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• W3000224905 abstract "Abstract Fetal development and anemias such as β-hemoglobinopathies trigger rapid production of red blood cells in a process known as stress erythropoiesis. Cellular stress prompts differentiating erythroid precursors to express high levels of fetal γ-globin, which has suggested strategies to treat hemoglobinopathies such as thalassemia and sickle cell disease. However, the mechanisms underlying γ-globin production during cellular stress are still poorly defined. Here we use CRISPR-Cas genome editing and CRISPRi transcriptional repression to model the stress caused by reduced levels of adult β-globin. We find that loss of β-globin is sufficient to induce widespread globin compensation, including robust re-expression of γ-globin. Time-course RNA-seq of differentiating isogenic erythroid precursors identified the ATF4 transcription factor as a causal regulator of this response. ChIP-seq of multiple erythroid precursor genotypes and differentiation states revealed that β-globin knockout leads to reduced engagement of ATF4 targets involved in the unfolded protein response. This ATF4 program indirectly regulates the levels of BCL11A, a key repressor of γ-globin. Identification of ATF4 as a key regulator of globin compensation adds mechanistic insight to the poorly understood phenomenon of stress-induced globin compensation and could be relevant for proposed gene editing strategies to treat hemoglobinopathies." @default.
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• W3000224905 date "2020-01-15" @default.
• W3000224905 modified "2023-09-26" @default.
• W3000224905 title "ATF4 mediates fetal globin upregulation in response to reduced β-globin" @default.
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• W3000224905 doi "https://doi.org/10.1101/2020.01.15.905943" @default.
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