Title |
Ancient origin of somatic and visceral neurons
|
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Published in |
BMC Biology, April 2013
|
DOI | 10.1186/1741-7007-11-53 |
Pubmed ID | |
Authors |
Marc Nomaksteinsky, Stefan Kassabov, Zoubida Chettouh, Henri-Corto Stoeklé, Laure Bonnaud, Gilles Fortin, Eric R Kandel, Jean-François Brunet |
Abstract |
A key to understanding the evolution of the nervous system on a large phylogenetic scale is the identification of homologous neuronal types. Here, we focus this search on the sensory and motor neurons of bilaterians, exploiting their well-defined molecular signatures in vertebrates. Sensorimotor circuits in vertebrates are of two types: somatic (that sense the environment and respond by shaping bodily motions) and visceral (that sense the interior milieu and respond by regulating vital functions). These circuits differ by a small set of largely dedicated transcriptional determinants: Brn3 is expressed in many somatic sensory neurons, first and second order (among which mechanoreceptors are uniquely marked by the Brn3+/Islet1+/Drgx+ signature), somatic motoneurons uniquely co-express Lhx3/4 and Mnx1, while the vast majority of neurons, sensory and motor, involved in respiration, blood circulation or digestion are molecularly defined by their expression and dependence on the pan-visceral determinant Phox2b. |
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