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Intrafamilial variation in hereditary hemochromatosis
1University Hospital, University of Western Ontario, London, Canada.
Digestive Diseases and Sciences
|March 1, 1992
Summary
Hereditary hemochromatosis iron loading varies significantly between siblings, even those genetically identical. Duration of iron accumulation does not solely determine disease severity in hereditary hemochromatosis.
Area of Science:
- Genetics
- Gastroenterology
- Hematology
Background:
- Hereditary hemochromatosis is a genetic disorder characterized by excessive iron absorption.
- The role of genetic factors and environmental influences on iron loading variability is not fully understood.
Purpose of the Study:
- To investigate the variability of iron loading in HLA-identical siblings with hereditary hemochromatosis.
- To determine factors influencing the rate and extent of iron accumulation in families.
Main Methods:
- Review of 57 families with hereditary hemochromatosis.
- Analysis of HLA-identical, sex-matched sibling pairs.
- Assessment of iron loading through liver biopsy, hepatic iron determination, iron absorption studies, and venesection requirements.
Main Results:
- Three families showed greater iron loading in the younger sibling compared to the older sibling.
- Nineteen families showed greater iron loading in the older sibling.
- No significant differences in blood loss, alcohol consumption, or dietary iron intake were identified as explanations.
Conclusions:
- Iron accumulation rates can vary considerably within families affected by hereditary hemochromatosis.
- The extent of iron loading is not solely dependent on the duration of iron accumulation in hereditary hemochromatosis.