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Thalassemias

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1. (2 Points) Thalassemias are genetic anemias in which hemoglobin is mutated and is not able to correctly function. Thalassemic individuals exhibit major changes in body iron status. Name two clinical indicators of body iron status and indicate how these indicators change in iron deficiency and the extent to which similar changes might be expected in thalassemic individuals.

Thalassemias are inherited hematologic disorders as a result of defects on one or more of hemoglobin chains. They include ∝ and β categories. ∝ Thalassemias occur as a result of reduced or absent ∝ globin chains while thalassemia is as a result of absent or reduced β globin chains. Clinical indicators of body iron status during deficiency that are similar to changes …show more content…
When cellular iron levels are low, the protein binds to iron-responsive elements (IREs), which are stem-loop structures found in the 5' UTR of ferritin mRNA, and in the 3' UTR of transferrin receptor mRNA. When the protein binds to IRE, it results in repression of translation of ferritin mRNA, and inhibition of degradation of the otherwise rapidly degraded transferrin receptor mRNA thus increasing the formation of aconitase. During iron overload, the aconitase mRNA detaches from the IRE thus suppressing the translation of aconitase. Drosophila succinate dehydrogenase mRNA (DSD mRNA): the protein formed is succinate dehydrogenase which forms part of complex II of the Electron Transport Chain [ETC]. It performs an important role in linking the TCA to the ETC. During an iron overload, the DSD mRNA receptor attaches to the IRE which causing the transcription of Drosophila succinate dehydrogenase that will increase ETC reactions in complex II. In a state of iron deficiency, DSD mRNA receptor mRNA detaches from the IRE and thus suppresses the formation of the protein Drosophila succinate

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