title: Drosophila MAP kinase kinase suppresses the vulvaless phenotype of lin-3, let-23 and lin-45 mutations in Caenorhabditis elegans.
abstract: The vulva of the nematode Caenorhabditis elegans develops from the three vulval precursor cells (VPCs) that are induced by a signal from the gonadal anchor cell. This signal is thought to be mediated by a receptor tyrosine kinase (RTK) in the VPCs to a downstream signal transduction pathway. A mitogen-activated protein kinase kinase (MAPKK) has been found to be one of the major components of an RTK pathway in other organisms. We expressed a wild type and an activated cDNA of Dsor1, a Drosophila MAPKK, in each of the three vulvaless mutants lin-3, let-23 and lin-45. The expression of an activated from of Dsor1 in each of the mutants effectively induced a normal, functional vulva, that is, suppressed the vulvaless phenotype. The wild type Dsor1 also suppressed albeit less effectively. These results suggest that a MAPKK is involved in the vulval induction of C. elegans.
authors.affiliation: Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Koga
authors.forename: Y
authors.initials: Y
authors.lastname: Ohshima
mesh_terms: D000818:Animals; D001483:Base Sequence; D017173:Caenorhabditis elegans / Q000235:genetics*; D004330:Drosophila / Q000201:enzymology*; D029721:Drosophila Proteins; D005260:Female; D005838:Genotype; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D011494:Protein Kinases / Q000502:physiology*; D015398:Signal Transduction / Q000235:genetics; D014844:Vulva / Q000002:abnormalities*
chemical_list: D029721:Drosophila Proteins; D011494:Protein Kinases; C119848:Dsor1 protein, Drosophila