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Non-transcriptional control of DNA replication by c-Myc

机译:c-Myc对DNA复制的非转录控制

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The c-Myc proto-oncogene encodes a transcription factor that is essential for cell growth and proliferation and is broadly implicated in tumorigenesis. However, the biological functions required by c-Myc to induce oncogenesis remain elusive. Here we show that c-Myc has a direct role in the control of DNA replication. c-Myc interacts with the pre-replicative complex and localizes to early sites of DNA synthesis. Depletion of c-Myc from mammalian (human and mouse) cells as well as from Xenopus cell-free extracts, which are devoid of RNA transcription, demonstrates a non-transcriptional role for c-Myc in the initiation of DNA replication. Overexpression of c-Myc causes increased replication origin activity with subsequent DNA damage and checkpoint activation. These findings identify a critical function of c-Myc in DNA replication and suggest a novel mechanism for its normal and oncogenic functions.
机译:c-Myc原癌基因编码对于细胞生长和增殖必不可少的转录因子,广泛参与肿瘤发生。但是,c-Myc诱导肿瘤发生所需的生物学功能仍然难以捉摸。在这里,我们显示c-Myc在DNA复制的控制中具有直接作用。 c-Myc与复制前复合物相互作用,并位于DNA合成的早期位置。缺少RNA转录的哺乳动物(人类和小鼠)细胞以及非洲爪蟾无细胞提取物中的c-Myc耗竭证明了c-Myc在DNA复制起始中的非转录作用。 c-Myc的过度表达会导致复制起点的活性增加,并随后引起DNA损伤和检查点激活。这些发现确定了c-Myc在DNA复制中的关键功能,并提出了其正常和致癌功能的新机制。

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