First published online June 1, 2005
Development 132, 1201e (2005)
© The Company of Biologists Limited
Transcription factor codes for neural development
Temporal and spatial combinations or codes of transcription factors control
many aspects of development. Now, on p.
2709, Helms and
co-workers describe a code comprising bHLH transcription factors that controls
the generation of early-born dorsal neuronal populations in mice. The dorsal
spinal cord contains a diverse array of neurons that form the circuitry
linking the sensory input from the periphery to spinal cord motoneurons and
the brain. The researchers use fate mapping and genetic experiments to show
that, while the bHLH transcription factor Mash1 is necessary and sufficient
for the specification of dI3 and dI5 neurons, the number of these neurons that
form depends on the activity of the bHLH transcription factor Ngn2. Thus, the
researchers suggest, the balance of Mash1 and Ngn2 activity is pivotal in
establishing the correct composition of neurons in the dorsal spinal cord.

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Related articles in Development:
- Sequential roles for Mash1 and Ngn2 in the generation of dorsal spinal cord interneurons
- Amy W. Helms, James Battiste, R. Michael Henke, Yuji Nakada, Nicolas Simplicio, Francois Guillemot, and Jane E. Johnson
Development 2005 132: 2709-2719.
[Abstract]
[Full Text]