title: A homolog of Drosophila Notch expressed during mammalian development.
abstract: Drosophila Notch and the related Caenorhabditis elegans proteins lin-12 and glp-1 function as mediators of local cell-cell interactions required for cell-fate decisions during invertebrate development. To investigate the possibility that similar proteins play determinative roles during mammalian development, we isolated cDNA clones encoding rat Notch. The deduced amino acid sequence of this protein contains 36 epidermal growth factor (EGF)-like repeats, and is remarkably similar in both its extracellular and cytoplasmic domains to the sequence of Xenopus Xotch and Drosophila Notch. In the developing central nervous system, in situ hybridisation analyses revealed that Notch transcripts were dramatically restricted to the ventricular proliferative zones of embryonic neuroepithelia. Notch was also strongly expressed during development of non-neural tissues, such as hair follicles and tooth buds, whose correct differentiation requires epithelial-mesenchymal interactions. These data support the hypothesis that Notch plays an essential role in mammalian development and pattern formation that closely parallels its role in the development of invertebrates.
authors.affiliation: Molecular Neurobiology Laboratory, Salk Institute, San Diego, CA 92186.
authors.forename: G
authors.initials: G
authors.lastname: Weinmaster
authors.forename: V J
authors.initials: VJ
authors.lastname: Roberts
authors.forename: G
authors.initials: G
authors.lastname: Lemke
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D001923:Brain Chemistry; D004270:DNA, Circular / Q000235:genetics; D004330:Drosophila / Q000235:genetics*; D029721:Drosophila Proteins; D004622:Embryo, Mammalian / Q000737:chemistry; D004625:Embryo, Nonmammalian; D004627:Embryonic Induction / Q000235:genetics*; D015870:Gene Expression / Q000235:genetics*; D007301:Insect Hormones / Q000032:analysis / Q000235:genetics*; D008322:Mammals / Q000235:genetics*; D008565:Membrane Proteins / Q000032:analysis / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D051381:Rats; D051880:Receptors, Notch; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004270:DNA, Circular; D029721:Drosophila Proteins; D007301:Insect Hormones; D008565:Membrane Proteins; C497759:N protein, Drosophila; D051880:Receptors, Notch