AI Insight
This study identifies a regulatory mechanism controlling fetal hemoglobin production involving two key proteins: BACH2 and NRF2. The research shows that BACH2 normally suppresses the activation of γ-globin genes that encode fetal hemoglobin, while reducing BACH2 levels allows NRF2 to occupy chromatin more extensively and promote activation of these genes. This genetic pathway represents a previously uncharacterized axis controlling the switch between fetal and adult hemoglobin expression.
Why it matters
Understanding how to reactivate fetal hemoglobin production in adults has significant therapeutic potential for treating hemoglobin disorders like sickle cell disease and beta-thalassemia, as fetal hemoglobin can compensate for defective adult hemoglobin. The BACH2-NRF2 axis could represent a new druggable target for increasing fetal hemoglobin levels in patients with these conditions.
Understand the Science
Nature, Published online: 30 September 2026; doi:10.1038/s41586-026-11113-2
BACH2 restrains activation of the fetal-haemoglobin-encoding γ-globin genes, while loss of BACH2 enhances NRF2 chromatin occupancy and promotes the formation of activation foci at the γ-globin genes.
Source: Human genetics implicates a BACH2–NRF2 axis in fetal haemoglobin activation