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.
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Acknowledgements
We thank the patients and their families for their participation in this study. This work was supported in part by the German Ministry of Research and Education/Bundesministerium für Bildung und Forschung BMBF (Grant Numbers 01GS08164, 01GS08167, 01GS08163 to HE, DW and TMS, German Mental Retardation Network) as part of the National Genome Research Network and through the Juniorverbund in der Systemmedizin “mitOmics” (01ZX1405C to TBH). This study makes use of data generated by the DECIPHER community. A full list of centres who contributed to the generation of the data is available from http://decipher.sanger.ac.uk and via email from decipher@sanger.ac.uk. Funding for the project was provided by the Wellcome Trust.
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Fritzen, D., Kuechler, A., Grimmel, M. et al. De novo FBXO11 mutations are associated with intellectual disability and behavioural anomalies. Hum Genet 137, 401–411 (2018). https://doi.org/10.1007/s00439-018-1892-1
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DOI: https://doi.org/10.1007/s00439-018-1892-1