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First published online 28 February 2007
doi: 10.1242/dev.000786

Development 134, 1243-1251 (2007)
Published by The Company of Biologists 2007
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Primer

The Hes gene family: repressors and oscillators that orchestrate embryogenesis

Ryoichiro Kageyama*, Toshiyuki Ohtsuka and Taeko Kobayashi

Institute for Virus Research, Kyoto University and Japan Science and Technology Agency, CREST, Kyoto 606-8507, Japan.

* Author for correspondence (e-mail: rkageyam{at}virus.kyoto-u.ac.jp)

SUMMARY

Embryogenesis involves orchestrated processes of cell proliferation and differentiation. The mammalian Hes basic helix-loop-helix repressor genes play central roles in these processes by maintaining progenitor cells in an undifferentiated state and by regulating binary cell fate decisions. Hes genes also display an oscillatory expression pattern and control the timing of biological events, such as somite segmentation. Many aspects of Hes expression are regulated by Notch signaling, which mediates cell-cell communication. This primer describes these pleiotropic roles of Hes genes in some developmental processes and aims to clarify the basic mechanism of how gene networks operate in vertebrate embryogenesis.




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