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Dynamic expression pattern of Sonic hedgehog in developing cochlear spiral ganglion neurons
Author(s) -
Liu Zhiyong,
Owen Thomas,
Zhang Lingli,
Zuo Jian
Publication year - 2010
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.22302
Subject(s) - spiral ganglion , sonic hedgehog , biology , microbiology and biotechnology , ganglion , cochlea , embryonic stem cell , anatomy , signal transduction , gene , genetics
Sonic hedgehog (Shh) signaling plays important roles in the formation of the auditory epithelium. However, little is known about the detailed expression pattern of Shh and the cell sources from which Shh is secreted. By analyzing Shh CreEGFP/+ mice, we found that Shh was first expressed in all cochlear spiral ganglion neurons by embryonic day 13.5, after which its expression gradually decreased from base to apex. By postnatal day 0, it was not detected in any spiral ganglion neurons. Genetic cell fate mapping results also confirmed that Shh was exclusively expressed in all spiral ganglion neurons and not in surrounding glia cells. The basal‐to‐apical wave of Shh decline strongly resembles that of hair cell differentiation, supporting the idea that Shh signaling inhibits hair cell differentiation. Furthermore, this Shh CreEGFP/+ mouse is a useful Cre line in which to delete floxed genes specifically in spiral ganglion neurons of the developing cochlea. Developmental Dynamics 239:1674–1683, 2010. © 2010 Wiley‐Liss, Inc.