Redefining the Etiologic Landscape of Cerebellar Malformations
| Autor: | Kaylee Park, Georg Seelig, Robert J. Hopkin, Steven Lisgo, Joseph G. Gleeson, Yuri A. Zarate, Charles E. Schwartz, Stephen R. Braddock, Katherine Wusik, Zachary Thomson, Deborah A. Nickerson, Charles M. Roco, Susan Sell, Jordan Zeiger, Chi V. Cheng, Matthew Hirano, Julie R. Jones, Roger L. Ladda, Gisele E. Ishak, Amy Goldstein, David B. Everman, Dan Doherty, Sarah Collins, William B. Dobyns, Lynne M. Overmann, Ian A. Glass, Alexander B. Rosenberg, Megan T. Cho, Kathleen A. Leppig, Kimberly A. Aldinger, Brian H.Y. Chung, Andrew E. Timms, Kathleen J. Millen, Fatima Abidi, Michael J. Bamshad, Cynthia J. Curry, Fowzan S. Alkuraya, A. James Barkovich, James T. Bennett, Parthiv Haldipur, Leslie G. Biesecker, Ian D. Krantz, Ghayda M. Mirzaa, Dianne Gerrelli, Barbara McGillivray, Sara S. Cathey |
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| Rok vydání: | 2019 |
| Předmět: |
Male
0301 basic medicine Cerebellum PDGFRB Bioinformatics Article Cohort Studies 03 medical and health sciences Epilepsy 0302 clinical medicine Pregnancy Intellectual disability Genetics Humans Medicine Exome Genetics (clinical) Exome sequencing business.industry medicine.disease 030104 developmental biology medicine.anatomical_structure Etiology Autism Female business 030217 neurology & neurosurgery |
| Zdroj: | The American Journal of Human Genetics. 105:606-615 |
| ISSN: | 0002-9297 |
| Popis: | Cerebellar malformations are diverse congenital anomalies frequently associated with developmental disability. Although genetic and prenatal non-genetic causes have been described, no systematic analysis has been performed. Here, we present a large-exome sequencing study of Dandy-Walker malformation (DWM) and cerebellar hypoplasia (CBLH). We performed exome sequencing in 282 individuals from 100 families with DWM or CBLH, and we established a molecular diagnosis in 36 of 100 families, with a significantly higher yield for CBLH (51%) than for DWM (16%). The 41 variants impact 27 neurodevelopmental-disorder-associated genes, thus demonstrating that CBLH and DWM are often features of monogenic neurodevelopmental disorders. Though only seven monogenic causes (19%) were identified in more than one individual, neuroimaging review of 131 additional individuals confirmed cerebellar abnormalities in 23 of 27 genetic disorders (85%). Prenatal risk factors were frequently found among individuals without a genetic diagnosis (30 of 64 individuals [47%]). Single-cell RNA sequencing of prenatal human cerebellar tissue revealed gene enrichment in neuronal and vascular cell types; this suggests that defective vasculogenesis may disrupt cerebellar development. Further, de novo gain-of-function variants in PDGFRB, a tyrosine kinase receptor essential for vascular progenitor signaling, were associated with CBLH, and this discovery links genetic and non-genetic etiologies. Our results suggest that genetic defects impact specific cerebellar cell types and implicate abnormal vascular development as a mechanism for cerebellar malformations. We also confirmed a major contribution for non-genetic prenatal factors in individuals with cerebellar abnormalities, substantially influencing diagnostic evaluation and counseling regarding recurrence risk and prognosis. |
| Databáze: | OpenAIRE |
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