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Mucopolysaccharidosis type II--genotype/phenotype aspects

R Froissart1, I Moreira da Silva, N Guffon

  • 1Paediatric Biochemistry Department, Debrousse Hospital, Lyon, France.

Acta Paediatrica (Oslo, Norway : 1992). Supplement
|February 8, 2003
PubMed
Abstract

Insights

Genotype-phenotype correlations in mucopolysaccharidosis type II (MPS II) are challenging due to enzyme activity measurement limitations. Patient response to bone marrow transplantation suggests genotype is crucial for guiding MPS II treatment.

Area of Science:

  • Biochemistry
  • Genetics
  • Rare Diseases

Background:

  • Mucopolysaccharidosis type II (MPS II), or Hunter disease, exhibits significant clinical heterogeneity.
  • Current enzyme activity assays for iduronate-2-sulphatase (IDS) in MPS II lack the sensitivity to distinguish between absent and residual enzyme function.
  • This limitation hinders accurate prediction of disease severity and prognosis.

Purpose of the Study:

  • To explore the challenges and benefits of establishing genotype-phenotype correlations in lysosomal storage diseases, using MPS II as a model.
  • To investigate the relationship between genetic mutations and clinical presentation in MPS II patients.
  • To assess the utility of genotype information in guiding treatment decisions for MPS II.

Main Methods:

  • Analysis of genotype-phenotype relationships in MPS II patients.
  • Evaluation of iduronate-2-sulphatase (IDS) enzyme activity.
  • Assessment of patient responses to allogenic bone marrow transplantation.

Main Results:

  • Genotype-phenotype correlations in MPS II are complex and not always predictable based on residual enzyme activity.
  • Gene analysis, expression, and transcript studies do not consistently predict a patient's clinical phenotype.
  • Variability in bone marrow transplant outcomes highlights the influence of specific genotypes.

Conclusions:

  • Establishing definitive genotype-phenotype correlations in MPS II is difficult due to limitations in measuring enzyme activity.
  • The variable response to bone marrow transplantation underscores the importance of genetic profiling for personalized MPS II therapy selection.

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