A 5' beta-globin matrix-attachment region and the polyoma enhancer together confer position-independent transcription.

A 5' beta-globin matrix-attachment region and the polyoma enhancer together confer position-independent transcription.
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5 β-珠蛋白基质附着区和多瘤增强子一起赋予位置无关的转录。

DOI:
10.1016/0378-1119(94)90747-1
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发表时间:
1994
期刊:
影响因子:
3.5
通讯作者:
B. Villeponteau
B. Villeponteau
中科院分区:
生物学3区
文献类型:
--
作者:
Jinghua Yu;J. H. Bock;J. Slightom;B. Villeponteau

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由于整合位点的位置效应,将报告构建体插入高等真核生物的基因组中通常会导致多样化的基因表达。已发现20-kb人β-珠蛋白(β Glb)基因座控制区(LCR)在包含在表达载体中时可抑制这些位置效应。一些研究表明,β Glb-LCR的大部分活性存在于超敏位点II,该位点含有强增强子。在本研究中,我们重点研究了β Glb-LCR 5 ′端边界的基质附着区(MAR)。我们发现β Glb-MAR本身对稳定转化体中报告基因的转录几乎没有影响。然而,当β Glb-MAR与多瘤病毒增强子切割连接时,MAR增强子构建体赋予高水平的拷贝依赖性转录,其独立于染色体整合位点。这些结果表明,β Glb-MAR可能与特定的增强子元件协同工作,以抑制染色体位置效应并确保高水平表达。
Insertions of reporter constructs into the genome of higher eukaryotes typically lead to variegated gene expression due to position effects at the sites of integration. The 20-kb human β-globin (βGlb) locus control region (LCR) has been found to dampen these position effects when included in an expression vector. Several studies have indicated that much of the activity of the βGlb-LCRresides in hypersensitive site II, which contains a strong enhancer. In this study, we have focused on the matrix-attachment region (MAR) at the 5′ boundary of the βGlb-LCR. We find that the βGlb-MAR, by itself, has little effect on transcription of a reporter gene in stable transformants. However, when the βGlb-MARis linked inciswith the polyoma virus enhancer, theMAR-enhancer construct confers high levels of copy-dependent transcription that is independent of the chromosomal site of integration. These results suggest that the βGlb-MARmay work synergistically with particular enhancer elements to dampen chromosomal position effects and ensure high-level expression.
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
Slightom,JL;Theisen,TW;Koop,BF;Goodman,M
通讯作者: Goodman,M
DOI: 10.1126/science.1553545
发表时间: 1992-01-10
期刊: SCIENCE
影响因子: 56.9
作者:
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DOI: 10.1016/0167-4781(92)90437-5
发表时间: 1992
期刊: Biochimica et biophysica acta
影响因子: --
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DOI: 10.1073/pnas.86.14.5439
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