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Specific regulation of mRNA cap methylation by the c-Myc and E2F1 transcription factors

机译:c-Myc和E2F1转录因子对mRNA帽甲基化的特异性调控

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Methylation of the mRNA 5′ guanosine cap is essential for efficient gene expression. The 5′ methyl cap binds to eIF4E, which is the first step in the recruitment of mRNA to the 40S ribosomal subunit. To investigate whether mRNA cap methylation is regulated in a gene-specific manner, we established a method to detect the relative level of cap methylation on specific mRNAs. We found that two transcription factors, c-Myc and E2F1, induce cap methylation of their transcriptional target genes, and therefore, c-Myc and E2F1 upregulate gene expression by simultaneously inducing transcription and promoting translation. c-Myc-induced cap methylation is greater than transcriptional induction for the majority of its target genes, indicating that this is a major mechanism by which Myc regulates gene expression.
机译:mRNA 5'鸟苷帽的甲基化对于有效的基因表达至关重要。 5'甲基帽与eIF4E结合,这是将mRNA募集到40S核糖体亚基的第一步。为了研究是否以基因特异性方式调节mRNA帽甲基化,我们建立了一种检测特定mRNA上帽甲基化相对水平的方法。我们发现两个转录因子c-Myc和E2F1诱导其转录靶基因的帽甲基化,因此c-Myc和E2F1通过同时诱导转录和促进翻译来上调基因表达。对于大多数目标基因而言,c-Myc诱导的帽甲基化作用大于转录诱导作用,表明这是Myc调节基因表达的主要机制。

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