首页> 外文期刊>Gene: An International Journal Focusing on Gene Cloning and Gene Structure and Function >Transcriptional activity of the novel identified human yy2 promoter is modified by DNA methylation.
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Transcriptional activity of the novel identified human yy2 promoter is modified by DNA methylation.

机译:新型鉴定的人yy2启动子的转录活性被DNA甲基化修饰。

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摘要

The recently identified transcription factor YY2 shares important features with the well characterized YY1 zinc finger protein. Both proteins mediate activating as well as repressing transcriptional properties and bind specifically to an identical DNA consensus motif, suggesting synergistic or competitive function of both factors in controlling target genes. In fact, the human yy2 gene has evolved from a retroposed copy of yy1, unusually inserted within an intron of another gene, the membrane-bound transcription factor protease site 2 (mbtps2). To elucidate the biological function of human yy2, we studied its regulation within the extraordinary genomic context. The intronic upstream region of yy2 indeed mediates significant promoter activity. In vitro, transcriptional activity of the CpG-rich yy2 promoter is clearly repressed by DNA methylation. In vivo, DNA demethylation experiments performed by treating human embryonic kidney (HEK293) cells with 5-Aza-2-deoxycytidine (Aza) revealed that endogenous yy2 expression is more than 3-fold enhanced whereas the mbtps2 level appears unaffected. In summary, our findings indicate that yy2 expression is mediated by its own methylation-sensitive promoter.
机译:最近鉴定的转录因子YY2与特征明确的YY1锌指蛋白具有重要的特征。两种蛋白都介导激活以及抑制转录特性,并特异性结合相同的DNA共有基序,表明这两种因子在控制靶基因中均具有协同或竞争作用。实际上,人yy2基因是从yy1的翻版副本演变而来的,该副本通常插入另一个基因的内含子中,该基因是膜结合转录因子蛋白酶位点2(mbtps2)。为了阐明人yy2的生物学功能,我们研究了其在异常基因组范围内的调控。 yy2的内含子上游区域确实介导了显着的启动子活性。在体外,富含CpG的yy2启动子的转录活性明显被DNA甲基化抑制。在体内,通过用5-Aza-2-deoxycytidine(Aza)处理人胚肾(HEK293)细胞进行的DNA去甲基化实验显示,内源性yy2表达增强了3倍以上,而mbtps2水平却未受影响。总之,我们的发现表明yy2表达是由其自身的甲基化敏感启动子介导的。

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