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Serum bilirubin is an important antioxidant that is found at increased levels in hereditary hemochromatosis patients. We hypothesized that increased levels of serum bilirubin may play a protective role against oxidative stress induced by iron overload in carriers of mutations in the hereditary hemochromatosis gene (HFE). We studied the relation between serum total bilirubin, serum iron levels, the HFE C282Y and H63D mutations, and mortality. The study was conducted in 2,332 randomly selected subjects from the Rotterdam Study, a population-based follow-up study of people aged 55 years or over. Serum bilirubin levels were significantly correlated with serum iron (Pearson's correlation coefficient (r) = 0.4, P < 0.001), transferrin saturation (r = 0.4, P < 0.001), and serum ferritin (r = 0.2, P < 0.05). Carriers of the HFE mutations had higher levels of bilirubin compared to wild-type homozygotes. The relation was the strongest in H63D heterozygotes or homozygotes and C282Y heterozygotes. High levels of serum bilirubin were associated with a 2.8 (95% CI 0.9-8.8) fold reduction in mortality in H63D homozygotes and a 2.2 (1.0-4.7) fold reduction in mortality in C282Y heterozygotes. Taken together, our data suggest that the high levels of the antioxidant bilirubin may counteract the adverse effect of oxidative stress induced by iron overload. This may explain in part the reduced penetrance of the HFE mutations.

Original publication

DOI

10.1002/ajmg.a.30163

Type

Journal article

Journal

American journal of medical genetics. Part A

Publication Date

08/2004

Volume

129A

Pages

39 - 43

Addresses

Department of Epidemiology and Biostatistics, Erasmus MC, Rotterdam, The Netherlands.

Keywords

Humans, Hemochromatosis, Iron Overload, Iron, Bilirubin, Membrane Proteins, Histocompatibility Antigens Class I, Survival Rate, Analysis of Variance, Chi-Square Distribution, Survival Analysis, Follow-Up Studies, Gene Frequency, Heterozygote, Homozygote, Mutation, Time Factors, Aged, Middle Aged, Female, Male, Hemochromatosis Protein