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Reports an A5814G mitochondrial DNA mutation causing severe cardiomyopathy and myopathy in a child, highlighting its clinical heterogeneity.
We describe a 5-year-old child with hypertrophic cardiomyopathy, mitochondrial myopathy, and lactic acidosis. Mitochondrial DNA analysis showed a heteroplasmic A5814G point mutation in the tRNA(Cys) gene. The mutational load was extremely high (>95%) in muscle, fibroblasts, and blood. This report expands the clinical heterogeneity of the A5814G mutation, which should be considered in the differential diagnosis of hypertrophic cardiomyopathy in childhood.
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Karadimas et al. (2001) studied this question.
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