Clinical Significance of De Novo and Inherited Copy-Number Variation

Anneke T. Vulto-van Silfhout, Jayne Y. Hehir-Kwa, Bregje W.M. van Bon, Janneke H.M. Schuurs-Hoeijmakers, Stephen Meader, Claudia J.M. Hellebrekers, Ilse J.M. Thoonen, Arjan P.M. de Brouwer, Han G. Brunner, Caleb Webber, Rolph Pfundt, Nicole de Leeuw, Bert B.A. De Vries

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94 Citaten (Scopus)


Copy-number variations (CNVs) are a common cause of intellectual disability and/or multiple congenital anomalies (ID/MCA). However, the clinical interpretation of CNVs remains challenging, especially for inherited CNVs. Well-phenotyped patients (5,531) with ID/MCA were screened for rare CNVs using a 250K single-nucleotide polymorphism array platform in order to improve the understanding of the contribution of CNVs to a patients phenotype. We detected 1,663 rare CNVs in 1,388 patients (25.1%; range 0-5 per patient) of which 437 occurred de novo and 638 were inherited. The detected CNVs were analyzed for various characteristics, gene content, and genotype-phenotype correlations. Patients with severe phenotypes, including organ malformations, had more de novo CNVs (P < 0.001), whereas patient groups with milder phenotypes, such as facial dysmorphisms, were enriched for both de novo and inherited CNVs (P < 0.001), indicating that not only de novo but also inherited CNVs can be associated with a clinically relevant phenotype. Moreover, patients with multiple CNVs presented with a more severe phenotype than patients with a single CNV (P < 0.001), pointing to a combinatorial effect of the additional CNVs. In addition, we identified 20 de novo single-gene CNVs that directly indicate novel genes for ID/MCA, including ZFHX4, ANKH, DLG2, MPP7, CEP89, TRIO, ASTN2, and PIK3C3.

Originele taal-2Engels
Pagina's (van-tot)1679-1687
Aantal pagina's9
TijdschriftHuman Mutation
Nummer van het tijdschrift12
StatusGepubliceerd - dec. 2013
Extern gepubliceerdJa


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