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Mutations in genes encoding the cadherin receptor-ligand pair DCHS1 and FAT4 disrupt cerebral cortical development

Abstract

The regulated proliferation and differentiation of neural stem cells before the generation and migration of neurons in the cerebral cortex are central aspects of mammalian development. Periventricular neuronal heterotopia, a specific form of mislocalization of cortical neurons, can arise from neuronal progenitors that fail to negotiate aspects of these developmental processes. Here we show that mutations in genes encoding the receptor-ligand cadherin pair DCHS1 and FAT4 lead to a recessive syndrome in humans that includes periventricular neuronal heterotopia. Reducing the expression of Dchs1 or Fat4 within mouse embryonic neuroepithelium increased progenitor cell numbers and reduced their differentiation into neurons, resulting in the heterotopic accumulation of cells below the neuronal layers in the neocortex, reminiscent of the human phenotype. These effects were countered by concurrent knockdown of Yap, a transcriptional effector of the Hippo signaling pathway. These findings implicate Dchs1 and Fat4 upstream of Yap as key regulators of mammalian neurogenesis.

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Figure 1: Homozygous or compound heterozygous mutations in FAT4 or DCHS1 result in VMS.
Figure 2: FAT4 is expressed in the embryonic human cerebral cortex, and germline Fat4−/− mice do not exhibit neuronal heterotopia.
Figure 3: Abnormal distribution of neuroprogenitor cells with mouse embryonic cortices electroporated with shFat4 or shDchs1.
Figure 4: Knockdown of Fat4 or Dchs1 leads to increased proliferation of neuroprogenitor cells and accumulation of neuronal precursors.
Figure 5: Knockdown of Yap, a transcriptional activator negatively regulated by Hippo signaling, rescues the proliferation and differentiation phenotype produced by shRNA-mediated knockdown of Fat4 or Dchs1.

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Acknowledgements

We thank the families participating in this study for their involvement. This work was supported by funding from Cure Kids New Zealand and the Health Research Council of New Zealand (10/402) (S.P.R.), the Department of Health through the National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre award to Guy's and St. Thomas' NHS Foundation Trust in partnership with King's College London and King's College Hospital NHS Foundation Trust (M.A.S.), Deutsche Forschungsgemeinschaft:SFB 817, Synergy and the Bundesministerium für Bildung und Forschung (M.G. and S.C.). The human embryonic and fetal material was provided by the joint Medical Research Council (grant G0700089)/Wellcome Trust (grant GR082557) Human Developmental Biology Resource. We thank F. Calzolari for the design of the Yap miRNA, P. Malatesta (Department of Experimental Medicine (DiMES), University of Genoa), K. Guan (Life Sciences Institute, University of Michigan) and S. Piccolo (Department of Molecular Medicine, University of Padua School of Medicine) for sharing plasmids and T. Öztürk and A. Waiser for excellent technical support.

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S.C., M.J.G., S.M., M.G. and S.P.R. conceived and designed the study. S.C., M.J.G., C.B., S.L., M.E., M. Srour, F.F.H., Z.A.J., T.M., N.P., V.M. and M.A.S. performed the experiments and analyzed the data in conjunction with A.J.S.-S., M.A.B., D.M., J.L.M., H.M., M.G. and S.P.R. D.C., T.U., J.T., P.S., N.D.D., L.V.M., T.N., R.N.-E., M. Swinkells, P.T., L.C.W., P.J.G.Z. and S.M. provided reagents, clinical information and analysis of human subjects. S.C., M.J.G., M.G. and S.P.R. wrote the manuscript, which all authors refined and approved.

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Correspondence to Magdalena Götz or Stephen P Robertson.

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Cappello, S., Gray, M., Badouel, C. et al. Mutations in genes encoding the cadherin receptor-ligand pair DCHS1 and FAT4 disrupt cerebral cortical development. Nat Genet 45, 1300–1308 (2013). https://doi.org/10.1038/ng.2765

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