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Ryk is expressed in a differentiation-specific manner in epithelial tissues and is strongly induced in decidualizing uterine stroma Serfas MS; Tyner ALOncogene 1998[Dec]; 17 (26): 3435-44Ryk is a ubiquitously expressed tyrosine kinase-like receptor of unknown activity and associations. We examined ryk expression in adult mouse epithelial tissues and during embryonic development at the histological level. Ryk RNA is present at greatly increased levels in cells at particular stages of epithelial differentiation: the basal layer of skin and tongue epithelia, the intervillous layer and some crypt bases of the intestine and the lower matrix region of the hair follicle. Although ryk RNA is expressed at similar levels in a variety of tissues from embryonic day 10.5 to 18.5, specific induction of ryk RNA can be seen by in situ hybridization in the basal layer of skin and hair follicle at day 15.5-16.5, and protein staining localizes to the hair follicle by immunohistochemistry. At day 4.5 and 6.5, little if any ryk is present in the blastocyst, but it is transiently induced at a high level in mature decidual cells of the uterine stroma. We review a number of independent isolations of ryk, including fruit fly and nematode members of the ryk family. Because ryk is induced in epithelial cells seeking a final place in a differentiated tissue, or during remodeling of the endometrium, and a homologous gene, derailed, is known to regulate muscle and nerve target seeking in Drosophila, ryk may also be involved in cellular recognition of appropriate context.|*Gene Expression Regulation, Developmental[MESH]|Amino Acid Sequence[MESH]|Animals[MESH]|Cell Differentiation/genetics[MESH]|Decidua/embryology/metabolism[MESH]|Epithelial Cells/*metabolism[MESH]|Female[MESH]|Mice[MESH]|Molecular Sequence Data[MESH]|Organ Specificity[MESH]|Receptor Protein-Tyrosine Kinases/*genetics/*metabolism[MESH]|Receptors, Cell Surface/*genetics/*metabolism[MESH]|Sequence Homology, Amino Acid[MESH]|Uterus/cytology/*embryology/metabolism[MESH] |
