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Type: Journal article
Title: Xp11.2 microduplications including IQSEC2, TSPYL2 and KDM5C genes in patients with neurodevelopmental disorders
Author: Moey, C.
Hinze, S.
Brueton, L.
Morton, J.
McMullan, D.
Kamien, B.
Barnett, C.
Brunetti-Pierri, N.
Nicholl, J.
Gecz, J.
Shoubridge, C.
Citation: European Journal of Human Genetics, 2016; 24(3):373-380
Publisher: Nature Publishing Group
Issue Date: 2016
ISSN: 1018-4813
Statement of
Ching Moey, Susan J Hinze, Louise Brueton, Jenny Morton, Dominic J McMullan, Benjamin Kamien, Christopher P Barnett, Nicola Brunetti-Pierri, Jillian Nicholl, Jozef Gecz and Cheryl Shoubridge
Abstract: Copy number variations are a common cause of intellectual disability (ID). Determining the contribution of copy number variants (CNVs), particularly gains, to disease remains challenging. Here, we report four males with ID with sub-microscopic duplications at Xp11.2 and review the few cases with overlapping duplications reported to date. We established the extent of the duplicated regions in each case encompassing a minimum of three known disease genes TSPYL2, KDM5C and IQSEC2 with one case also duplicating the known disease gene HUWE1. Patients with a duplication encompassing TSPYL2, KDM5C and IQSEC2 without gains of nearby SMC1A and HUWE1 genes have not been reported thus far. All cases presented with ID and significant deficits of speech development. Some patients also manifested behavioral disturbances such as hyperactivity and attention-deficit/hyperactivity disorder. Lymphoblastic cell lines from patients show markedly elevated levels of TSPYL2, KDM5C and SMC1A, transcripts consistent with the extent of their CNVs. The duplicated region in our patients contains several genes known to escape X-inactivation, including KDM5C, IQSEC2 and SMC1A. In silico analysis of expression data in selected gene expression omnibus series indicates that dosage of these genes, especially IQSEC2, is similar in males and females despite the fact they escape from X-inactivation in females. Taken together, the data suggest that gains in Xp11.22 including IQSEC2 cause ID and are associated with hyperactivity and attention-deficit/hyperactivity disorder, and are likely to be dosage-sensitive in males.
Keywords: Chromosomes, Human, X
Guanine Nucleotide Exchange Factors
Cell Cycle Proteins
DNA-Binding Proteins
Nuclear Proteins
Chromosomal Proteins, Non-Histone
RNA, Messenger
Gene Expression Regulation
Child, Preschool
Infant, Newborn
Young Adult
Histone Demethylases
Chromosome Duplication
Intellectual Disability
Neurodevelopmental Disorders
Rights: © 2016 Macmillan Publishers Limited All rights reserved 1018-4813/16
DOI: 10.1038/ejhg.2015.123
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