Downregulated Wnt/β-catenin signalling in the Down syndrome hippocampusMore about Open Access at the Crick
Authors listSimone Granno Jonathon Nixon-Abell Daniel C Berwick Justin Tosh George Heaton Sultan Almudimeegh Zenisha Nagda Jean-Christophe Rain Manuela Zanda Vincent Plagnol Victor Tybulewicz Karen Cleverley Frances K Wiseman Elizabeth MC Fisher Kirsten Harvey
Pathological mechanisms underlying Down syndrome (DS)/Trisomy 21, including dysregulation of essential signalling processes remain poorly understood. Combining bioinformatics with RNA and protein analysis, we identified downregulation of the Wnt/β-catenin pathway in the hippocampus of adult DS individuals with Alzheimer's disease and the 'Tc1' DS mouse model. Providing a potential underlying molecular pathway, we demonstrate that the chromosome 21 kinase DYRK1A regulates Wnt signalling via a novel bimodal mechanism. Under basal conditions, DYRK1A is a negative regulator of Wnt/β-catenin. Following pathway activation, however, DYRK1A exerts the opposite effect, increasing signalling activity. In summary, we identified downregulation of hippocampal Wnt/β-catenin signalling in DS, possibly mediated by a dose dependent effect of the chromosome 21-encoded kinase DYRK1A. Overall, we propose that dosage imbalance of the Hsa21 gene DYRK1A affects downstream Wnt target genes. Therefore, modulation of Wnt signalling may open unexplored avenues for DS and Alzheimer's disease treatment.
Journal Scientific Reports
Issue number 1