Title: Mitochondrial dysfunction in a patient with Joubert syndrome
Authors: Morava, E ×
Dinopoulos, A
Kroes, HY
Rodenburg, RJ
van Bokhoven, H
van den Heuvel, Lambertus
Smeitink, JA #
Issue Date: Jun-2005
Publisher: Hippokrates Verlag
Series Title: Neuropediatrics vol:36 issue:3 pages:214-217
Abstract: Joubert syndrome is a genetically heterogeneous disorder. The diagnostic criteria include episodic hyperventilation, abnormal eye movements, psychomotor retardation, hypotonia, ataxia, and the characteristic neuro-imaging findings (molar-tooth sign). Many of these clinical features have been observed in new-borns with mitochondrial disorders as well. Congenital brain malformations, including cerebellar hypoplasia, have been described in pyruvate dehydrogenase deficiency. Malformations of the vermis and the cerebellar peduncles, with the lack of axonal decussations, however, are characteristic for Joubert syndrome but unique in patients with mitochondrial disorders. Here, we describe a child with Joubert syndrome presenting with primary lactic acidemia, decreased pyruvate oxidation rates, decreased ATP production, and a mildly decreased pyruvate dehydrogenase complex activity measured in a fresh muscle biopsy. Sequence analysis of the PDHc E1 alpha gene and the PDHX genes revealed no mutations. The patient received continuous feeding through a feeding tube for two years and showed a significant clinical improvement with a complete resolution of the chronic lactic acidemia. A second muscle biopsy revealed significantly decreased pyruvate oxidation rates and ATP production, but a normal pyruvate dehydrogenase complex activity. We suggest that the described mitochondrial dysfunction in our patient is secondary to an underlying mutation leading to Joubert syndrome.
ISSN: 0174-304X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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