title: Overlapping and non-overlapping Ptch2 expression with Shh during mouse embryogenesis.
abstract: In Drosophila, patched encodes a negative regulator of Hedgehog signaling. Biochemical experiments have demonstrated that vertebrate patched homologues might function as a Sonic hedgehog (Shh) receptor. In mice, two patched homologues, Ptch and Ptch2, have been identified. Sequence comparison have suggested that they might possess distinct properties in Shh signaling. In the developing tooth, hair and whisker, Shh and Ptch2 are co-expressed in the epithelium while Ptch is strongly expressed in the mesenchymal cells. We report here the chromosomal localization of Ptch2 and further analysis of Ptch2 expression. Throughout mouse development, the level of Ptch2 expression is significantly lower than that of Ptch. In early mouse embryos, Ptch and Ptch2 were found to be co-expressed in regions adjacent to Shh-expressing cells in the developing CNS. Similar to other epidermal structures, Shh and Ptch2 also show overlapping expression in the developing nasal gland and eyelids. Thus, during mouse development, Ptch2 is expressed in both Shh-producing and -nonproducing cells.
authors.affiliation: Program in Developmental Biology, Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, Ont. M5G 1X8, Canada. motoyama@sickkids.on.ca
authors.forename: J
authors.initials: J
authors.lastname: Motoyama
authors.forename: H
authors.initials: H
authors.lastname: Heng
authors.forename: M A
authors.initials: MA
authors.lastname: Crackower
authors.forename: T
authors.initials: T
authors.lastname: Takabatake
authors.forename: K
authors.initials: K
authors.lastname: Takeshima
authors.forename: L C
authors.initials: LC
authors.lastname: Tsui
authors.forename: C
authors.initials: C
authors.lastname: Hui
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D005314:Embryonic and Fetal Development / Q000235:genetics*; D004817:Epidermis / Q000196:embryology / Q000378:metabolism; D004848:Epithelium / Q000196:embryology / Q000378:metabolism; D005143:Eyelids / Q000196:embryology / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D053823:Hedgehog Proteins; D017404:In Situ Hybridization, Fluorescence; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D008648:Mesoderm / Q000378:metabolism; D051379:Mice; D009297:Nasal Mucosa / Q000378:metabolism; D009666:Nose / Q000196:embryology; D009928:Organ Specificity; D000072079:Patched Receptors; D000072081:Patched-1 Receptor; D000072082:Patched-2 Receptor; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D011956:Receptors, Cell Surface; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015534:Trans-Activators
chemical_list: D053823:Hedgehog Proteins; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D000072079:Patched Receptors; D000072081:Patched-1 Receptor; D000072082:Patched-2 Receptor; D011506:Proteins; C000606240:Ptch1 protein, mouse; C000606241:Ptch2 protein, mouse; D011956:Receptors, Cell Surface; D015534:Trans-Activators