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 hytertrophic cardiomyopathy in childhood.
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Hamilton Hlth Sci, Dept Med, Hamilton, ON, CanadaHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Connolly, Barbara S.
Feigenbaum, Annette S. J.
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Hosp Sick Children, Div Clin & Metab Genet, Toronto, ON M5G 1X8, Canada
Univ Toronto, Toronto, ON, CanadaHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Feigenbaum, Annette S. J.
Robinson, Brian H.
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Univ Toronto, Toronto, ON, Canada
Hosp Sick Children, Program Genet & Genome Biol, SickKids Res Inst, Toronto, ON M5G 1X8, Canada
Hosp Sick Children, Dept Pediat, Toronto, ON M5G 1X8, Canada
Hosp Sick Children, Dept Biochem, Toronto, ON M5G 1X8, CanadaHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Robinson, Brian H.
Dipchand, Anne I.
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Univ Toronto, Toronto, ON, Canada
Hosp Sick Children, Div Cardiol, Toronto, ON M5G 1X8, CanadaHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Dipchand, Anne I.
Simon, David K.
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Beth Israel Deaconess Med Ctr, Dept Neurol, Boston, MA 02215 USA
Harvard Univ, Sch Med, Boston, MA USAHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Simon, David K.
Tarnopolsky, Mark A.
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Hamilton Hlth Sci, Dept Med, Hamilton, ON, Canada
Hamilton Hlth Sci, Dept Pediat Neuromuscular & Neurometab Disorders, Hamilton, ON, CanadaHamilton Hlth Sci, Dept Med, Hamilton, ON, Canada