Alpha-globin gene cluster (HBA cluster) (HBA cluster)

The erythroid lineage alpha-globin gene expression pathway is the biological process governing the production of alpha-globin proteins (HBA1 and HBA2) during erythropoiesis (Higgs, 2013, Cold Spring Harb Perspect Med). Located on chromosome 16, the alpha-globin gene cluster is regulated by a series of distal enhancers known as the alpha-globin locus control region or MCS-R elements (NCBI Gene, 2024). This pathway ensures that alpha-globin chains are produced in precise stoichiometric balance with beta-globin chains to form stable hemoglobin tetramers. Proper regulation is essential for the development of functional red blood cells and efficient oxygen transport throughout the body. Mutations or deletions in this pathway result in alpha-thalassemia, a group of hereditary anemias characterized by ineffective erythropoiesis and hemolysis (Piel & Weatherall, 2014, N Engl J Med). Therapeutic strategies targeting this pathway include gene therapy to restore alpha-globin production or the use of erythroid maturation agents like luspatercept to improve red blood cell quality (FDA, 2019). While not a single protein target, the pathway's regulatory elements are increasingly viewed as sites for therapeutic intervention via gene editing.

Other names

Alpha-globin locusHBA1/HBA2 gene expression pathwayErythroid alpha-globin synthesisHemoglobin subunit alpha cluster

Modulation of erythroid maturation, reduction of globin chain imbalance, or direct gene editing of the HBA1/HBA2 locus.