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Updated: Aug 17, 2026

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
Published on: April 4, 2018
The gene mutated in l-2-hydroxyglutaric aciduria encodes l-2-hydroxyglutarate dehydrogenase
R Rzem1, E Van Schaftingen, M Veiga-da-Cunha
1Laboratory of Physiological Chemistry, ICP and Université Catholique de Louvain, UCL 7539, Avenue Hippocrate 75, 1200 Brussels, Belgium.
Abstract:
The biochemical defect in L-2-hydroxyglutaric aciduria is still unknown, but the mutated gene has recently been identified on chromosome 14q22. Transfection of human embryonic kidney (HEK) cells with a cDNA encoding the product of the human gene led to a>15-fold increase in L-2-hydroxyglutarate dehydrogenase activity. The overexpressed enzyme had similar biochemical characteristics (including sensitivity to FAD and association with membranes) as the rat liver enzyme. Western blot analysis indicated that it is processed through the removal of a N-terminal approximately 4 kDa fragment, in agreement with a mitochondrial localization. Transfection experiments indicated that the mutations (K81E, E176D, Delta-exon9) found in patients with L-2-hydroxyglutaric aciduria suppressed L-2-hydroxyglutarate dehydrogenase activity. Western blot analysis showed that the three mutated proteins were expressed to various degrees in HEK cells, but were abnormally processed. Taken together, these data indicate that L-2-hydroxyglutaric aciduria is due to a deficiency in L-2-hydroxyglutarate dehydrogenase.
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