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Strict in vivo specificity of the Bcl11a erythroid enhancer.

Blood. 2016 Nov 10;128(19):2338-2342. Epub 2016 Oct 05
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摘要


BCL11A, a repressor of human fetal (γ-)globin expression, is required for immune and hematopoietic stem cell functions and brain development. Regulatory sequences within the gene, which are subject to genetic variation affecting fetal globin expression, display hallmarks of an erythroid enhancer in cell lines and transgenic mice. As such, this enhancer is a novel, attractive target for therapeutic gene editing. To explore the roles of such sequences in vivo, we generated mice in which the orthologous 10-kb intronic sequences were removed. Bcl11a enhancer-deleted mice, Bcl11a(Δenh), phenocopy the BCL11A-null state with respect to alterations of globin expression, yet are viable and exhibit no observable blood, brain, or other abnormalities. These preclinical findings provide strong in vivo support for genetic modification of the enhancer for therapy of hemoglobin disorders.

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