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- W2164670057 abstract "Overexpression of the MYC protooncogene has been implicated in the genesis of diverse human tumors. Tumorigenesis induced by MYC has been attributed to sustained effects on proliferation and differentiation. Here we report that MYC may also contribute to tumorigenesis by destabilizing the cellular genome. A transient excess of MYC activity increased tumorigenicity of Rat1A cells by at least 50-fold. The increase persisted for >30 days after the return of MYC activity to normal levels. The brief surfeit of MYC activity was accompanied by evidence of genomic instability, including karyotypic abnormalities, gene amplification, and hypersensitivity to DNA-damaging agents. MYC also induced genomic destabilization in normal human fibroblasts, although these cells did not become tumorigenic. Stimulation of Rat1A cells with MYC accelerated their passage through G 1 /S. Moreover, MYC could force normal human fibroblasts to transit G 1 and S after treatment with N- (phosphonoacetyl)- l -aspartate (PALA) at concentrations that normally lead to arrest in S phase by checkpoint mechanisms. Instead, the cells subsequently appeared to arrest in G 2 . We suggest that the accelerated passage through G 1 was mutagenic but that the effect of MYC permitted a checkpoint response only after G 2 had been reached. Thus, MYC may contribute to tumorigenesis through a dominant mutator effect." @default.
- W2164670057 created "2016-06-24" @default.
- W2164670057 creator A5010630509 @default.
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- W2164670057 date "1999-03-30" @default.
- W2164670057 modified "2023-09-26" @default.
- W2164670057 title "Transient excess of <i>MYC</i> activity can elicit genomic instability and tumorigenesis" @default.
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- W2164670057 doi "https://doi.org/10.1073/pnas.96.7.3940" @default.
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