The role of transcriptional activator GATA-1 at human beta-globin HS2.

The role of transcriptional activator GATA-1 at human beta-globin HS2.
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DOI:
10.1093/nar/gkn368
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发表时间:
2008-08
影响因子:
14.9
通讯作者:
Kim A
Kim A
中科院分区:
生物学2区
文献类型:
--
作者:
Cho Y;Song SH;Lee JJ;Choi N;Kim CG;Dean A;Kim A

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GATA-1 是一种红系激活剂,可结合 β-珠蛋白基因启动子和 β-珠蛋白基因座控制区 (LCR) 的 DNase I 超敏感位点 (HS)。我们通过突变红系细胞微型染色体内的结合位点,研究了 GATA-1 与 LCR HS2 增强子相互作用的直接作用。 HS2 中 GATA-1 的缺失不会影响 NF-E2(与 HS2 结合的第二种激活剂)的相互作用,HS2 的 DNase I 超敏性或连接的 ε-珠蛋白基因的启动子也不会改变。使用 RNAi 减少 NF-E2 证实了该激活剂在建立 LCR HS 中的总体重要性。然而,组蛋白乙酰转移酶 CBP 和 RNA pol II 向 HS2 的募集因 GATA-1 缺失而减少。 ε-珠蛋白的转录受到转录起始位点 RNA pol II 丢失以及编码序列中 H3 乙酰化和 H3K4 二甲基化和三甲基化减少的严重影响。相比之下,H3K4 单甲基化的广泛检测并未受到 HS2 中 GATA-1 缺失的影响。这些结果支持这样的观点,即 HS2 中的 GATA-1 相互作用在共激活子和 pol II 募集中具有显着而直接的作用,从而赋予靶基因主动组蛋白尾部修饰和转录激活作用,但其本身并不在建立 DNase I 超敏反应中发挥主要作用。
GATA-1 is an erythroid activator that binds β-globin gene promoters and DNase I hypersensitive sites (HSs) of the β-globin locus control region (LCR). We investigated the direct role of GATA-1 interaction at the LCR HS2 enhancer by mutating its binding sites within minichromosomes in erythroid cells. Loss of GATA-1 in HS2 did not compromise interaction of NF-E2, a second activator that binds to HS2, nor was DNase I hypersensitivity at HS2 or the promoter of a linked ε-globin gene altered. Reduction of NF-E2 using RNAi confirmed the overall importance of this activator in establishing LCR HSs. However, recruitment of the histone acetyltransferase CBP and RNA pol II to HS2 was diminished by GATA-1 loss. Transcription of ε-globin was severely compromised with loss of RNA pol II from the transcription start site and reduction of H3 acetylation and H3K4 di- and tri-methylation in coding sequences. In contrast, widespread detection of H3K4 mono-methylation was unaffected by loss of GATA-1 in HS2. These results support the idea that GATA-1 interaction in HS2 has a prominent and direct role in co-activator and pol II recruitment conferring active histone tail modifications and transcription activation to a target gene but that it does not, by itself, play a major role in establishing DNase I hypersensitivity.
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