title: OC29 is preferentially expressed in the presumptive sensory organ region of the otocyst.
abstract: The mammalian inner ear derives from the otocyst. Molecular mechanisms underlying inner ear development are largely unknown. We have isolated a secreted molecule, OC29, from a rat otocyst cDNA library by the signal sequence trap method. OC29 was revealed to be a rat homologue of human WFIKKN. OC29 is preferentially expressed in the developing inner ear and the dorsal neural tube. In the inner ear, the expression of OC29 is first detectable at embryonic day 11.5 (E11.5), broadly in the dorsolateral region of the otocyst, which gives rise to the vestibular organ. At E12.5, the expression of OC29 becomes restricted to the presumptive sensory region, mainly to the BMP4-positive presumptive cristae, and expression becomes reduced at later stages. These results suggest that OC29 may have a role in the early development of the inner ear sensory organ, particularly in the formation of the cristae of the semicircular canals.
authors.affiliation: Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Akiko T
authors.initials: AT
authors.lastname: Nishida
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kobuke
authors.forename: Ken
authors.initials: K
authors.lastname: Kojima
authors.forename: Juichi
authors.initials: J
authors.lastname: Ito
authors.forename: Tasuku
authors.initials: T
authors.lastname: Honjo
authors.forename: Kei
authors.initials: K
authors.lastname: Tashiro
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D005260:Female; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D008969:Molecular Sequence Data; D011247:Pregnancy; D011506:Proteins / Q000235:genetics; D051381:Rats; D017208:Rats, Wistar; D014722:Vestibule, Labyrinth / Q000196:embryology* / Q000502:physiology*
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D011506:Proteins; C424444:WFIKKN2 protein, human; C499552:Wifkkn1 protein, rat