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Neuron. 2005 Sep 1;47(5):653-66.

Assembly of trigeminal sensory ganglia by chemokine signaling.

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  • 1Developmental Genetics Program, Skirball Institute of Biomolecular Medicine, and Department of Cell Biology, New York University School of Medicine, New York, New York 10016, USA. knaut@saturn.med.nyu.edu

Abstract

Sensory neurons with related functions form ganglia, but how these precisely positioned clusters are assembled has been unclear. Here, we use the zebrafish trigeminal sensory ganglion as a model to address this question. We find that some trigeminal sensory neurons are born at the position where the ganglion is assembled, whereas others are born at a distance and have to migrate against opposing morphogenetic movements to reach the site of ganglion assembly. Loss of Cxcr4b-mediated chemokine signaling results in the formation of mispositioned ganglia. Conversely, ectopic sources of the chemokine SDF1a can attract sensory neurons. Transplantation experiments reveal that neuron-neuron interaction and the adhesion molecules E- and N-Cadherin also contribute to ganglion assembly. These results indicate that ganglion formation depends on the interplay of birthplace, chemokine attraction, cell-cell interaction, and cadherin-mediated adhesion.

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PMID:
16129396
[PubMed - indexed for MEDLINE]
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