Space-time
in Neural Development
Studying a population of neural progenitor cells in the mouse
rhombencephalon, Pattyn et al. (Coordinated temporal and spatial
control of motoneuron and serotonergic neuron generation from a common pool of
CNS progenitors, Genes and Development, 17, 729-737, 2003) found that some
homeobox genes act to couple spatial and temporal aspects of neural
differentiation. In the rhombencephalon or ventral hindbrain, a population of
progenitor neurons gives rise to visceral motoneurons. At a defined time,
occurring about embryonic day 10 in the mouse, progenitors switch from visceral
to 5-HT neuron production except for the cells in a segment of the area called
“r4”.
A set of homeobox genes also important for the spatial patterning, is
involved in this regulation. Further studies might show this mechanism in other
regions of the central nervous system.
BM&L-April
2003