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- W2051622265 abstract "Hearing requires an optimal afferent innervation of sensory hair cells by spiral ganglion neurons in the cochlea. Here we report that complementary expression of ephrin-A5 in hair cells and EphA4 receptor among spiral ganglion neuron populations controls the targeting of type I and type II afferent fibres to inner and outer hair cells, respectively. In the absence of ephrin-A5 or EphA4 forward signalling, a subset of type I projections aberrantly overshoot the inner hair cell layer and invade the outer hair cell area. Lack of type I afferent synapses impairs neurotransmission from inner hair cells to the auditory nerve. By contrast, radial shift of type I projections coincides with a gain of presynaptic ribbons that could enhance the afferent signalling from outer hair cells. Ephexin-1, cofilin and myosin light chain kinase act downstream of EphA4 to induce type I spiral ganglion neuron growth cone collapse. Our findings constitute the first identification of an Eph/ephrin-mediated mutual repulsion mechanism responsible for specific sorting of auditory projections in the cochlea. Cochlear inner and outer hair cells receive afferent innervation from type I and type II spiral ganglion neurons, respectively. Defourny et al. find that, in the absence of ephrin-A5 and its receptor EphA4, a subset of type I spiral ganglion neuron projections invade the outer hair cell area." @default.
- W2051622265 created "2016-06-24" @default.
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- W2051622265 date "2013-02-05" @default.
- W2051622265 modified "2023-10-09" @default.
- W2051622265 title "Ephrin-A5/EphA4 signalling controls specific afferent targeting to cochlear hair cells" @default.
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- W2051622265 doi "https://doi.org/10.1038/ncomms2445" @default.
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