Quick Search:

uzh logo
Browse by:

Zurich Open Repository and Archive

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-2438

Haecker, A; Bergman, M; Neupert, C; Moussian, B; Luschnig, S; Aebi, M; Mannervik, M (2008). Wollknäuel is required for embryo patterning and encodes the Drosophila ALG5 UDP-glucose:dolichyl-phosphate glucosyltransferase. Development, 135(10):1745-1749.

View at publisher


N-linked glycosylation is a prevalent protein modification in eukaryotic cells. Although glycosylation plays an important role in cell signaling during development, a role for N-linked glycosylation in embryonic patterning has not previously been described. In a screen for maternal factors involved in embryo patterning, we isolated mutations in Drosophila ALG5, a UDP-glucose:dolichyl-phosphate glucosyltransferase. Based on the embryonic cuticle phenotype, we designated the ALG5 locus wollknäuel (wol). Mutations in wol result in posterior segmentation phenotypes, reduced Dpp signaling, as well as impaired mesoderm invagination and germband elongation at gastrulation. The segmentation phenotype can be attributed to a post-transcriptional effect on expression of the transcription factor Caudal, whereas wol acts upstream of Dpp signaling by regulating dpp expression. The wol/ALG5 cDNA was able to partially complement the hypoglycosylation phenotype of alg5 mutant S. cerevisiae, whereas the two wol mutant alleles failed to complement. We show that reduced glycosylation in wol mutant embryos triggers endoplasmic reticulum stress and the unfolded protein response (UPR). As a result, phosphorylation of the translation factor eIF2alpha is increased. We propose a model in which translation of a few maternal mRNAs, including caudal, are particularly sensitive to increased eIF2alpha phosphorylation. According to this view, inappropriate UPR activation can cause specific patterning defects during embryo development.


11 citations in Web of Science®
10 citations in Scopus®
Google Scholar™



0 downloads since deposited on 28 Apr 2008
8 downloads since 12 months

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Molecular Life Sciences
Dewey Decimal Classification:570 Life sciences; biology
Date:9 April 2008
Deposited On:28 Apr 2008 09:19
Last Modified:05 Apr 2016 12:23
Publisher:Company of Biologists
Additional Information:Free full text article
Publisher DOI:10.1242/dev.020891
PubMed ID:18403407

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page