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First published online 16 January 2008
doi: 10.1242/dev.016386

Development 135, 707-715 (2008)
Published by The Company of Biologists 2008
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Loss of seven-up from Drosophila R1/R6 photoreceptors reveals a stochastic fate choice that is normally biased by Notch

Adam C. Miller, Heather Seymour, Christopher King and Tory G. Herman*

Institute of Molecular Biology, University of Oregon, 1370 Franklin Blvd, Eugene, OR 97403, USA.

* Author for correspondence (e-mail: herman{at}molbio.uoregon.edu)

Accepted 28 November 2007

Recent evidence suggests that stochasticism is important for generating cell type diversity. We have identified a novel stochastic fate choice as part of the mechanism by which Delta/Notch (Dl/N) signaling specifies R7 fate in the Drosophila eye. The equivalence of R1/R6/R7 precursors is normally broken by the activation of N, which specifies the R7 fate. The orphan nuclear hormone receptor Seven-up (Svp) is necessary and sufficient to direct R1/R6/R7 precursors to adopt the R1/R6 fate. A simple model, therefore, is that N represses Svp, which otherwise prevents adoption of the R7 fate. However, we have found that R1/R6s lacking svp stochastically adopt either the R7 or the R8 fate with equal likelihood. We show that N specifies the R7 fate by a novel branched pathway: N represses Svp expression, thereby exposing an underlying stochastic choice between the R7 and R8 fates, and then tips this choice towards the R7 fate.

Key words: Stochastic, Seven-up, Notch, Photoreceptor, Drosophila


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Stochastic fates tipped by Notch

Development 2008 135: e404. [Full Text]  



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