Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/98704
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dc.contributor.authorSnijders Blok, L.en
dc.contributor.authorMadsen, E.en
dc.contributor.authorJuusola, J.en
dc.contributor.authorGilissen, C.en
dc.contributor.authorBaralle, D.en
dc.contributor.authorReijnders, M.en
dc.contributor.authorVenselaar, H.en
dc.contributor.authorHelsmoortel, C.en
dc.contributor.authorCho, M.en
dc.contributor.authorHoischen, A.en
dc.contributor.authorVissers, L.en
dc.contributor.authorKoemans, T.en
dc.contributor.authorWissink-Lindhout, W.en
dc.contributor.authorEichler, E.en
dc.contributor.authorRomano, C.en
dc.contributor.authorVan Esch, H.en
dc.contributor.authorStumpel, C.en
dc.contributor.authorVreeburg, M.en
dc.contributor.authorSmeets, E.en
dc.contributor.authorOberndorff, K.en
dc.contributor.authoret al.en
dc.date.issued2015en
dc.identifier.citationAmerican Journal of Human Genetics, 2015; 97(2):343-352en
dc.identifier.issn0002-9297en
dc.identifier.issn1537-6605en
dc.identifier.urihttp://hdl.handle.net/2440/98704-
dc.description.abstractIntellectual disability (ID) affects approximately 1%-3% of humans with a gender bias toward males. Previous studies have identified mutations in more than 100 genes on the X chromosome in males with ID, but there is less evidence for de novo mutations on the X chromosome causing ID in females. In this study we present 35 unique deleterious de novo mutations in DDX3X identified by whole exome sequencing in 38 females with ID and various other features including hypotonia, movement disorders, behavior problems, corpus callosum hypoplasia, and epilepsy. Based on our findings, mutations in DDX3X are one of the more common causes of ID, accounting for 1%-3% of unexplained ID in females. Although no de novo DDX3X mutations were identified in males, we present three families with segregating missense mutations in DDX3X, suggestive of an X-linked recessive inheritance pattern. In these families, all males with the DDX3X variant had ID, whereas carrier females were unaffected. To explore the pathogenic mechanisms accounting for the differences in disease transmission and phenotype between affected females and affected males with DDX3X missense variants, we used canonical Wnt defects in zebrafish as a surrogate measure of DDX3X function in vivo. We demonstrate a consistent loss-of-function effect of all tested de novo mutations on the Wnt pathway, and we further show a differential effect by gender. The differential activity possibly reflects a dose-dependent effect of DDX3X expression in the context of functional mosaic females versus one-copy males, which reflects the complex biological nature of DDX3X mutations.en
dc.description.statementofresponsibilityLot Snijders Blok ... Marie Shaw, Jozef Gecz, Eric Haan ... et al.en
dc.language.isoenen
dc.publisherElsevieren
dc.rights©2015 by The American Society of Human Genetics. All rights reserved.en
dc.subjectHumansen
dc.titleMutations in DDX3X are a common cause of unexplained intellectual disability with gender-specific effects on Wnt signalingen
dc.typeJournal articleen
dc.identifier.rmid0030032422en
dc.identifier.doi10.1016/j.ajhg.2015.07.004en
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/628952en
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1041920en
dc.identifier.pubid195717-
pubs.library.collectionPaediatrics publicationsen
pubs.library.teamDS03en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidShaw, M. [0000-0002-5060-190X]en
dc.identifier.orcidGecz, J. [0000-0002-7884-6861]en
dc.identifier.orcidHaan, E. [0000-0002-7310-5124]en
Appears in Collections:Paediatrics publications

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