Background: Neurodegeneration with brain iron accumulation is clinically and genetically heterogeneous because of mutations in at least 7 nuclear genes.
Methods: We performed homozygosity mapping and whole-exome sequencing in 2 brothers with brain iron accumulation from a consanguineous family.
Results: We identified a homozygous missense mutation in both brothers in the very recently identified chromosome 19 open-reading frame 12 gene. The disease presented before age 10 with slowly progressive tremor, dystonia, and spasticity. Additional features were optic atrophy, peripheral neuropathy, and learning difficulties. A raised serum creatine kinase indicated neuromuscular involvement, and compensatory mitochondrial proliferation implicated mitochondrial dysfunction as a pathological mechanism.
Conclusions: Further studies are needed to explore the function of the chromosome 19 open-reading frame 12 gene, and extended genetic analysis on larger patient cohorts will provide more information about the presentation and frequency of this disease.
Copyright © 2012 Movement Disorder Society.