Hemoglobin subunit gamma-2 (HBG2)

Hemoglobin subunit gamma-2 is a globin protein encoded by the HBG2 gene and forms part of fetal hemoglobin (HbF), comprising two alpha and two gamma chains. This subunit predominates at birth and is essential for oxygen transport in fetal development, with expression normally silenced postnatally. Persistent or reactivated HBG2 expression can ameliorate clinical severity in hemoglobinopathies such as sickle cell disease and beta-thalassemia. Genetic variations in the HBG2 promoter and regulatory pathways control its expression, making HBG2 a major therapeutic target for pharmacologic and gene editing strategies seeking to increase HbF in affected patients

Other names

HBG2HBG-T1Gamma-2-globinHemoglobin gamma-2 chainHemoglobin gamma-G chainfetal hemoglobin F subunit gamma 2TNCYG-gamma globin

Activation of HBG2 promoter to induce HbF synthesis (by hydroxyurea, decitabine, butyrate derivatives) Epigenetic modulation of transcriptional regulators/repressor complexes (e.g., BCL11A, NuRD)