首页> 外文期刊>Gene expression >Widespread, exceptionally high levels of histone H3 lysine 4 trimethylation largely mediate 'privileged' gene expression.
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Widespread, exceptionally high levels of histone H3 lysine 4 trimethylation largely mediate 'privileged' gene expression.

机译:广泛的,异常高的组蛋白H3赖氨酸4三甲基化水平很大程度上介导了“特权”基因的表达。

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摘要

We examined the molecular determinants for sustained high-level expression of "privileged" genes, defined as the 0.03% most highly expressed genes within any specific cell. We identified histone modifications by chromatin immunoprecipitation analyses on Keratin 8, the most highly expressed gene in the human breast cancer cell line, MCF-7, based on serial analysis of gene expression. Quantitative comparisons to the "normal" counterpart cell line, MCF-10A, expressing 350-fold lower levels of Keratin 8 and other breast cancer cell lines expressing higher levels were performed using real-time PCR. Extraordinarily high levels of trimethyl histone H3 lysine 4 (H3K4) were found primarily in the first intron of the Keratin 8 gene stretching from 400 to 2000 bp downstream from the promoter in all breast cancer cells lines but not in MCF-10A cells. The highest levels of histone H3K4 trimethylation in MCF-7 cells ranged from 70% to 80% over input within 1200 bp of this region. Knockdown of mixed-lineage leukemia (MLL), the specific methyltransferase for histone H3K4, with MLL-specific siRNA decreased histone H3K4 trimethylation on the Keratin 8 gene and decreased Keratin 8 mRNA levels. Histone H3K4 trimethylation mediates approximately 86% of the elevated, sustained expression of the Keratin 8 gene in MCF-7 cells.
机译:我们检查了“特权”基因持续高水平表达的分子决定因素,这些分子定义为任何特定细胞中0.03%最高表达的基因。我们通过对角蛋白8的染色质免疫沉淀分析确定了组蛋白修饰,角蛋白8是基于基因表达的系列分析,在人类乳腺癌细胞系MCF-7中表达最高的基因。使用实时PCR与表达水平较低的角蛋白8的“正常”对应细胞系MCF-10A和表达水平较高的其他乳腺癌细胞系进行定量比较。在所有乳腺癌细胞系中,主要在启动子下游延伸400至2000 bp的角蛋白8基因的第一个内含子中发现了非常高水平的三甲基组蛋白H3赖氨酸4(H3K4),但在MCF-10A细胞中却没有。 MCF-7细胞中组蛋白H3K4三甲基化的最高水平超出该区域1200 bp之内的输入范围的70%至80%。降低混合谱系白血病(MLL),组蛋白H3K4的特异性甲基转移酶和MLL特异性siRNA可以降低角蛋白8基因上的组蛋白H3K4三甲基化并降低角蛋白8 mRNA水平。组蛋白H3K4三甲基化介导MCF-7细胞中角蛋白8基因升高,持续表达的约86%。

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