PMID: 8946027Nov 4, 1996Paper

The role of poly(ADP-ribosyl)ation in the adaptive response

Mutation Research
H E Kleczkowska, F R Althaus

Abstract

An involvement of the poly(ADP-ribosyl)ation system in the expression of the adaptive response has been demonstrated with inhibitors of the nuclear enzyme poly(ADP-ribose) polymerase. This enzyme is a key component of a reaction cycle in chromatin, involving dynamic synthesis and degradation of variably sized ADP-ribose polymers in response to DNA strand breaks. The present report reviews recent work focussing on the response of the poly(ADP-ribosyl)ation system in low dose adaptation. The results suggest that adaptation of human cells to minute concentrations of an alkylating agent involves a different activation mechanism for poly(ADP-ribose) polymerase than DNA break-mediated stimulation after high dose treatment. Moreover, adaptation induces the formation of branched polymers with a very high binding affinity for histone tails and selected other proteins. High dose challenge treatment of adapted cells further enhances formation of branched polymers. We propose that apart from sensing DNA nicks, poly(ADP-ribose) polymerase may be part of pathway protecting cells from downstream events of DNA damage.

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Citations

Nov 25, 2004·Progress in Biophysics and Molecular Biology·Paul A NguewaJosé M Pérez
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Jul 8, 2009·Radiation Research·Anna SanninoMaria Rosaria Scarfì

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