Identification of pathogenic gene variants in small families with intellectually disabled siblings by exome sequencing.
Article Details
- CitationCopy to clipboard
Schuurs-Hoeijmakers JH, Vulto-van Silfhout AT, Vissers LE, van de Vondervoort II, van Bon BW, de Ligt J, Gilissen C, Hehir-Kwa JY, Neveling K, del Rosario M, Hira G, Reitano S, Vitello A, Failla P, Greco D, Fichera M, Galesi O, Kleefstra T, Greally MT, Ockeloen CW, Willemsen MH, Bongers EM, Janssen IM, Pfundt R, Veltman JA, Romano C, Willemsen MA, van Bokhoven H, Brunner HG, de Vries BB, de Brouwer AP
Identification of pathogenic gene variants in small families with intellectually disabled siblings by exome sequencing.
J Med Genet. 2013 Dec;50(12):802-11. doi: 10.1136/jmedgenet-2013-101644. Epub 2013 Oct 11.
- PubMed ID
- 24123876 [ View in PubMed]
- Abstract
BACKGROUND: Intellectual disability (ID) is a common neurodevelopmental disorder affecting 1-3% of the general population. Mutations in more than 10% of all human genes are considered to be involved in this disorder, although the majority of these genes are still unknown. OBJECTIVES: We investigated 19 small non-consanguineous families with two to five affected siblings in order to identify pathogenic gene variants in known, novel and potential ID candidate genes. Non-consanguineous families have been largely ignored in gene identification studies as small family size precludes prior mapping of the genetic defect. METHODS AND RESULTS: Using exome sequencing, we identified pathogenic mutations in three genes, DDHD2, SLC6A8, and SLC9A6, of which the latter two have previously been implicated in X-linked ID phenotypes. In addition, we identified potentially pathogenic mutations in BCORL1 on the X-chromosome and in MCM3AP, PTPRT, SYNE1, and ZNF528 on autosomes. CONCLUSIONS: We show that potentially pathogenic gene variants can be identified in small, non-consanguineous families with as few as two affected siblings, thus emphasising their value in the identification of syndromic and non-syndromic ID genes.