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FEBS Lett. 2001 Sep 14;505(2):229-32.

DNA polymerase beta imbalance increases apoptosis and mutagenesis induced by oxidative stress.

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IPBS-CNRS UMR 5089, groupe Instabilité Génétique et Cancer, 205 route de Narbonne, 31077 Toulouse Cedex, France.


Oxidative stress has been proposed to be one of the major causes leading to the accumulation of mutation that is associated with the initiation and progression of cancers. Elevated expression of DNA polymerase beta, an event found in many human tumors, has been shown to generate a mutator phenotype. Here, we demonstrated that overexpression of DNA polymerase beta strengthens the mutagenicity of oxidative damages, concomitantly with a higher cellular sensitivity and increased apoptosis. Deregulated expression of DNA polymerase beta could represent a predisposition factor for mutagenic effects of oxidative stress and thus have implication in the generation and/or evolution of cancer.

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