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An activated Notch receptor blocks cell-fate commitment in the developing Drosophila eye

Nature volume 365, pages 555–557 (1993)Cite this article

Abstract

THE Notch locus of Drosophila melanogaster encodes a 2,703-amino-acid transmembrane protein required for a variety of developmental processes, including neurogenesis, oogenesis and ommatidial assembly1,2. The Notch protein contains a large extracellular domain of 36 epidermal growth factor-like repeats as well as three Notch/Lin-12 repeats and an intracellular domain with 6 CdclO/ ankyrin repeats, motifs that are highly conserved in several vertebrate Notch homologues3–9. Truncation of the extracellular domain of the Drosophila Notch protein produces an activated receptor, as judged by its ability to cause phenotypes similar to gain-of-function alleles or duplications of the Notch locus10. Equivalent truncations of vertebrate Notch-related proteins have been associated with malignant neoplasms and other developmental abnormalities8,11–13. We present here an analysis of activated Notch function at single-cell resolution in the Drosophila compound eye. We find that overexpression of full-length Notch in defined cell types has no apparent effects but that overexpression of activated Notch in the same cells transiently blocks their proper cell-fate commitment, causing them either to adopt incorrect cell fates or to differentiate incompletely. Moreover, an activated Notch protein lacking the transmembrane domain is translocated to the nucleus, raising the possibility that Notch may participate directly in nuclear events.

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Authors and Affiliations

  1. Departments of Cell Biology and Biology, and Howard Hughes Medical Institute, Yale University, New Haven, Connecticut, 06536, USA

    Mark E. Fortini, Ilaria Rebay, Laurent A. Caron & Spyros Artavanis-Tsakonas

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  1. Mark E. Fortini
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  2. Ilaria Rebay
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  3. Laurent A. Caron
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  4. Spyros Artavanis-Tsakonas
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Fortini, M., Rebay, I., Caron, L. et al. An activated Notch receptor blocks cell-fate commitment in the developing Drosophila eye. Nature 365, 555–557 (1993). https://doi.org/10.1038/365555a0

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