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In-frame deletion and missense mutations of the C-terminal helicase domain of SMARCA2 in three patients with Nicolaides-Baraitser syndrome


Wolff, D; Endele, S; Azzarello-Burri, S; Hoyer, J; Zweier, M; Schanze, I; Schmitt, B; Rauch, A; Reis, A; Zweier, C (2012). In-frame deletion and missense mutations of the C-terminal helicase domain of SMARCA2 in three patients with Nicolaides-Baraitser syndrome. Molecular Syndromology, 2(6):237-244.

Abstract

Using high-resolution molecular karyotyping with SNP arrays to identify candidate genes for etiologically unexplained intellectual disability, we identified a 32-kb de novo in-frame deletion of the C-terminal helicase domain of the SMARCA2 gene in a patient with severe intellectual disability, epilepsy, sparse hair, prominent joints, and distinct facial anomalies. Sequencing of the gene in patients with a similar phenotype revealed de novo missense mutations in this domain in 2 further patients, pointing to a crucial role of the SMARCA2 C-terminal helicase domain. The clinical features observed in all 3 patients are typical of Nicolaides-Baraitser syndrome, an only rarely reported syndrome with mainly moderate to severe intellectual disability. Notably, one of our patients with a p.Gly1132Asp mutation showed typical morphological features but an exceptional good development with borderline overall IQ and learning difficulties, thus expanding the phenotypic spectrum of Nicolaides-Baraitser syndrome.

Using high-resolution molecular karyotyping with SNP arrays to identify candidate genes for etiologically unexplained intellectual disability, we identified a 32-kb de novo in-frame deletion of the C-terminal helicase domain of the SMARCA2 gene in a patient with severe intellectual disability, epilepsy, sparse hair, prominent joints, and distinct facial anomalies. Sequencing of the gene in patients with a similar phenotype revealed de novo missense mutations in this domain in 2 further patients, pointing to a crucial role of the SMARCA2 C-terminal helicase domain. The clinical features observed in all 3 patients are typical of Nicolaides-Baraitser syndrome, an only rarely reported syndrome with mainly moderate to severe intellectual disability. Notably, one of our patients with a p.Gly1132Asp mutation showed typical morphological features but an exceptional good development with borderline overall IQ and learning difficulties, thus expanding the phenotypic spectrum of Nicolaides-Baraitser syndrome.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Children's Hospital Zurich > Medical Clinic
04 Faculty of Medicine > Institute of Medical Genetics
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2012
Deposited On:29 Jan 2013 12:32
Last Modified:22 Jun 2016 15:10
Publisher:Karger
ISSN:1661-8769
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1159/000337323
PubMed ID:22822383
Permanent URL: https://doi.org/10.5167/uzh-72428

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