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Glutaric aciduria: biochemical and morphologic considerations

S I Goodman, M D Norenberg, R H Shikes

    The Journal of Pediatrics
    |May 1, 1977
    PubMed
    Summary
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    Glutaric aciduria is a metabolic disorder. Studies show a deficiency in glutaryl-CoA dehydrogenase, leading to toxic metabolite buildup and severe neurological damage.

    Area of Science:

    • Biochemistry
    • Medical Genetics
    • Neuropathology

    Background:

    • Glutaric aciduria is a rare inherited metabolic disorder.
    • It is characterized by the accumulation of toxic metabolites.
    • Understanding the underlying biochemical defect is crucial for diagnosis and management.

    Purpose of the Study:

    • To investigate the biochemical and morphologic findings in a patient with glutaric aciduria.
    • To identify the specific enzyme deficiency responsible for the condition.
    • To correlate biochemical findings with neuropathological changes.

    Main Methods:

    • Biochemical analysis of urine and liver mitochondria.
    • Morphological examination of brain, liver, kidney, and myocardium.
    • Enzyme activity assays on patient-derived mitochondria.

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    Main Results:

    • Elevated levels of glutaric acid, alpha-aminoadipic acid, and saccharopine were detected.
    • Mutant liver mitochondria showed impaired oxidation of glutaryl-CoA to glutaconyl-CoA.
    • Deficiency of glutaryl-CoA dehydrogenase was confirmed.
    • Autopsy revealed cerebral edema, neuronal changes, and striatal degeneration, along with organ fatty changes.

    Conclusions:

    • The study confirms glutaryl-CoA dehydrogenase deficiency as the cause of glutaric aciduria in this patient.
    • The biochemical defect leads to toxic metabolite accumulation and severe neuropathology.
    • These findings highlight the importance of early diagnosis and intervention for glutaric aciduria.