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First published online December 22, 2008
doi: 10.1242/10.1242/dev.025742

Development 136, 327-335 (2009)
Published by The Company of Biologists 2009
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Identification of a transient subpial neurogenic zone in the developing dentate gyrus and its regulation by Cxcl12 and reelin signaling

Guangnan Li1,*, Hiroshi Kataoka2,3, Shaun R. Coughlin2,3,4 and Samuel J. Pleasure1,4,5,*

1 Department of Neurology, UCSF School of Medicine, San Francisco, CA 94158, USA.
2 Cardiovascular Research Institute, UCSF School of Medicine, San Francisco, CA 94158, USA.
3 Department of Medicine, UCSF School of Medicine, San Francisco, CA 94158, USA.
4 Program in Developmental Biology, UCSF School of Medicine, San Francisco, CA 94158, USA.
5 Program in Neuroscience, UCSF School of Medicine, San Francisco, CA 94158, USA.

* Authors for correspondence (e-mail: grant.li{at}ucsf.edu; sam.pleasure{at}ucsf.edu)

Accepted 12 November 2008

One striking feature of dentate gyrus development, distinct from the other cortical structures, is the relocation of neural precursors from the ventricular zone to the forming dentate pole to produce a lifelong neurogenic subgranular zone (SGZ). In this study, we demonstrate that dentate progenitors first dwell for up to 1 week in a previously unrecognized neurogenic zone intimately associated with the pial meningeal surface lining the outer edge of the forming dentate. This zone also serves as the organizational matrix for the initial formation of the dentate glial scaffolding. Timely clearance of neural precursors from their transient location depends on reelin, whereas initial formation of this transient stem cell niche requires Cxcl12-Cxcr4 signaling. The final settlement of the neural precursors at the subgranular zone relies on a pertussis toxin-sensitive pathway independent of Cxcl12-Cxcr4 signaling. Furthermore, genetic fate-mapping analysis suggests that subpial precursors contribute to the SGZ formation. These results demonstrate that the relocation of neural precursors in the dentate gyrus consists of discrete steps regulated by multiple pathways.

Key words: Dentate gyrus, Meninges, Neurogenesis


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