title: Genetic link between beta-sarcoglycan and the Egfr signaling pathway.
abstract: Sarcoglycans are a multimeric, integral membrane protein complex that is part of the dystrophin glycoprotein complex. Previous findings suggest that the dystrophin glycoprotein complex plays roles not only in maintaining the mechanical structure of the cell membrane but also in signal transduction. To evaluate the functions of sarcoglycans, we here took advantage of Drosophila, which is useful for screening genetic interactions. Morphological aberrancy was observed in the adult compound eyes of Drosophila beta-sarcolgycan (dscgbeta) knockdown flies. We also detected genetic interactions between dscgbeta and Egfr related genes, such as rhomboid-1, rhomboid-3, and mirror. Furthermore two extra cell types with strong expression of Rhomboid were found in the ommatidia of dscgbeta knockdown pupal retina. These cells exhibited phosphorylation of ERKA, suggesting that Egfr signaling is activated via Rhomboid. Through these in vivo analyses, we conclude that dscgbeta negatively regulates the Egfr signaling pathway.
authors.affiliation: Department of Applied Biology and Insect Biomedical Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
authors.forename: Reina
authors.initials: R
authors.lastname: Hashimoto
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Yamaguchi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D030801:Animals, Genetically Modified; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism*; D018628:Gene Dosage; D005786:Gene Expression Regulation; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism*; D018010:Receptors, Invertebrate Peptide / Q000235:genetics / Q000378:metabolism*; D012160:Retina / Q000502:physiology; D049031:Sarcoglycans / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D015398:Signal Transduction / Q000235:genetics*
chemical_list: D029721:Drosophila Proteins; D008565:Membrane Proteins; D018010:Receptors, Invertebrate Peptide; C081481:Rho protein, Drosophila; D049031:Sarcoglycans; D011494:Protein Kinases; C066532:Egfr protein, Drosophila; D066246:ErbB Receptors