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First published online 5 January 2005
doi: 10.1242/dev.01589
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Vertebrate Development Laboratory, Cancer Research UK, 44 Lincoln's Inn Fields, London WC2A 3PX, UK
* Author for correspondence (e-mail: julian.lewis{at}cancer.org.uk)
Accepted 9 November 2004
Lateral inhibition mediated by Notch is thought to generate the mosaic of hair cells and supporting cells in the inner ear, but the effects of the activated Notch protein itself have never been directly tested. We have explored the role of Notch signalling by transiently overexpressing activated Notch (NICD) in the chick otocyst. We saw two contrasting consequences, depending on the time and site of gene misexpression: (1) inhibition of hair-cell differentiation within a sensory patch; and (2) induction of ectopic sensory patches. We infer that Notch signalling has at least two functions during inner ear development. Initially, Notch activity can drive cells to adopt a prosensory character, defining future sensory patches. Subsequently, Notch signalling within each such patch mediates lateral inhibition, restricting the proportion of cells that differentiate as hair cells so as to generate the fine-grained mixture of hair cells and supporting cells.
Key words: Notch, Inner ear, Chick, Hair cells, Electroporation, Lateral inhibition, Prosensory determination
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