| Autor: |
Begemann, Anaïs, Sticht, Heinrich, Begtrup, Amber, Vitobello, Antonio, Faivre, Laurence, Banka, Siddharth, Alhaddad, Bader, Asadollahi, Reza, Becker, Jessica, Bierhals, Tatjana, Brown, Kathleen E., Bruel, Ange L., Brunet, Theresa, Carneiro, Maryline, Cremer, Kirsten, Day, Robert, Denommé-Pichon, Anne S., Dyment, Dave A. |
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| Zdroj: |
ETSU Faculty Works. |
| Druh dokumentu: |
Text |
| Popis: |
Purpose: A few de novo missense variants in the cytoplasmic FMRP-interacting protein 2 (CYFIP2) gene have recently been described as a novel cause of severe intellectual disability, seizures, and hypotonia in 18 individuals, with p.Arg87 substitutions in the majority. Methods: We assembled data from 19 newly identified and all 18 previously published individuals with CYFIP2 variants. By structural modeling and investigation of WAVE-regulatory complex (WRC)-mediated actin polymerization in six patient fibroblast lines we assessed the impact of CYFIP2 variants on the WRC. Results: Sixteen of 19 individuals harbor two previously described and 11 novel (likely) disease-associated missense variants. We report p.Asp724 as second mutational hotspot (4/19 cases). Genotype–phenotype correlation confirms a consistently severe phenotype in p.Arg87 patients but a more variable phenotype in p.Asp724 and other substitutions. Three individuals with milder phenotypes carry putative loss-of-function variants, which remain of unclear pathogenicity. Structural modeling predicted missense variants to disturb interactions within the WRC or impair CYFIP2 stability. Consistent with its role in WRC-mediated actin polymerization we substantiate aberrant regulation of the actin cytoskeleton in patient fibroblasts. Conclusion: Our study expands the clinical and molecular spectrum of CYFIP2-related neurodevelopmental disorder and provides evidence for aberrant WRC-mediated actin dynamics as contributing cellular pathomechanism. |
| Databáze: |
Networked Digital Library of Theses & Dissertations |
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