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Genetics, Vol 136, 183-194, Copyright © 1994
INVESTIGATIONS |
Modifications of the Notch Function by Abruptex Mutations in Drosophila melanogaster
J. F. de-Celis and A. Garcia-Bellido
Present address: Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, England.
The function of the Notch gene is required in cell interactions defining alternative cell fates in several developmental processes. The Notch gene encodes a transmembrane protein with 36 epidermal growth factor (EGF)-like repeats in its extracellular domain. This protein functions as a receptor that interacts with other transmembrane proteins, such as Serrate and Delta, which also have EGF repeats in their extracellular domain. The Abruptex mutations of the Notch locus are associated with amino acid substitutions in the EGF repeats 24-29 of the Notch protein. We have studied, in genetic combinations, the modifications of Notch function caused by Abruptex mutations. These mutations lead to phenotypes which are opposite to those caused by Notch deletions. The Abruptex phenotypes are modified by the presence of mutations in other loci, in particular in the genes Serrate and Delta as well as Hairless, and groucho. The results suggest that all Abruptex mutations cause stronger than normal Notch activation by the Delta protein. Some Abruptex alleles also display an insufficiency of N function. Abruptex alleles which produce stronger enhancement of Notch activation also display stronger Notch insufficiency. This insufficiency could be due to reduced ability of Abruptex proteins to interact with Notch ligands and/or to form functional Notch dimers.
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