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Publication : Hearing loss in a mouse model of Muenke syndrome.

First Author  Mansour SL Year  2009
Journal  Hum Mol Genet Volume  18
Issue  1 Pages  43-50
PubMed ID  18818193 Mgi Jnum  J:143356
Mgi Id  MGI:3826730 Doi  10.1093/hmg/ddn311
Citation  Mansour SL, et al. (2009) Hearing loss in a mouse model of Muenke syndrome. Hum Mol Genet 18(1):43-50
abstractText  The heterozygous Pro250Arg substitution mutation in fibroblast growth factor receptor 3 (FGFR3), which increases ligand-dependent signalling, is the most common genetic cause of craniosynostosis in humans and defines Muenke syndrome. Since FGF signalling plays dosage-sensitive roles in the differentiation of the auditory sensory epithelium, we evaluated hearing in a large group of Muenke syndrome subjects, as well as in the corresponding mouse model (Fgfr3(P244R)). The Muenke syndrome cohort showed significant, but incompletely penetrant, predominantly low-frequency sensorineural hearing loss, and the Fgfr3(P244R) mice showed dominant, fully penetrant hearing loss that was more severe than that in Muenke syndrome individuals, but had the same pattern of relative high-frequency sparing. The mouse hearing loss correlated with an alteration in the fate of supporting cells (Deiters'-to-pillar cells) along the entire length of the cochlear duct, with the most extreme abnormalities found at the apical or low-frequency end. In addition, there was excess outer hair cell development in the apical region. We conclude that low-frequency sensorineural hearing loss is a characteristic feature of Muenke syndrome and that the genetically equivalent mouse provides an excellent model that could be useful in testing hearing loss therapies aimed at manipulating the levels of FGF signalling in the inner ear.
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