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Evolutionary divergence of trigeminal nerve somatotopy in amniotes.
MedLine Citation:
PMID:  23047619     Owner:  NLM     Status:  Publisher    
The trigeminal circuit relays somatosensory input from the face into the central nervous system. In central nuclei, the spatial arrangement of neurons reproduces the physical distribution of peripheral receptors thus generating a somatotopic facial map during development. In mice, the ophthalmic, maxillary and mandibular trigeminal nerve branches maintain a somatotopic segregation and generate spatially organized patterns of connectivity within hindbrain target nuclei. To investigate conservation of somatotopic organisation, we compared trigeminal nerve organization in turtle, chick, and mouse embryos. We found that, in the turtle, mandibular and maxillary ganglion neuron rostrocaudal segregation and trigeminal tract somatotopy are similar to mouse. In contrast, chick mandibular ganglion neurons are located rostrally to maxillary neurons, with some intermingling, supporting previous observations (Noden, 1980, J Comp Neurol 190:429-444). This organization results in an inversion of the relative positions and less precise axonal sorting of the maxillary and mandibular branches within the trigeminal tract, as compared to mouse and turtle. Moreover, using the turtle and chick orthologues of Drg11 in combination with Hoxa2 expression and axonal tracings from the periphery, we mapped the chick PrV nucleus position to rhombomere 1, confirming previous studies (Marin and Puelles, 1995, Eur J Neurosci 7:1714-1738) and in contrast to mouse PrV, which mainly maps to rhombomere 2-3 (Oury et al., 2006, Science 313:1408-1413). Thus, somatotopy of trigeminal ganglion and nerve organization is only partially conserved through amniote evolution, possibly in relation to the modification of facial somatosensory structures and morphologies. J. Comp. Neurol., 2012. © 2012 Wiley Periodicals, Inc.
Muriel Rhinn; Kanako Miyoshi; Aki Watanabe; Masahumi Kawaguchi; Fumihiro Ito; Shigeru Kuratani; Clare V H Baker; Yasunori Murakami; Filippo M Rijli
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-10
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  -     ISSN:  1096-9861     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Institut de Génétique et de Biologie Moléculaire et Cellulaire, UMR 7104, Strasbourg, France.
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