Oxoglutaric aciduria

Oxoglutaric aciduria (also known as alpha-ketoglutaric aciduria or 2-oxoglutaric aciduria) is a rare inherited metabolic disorder characterized by elevated levels of alpha-ketoglutaric acid (2-oxoglutaric acid) in the urine. This condition is caused by a deficiency in the mitochondrial enzyme alpha-ketoglutarate dehydrogenase complex, which plays a critical role in the Krebs cycle (citric acid cycle), the central energy-producing pathway in cells. The deficiency impairs cellular energy metabolism and primarily affects the nervous system, though multiple organ systems can be involved. Clinical features typically present in early life and include developmental delay, intellectual disability, hypotonia (decreased muscle tone), seizures, and metabolic acidosis. Some patients may also exhibit progressive neurological deterioration, movement abnormalities, and failure to thrive. The severity of the condition is variable, ranging from severe neonatal presentations with lactic acidosis and early death to milder forms with predominantly developmental concerns. Brain imaging may show structural abnormalities or white matter changes. Diagnosis is established through organic acid analysis of urine, which reveals markedly elevated 2-oxoglutaric acid, and can be confirmed by enzymatic assay or molecular genetic testing. There is currently no curative treatment for oxoglutaric aciduria. Management is primarily supportive and symptomatic, including dietary modifications, supplementation with cofactors such as thiamine (vitamin B1, a cofactor for the alpha-ketoglutarate dehydrogenase complex), management of seizures with anticonvulsant medications, and physical and developmental therapies. Monitoring and treatment of metabolic crises, particularly during periods of illness or physiological stress, are important components of care.

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