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Hyperpipecolic acidaemia: a diagnostic tool for peroxisomal disorders.

Antonella Peduto1, Matthias R Baumgartner, Nanda M Verhoeven

  • 1Department of Pediatrics, University of Turin, Italy.

Molecular Genetics and Metabolism
|July 6, 2004
PubMed
Summary

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Pipecolic acid is a valuable biomarker for diagnosing peroxisomal disorders. Elevated levels indicate generalized defects, while normal levels with abnormal fatty acids suggest specific enzyme deficiencies.

Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Peroxisomal disorders represent a heterogeneous group of diseases with diverse clinical and biochemical presentations.
  • Accurate diagnosis relies on specialized assays to study peroxisome metabolism.
  • Pipecolic acid evaluation is recognized as a supplementary diagnostic test.

Observation:

  • This study investigated the diagnostic utility of pipecolic acid in 30 patients with confirmed peroxisomal defects.
  • Patients included various conditions such as Zellweger syndrome, Infantile Refsum disease, and rhizomelic chondrodysplasia punctata (RCDP).
  • Pipecolic acid levels were analyzed in conjunction with very long-chain fatty acid concentrations.

Findings:

  • Increased pipecolic acid was observed in all generalized peroxisomal disorders.

Related Experiment Videos

  • Normal pipecolic acid with abnormal very long-chain fatty acids strongly indicated single peroxisomal enzyme deficiencies.
  • Unexpectedly, elevated pipecolic acid was also found in a child with RCDP and two patients with Refsum disease.
  • In six cases, a pipecolic acid peak detected during general metabolic screening prompted further investigation for peroxisomal disorders.

    • Implications:

    • Pipecolic acid serves as a useful parameter for the biochemical classification of peroxisomal disorders.
    • Its measurement aids in differentiating between generalized peroxisomal defects and single enzyme deficiencies.
    • The findings expand the understanding of pipecolic acid's role in diagnosing specific peroxisomal conditions, including RCDP and Refsum disease.