RRC ID 11100
Author Mao Y, Kucuk B, Irvine KD.
Title Drosophila lowfat, a novel modulator of Fat signaling.
Journal Development
Abstract The Fat-Hippo-Warts signaling network regulates both transcription and planar cell polarity. Despite its crucial importance to the normal control of growth and planar polarity, we have only a limited understanding of the mechanisms that regulate Fat. We report here the identification of a conserved cytoplasmic protein, Lowfat (Lft), as a modulator of Fat signaling. Drosophila Lft, and its human homologs LIX1 and LIX1-like, bind to the cytoplasmic domains of the Fat ligand Dachsous, the receptor protein Fat, and its human homolog FAT4. Lft protein can localize to the sub-apical membrane in disc cells, and this membrane localization is influenced by Fat and Dachsous. Lft expression is normally upregulated along the dorsoventral boundary of the developing wing, and is responsible for elevated levels of Fat protein there. Levels of Fat and Dachsous protein are reduced in lft mutant cells, and can be increased by overexpression of Lft. lft mutant animals exhibit a wing phenotype similar to that of animals with weak alleles of fat, and lft interacts genetically with both fat and dachsous. These studies identify Lft as a novel component of the Fat signaling pathway, and the Lft-mediated elevation of Fat levels as a mechanism for modulating Fat signaling.
Volume 136(19)
Pages 3223-33
Published 2009-10
DOI 10.1242/dev.036152
PII dev.036152
PMID 19710173
PMC PMC2739141
MeSH Amino Acid Sequence Animals Animals, Genetically Modified Base Sequence Binding Sites Cadherins / chemistry Cadherins / genetics Cadherins / physiology Cell Adhesion Molecules / chemistry Cell Adhesion Molecules / genetics Cell Adhesion Molecules / physiology* DNA Primers / genetics Drosophila / genetics Drosophila / growth & development Drosophila / physiology* Drosophila Proteins / chemistry Drosophila Proteins / genetics Drosophila Proteins / physiology* Female Gene Expression Regulation, Developmental Genes, Insect Humans Male Molecular Sequence Data Mutation Phenotype Protein Structure, Tertiary RNA-Binding Proteins / genetics RNA-Binding Proteins / physiology Recombinant Fusion Proteins / chemistry Recombinant Fusion Proteins / genetics Recombinant Fusion Proteins / physiology Sequence Homology, Amino Acid Signal Transduction Species Specificity Wings, Animal / growth & development Wings, Animal / metabolism
IF 5.413
Times Cited 36
Drosophila 13139R-1 3936R-3