A highly conserved c‐fms gene intronic element controls macrophage‐specific and regulated expression

A highly conserved c‐fms gene intronic element controls macrophage‐specific and regulated expression
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高度保守的 c-fms 基因内含子元件控制巨噬细胞特异性和调节表达

DOI:
10.1189/jlb.70.5.812
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发表时间:
2001
影响因子:
5.5
通讯作者:
D. Hume
D. Hume
中科院分区:
医学3区
文献类型:
--
作者:
S. R. Himes;H. Tagoh;N. Goonetilleke;T. Sasmono;D. Oceandy;Richard Clark;C. Bonifer;D. Hume

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c-fms 基因编码巨噬细胞集落刺激因子-1 的受体。该基因在巨噬细胞谱系中选择性表达。先前的研究表明,内含子 2 中的序列控制组织特异性转录本的延伸并调节 c-fms 的表达。在小鼠内含子 2 内发现了四个巨噬细胞特异性脱氧核糖核酸酶 I (DNase I) 超敏位点 (DHS)。与人类基因中的序列相比,这些 DHS 的序列高度保守。我们将一个 250 bp 的区域称为 fms 内含子调控元件 (FIRE),它比 c-fms 近端启动子更加保守,包含许多巨噬细胞表达的转录因子的共有结合位点,包括 Sp1、PU.1 和 C/EBP。 FIRE被发现可作为巨噬细胞特异性增强子和瞬时转染中具有反义方向偏好的启动子。在巨噬细胞系 RAW264 的稳定转染中,以及在选择高水平和低水平 c-fms mRNA 表达的克隆中,与单独使用启动子获得的结果相比,内含子 2 的存在增加了报告基因的表达频率和水平。 FIRE 的去除消除了报告基因的表达,揭示了剩余内含子序列的抑制活性。因此,FIRE被证明是thefms基因中的关键调控元件。
The c‐fms gene encodes the receptor for macrophage colony‐stimulating factor‐1. This gene is expressed selectively in the macrophage cell lineage. Previous studies have implicated sequences in intron 2 that control transcript elongation in tissue‐specific and regulated expression of c‐fms. Four macrophage‐specific deoxyribonuclease I (DNase I)‐hypersensitive sites (DHSs) were identified within mouse intron 2. Sequences of these DHSs were found to be highly conserved compared with those in the human gene. A 250‐bp region we refer to as the fms intronic regulatory element (FIRE), which is even more highly conserved than the c‐fms proximal promoter, contains many consensus binding sites for macrophage‐expressed transcription factors including Sp1, PU.1, and C/EBP. FIRE was found to act as a macrophage‐specific enhancer and as a promoter with an antisense orientation preference in transient transfections. In stable transfections of the macrophage line RAW264, as well as in clones selected for high‐ and low‐level c‐fms mRNA expression, the presence of intron 2 increased the frequency and level of expression of reporter genes compared with those attained using the promoter alone. Removal of FIRE abolished reporter gene expression, revealing a suppressive activity in the remaining intronic sequences. Hence, FIRE is shown to be a key regulatory element in thefms gene.
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发表时间: 1999-12-01
影响因子: 3.1
作者:
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发表时间: 1992
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内含子沉默子调节 B 淋巴细胞和阶段特异性人类补体受体 2 型(CR2、CD21)基因的表达。
DOI: --
发表时间: 1998
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
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发表时间: 1992
期刊: Blood
影响因子: 20.3
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