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[Genetic hemochromatosis]

A M Jouanolle1, V David, J Y Le Gall

  • 1Laboratoire de génétique mol3culaire et hormonologie, Faculté de médecine, Rennes.

Annales De Biologie Clinique
|May 1, 1997
PubMed
Summary
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Hereditary hemochromatosis, a common genetic disorder of iron metabolism, involves excessive dietary iron absorption. Early diagnosis and phlebotomy treatment significantly improve patient life expectancy.

Area of Science:

  • Genetics
  • Iron Metabolism
  • Molecular Biology

Context:

  • Hereditary hemochromatosis is the most prevalent genetic disease among Northern Europeans.
  • The molecular underpinnings of this iron overload disorder are not fully elucidated.
  • Excessive dietary iron absorption occurs via the duodenal mucosa.

Purpose:

  • To understand the genetic basis of hereditary hemochromatosis.
  • To identify the gene responsible for the disorder.
  • To evaluate the impact of genetic testing on diagnosis and counseling.

Summary:

  • The hereditary hemochromatosis gene, encoding a HLA class I related protein, has been identified.
  • A specific missense mutation, C282Y, is found in the homozygous state in over 92% of affected patients.

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  • Direct genetic testing for this mutation facilitates accurate diagnosis and informs genetic counseling.

    • Impact:

    • Early diagnosis and phlebotomy treatment before organ damage lead to normal life expectancy.
    • Identification of the causative gene and common mutation revolutionizes diagnostic approaches.
    • Genetic screening enables proactive management and prevention of severe clinical complications like cardiac failure and hepato-carcinoma.