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Updated: Jul 18, 2026

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Tandem duplication of DMD exon 18 associated with epilepsy, macroglossia, and endocrinologic abnormalities
Claudia Weiss1, Sibylle Jakubiczka, Angela Huebner
1Department of Neuropediatrics, Charité University Medical Center, Augustenburger Platz 1, D-13353 Berlin, Germany. claudia.weiss@charite.de
Abstract:
We describe a patient with Duchenne muscular dystrophy (DMD) who additionally suffered from intractable seizures, severe mental retardation, and a marked macroglossia. He also had endocrinologic abnormalities consisting of growth hormone deficiency, delayed puberty, and adrenal hypoplasia. We detected a duplication of DMD exon 18 and flanking introns that caused a frame-shift and was not removed by corrective splicing. A coincident mutation in the FKRP gene was excluded by direct sequencing. Complex DNA rearrangements, deletions, and duplications >100 kb were excluded through microarray-comparative genomic hybridization (CGH), although we were not able to exclude a second coincident mutation with certainty. In conclusion, we present a case of DMD that conflicts with current understanding of genotype-phenotype relations and discuss putative pathogenetic mechanisms for this uncommon phenotype.
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