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First published online 20 October 2004
doi: 10.1242/dev.01436
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1 Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
2 Department of Anatomy, Jichi Medical School, Tochigi 329-0498, Japan
3 Kyoto University Graduate School of Medicine, Kyoto 606-8501, Japan
4 National Institute for Medical Research, Mill Hill, London, NW7 1AA, UK
Author for correspondence (e-mail:
rkageyam{at}virus.kyoto-u.ac.jp)
Accepted 9 September 2004
Radial glial cells derive from neuroepithelial cells, and both cell types are identified as neural stem cells. Neural stem cells are known to change their competency over time during development: they initially undergo self-renewal only and then give rise to neurons first and glial cells later. Maintenance of neural stem cells until late stages is thus believed to be essential for generation of cells in correct numbers and diverse types, but little is known about how the timing of cell differentiation is regulated and how its deregulation influences brain organogenesis. Here, we report that inactivation of Hes1 and Hes5, known Notch effectors, and additional inactivation of Hes3 extensively accelerate cell differentiation and cause a wide range of defects in brain formation. In Hes-deficient embryos, initially formed neuroepithelial cells are not properly maintained, and radial glial cells are prematurely differentiated into neurons and depleted without generation of late-born cells. Furthermore, loss of radial glia disrupts the inner and outer barriers of the neural tube, disorganizing the histogenesis. In addition, the forebrain lacks the optic vesicles and the ganglionic eminences. Thus, Hes genes are essential for generation of brain structures of appropriate size, shape and cell arrangement by controlling the timing of cell differentiation. Our data also indicate that embryonic neural stem cells change their characters over time in the following order: Hes-independent neuroepithelial cells, transitory Hes-dependent neuroepithelial cells and Hes-dependent radial glial cells.
Key words: Adherens junction, Basal lamina, bHLH, Neuroepithelium, Radial glia, Tight junction
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