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Zellweger syndrome and associated phenotypes

D R FitzPatrick1

  • 1Department of Clinical and Human Genetics, Western General Hospital NHS Trust, Edinburgh, UK.

Journal of Medical Genetics
|October 1, 1996
PubMed
Summary

Peroxisomes are versatile organelles involved in various cellular functions. Zellweger syndrome, a peroxisomal disorder, presents a spectrum of symptoms, and milder variants are diagnosable with biochemical assays.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Genetics

Background:

  • Peroxisomes, once viewed as simple H2O2 producers, are now recognized as vital organelles with complex metabolic roles.
  • Zellweger syndrome (ZS) exemplifies human peroxisomal disorders, presenting severe neonatal symptoms including hypotonia and developmental delay.
  • ZS represents the severe end of a spectrum of Zellweger-like syndromes with variable clinical presentations.

Purpose of the Study:

  • To highlight the evolving understanding of peroxisome function.
  • To emphasize the broad phenotypic spectrum of Zellweger-like syndromes.
  • To inform clinical geneticists about milder variants and diagnostic approaches.

Main Methods:

  • Review of peroxisome biology and peroxisomal disorders.
  • Clinical characterization of Zellweger syndrome and related conditions.
  • Discussion of biochemical assays for peroxisomal function, such as serum very-long-chain fatty acid (VLCFA) ratios and platelet dihydroxyacetone phosphate acyltransferase (DHAP-AT) activity.

Main Results:

  • Peroxisomes perform diverse catabolic and biosynthetic functions.
  • Zellweger-like syndromes exhibit a wide range of clinical severity, extending beyond neonatal presentation.
  • Biochemical assays offer sensitive and specific methods for diagnosing peroxisomal dysfunction.

Conclusions:

  • The peroxisome is a dynamic organelle with critical cellular functions.
  • Awareness of milder Zellweger-like syndromes is crucial for timely diagnosis.
  • Biochemical testing facilitates the identification of these peroxisomal disorders across different age groups.

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