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Development, Vol 127, Issue 13 2933-2943, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
S Bae, Y Bessho, M Hojo and R Kageyama
Institute for Virus Research, Kyoto University, Shogoin-Kawahara, Sakyo-ku, Kyoto 606-8507, Japan.
We have isolated the basic helix-loop-helix (bHLH) gene Hes6, a novel member of the family of mammalian homologues of Drosophila hairy and Enhancer of split. Hes6 is expressed by both undifferentiated and differentiated cells, unlike Hes1, which is expressed only by the former cells. Hes6 alone does not bind to the DNA but suppresses Hes1 from repressing transcription. In addition, Hes6 suppresses Hes1 from inhibiting Mash1-E47 heterodimer and thereby enables Mash1 and E47 to upregulate transcription in the presence of Hes1. Furthermore, misexpression of Hes6 with retrovirus in the developing retina promotes rod photoreceptor differentiation, like Mash1, in sharp contrast to Hes1, which inhibits cell differentiation. These results suggest that Hes6 is an inhibitor of Hes1, supports Mash1 activity and promotes cell differentiation. Mutation analysis revealed that Hes1- and Hes6-specific functions are, at least in part, interchangeable by alteration of the loop region, suggesting that the loop is not simply a nonfunctional spacer but plays an important role in the specific functions.
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