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Auditory ganglion source of Sonic hedgehog regulates timing of cell cycle exit and differentiation of mammalian cochlear hair cells.
- Source :
-
Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2013 Aug 20; Vol. 110 (34), pp. 13869-74. Date of Electronic Publication: 2013 Aug 05. - Publication Year :
- 2013
-
Abstract
- Neural precursor cells of the central nervous system undergo successive temporal waves of terminal division, each of which is soon followed by the onset of cell differentiation. The organ of Corti in the mammalian cochlea develops differently, such that precursors at the apex are the first to exit from the cell cycle but the last to begin differentiating as mechanosensory hair cells. Using a tissue-specific knockout approach in mice, we show that this unique temporal pattern of sensory cell development requires that the adjacent auditory (spiral) ganglion serve as a source of the signaling molecule Sonic hedgehog (Shh). In the absence of this signaling, the cochlear duct is shortened, sensory hair cell precursors exit from the cell cycle prematurely, and hair cell differentiation closely follows cell cycle exit in a similar apical-to-basal direction. The dynamic relationship between the restriction of Shh expression in the developing spiral ganglion and its proximity to regions of the growing cochlear duct dictates the timing of terminal mitosis of hair cell precursors and their subsequent differentiation.<br />Competing Interests: The authors declare no conflict of interest.
- Subjects :
- Animals
Deoxyuridine analogs & derivatives
In Situ Hybridization
In Situ Nick-End Labeling
Mice
Organ of Corti cytology
Cell Cycle Checkpoints physiology
Cell Differentiation physiology
Hair Cells, Auditory physiology
Hedgehog Proteins metabolism
Morphogenesis physiology
Organ of Corti embryology
Spiral Ganglion metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1091-6490
- Volume :
- 110
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Type :
- Academic Journal
- Accession number :
- 23918393
- Full Text :
- https://doi.org/10.1073/pnas.1222341110