http://www.ncbi.nlm.nih.gov/pubmed/18521945
Abstract
Canonical Wnt
signaling is crucial for the correct development of both cortical and
hippocampal structures in the dorsal telencephalon. In this study, we
examined the role of the canonical Wnt signaling in the dorsal
telencephalon of mouse embryos at defined time periods by inhibition of
the pathway with ectopic expression of Dkk1. Transgenic mice with the
D6-driven Dkk1 gene exhibited reduced canonical Wnt signaling in the
cortex and hippocampus. As a result, all hippocampal fields were reduced
in size. Neurogenesis in the dentate gyrus was severely reduced both in
the premigratory and migratory progenitor pool. The lower number of
progenitors in the dentate gyrus was not rescued after migration to the
subgranular zone and thus the dentate gyrus lacked the entire internal
blade and a part of the external blade from postnatal to adult stages.
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