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Development ePress online publication date 14 Jul 2004
doi: 10.1242/dev.01258

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Research article

Localized Notch signal acts through eyg and upd to promote global growth in Drosophila eye


Ju-Lan Chao, Yu-Chen Tsai, Sue-Jean Chiu, and Y. Henry Sun*
* Author for correspondence (e-mail: mbyhsun{at}ccvax.sinica.edu.tw)

Notch (N) signal is activated at the dorsoventral (DV) border of the Drosophila eye disc and is important for growth of the eye disc. In this study, we showed that the Pax protein Eyg is a major effector mediating the growth promotion function of N. eyg transcription is induced by N signaling occurring at the DV border. Like N, eyg controls growth of the eye disc. Loss of N signaling can be compensated by overexpressing eyg, whereas loss of the downstream eyg blocked the function of N signaling. In addition, we showed that N and eyg could induce expression of upd, which encodes the ligand for the Jak/STAT pathway and acts over long distance to promote cell proliferation. Loss of eyg or N can be compensated by overexpressing upd. These results suggest that upd is a major effector mediating the function of eyg and N. The functional link from N to eyg to upd explains how the localized Notch activation can achieve global growth control.
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