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Related Experiment Videos

Glutaric aciduria type I: unusual biochemical presentation.

J Campistol1, A Ribes, L Alvarez

  • 1Servicio Neuropediatria, Hospital Sant Joan de Deu, Barcelona, Spain.

The Journal of Pediatrics
|July 1, 1992
PubMed
Summary

Glutaryl-coenzyme A dehydrogenase deficiency, a rare metabolic disorder, can present atypically. This study highlights normal urine organic acid levels despite typical glutaric aciduria type I symptoms, with elevated markers only in cerebrospinal fluid.

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Area of Science:

  • Biochemistry
  • Metabolic Disorders
  • Neuroscience

Background:

  • Glutaryl-coenzyme A dehydrogenase (GCDH) deficiency causes glutaric aciduria type I (GA-I), a neurometabolic disorder.
  • GA-I is typically diagnosed by elevated urinary levels of glutaric acid and related metabolites.
  • Patients often present with characteristic neurological symptoms.

Observation:

  • A patient with GCDH deficiency (1% residual enzyme activity) exhibited typical GA-I clinical symptoms.
  • However, urine organic acid concentrations remained consistently normal, even during clinical decompensation.
  • Elevated free glutarate was detected exclusively in the cerebrospinal fluid (CSF).

Findings:

  • This case challenges the diagnostic reliance on urinary organic acid profiles for GCDH deficiency.

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  • CSF analysis may be crucial for diagnosing atypical presentations of GA-I.
  • Suggests potential compartmentalization or alternative metabolic pathways affecting glutarate levels.

    • Implications:

    • Revises diagnostic approaches for suspected GCDH deficiency, especially in atypical cases.
    • Highlights the importance of CSF analysis in specific metabolic encephalopathies.
    • Informs understanding of GCDH deficiency pathophysiology and metabolite distribution.