Ependymal cells are part of the neurogenic niche in the adult subventricular zone of the lateral ventricles, where they regulate neurogenesis and neuroblast migration. Ependymal cells are generated from radial glia cells during embryonic brain development and acquire their final characteristics postnatally. The homeobox gene Six3 is expressed in ependymal cells during the formation of the lateral wall of the lateral ventricles in the brain. Here, we show that Six3 is necessary for ependymal cell maturation during postnatal stages of brain development. In its absence, ependymal cells fail to suppress radial glia characteristics, resulting in a defective lateral wall, abnormal neuroblast migration and differentiation, and hydrocephaly.
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