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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]
Hemochromatosis type 4 is a hereditary iron overload disorder that affects ferroportin, an iron transport protein needed to export iron from cells into circulation. [1] Although the disease is rare, it is found throughout the world and affects people from various ethnic groups.
Mutations in the ferroportin gene are known to cause an autosomal dominant form of iron overload known as Hemochromatosis type 4 or Ferroportin Disease. The effects of the mutations are generally not severe but a spectrum of clinical outcomes are seen with different mutations.
Hemochromatosis type 1: HFE (chromosome 6) recessive. ... autosomal dominant, autosomal recessive or X-linked recessive 2-6:100,000 Hermansky–Pudlak syndrome:
Haemochromatosis type 3 is a type of iron overload disorder associated with deficiencies in transferrin receptor 2.It exhibits an autosomal recessive inheritance pattern. [2] [3] [4] The first confirmed case was diagnosed in 1865 by French doctor Trousseau.
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.
The iron storage disorder hereditary hemochromatosis (HHC) is an autosomal recessive genetic disorder that usually results from defects in this gene. The disease-causing genetic variant most commonly associated with hemochromatosis is p. C282Y. [14]
Clinically, most cases of hemochromatosis are found in homozygotes for the most common mutation in the HFE gene. [1] But at each gene locus associated with the disease, there is the possibility of compound heterozygosity, often caused by inheritance of two unrelated alleles, of which one is a common or classic mutation, while the other is a ...