Hemoglobin A inhibits the formation of the long fibers of...

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Key Concepts

Hemoglobin S Polymerization

Hemoglobin S has a structural mutation that creates a hydrophobic patch on its surface. In the deoxygenated state, this altered region facilitates abnormal interactions between hemoglobin S molecules, leading to their polymerization into long fibers. These fibers distort red blood cells into the characteristic sickle shape and are central to the pathogenesis of sickle cell disease.

Molecular Dilution and Inhibition of Polymer Formation

Hemoglobin A, which lacks the mutation present in hemoglobin S, does not participate in the polymerization process. When hemoglobin A is present, as in individuals with sickle cell trait, it effectively dilutes the concentration of hemoglobin S and disrupts the intermolecular contacts necessary for fiber formation. This interference slows or prevents the polymerization of hemoglobin S, thereby inhibiting the sickling of red cells upon deoxygenation.

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