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A 3-base pair deletion, c.9711_9713del, in DMD results in intellectual disability without muscular dystrophy.

ABSTRACT: We have identified a deletion of 3 base pairs in the dystrophin gene (DMD), c.9711_9713del, in a family with nonspecific X-linked intellectual disability (ID) by sequencing of the exons of 86 known X-linked ID genes. This in-frame deletion results in the deletion of a single-amino-acid residue, Leu3238, in the brain-specific isoform Dp71 of dystrophin. Linkage analysis supported causality as the mutation was present in the 7.6?cM linkage interval on Xp22.11-Xp21.1 with a maximum positive LOD score of 2.41 (MRX85 locus). Molecular modeling predicts that the p.(Leu3238del) deletion results in the destabilization of the C-terminal domain of dystrophin and hence reduces the ability to interact with ?-dystroglycan. Correspondingly, Dp71 protein levels in lymphoblastoid cells from the index patient are 6.7-fold lower than those in control cell lines (P=0.08). Subsequent determination of the creatine kinase levels in blood of the index patient showed a mild but significant elevation in serum creatine kinase, which is in line with impaired dystrophin function. In conclusion, we have identified the first DMD mutation in Dp71 that results in ID without muscular dystrophy.

SUBMITTER: de Brouwer AP

PROVIDER: S-EPMC3953899 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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A 3-base pair deletion, c.9711_9713del, in DMD results in intellectual disability without muscular dystrophy.

de Brouwer Arjan P M AP Nabuurs Sander B SB Verhaart Ingrid E C IE Oudakker Astrid R AR Hordijk Roel R Yntema Helger G HG Hordijk-Hos Jannet M JM Voesenek Krysta K de Vries Bert B A BB van Essen Ton T Chen Wei W Hu Hao H Chelly Jamel J den Dunnen Johan T JT Kalscheuer Vera M VM Aartsma-Rus Annemieke M AM Hamel Ben C J BC van Bokhoven Hans H Kleefstra Tjitske T

European journal of human genetics : EJHG 20130731 4

We have identified a deletion of 3 base pairs in the dystrophin gene (DMD), c.9711_9713del, in a family with nonspecific X-linked intellectual disability (ID) by sequencing of the exons of 86 known X-linked ID genes. This in-frame deletion results in the deletion of a single-amino-acid residue, Leu3238, in the brain-specific isoform Dp71 of dystrophin. Linkage analysis supported causality as the mutation was present in the 7.6 cM linkage interval on Xp22.11-Xp21.1 with a maximum positive LOD sco ...[more]

PMID: 23900271

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Project description:Introductions Duchenne muscular dystrophy (DMD) is an X-linked recessive progressive muscular disease marked by developmental delays due to mutations in the DMD gene, which encodes dystrophin. Brain comorbidity adds to the burden of limited mobility and significantly impacts patients’ quality of life and their family. The changes of expression of dystrophin isoforms in the brain due to DMD gene mutations are thought to be related to the cognitive and neurobehavior profiles of DMD. Objectives This cross-sectional study aimed to characterize cognitive and neurodevelopmental profiles of patients with DMD and to explore underlying genotype-phenotype associations. Methods Patients with DMD aged 5–18 years from Dr Sardjito Hospital and Universitas Gadjah Mada Academic Hospital from 2017–2022 were included. Multiplex ligation-dependent probe amplification and whole exome sequencing were used to determine mutations in the DMD genes. Cognitive function was measured by intelligence quotient testing using the Wechsler Intelligence Scale for Children and adaptive function tests with Vineland Adaptive Behavior Scales. The Autism Mental Status Exam and Abbreviated Conner’s Rating Scale were used to screen for autism spectrum disorder (ASD) and attention deficit and hyperactivity disorder (ADHD), respectively. Results The mean total IQ score of DMD patients was lower than that of the general population (80.6 ± 22.0 vs 100 ± 15), with intellectual disability observed in 15 boys (29.4%). Of the 51 patients with DMD, the Dp71 group had the lowest cognitive performance with a total IQ score (46 ± 24.8; p = 0.003), while the Dp427 group and Dp140 group’s total IQ scores were 83.0 ± 24.6 and 84.2 ± 17.5 respectively. There were no DMD patients with ASD, while 4 boys (7.8%) had comorbidity with ADHD. Conclusion Boys with DMD are at higher risk of intellectual disability. The risk appears to increase with mutations at the 3’ end of the gene (Dp71 disruption). Moreover, Dp71 disruption might not be associated with ADHD and ASD in patients with DMD.

Dataset Information

A 3-base pair deletion, c.9711_9713del, in DMD results in intellectual disability without muscular dystrophy.

Publications

A 3-base pair deletion, c.9711_9713del, in DMD results in intellectual disability without muscular dystrophy.

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