cell-autonomous.
- Subjects
CEREBELLUM; AXONS; NEURONS; MORPHOGENESIS; CELL migration; NERVOUS system; DEVELOPMENTAL neurobiology
- Publication
Nature Neuroscience, 2005, Vol 8, Issue 11, p1516
- ISSN
1097-6256
- Publication type
Article
- DOI
10.1038/nn1555