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Published on: January 12, 2015
The Notch gene, adhesion, and developmental fate in the Drosophila embryo
1Department of Neurosciences, Roche Institute of Molecular Biology, Nutley, NJ 07110.
Abstract:
The Notch locus in Drosophila encodes a transmembrane protein required for the determination of cell fate in ectodermal cells. When these cells are faced with a choice of two possible fates, Notch enables some of them to advance from the fate that represents a "default" state. The decision appears to involve both an interaction between cells and the presence of the Notch product on the surface of those advancing from the default state. The timing of gene action suggests that Notch plays a role in the stabilization of the choice of cell fate and that the Notch-mediated interaction occurs between presumptive epidermal cells. Several properties of the Notch product are characteristic of an adhesion molecule, and thus cell adhesion may play a role in the determination of cell fate.
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The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...