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Hum Genet. 2018 May;137(5):401-411. doi: 10.1007/s00439-018-1892-1. Epub 2018 May 23.

De novo FBXO11 mutations are associated with intellectual disability and behavioural anomalies.

Author information

1
Institute of Human Genetics, University of Bonn, School of Medicine & University Hospital Bonn, Sigmund-Freud-Str. 25, 53127, Bonn, Germany.
2
Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstraße 55, 45147, Essen, Germany.
3
Institute of Medical Genetics and Applied Genomics, University of Tübingen, Calwerstrasse 7, 72076, Tübingen, Germany.
4
Institute of Human Genetics, Helmholtz Zentrum München, Ingolstaedter Landstr. 1, 85764, Neuherberg, Germany.
5
Institute of Human Genetics, Technische Universität München, Trogerstraße 32, 81675, München, Germany.
6
Heinrich-Heine-University, Medical Faculty, Institute of Human Genetics, Universitätsstr. 1, 40225, Düsseldorf, Germany.
7
Institute of Human Genetics, University of Bonn, School of Medicine & University Hospital Bonn, Sigmund-Freud-Str. 25, 53127, Bonn, Germany. hartmut.engels@uni-bonn.de.

Abstract

Intellectual disability (ID) has an estimated prevalence of 1.5-2%. In most affected individuals, its genetic basis remains unclear. Whole exome sequencing (WES) studies have identified a multitude of novel causative gene defects and have shown that a large proportion of sporadic ID cases results from de novo mutations. Here, we present two unrelated individuals with similar clinical features and deleterious de novo variants in FBXO11 detected by WES. Individual 1, a 14-year-old boy, has mild ID as well as mild microcephaly, corrected cleft lip and alveolus, hyperkinetic disorder, mild brain atrophy and minor facial dysmorphism. WES detected a heterozygous de novo 1 bp insertion in the splice donor site of exon 3. Individual 2, a 3-year-old boy, showed ID and pre- and postnatal growth retardation, postnatal mild microcephaly, hyperkinetic and restless behaviour, as well as mild dysmorphism. WES detected a heterozygous de novo frameshift mutation. While ten individuals with ID and de novo variants in FBXO11 have been reported as part of larger studies, only one of the reports has some additional clinical data. Interestingly, the latter individual carries the identical mutation as our individual 2 and also displays ID, intrauterine growth retardation, microcephaly, behavioural anomalies, and dysmorphisms. Thus, we confirm deleterious de novo mutations in FBXO11 as a cause of ID and start the delineation of the associated clinical picture which may also comprise postnatal microcephaly or borderline small head size and behavioural anomalies.

PMID:
29796876
DOI:
10.1007/s00439-018-1892-1
[Indexed for MEDLINE]

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