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CIS-acting element in the human LDL receptor promoter and uses thereof
CIS-acting element in the human LDL receptor promoter and uses thereof
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机译:人LDL受体启动子中的CIS作用元件及其用途
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摘要
The present invention provides a novel cis-acting regulatory element that is required for maximal induction of the human low density lipoprotein (LDL) receptor gene following depletion of cellular sterols in HepG2 cells. In vivo dimethyl sulfate footprinting of the human LDL receptor promoter before and after transcriptional induction in HepG2 cells revealed protection of the sequence 5'-GAGCTTCACGGGTTAAAAAG-3' (SEQ ID NO.1), corresponding to nucleotides -126 to -145, (referred to as FP1). Further, presence of the FP1 sequence resulted in significant enhancement of luciferase reporter gene expression (approximately 375%) in response to low levels of sterols in HepG2 cells using promoter luciferase constructs. In addition, the enhancement was markedly attenuated on nucleotide substitutions within the FP1 site. Thus, the present invention discloses a novel regulatory element, FP1, in the human LDL receptor promoter and a vector containing this element. It is contemplated that FP1 can be used to confer sterol regulatory capability to heterologous genes ordinarily not under sterol regulation and be used in an assay to screen for compounds capable of stimulating cells to synthesize LDL receptors.
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机译:本发明提供了新颖的顺式作用调节元件,其是在HepG2细胞中的细胞固醇耗尽后最大程度诱导人低密度脂蛋白(LDL)受体基因所必需的。人LDL受体启动子在HepG2细胞中转录诱导之前和之后的体内硫酸二甲酯的足迹显示对序列5'-GAGCTTCACGGGTTAAAAAG-3'(SEQ ID NO.1)的保护,对应于核苷酸-126至-145,(指作为FP1)。此外,FP1序列的存在导致使用启动子荧光素酶构建体响应于HepG2细胞中低水平的固醇的荧光素酶报告基因基因表达的显着增强(约375%)。另外,在FP1位点内的核苷酸取代上,增强显着减弱。因此,本发明公开了人LDL受体启动子中的新型调控元件FP1和含有该元件的载体。预期FP1可用于赋予通常不在固醇调节下的异源基因固醇调节能力,并且可用于筛选能够刺激细胞合成LDL受体的化合物的测定中。
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