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Mutation analysis in hereditary hemochromatosis

E Beutler1, T Gelbart, C West

  • 1Scripps Research Institute, Department of Molecular and Experimental Medicine, La Jolla, CA 92037, USA.

Blood Cells, Molecules & Diseases
|January 1, 1996
PubMed
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Idiopathic hemochromatosis is strongly linked to the 845A (C282Y) mutation, with homozygotes showing high penetrance. The 187G (H63D) mutation appears to have low penetrance, even when combined with 845A.

Area of Science:

  • Genetics
  • Molecular Biology
  • Medical Genetics

Background:

  • Idiopathic hemochromatosis is a genetic disorder characterized by excessive iron absorption.
  • Mutations in the HLA-H gene, specifically at nt 845 (C282Y) and nt 187 (H63D), are implicated in hemochromatosis pathogenesis.
  • Understanding the penetrance and linkage disequilibrium of these mutations is crucial for diagnosis and genetic counseling.

Purpose of the Study:

  • To investigate the prevalence and linkage disequilibrium of HLA-H gene mutations (nt 845 and nt 187) in patients with idiopathic hemochromatosis and healthy controls.
  • To determine the penetrance of different genotypes, particularly homozygous 845A and compound heterozygous 845A/187G, in causing hemochromatosis.
  • To assess the utility of screening for specific genotypes in diagnosing hemochromatosis.

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Main Methods:

  • DNA analysis of 147 idiopathic hemochromatosis patients and 193 controls of European origin.
  • Genotyping for mutations at nt 845 (C282Y) and nt 187 (H63D) within the HLA-H gene.
  • Statistical analysis to determine allele frequencies, linkage disequilibrium, and genotype penetrance.

Main Results:

  • The 845A (C282Y) mutation was found in 82.3% of hemochromatosis patients as homozygotes and 6.8% as heterozygotes.
  • Complete linkage disequilibrium was observed between the nt 845 and nt 187 mutations, with nt 187 being C on chromosomes carrying 845A.
  • The penetrance of the homozygous 845A/845A genotype was high, while the penetrance of the 845A/187G genotype was low (1.5% in this study, 0.5% from prior data).

Conclusions:

  • The homozygous 845A (C282Y) genotype is a strong predictor of idiopathic hemochromatosis due to its high penetrance.
  • The 187G (H63D) mutation, while present in controls, shows low penetrance, especially in compound heterozygotes with 845A.
  • Screening for the homozygous 845A genotype is a valuable diagnostic tool for idiopathic hemochromatosis.