RRC ID 57284
Author Chen J, Sayadian AC, Lowe N, Lovegrove HE, St Johnston D.
Title An alternative mode of epithelial polarity in the Drosophila midgut.
Journal PLoS Biol.
Abstract Apical-basal polarity is essential for the formation and function of epithelial tissues, whereas loss of polarity is a hallmark of tumours. Studies in Drosophila have identified conserved polarity factors that define the apical (Crumbs, Stardust, Par-6, atypical protein kinase C [aPKC]), junctional (Bazooka [Baz]/Par-3), and basolateral (Scribbled [Scrib], Discs large [Dlg], Lethal [2] giant larvae [Lgl]) domains of epithelial cells. Because these conserved factors mark equivalent domains in diverse types of vertebrate and invertebrate epithelia, it is generally assumed that this system underlies polarity in all epithelia. Here, we show that this is not the case, as none of these canonical factors are required for the polarisation of the endodermal epithelium of the Drosophila adult midgut. Furthermore, like vertebrate epithelia but not other Drosophila epithelia, the midgut epithelium forms occluding junctions above adherens junctions (AJs) and requires the integrin adhesion complex for polarity. Thus, Drosophila contains two types of epithelia that polarise by fundamentally different mechanisms. This diversity of epithelial types may reflect their different developmental origins, junctional arrangement, or whether they polarise in an apical-basal direction or vice versa. Since knock-outs of canonical polarity factors in vertebrates often have little or no effect on epithelial polarity and the Drosophila midgut shares several common features with vertebrate epithelia, this diversity of polarity mechanisms is likely to be conserved in other animals.
Volume 16(10)
Pages e3000041
Published 2018-10
DOI 10.1371/journal.pbio.3000041
PII PBIOLOGY-D-18-00342
PMID 30339698
PMC PMC6209374
MeSH Animals Animals, Genetically Modified Body Patterning Cell Polarity Digestive System / cytology Digestive System / growth & development Digestive System / metabolism Drosophila Proteins / genetics Drosophila Proteins / metabolism Drosophila melanogaster / cytology Drosophila melanogaster / genetics Drosophila melanogaster / growth & development* Epithelial Cells / cytology Epithelial Cells / metabolism Epithelium / growth & development Epithelium / metabolism Female Genes, Insect Intercellular Junctions / metabolism Models, Biological
IF 9.163
Resource
Drosophila DGRC#115524 DGRC#115611 DGRC#114660