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Related Experiment Videos

Genotype-phenotype pitfalls in Gaucher disease

P M Strasberg1, B L Triggs-Raine, I B Warren

  • 1Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada.

Journal of Clinical Laboratory Analysis
|January 1, 1994
PubMed
Summary

Gaucher disease (GD) mutations, specifically the L444P/L444P genotype, can lead to severe visceral disease and late-onset neurological symptoms, challenging initial type I classification.

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Area of Science:

  • Genetics
  • Biochemistry
  • Neurology

Background:

  • Gaucher disease (GD) is an inherited lysosomal storage disorder caused by beta-glucocerebrosidase deficiency.
  • GD is classified into types I, II, and III based on the presence and progression of central nervous system (CNS) involvement.

Observation:

  • The common A5841->G (N370S) mutation predicts type I GD, while T6433->C (L444P) usually indicates type III.
  • Type II GD patients often have the T6433->C allele combined with a fusion gene.
  • A Caucasian boy with homozygous L444P mutations, initially classified as type I, died from severe visceral GD before age 3.

Findings:

  • Homozygous T6433C (L444P) point mutations were detected using selective PCR.
  • A novel PCR procedure confirmed homozygous point mutations and differentiated between normal and fusion genes.

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  • Post-mortem examination revealed neuronal complex lipid accumulation, consistent with late-onset type III GD.

    • Implications:

    • The L444P/L444P genotype can present as severe visceral GD with delayed neurological findings, necessitating reclassification to type III.
    • Genetic analysis, particularly identifying specific mutations like L444P, is crucial for accurate GD classification and predicting disease course.
    • This challenges the traditional classification based solely on initial clinical presentation and highlights the importance of genetic markers in understanding GD subtypes.