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The homozygous HFE-H63D mutation is the cause of classic and treatable hemochromatosis in only 6.7% of its carriers. [25] H63D syndrome is independently a distinct entity, and the incidence in homozygous carriers of the H63D mutation is approximately 10%. [26]
There are five types of hereditary hemochromatosis: type 1, 2 (2A, 2B), 3, 4 [9] and 5, [10] all caused by mutated genes. Hereditary hemochromatosis type 1 is the most frequent, and uniquely related to the HFE gene. It is most common among those of Northern European ancestry, in particular those of Celtic descent. [11]
Iron overload (also known as haemochromatosis or hemochromatosis) is the abnormal and increased accumulation of total iron in the body, leading to organ damage. [1] The primary mechanism of organ damage is oxidative stress, as elevated intracellular iron levels increase free radical formation via the Fenton reaction.
[21] [22] Allele frequencies of H63D in ethnically diverse western European populations are 10-29%. [23] and in North American non-Hispanic whites are 14-15%. [24] At least 42 mutations involving HFE introns and exons have been discovered, most of them in persons with hemochromatosis or their family members. [25] Most of these mutations are rare.
The presence of hemochromatosis may be discovered incidentally on blood testing, or a diagnosis suspected based on symptoms may be supported or ruled out by blood testing. Elevated serum ferritin , an indicator of blood iron levels, and transferrin saturation , which is involved with absorption of iron from the gut, are very common.
Treatment for hemochromatosis type 3 may include reducing iron levels by removing blood (phlebotomy), iron chelation therapy, diet changes, and treatment for complications of the disease. The purpose of the treatment is to reduce the amount of iron in the body to normal levels, prevent or delay organ damage from excess iron, and maintain normal ...
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The lysosomal storage diseases are generally classified by the nature of the primary stored material involved, and can be broadly broken into the following: (ICD-10 codes are provided where available) [citation needed] (E75) Lipid storage disorders. Gangliosidoses (including Tay–Sachs disease (E75.0-E75.1) - they are a subtype of sphingolipidoses