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ZFX transactivation of the HIV-1 LTR is cell specific and depends on core enhancer and TATA box sequences.

机译:HIV-1 LTR的ZFX反式激活是细胞特异性的,并取决于核心增强子和TATA盒序列。

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摘要

The ZFX gene is ubiquitously transcribed and highly conserved among vertebrates. The integrity of Zfx, its murine homologue, has been shown to be important for growth during embryogenesis and sustained gamete production. Alternative splicing was shown to result in production of mRNAs coding for either ZFX804or a shorter isoform initiated downstream, ZFX575. ZFX575was previously shown to be a potent transactivator of the HLA-A11 promoter. Here, the HIV-1 LTR is also shown to be potently transactivated by ZFX575in several cell types, while ZFX804activity is found to be similar to that of ZFX575, null or intermediary according to the cell type. In all cell types, the HIV-1 TATA box sequence is a key element of transactivation, while the Sp1 or NFkappaB sites are variably required, according to the cell type. Overall, the results suggest that ZFX575and ZFX804could play a role in HIV-1 LTR induction as co-activators enhancing productive interactions between upstream transactivators and the basal transcription complexes recruited by the TATA box.
机译:ZFX基因在脊椎动物中无处不在且高度保守。 Zfx的鼠源同源物的完整性对胚胎发生和持续配子产生期间的生长非常重要。已显示出选择性剪接可导致产生编码ZFX804或下游启动的较短异构体ZFX575的mRNA。 ZFX575先前被证明是HLA-A11启动子的有效反式激活剂。在这里,HIV-1 LTR还显示在几种细胞类型中被ZFX575有效地激活,而ZFX804活性与ZFX575相似,根据细胞类型为零或中间。在所有细胞类型中,HIV-1 TATA盒序列是反式激活的关键因素,而根据细胞类型,可变地需要Sp1或NFkappB位点。总体而言,结果表明ZFX575和ZFX804可以在HIV-1 LTR诱导中发挥作用,因为它们是增强TATA盒招募的上游反式激活因子与基础转录复合物之间相互作用的辅助激活因子。

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  • 作者

    Gazin, C;

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  • 年度 1999
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  • 原文格式 PDF
  • 正文语种 en
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