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© 2019, European Society of Human Genetics. CYFIP2, encoding the evolutionary highly conserved cytoplasmic FMRP interacting protein 2, has previously been proposed as a candidate gene for intellectual disability and autism because of its important role linking FMRP-dependent transcription regulation and actin polymerization via the WAVE regulatory complex (WRC). Recently, de novo variants affecting the amino acid p.Arg87 of CYFIP2 were reported in four individuals with epileptic encephalopathy. We here report 12 independent patients harboring a variety of de novo variants in CYFIP2 broadening the molecular and clinical spectrum of a novel CYFIP2-related neurodevelopmental disorder. Using trio whole-exome or -genome sequencing, we identified 12 independent patients carrying a total of eight distinct de novo variants in CYFIP2 with a shared phenotype of intellectual disability, seizures, and muscular hypotonia. We detected seven different missense variants, of which two occurred recurrently (p.(Arg87Cys) and p.(Ile664Met)), and a splice donor variant in the last intron for which we showed exon skipping in the transcript. The latter is expected to escape nonsense-mediated mRNA decay resulting in a truncated protein. Despite the large spacing in the primary structure, the variants spatially cluster in the tertiary structure and are all predicted to weaken the interaction with WAVE1 or NCKAP1 of the actin polymerization regulating WRC-complex. Preliminary genotype–phenotype correlation indicates a profound phenotype in p.Arg87 substitutions and a more variable phenotype in other alterations. This study evidenced a variety of de novo variants in CYFIP2 as a novel cause of mostly severe intellectual disability with seizures and muscular hypotonia.
Author(s): Zweier M, Begemann A, McWalter K, Cho MT, Abela L, Banka S, Behring B, Berger A, Brown CW, Carneiro M, Chen J, Cooper GM, Finnila CR, Guillen Sacoto MJ, Henderson A, Huffmeier U, Joset P, Kerr B, Lesca G, Leszinski GS, McDermott JH, Meltzer MR, Monaghan KG, Mostafavi R, Ounap K, Plecko B, Powis Z, Purcarin G, Reimand T, Riedhammer KM, Schreiber JM, Sirsi D, Wierenga KJ, Wojcik MH, Papuc SM, Steindl K, Sticht H, Rauch A
Publication type: Article
Publication status: Published
Journal: European Journal of Human Genetics
Print publication date: 01/05/2019
Online publication date: 21/01/2019
Acceptance date: 07/11/2018
ISSN (print): 1018-4813
ISSN (electronic): 1476-5438
Publisher: Nature Publishing Group
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