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Induction of Human Fetal Globin Gene Expression by a Novel Erythroid Factor, NF-E4

机译:新型类红细胞因子NF-E4诱导人胎球蛋白基因表达

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The stage selector protein (SSP) is a heteromeric complex involved in preferential expression of the human γ-globin genes in fetal-erythroid cells. We have previously identified the ubiquitous transcription factor CP2 as a component of this complex. Using the protein dimerization domain of CP2 in a yeast two-hybrid screen, we have cloned a novel gene, NF-E4, encoding the tissue-restricted component of the SSP. NF-E4 and CP2 coimmunoprecipitate from extract derived from a fetal-erythroid cell line, and antiserum to NF-E4 ablates binding of the SSP to the γ promoter. NF-E4 is expressed in fetal liver, cord blood, and bone marrow and in the K562 and HEL cell lines, which constitutively express the fetal globin genes. Enforced expression of NF-E4 in K562 cells and primary erythroid progenitors induces endogenous fetal globin gene expression, suggesting a possible strategy for therapeutic intervention in the hemoglobinopathies.
机译:阶段选择器蛋白(SSP)是一种异源复合物,参与人γ-珠蛋白基因在胎儿类红细胞中的优先表达。我们之前已经确定了普遍存在的转录因子CP2是这种复合物的组成部分。在酵母双杂交筛选中,使用CP2的蛋白质二聚结构域,我们克隆了一个新的基因NF-E4,该基因编码SSP的组织限制性成分。 NF-E4和CP2从胎儿红系细胞系提取物中共免疫沉淀,而针对NF-E4的抗血清则消除了SSP与γ启动子的结合。 NF-E4在胎儿肝,脐带血和骨髓中以及在K562和HEL细胞系中表达,它们组成性地表达胎儿珠蛋白基因。 NF-E4在K562细胞和原代红系祖细胞中的强制表达诱导内源性胎儿珠蛋白基因表达,提示对血红蛋白病进行治疗性干预的可能策略。

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