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Updated: May 30, 2026

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
Phenotypic heterogeneity in two siblings with 3-methylglutaconic aciduria type I caused by a novel intragenic
Saadet Mercimek-Mahmutoglu1, Tracy Tucker, Brett Casey
1Division of Biochemical Diseases, Department of Pediatrics, University of British Columbia, Vancouver, Canada. smahmutoglu@cw.bc.ca
Abstract:
We describe two siblings with 3-methylglutaconic aciduria type I with phenotypic heterogeneity. The index case was a 14-year-old female with learning disability, attention deficit-hyperactivity and early onset subclinical leukoencephalopathy. Her 9-year-old brother had severe expressive speech delay and delay in speech sound development with normal cognitive functions. The diagnosis was confirmed by a demonstration of 3-methylglutaconyl-CoA hydratase enzyme deficiency in the cultured skin fibroblasts and homozygous deletion of exons 1-3 within the AUH gene.
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