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The Journal of Neuroscience, November 15, 1998, 18(22):9342-9353
Granule Cell Raphes and Parasagittal Domains of Purkinje Cells: Complementary Patterns in the Developing Chick Cerebellum
John C. Lin and Constance L. Cepko Genetics Department, Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115
The extensive migration of granule cells and the parasagittal organization of Purkinje cells are two prominent features of cerebellar development. Using granule cell markers, we observed that the inward migration of a subset of granule cells occurs in streams that appear to be restricted to specific areas in the developing chick cerebellum. These streams are organized into a stereotypical series of parasagittal linear arrays, similar to the "granule cell raphes" described previously by . Similar raphes were found in the developing cerebellum of other avian species but not in the mouse cerebellum. During the period when granule cell raphes are apparent, Purkinje cells appear to be segregated into discrete parasagittal domains, interrupted by Purkinje cell-poor areas that correspond to the granule cell raphes. Purkinje cells in each domain exhibit a domain-specific expression profile of genes, including Bmp-7, EphA5/Cek-7, EphA4/Cek-8, and several chick homologs of Drosophila segmentation genes. From embryonic day 12 (E12) to E15, most of these genes gradually cease to be expressed differentially in parasagittal stripes, concurrent with the disappearance of the granule cell raphes by E15-E16. The spatial and temporal correlations of granule cell raphes and Purkinje cell parasagittal domains suggest a novel interaction between these two cell types and a potentially critical period of parasagittal patterning of the chick cerebellum.
Key words: granule cells; migration; Purkinje cells; patterning; chick embryo; cerebellum
Copyright © 1998 Society for Neuroscience 0270-6474/98/18229342-12$05.00/0
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