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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
[Pathophysiology and genetics of classic HFE (type 1) hemochromatosis].
La Presse Médicale 2007 September
Hereditary type 1 HFE hemochromatosis is associated with homozygosity for the p.Cys282Tyr mutation of the HFE gene (C282Y mutation). The p.Cys282Tyr mutation of the HFE gene leads to an abnormal reduction in hepatic expression of hepcidin, a protein that appears to control the release of iron from enterocytes and macrophages towards plasma. Abnormally low hepcidin levels promote an increase in the bioavailability of plasma iron, characterized by elevated transferrin saturation and the appearance of non transferrin bound iron. This nontransferrin-bound iron is avidly taken up by the liver, heart, and pancreas, the principal target organs for systemic iron overload. The variable penetrance of this disease is related to environmental and genetic factors. Among the genetic factors, mutations of some newly identified genes may aggravate the phenotype of iron overload associated with homozygosity for the p.Cys282Tyr mutation of the HFE gene; these new genes include those of hemojuvelin (HJV), transferrin receptor 2 (TfR2), and hepcidin (HAMP).
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