Because cell cycle impacts on both DSB repair and chromatincondensation, it is frequently the source of technical artefacts asillustrated by the controversy with the elution technique in the1980s: the lysis solution used in the experimental protocol was dif-ferentially efficient according to the cell cycle distribution . Similarly, clonogenic cell survival or DSB repair ratemay be biased by different cell cycle distribution (Chavaudra et al.,2004). Independently of technical artefacts, it is more and moredocumented that cell cycle dependent chromatin decondensationwill influence DNA repair. The alternative NHEJ pathways togetherwith cohesin complexes, nucleases, helicases and histone deacety-lases appear to be the major actors of the specific response ofirradiated proliferating cells: their identification will contribute inthe development of new chemotherapy drugs (Moscariello & Iliakis,2013; Sjogren & Strom, 2010). This is notably the case of histonedeacetylase (HDAC) inhibitors. Since HDACs are highly expressed incancer cells, HDAC inhibitors, which promote chromatin expansionand transcription, appear as interesting agents to favor radiosen-sitization and limit cancer progression if applied in combinationwith radiotherapy .
Because cell cycle impacts on both DSB repair and chromatincondensation, it is frequently the source of technical artefacts asillustrated by the controversy with the elution technique in the1980s: the lysis solution used in the experimental protocol was dif-ferentially efficient according to the cell cycle distribution . Similarly, clonogenic cell survival or DSB repair ratemay be biased by different cell cycle distribution (Chavaudra et al.,2004). Independently of technical artefacts, it is more and moredocumented that cell cycle dependent chromatin decondensationwill influence DNA repair. The alternative NHEJ pathways togetherwith cohesin complexes, nucleases, helicases and histone deacety-lases appear to be the major actors of the specific response ofirradiated proliferating cells: their identification will contribute inthe development of new chemotherapy drugs (Moscariello & Iliakis,2013; Sjogren & Strom, 2010). This is notably the case of histonedeacetylase (HDAC) inhibitors. Since HDACs are highly expressed incancer cells, HDAC inhibitors, which promote chromatin expansionand transcription, appear as interesting agents to favor radiosen-sitization and limit cancer progression if applied in combinationwith radiotherapy .
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