DOI: 10.1242/dev.122.3.951. The Drosophila genes crumbs and stardust are involved in the biogenesis of adherens junctions

The Drosophila genes crumbs and stardust are involved in the biogenesis of adherens junctions

10.1242/dev.122.3.951

Crossref journal-article

The Company of Biologists

Development (237)

Abstract

ABSTRACT Morphogenetic movements of epithelia during development underlie the normal elaboration of the final body plan. The tissue integrity critical for these movements is conferred by anchorage of the cytoskeleton to the membrane at sites of cell adhesion, mediated by adherens junctions, initially spot and later belt-like, zonular structures, which encircle the apical side of the cell. Loss-offunction mutations in the Drosophila genes crumbs and stardust lead to the loss of cell polarity in most ectodermally derived epithelia, followed in some, such as the epidermis, by extensive apoptosis. Here we show that both mutants fail to establish proper zonulae adherentes in the epidermis. Our results suggest that the two genes are involved in different aspects of this process. Further, they are compatible with the hypothesis that crumbs delimits the apical border, where the zonula adherens usually forms and where Crumbs protein is normally most abundant. In contrast, stardust seems to be required at an earlier stage for the assembly of the spot adherens junctions. In both mutants, the defects observed at the ultrastructural level are preceded by a misdistribution of Armadillo and DEcadherin, the homologues of β-catenin and E-cadherin, respectively, which are two constituents of the vertebrate adherens junctions. Strikingly, expansion of the apical membrane domain in epidermal cells by overexpression of crumbs also abolishes the formation of adherens junctions and results in the disruption of tissue integrity, but without loss of membrane polarity. This result supports the view that membrane polarity is independent of the formation of adherens junctions in epidermal cells.

Bibliography

Grawe, F., Wodarz, A., Lee, B., Knust, E., & Skaer, H. (1996). The Drosophila genes crumbs and stardust are involved in the biogenesis of adherens junctions. Development, 122(3), 951â959.

Authors 5

Ferdi Grawe (first)
Andreas Wodarz (additional)
Bill Lee (additional)
Elisabeth Knust (additional)
Helen Skaer (additional)

References 43 Referenced 151

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Dates

Type	When
Created	4 years, 4 months ago (April 25, 2021, 10:37 p.m.)
Deposited	6 months, 2 weeks ago (Feb. 13, 2025, 5:38 p.m.)
Indexed	2 months, 1 week ago (June 19, 2025, 7:06 p.m.)
Issued	29 years, 5 months ago (March 1, 1996)
Published	29 years, 5 months ago (March 1, 1996)
Published Online	29 years, 5 months ago (March 1, 1996)
Published Print	29 years, 5 months ago (March 1, 1996)

Funders 0

None

BibTeX

@article{Grawe_1996, title={The Drosophila genes crumbs and stardust are involved in the biogenesis of adherens junctions}, volume={122}, ISSN={1477-9129}, url={http://dx.doi.org/10.1242/dev.122.3.951}, DOI={10.1242/dev.122.3.951}, number={3}, journal={Development}, publisher={The Company of Biologists}, author={Grawe, Ferdi and Wodarz, Andreas and Lee, Bill and Knust, Elisabeth and Skaer, Helen}, year={1996}, month=mar, pages={951–959} }

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  "abstract": "<jats:title>ABSTRACT</jats:title>\n               <jats:p>Morphogenetic movements of epithelia during development underlie the normal elaboration of the final body plan. The tissue integrity critical for these movements is conferred by anchorage of the cytoskeleton to the membrane at sites of cell adhesion, mediated by adherens junctions, initially spot and later belt-like, zonular structures, which encircle the apical side of the cell. Loss-offunction mutations in the Drosophila genes crumbs and stardust lead to the loss of cell polarity in most ectodermally derived epithelia, followed in some, such as the epidermis, by extensive apoptosis. Here we show that both mutants fail to establish proper zonulae adherentes in the epidermis. Our results suggest that the two genes are involved in different aspects of this process. Further, they are compatible with the hypothesis that crumbs delimits the apical border, where the zonula adherens usually forms and where Crumbs protein is normally most abundant. In contrast, stardust seems to be required at an earlier stage for the assembly of the spot adherens junctions. In both mutants, the defects observed at the ultrastructural level are preceded by a misdistribution of Armadillo and DEcadherin, the homologues of \u03b2-catenin and E-cadherin, respectively, which are two constituents of the vertebrate adherens junctions. Strikingly, expansion of the apical membrane domain in epidermal cells by overexpression of crumbs also abolishes the formation of adherens junctions and results in the disruption of tissue integrity, but without loss of membrane polarity. This result supports the view that membrane polarity is independent of the formation of adherens junctions in epidermal cells.</jats:p>",
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