Retrograde BMP signaling regulates trigeminal sensory neuron identities and the formation of precise face maps.

Published

Journal Article

Somatosensory information from the face is transmitted to the brain by trigeminal sensory neurons. It was previously unknown whether neurons innervating distinct areas of the face possess molecular differences. We have identified a set of genes differentially expressed along the dorsoventral axis of the embryonic mouse trigeminal ganglion and thus can be considered trigeminal positional identity markers. Interestingly, establishing some of the spatial patterns requires signals from the developing face. We identified bone morphogenetic protein 4 (BMP4) as one of these target-derived factors and showed that spatially defined retrograde BMP signaling controls the differential gene expressions in trigeminal neurons through both Smad4-independent and Smad4-dependent pathways. Mice lacking one of the BMP4-regulated transcription factors, Onecut2 (OC2), have defects in the trigeminal central projections representing the whiskers. Our results provide molecular evidence for both spatial patterning and retrograde regulation of gene expression in sensory neurons during the development of the somatosensory map.

Full Text

Duke Authors

Cited Authors

  • Hodge, LK; Klassen, MP; Han, B-X; Yiu, G; Hurrell, J; Howell, A; Rousseau, G; Lemaigre, F; Tessier-Lavigne, M; Wang, F

Published Date

  • August 2007

Published In

Volume / Issue

  • 55 / 4

Start / End Page

  • 572 - 586

PubMed ID

  • 17698011

Pubmed Central ID

  • 17698011

Electronic International Standard Serial Number (EISSN)

  • 1097-4199

International Standard Serial Number (ISSN)

  • 0896-6273

Digital Object Identifier (DOI)

  • 10.1016/j.neuron.2007.07.010

Language

  • eng