Childhood onset tubular aggregate myopathy associated with de novo STIM1 mutations
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We investigated three unrelated patients with tubular-aggregate myopathy and slowly progressive muscle weakness manifesting in the first years of life. All patients showed type 1 muscle fiber predominance and hypotrophy of type 2 fibers. Tubular aggregates were abundant. In all three patients mutations were identified in the gene STIM1, and the mutations were found to be de novo in all patients. In one of the patients the mutation was identified by exome sequencing. Two patients harbored the previously described mutation c.326A>G p.(His109Arg), while the third patient had a novel mutation c.343A>T p.(Ile115Phe). Taking our series together with previously published cases, the c.326A>G p.(His109Arg) seems to be a hotspot mutation that is characteristically related to early onset muscle weakness.
KeywordsMyopathy Tubular aggregates STIM1 De novo mutation
Funding was provided from the Italian Ministry of Health Ricerca Finalizzata (to EB, AD, SP, GT and FF), the Italian Ministry of Health Ricerca Corrente (to MN, AC and MT), and the Swedish Research Council (to AO; Proj. No 7122).
Conflicts of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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