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Hemoglobin S Polymerization (HbS Polymerization)
- Target
- HbS Polymerization
- Molecular classification
- Protein aggregation, Macromolecular assembly
01
Overview
Hemoglobin S (HbS) polymerization is the central molecular event underlying sickle cell disease (SCD). It occurs when deoxygenated HbS molecules aggregate to form long, rigid fibers within red blood cells. This process distorts the shape of erythrocytes, leading to their characteristic "sickled" appearance and resulting in impaired blood flow, hemolysis, and a range of acute and chronic complications. The polymerization is triggered by a single point mutation in the β-globin gene (β6 Glu→Val) and is influenced by factors such as oxygen tension, hemoglobin concentration, and the presence of other hemoglobins like fetal hemoglobin (HbF). Preventing or reversing HbS polymerization is a major therapeutic strategy.
- Other names
- Sickle Hemoglobin PolymerizationHbS AggregationDeoxy-HbS Polymerization
02
Mechanism of action
Allosteric modulation of hemoglobin oxygen affinity to prevent deoxygenation-induced polymerization
03
Biological functions
Red blood cell structureOxygen transport impairmentVaso-occlusion
04
Disease associations
Sickle cell diseaseVaso-occlusive crisisHemolytic anemiaIschemia-reperfusion injury
05
Safety considerations
Risk of vaso-occlusionPotential for increased blood viscosity with excessive hemoglobin levelsDrug-specific side effects
06
Interacting drugs
Voxelotor
07
Biomarkers
HbS concentrationHbF concentrationReticulocyte countHemoglobin levelMarkers of hemolysis (e.g., LDH, bilirubin)
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