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Development ePress online publication date 21 Jun 2006
doi: 10.1242/dev.02441

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Research article

The roof plate regulates cerebellar cell-type specification and proliferation


Victor V. Chizhikov, Anne G. Lindgren, D. Spencer Currle, Matthew F. Rose, Edwin S. Monuki, and Kathleen J. Millen*
* Author for correspondence (e-mail: kmillen{at}genetics.bsd.uchicago.edu)

During embryogenesis, the isthmic organizer, a well-described signaling center at the junction of the mid-hindbrain, establishes the cerebellar territory along the anterior/posterior axis of the neural tube. Mechanisms specifying distinct populations within the early cerebellar anlage are less defined. Using a newly developed gene expression map of the early cerebellar anlage, we demonstrate that secreted signals from the rhombomere 1 roof plate are both necessary and sufficient for specification of the adjacent cerebellar rhombic lip and its derivative fates. Surprisingly, we show that the roof plate is not absolutely required for initial specification of more distal cerebellar cell fates, but rather regulates progenitor proliferation and cell position within the cerebellar anlage. Thus, in addition to the isthmus, the roof plate represents an important signaling center controlling multiple aspects of cerebellar patterning.
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