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beta-Catenin regulates intercellular signalling networks and cell-type specific transcription in the developing mouse midbrain-rhombomere 1 region.
- Source :
- PLoS ONE, Vol 5, Iss 6, p e10881 (2010)
- Publication Year :
- 2010
- Publisher :
- Public Library of Science (PLoS), 2010.
-
Abstract
- beta-Catenin is a multifunctional protein involved in both signalling by secreted factors of Wnt family and regulation of the cellular architecture. We show that beta-catenin stabilization in mouse midbrain-rhombomere 1 region leads to robust up-regulation of several Wnt signalling target genes, including Fgf8. Suggestive of direct transcriptional regulation of the Fgf8 gene, beta-catenin stabilization resulted in Fgf8 up-regulation also in other tissues, specifically in the ventral limb ectoderm. Interestingly, stabilization of beta-catenin rapidly caused down-regulation of the expression of Wnt1 itself, suggesting a negative feedback loop. The changes in signal molecule expression were concomitant with deregulation of anterior-posterior and dorso-ventral patterning. The transcriptional regulatory functions of beta-catenin were confirmed by beta-catenin loss-of-function experiments. Temporally controlled inactivation of beta-catenin revealed a cell-autonomous role for beta-catenin in the maintenance of cell-type specific gene expression in the progenitors of midbrain dopaminergic neurons. These results highlight the role of beta-catenin in establishment of neuroectodermal signalling centers, promoting region-specific gene expression and regulation of cell fate determination.
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 5
- Issue :
- 6
- Database :
- Directory of Open Access Journals
- Journal :
- PLoS ONE
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.85d14739e884580bb6c69ef5e37eaf0
- Document Type :
- article
- Full Text :
- https://doi.org/10.1371/journal.pone.0010881