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Pyridoxine-dependent epilepsy (PDE) is an inborn error of metabolism resulting from antiquitin deficiency. There is marked elevation of α-amino adipic semi-aldehyde (αAASA), piperidine-6-carboxylate (P6C) and pipecolic acid. The diagnosis can be confirmed by identifying the mutation in the ALDH7A1 gene in chromosome 5q3l. An 8-year-old Indian girl presented with severe developmental delay and seizures and was found to have pyridoxine-dependent epilepsy owing to an antiquitin mutation. Genetic evaluation of the parents allowed antenatal diagnosis to be made during the next pregnancy.
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