New mitochondrial tRNA HIS mutation in a family with lactic acidosis and stroke-like episodes (MELAS) |
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| Authors: | Calvaruso Maria Antonietta Willemsen Michel A Rodenburg Richard J van den Brand Mariël Smeitink Jan A M Nijtmans Leo |
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| Affiliation: | aNijmegen Center for Mitochondrial Disorders at the Department of Pediatrics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands;bDepartment of Pediatric Neurology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands |
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| Abstract: | We report a new mutation in m.12146 A > G in the mt-tRNAHis in a family with a remarkable clinical history having different degrees of lactic acidosis and stroke-like episodes. Biochemical measurements of a muscle biopsy established an isolated complex IV deficiency, while similar analysis of fibroblasts showed a combined complex I,III and IV deficiency. Transmitochondrial cybrid analysis proved that this tRNAHis mutation causes the enzymatic deficiency. This family illustrates the complexity of the clinical, biochemical and genetic characteristics of a novel mtDNA encoded disorder, as well as the challenge to prove its pathogenicity. |
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| Keywords: | Mitochondria mt-tRNAHis MELAS mt-translation Cybrids |
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