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Multiple oxidative phosphorylation deficiencies in severe childhood multi-system disorders due to polymerase gamma (POLG1) mutations.
Maaike C de Vries, Richard J Rodenburg, Eva Morava, Edwin P M van Kaauwen, Henk ter Laak, Reinier A Mullaart, Irina N Snoeck, Peter M van Hasselt, Peter Harding, Lambert P W van den Heuvel, Jan A M Smeitink,
Failure to thrive, feeding difficulties, variable forms of infantile epilepsy or psychomotor developmental delay and hypotonia were the most frequent clinical disease presentations in eight children with combined oxidative phosphorylation enzyme complex deficiencies carrying mutations in the polymerase gamma (POLG1) gene. Five out of eight patients developed severe liver dysfunction during the course of the disease. Three of these patients fulfilled the disease criteria for Alpers syndrome. Most children showed deficiencies of respiratory chain enzyme complexes I and III, in combination with complex II, complex IV and/or PDHc in muscle, whereas in fibroblasts normal enzyme activities were measured. All children carried homozygous or compound heterozygous mutations in the POLG1 gene, including two novel mutations in association with mtDNA depletion. Conclusion We suggest performing POLG1 mutation analysis in children with combined oxidative phosphorylation deficiencies in muscle, even if the clinical picture is not Alpers syndrome.
European journal of pediatrics - Mar 2007
A novel POLG gene mutation in 4 children with Alpers-like hepatocerebral syndromes.
Bulent Kurt, Jaak Jaeken, Johan Van Hove, Lieven Lagae, Ann Löfgren, David B Everman, Parul Jayakar, Ali Naini, Klaas J Wierenga, Gert Van Goethem, William C Copeland, Salvatore DiMauro,
To describe a novel POLG missense mutation (c.3218C>T; p.P1073L) that, in association with 2 previously described mutations, caused an Alpers-like hepatocerebral syndrome in 4 children.
Archives of neurology - Feb 2010