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c-Myc-regulated microRNAs modulate E2F1 expression

机译:c-Myc调控的microRNA调节E2F1表达

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MicroRNAs ( miRNAs) are 21 - 23 nucleotide RNA molecules that regulate the stability or translational efficiency of target messenger RNAs1. miRNAs have diverse functions, including the regulation of cellular differentiation, proliferation and apoptosis(2). Although strict tissue- and developmental-stage-specific expression is critical for appropriate miRNA function, mammalian transcription factors that regulate miRNAs have not yet been identified. The proto-oncogene c-MYC encodes a transcription factor that regulates cell proliferation, growth and apoptosis(3). Dysregulated expression or function of c-Myc is one of the most common abnormalities in human malignancy(4). Here we show that c-Myc activates expression of a cluster of six miRNAs on human chromosome 13. Chromatin immunoprecipation experiments show that c-Myc binds directly to this locus. The transcription factor E2F1 is an additional target of c-Myc that promotes cell cycle progression(5-7). We find that expression of E2F1 is negatively regulated by two miRNAs in this cluster, miR-17-5p and miR-20a. These findings expand the known classes of transcripts within the c-Myc target gene network, and reveal a mechanism through which c-Myc simultaneously activates E2F1 transcription and limits its translation, allowing a tightly controlled proliferative signal.
机译:MicroRNA(miRNA)是21-23个核苷酸的RNA分子,可调节目标信使RNA 1的稳定性或翻译效率。 miRNA具有多种功能,包括调节细胞分化,增殖和凋亡(2)。尽管严格的组织和发育阶段特异性表达对于适当的miRNA功能至关重要,但尚未发现调节miRNA的哺乳动物转录因子。原癌基因c-MYC编码调节细胞增殖,生长和凋亡的转录因子(3)。 c-Myc的表达或功能失调是人类恶性肿瘤中最常见的异常之一(4)。在这里,我们显示c-Myc激活了人类染色体13上六个miRNA簇的表达。染色质免疫沉淀实验表明c-Myc直接与该基因座结合。转录因子E2F1是c-Myc的另一个靶标,可促进细胞周期进程(5-7)。我们发现E2F1的表达受此簇中的两个miRNA,miR-17-5p和miR-20a负调控。这些发现扩展了c-Myc靶基因网络中已知的转录本类别,并揭示了一种机制,c-Myc同时激活E2F1转录并限制其翻译,从而严格控制增殖信号。

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