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. 1991 Jan 15;88(2):632–636. doi: 10.1073/pnas.88.2.632

Cell-autonomous role of Notch, an epidermal growth factor homologue, in sensory organ differentiation in Drosophila.

J F de Celis 1, M Marí-Beffa 1, A García-Bellido 1
PMCID: PMC50866  PMID: 1899143

Abstract

The gene Notch (N) codes for a transmembrane protein with an extracellular domain that has homologies to epidermal growth factors and an intracellular domain that could be involved in signal transduction. N null alleles cause the transformation of most epidermal cells into neuroblasts in central and peripheral nervous systems. Alleles of the same gene, called Abruptex (Ax), that map to the extracellular domain of N protein cause the absence of adult sensory organs. Both types of alleles show cell autonomy in mosaic analysis carried out in the last stages of the formation of adult sensory organs. The phenotypes are different: cells lacking N gene products differentiate as sensory organ mother cells early and as its neural sublineage later, whereas in the homozygous Ax condition epidermal cells do not enter the sensory organ mother cell pathway. The results indicate that N gene products act internally in the cell, probably as receptors of intercellular signals both in sensory organ mother cell singularization and in fate specification of its daughter cells. Ax mutations behave as an excess of N+ function in this signal transduction process. N proteins modified by these mutations act as constitutively activated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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