Transcriptional amplification in tumor cells with elevated c-Myc.

Transcriptional amplification in tumor cells with elevated c-Myc.
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DOI:
10.1016/j.cell.2012.08.026
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发表时间:
2012-09-28
期刊:
影响因子:
64.5
通讯作者:
Young RA
Young RA
中科院分区:
生物学1区
文献类型:
--
作者:
Lin CY;Lovén J;Rahl PB;Paranal RM;Burge CB;Bradner JE;Lee TI;Young RA

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c-Myc转录因子的高表达经常发生在人类癌症中,并且与肿瘤侵袭性和不良临床结果相关。高水平的c-Myc对整体基因调控的影响知之甚少,但被广泛认为涉及新激活或抑制的“Myc靶基因”。我们在这里报告,在肿瘤细胞表达高水平的c-Myc,转录因子积累在启动子区的活性基因,并导致转录扩增,产生增加水平的转录本内的细胞的基因表达程序。因此,c-Myc不是结合和调节一组新的基因,而是放大现有基因表达程序的输出。这些结果为致癌c-Myc对不同肿瘤细胞基因表达的不同影响提供了解释,并表明转录扩增降低了肿瘤细胞生长和增殖的限速限制。
Elevated expression of the c-Myc transcription factor occurs frequently in human cancers and is associated with tumor aggression and poor clinical outcome. The effect of high levels of c-Myc on global gene regulation is poorly understood, but is widely thought to involve newly activated or repressed “Myc target genes”. We report here that in tumor cells expressing high levels of c-Myc, the transcription factor accumulates in the promoter regions of active genes and causes transcriptional amplification, producing increased levels of transcripts within the cell's gene expression program. Thus, rather than binding and regulating a new set of genes, c-Myc amplifies the output of the existing gene expression program. These results provide an explanation for the diverse effects of oncogenic c-Myc on gene expression in different tumor cells and suggest that transcriptional amplification reduces rate-limiting constraints for tumor cell growth and proliferation.
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