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Bmp and Wnt/beta-catenin signals control expression of the transcription factor Olig3 and the specification of spinal cord neurons

Item Type:Article
Title:Bmp and Wnt/beta-catenin signals control expression of the transcription factor Olig3 and the specification of spinal cord neurons
Creators Name:Zechner, D. and Muller, T. and Wende, H. and Walther, I. and Taketo, M.M. and Crenshaw, E.B. and Treier, M. and Birchmeier, W. and Birchmeier, C.
Abstract:In the developing spinal cord, signals of the roof plate pattern the dorsal progenitor domain and control the specification of three neuron types, dorsal interneurons dI1, dI2, and dI3. Bmp and Wnt/beta-catenin signals as well as transcription factors like Olig3 or Ngn1/2 are essential in this process. We have studied the epistatic relationship between Bmp and Wnt/beta-catenin signals and the transcription factor Olig3 in dorsal spinal cord patterning. Using beta-catenin gain-of-function and compound beta-catenin gain-of-function/Olig3 loss-of-function mutations in mice, we could show that Wnt/beta-catenin signals act upstream of Olig3 in the specification of dI2 and dI3 neurons. The analysis of such compound mutant mice allowed us to distinguish between the two functions of Wnt/beta-catenin signaling in proliferation and patterning of dorsal progenitors. Using electroporation of chick spinal cords, we further demonstrate that Bmp signals act upstream of Wnt/beta-catenin in the regulation of Olig3 and that Wnt/beta-catenin signals play an instructive role in controlling Olig3 expression. We conclude that Wnt/beta-catenin and BMP signals coordinately control the specification of dorsal neurons in the spinal cord.
Keywords:Wnt signaling, beta-catenin, Bmp signaling, Olig3, Ngn2, Basic helix-loop-helix transcription factor, Neuronal specification, Patterning of the spinal cord, Dorsal interneurons, Animals, Mice
Source:Developmental Biology
ISSN:0012-1606
Publisher:Academic Press (U.S.A.)
Volume:303
Number:1
Page Range:181-190
Date:1 March 2007
Official Publication:https://doi.org/10.1016/j.ydbio.2006.10.045
PubMed:View item in PubMed

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