Abstract
Transcripts of notch and its target genes have been detected in some differentiating neurons. However, the role of Notch in neuronal differentiation remains poorly defined. Here, we show that a subset of differentiating sensory neurons in the trigeminal ganglia express her4. Expression of her4 requires Notch signaling during neurogenesis but not during differentiation, when peripheral projections of the trigeminal ganglia are established. These projections develop poorly in her4 morphants. While many components of the canonical Notch signaling pathway are not required for late her4 expression or peripheral axon outgrowth in trigeminal neurons, simultaneous knock-down of Notch receptors prevents establishment of these peripheral projections. These observations suggest that Her4 and Notch play a role in peripheral outgrowth of sensory neurons.
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