Early-onset cerebellar ataxia,myoclonus and hypogonadism in a case of mitochondrial complex III deficiency treated with vitamins K3 and C |
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Authors: | A Toscano M C Fazio G Vita S Cannavó N Bresolin L Bet A Prelle B Barbiroli S Iotti P Zaniol A Magaudda F Trimarchi C Messina |
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Institution: | (1) Istituto di Scienze Neurologiche e Neurochirurgiche, Universita' di Messina, Messina, Italy;(2) Cattedra di Endocrinologia, Universita' di Messina, Messina, Italy;(3) Istituto di Clinica Neurologica, Centro Dino Ferrari, Universita' di Milano, Milano, Italy;(4) Cattedra di Biochimica, Universita' di Bologna, Bologna, Italy;(5) Istituto di Radiologia, Universita' di Modena, Modena, Italy;(6) Clinica Neurologica 2, Policlinico Universitario, I-98125 Messina, Italy |
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Abstract: | A 16-year-old girl presented with early-onset cerebellar ataxia, myoclonus, elevated lactic acidosis and hypogonadotropic hypogonadism. Muscle biopsy specimens revealed fibres with a ragged appearance with increased mitochondria and lipid droplets. Biochemical investigation revealed a deficiency of complexbc
1 (complex III) of the mitochondrial respiratory chain. Genetic analysis did not show either deletions or known mutations of mitochondrial DNA (mtDNA). Phosphorus magnetic resonance spectroscopy (31P-MRS) showed defective energy metabolism in brain and gastrocnemius muscle. A decreased phosphocreatine (PCr) content was found in the occipital lobes accompanied by normal inorganic phosphate (Pi) and cytosolic pH. These findings represented evidence of a high cytosolic adenosine diphosphate concentration and a relatively high rate of metabolism accompanied by a low phosphorylation potential. Muscle31P-MRS showed a high Pi content at rest, abnormal exercise transfer pattern and a low rate of PCr post-exercise recovery. These findings suggested a deficit of mitochondrial function. Therapy with vitamins K3 and C normalized brain31P-MRS indices, whereas it did not affect muscle bioenergetic metabolism. In this patient, the endocrinological disorder is putatively due to a mitochondrial cytopathy. Although an unknown mtDNA mutation cannot be ruled out, the genetic defect may lie in the nuclear genome. |
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Keywords: | Early-onset cerebellar ataxia Myoclonus Mitochondrial complex III deficiency Hypogonadotropic hypogonadism 31P-MR spectroscopy |
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