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• W2111983406 abstract "Advances in iron metabolism have allowed a novel classification of iron disorders and to identify previously unknown diseases. These disorders include genetic iron overload (hemochromatosis) and inherited iron-related anemias, in some cases accompanied by iron overload. Rare inherited anemias may affect the hepcidin pathway, iron absorption, transport, utilization and recycling. Among the genetic iron-related anemias the most common form is likely the iron-refractory iron-deficiency anemia (IRIDA), due to mutations of the hepcidin inhibitor TMPRSS6 encoding the serine protease matriptase-2. IRIDA is characterized by hepcidin up-regulation, decrease iron absorption and macrophage recycling and by microcytic- hypochromic anemia, unresponsive to oral iron. High serum hepcidin levels may suggest the diagnosis, which requires demonstrating the causal TMPRSS6 mutations by gene sequencing. Other rare microcytic hypochromic anemias associated with defects of iron transport-uptake are the rare hypotransferrinemia, and DMT1 and STEAP3 mutations. The degree of anemia is variable and accompanied by secondary iron overload even in the absence of blood transfusions. This is due to the iron-deficient or expanded erythropoiesis that inhibits hepcidin transcription, increases iron absorption, through the erythroid regulator, as in untransfused beta-thalassemia. Sideroblastic anemias are due to decreased mitochondrial iron utilization for heme or sulfur cluster synthesis. Their diagnosis requires demonstrating ringed sideroblasts by Perl’s staining of the bone marrow smears. The commonest X-linked form is due to deltaamino- levulinic-synthase-2-acid (ALAS2) mutations. The recessive, more severe form, affects SLC25A38, which encodes a potential mitochondrial importer of glycine, an amino acid essential for ALA synthesis and thus results in heme deficiency. Two disorders affect iron/sulfur cluster biogenesis: deficiency of the ATP-binding cassette B7 (ABCB7) causes X-linked sideroblastic anemia/ataxia, likely impairing the activity of ferrochelatase, which is an iron/sulfur-cluster- dependent enzyme. A recessive form affects GLRX5, a protein involved in the iron/sulfur cluster biogenesis. Aceruloplasminemia is a rare recessive syndrome characterized by anemia, diabetes, retinal degeneration, ataxia and other neurological symptoms, low serum iron but high serum ferritin, due to decreased iron recycling from macrophages and other cells. The study of these rare conditions has greatly contributed to our understanding of iron transport, utilization and recycling. Their distinction is clinically essential in order to plan the best treatment." @default.
• W2111983406 created "2016-06-24" @default.
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• W2111983406 date "2013-03-26" @default.
• W2111983406 modified "2023-09-28" @default.
• W2111983406 title "Genetic/metabolic effect of iron metabolism and rare anemias" @default.
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• W2111983406 doi "https://doi.org/10.4081/thal.2013.s1.e4" @default.
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