CRUMBS is involved in the control of apical protein targeting during Drosophila epithelial development.

Abstract:

:The gene crumbs (crb) of Drosophila encodes a transmembrane protein with 30 EGF-like and four laminin A G-domain-like repeats in its extracellular domain. Loss-of-function mutations lead to severe disorganization and degeneration of ectodermally derived embryonic epithelia. In embryos homozygous for crb8F105, an amorphic allele, the CRUMBS protein is diffusely distributed in the cytoplasm instead of being apically localized as in wild-type; this mislocation occurs before any morphologically detectable cellular phenotype becomes manifest, suggesting that apical targeting of proteins is affected in crb mutant embryos. This has been confirmed by using an antibody directed against YELLOW, another apically expressed protein. A single base exchange in crb8F105 leads to the introduction of a premature stop codon, thus eliminating the C-terminal part of the cytoplasmic domain. A possible role for crb in controlling apical-basal polarity is discussed.

journal_name

Mech Dev

authors

Wodarz A,Grawe F,Knust E

doi

10.1016/0925-4773(93)90066-7

subject

Has Abstract

pub_date

1993-12-01 00:00:00

pages

175-87

issue

2-3

eissn

0925-4773

issn

1872-6356

pii

0925-4773(93)90066-7

journal_volume

44

pub_type

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