Hemoglobin subunit alpha 1 (HBA1)

Hemoglobin subunit alpha 1 (HBA1) is a critical protein component of the adult hemoglobin tetramer (HbA), which consists of two alpha and two beta subunits. Encoded by the HBA1 gene, this protein is primarily responsible for the transport of oxygen from the lungs to peripheral tissues and the delivery of carbon dioxide back to the lungs. Beyond its primary role in gas exchange, HBA1 has non-canonical functions, such as modulating nitric oxide signaling at myoendothelial junctions to regulate vascular reactivity and exhibiting peroxidase activity. Defects in HBA1, including deletions and point mutations, are the underlying cause of alpha-thalassemia and other hemoglobinopathies, which result in impaired red blood cell function and anemia. In conditions like sickle cell disease, HBA1 is a therapeutic target for drugs such as Voxelotor, which binds to the alpha chain to increase hemoglobin's oxygen affinity and prevent the polymerization of sickle hemoglobin. Emerging therapeutic strategies also include gene-editing technologies like CRISPR to correct genetic defects or reactivate fetal hemoglobin production to compensate for HBA1 deficiency. Additionally, the glycated form of this protein, HbA1c, serves as a vital clinical biomarker for monitoring long-term glycemic control in diabetic patients.

Other names

Alpha-globinHemoglobin alpha-1 chainHemoglobin alpha chainHBA1HBA-T3HBHMETHBAECYT7Hemopressin

Hemoglobin HbA positive modulator; stabilization of oxygenated hemoglobin state; inhibition of hemoglobin S polymerization