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Martyn, Gabriella E; Wienert, Beeke; Yang, Lu; Shah, Manan; Norton, Laura J; Burdach, Jon; Kurita, Ryo; Nakamura, Yukio; Pearson, Richard C M; Funnell, Alister P W; Quinlan, Kate G R; Crossley, Merlin
Nature genetics, 04/2018, Letnik: 50, Številka: 4Journal Article
β-hemoglobinopathies such as sickle cell disease (SCD) and β-thalassemia result from mutations in the adult HBB (β-globin) gene. Reactivating the developmentally silenced fetal HBG1 and HBG2 (γ-globin) genes is a therapeutic goal for treating SCD and β-thalassemia . Some forms of hereditary persistence of fetal hemoglobin (HPFH), a rare benign condition in which individuals express the γ-globin gene throughout adulthood, are caused by point mutations in the γ-globin gene promoter at regions residing ~115 and 200 bp upstream of the transcription start site. We found that the major fetal globin gene repressors BCL11A and ZBTB7A (also known as LRF) directly bound to the sites at -115 and -200 bp, respectively. Furthermore, introduction of naturally occurring HPFH-associated mutations into erythroid cells by CRISPR-Cas9 disrupted repressor binding and raised γ-globin gene expression. These findings clarify how these HPFH-associated mutations operate and demonstrate that BCL11A and ZBTB7A are major direct repressors of the fetal globin gene.
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