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OC29 is preferentially expressed in the presumptive sensory organ region of the otocyst
Author(s) -
Nishida Akiko T.,
Kobuke Kazuhiro,
Kojima Ken,
Ito Juichi,
Honjo Tasuku,
Tashiro Kei
Publication year - 2004
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.20180
Subject(s) - inner ear , biology , anatomy , cochlea , vestibular system , membranous labyrinth , microbiology and biotechnology , organ of corti , embryonic stem cell , sensory system , neuroscience , genetics , gene
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. Developmental Dynamics 231:766–774, 2004. © 2004 Wiley‐Liss, Inc.