The C. elegans ezrin-radixin-moesin protein ERM-1 is necessary for apical junction remodelling and tubulogenesis in the intestine

Developmental Biology
Daniela van FürdenOlaf Bossinger

Abstract

Members of the ezrin-radixin-moesin (ERM) family of proteins have been found to serve as linkers between membrane proteins and the F-actin cytoskeleton in many organisms. We used RNA interference (RNAi) approach to assay ERM proteins of the Caenorhabditis elegans genome for a possible involvement in apical junction (AJ) assembly or positioning. We identify erm-1 as the only ERM protein required for development and show, by multiple RNA interference, that additional four-point one, ezrin-radixin-moesin (FERM) domain-containing proteins cannot compensate for the depletion of ERM-1. ERM-1 is expressed in most if not all cells of the embryo at low levels but is upregulated in epithelia, like the intestine. ERM-1 protein co-localizes with F-actin and the intermediate filament protein IFB-2 at the apical cell cortex. ERM-1 depletion results in intestine-specific phenotypes like lumenal constrictions or even obstructions. This phenotype arises after epithelial polarization of intestinal cells and can be monitored using markers of the apical junction. We show that the initial steps of epithelial polarization in the intestine are not affected in erm-1(RNAi) embryos but the positioning of apical junction proteins to an apico-lateral posi...Continue Reading

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