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To restore full genomic integrity in a eukaryotic cell, DNA repair processes have to be coordinated with the resetting of nucleosomal organization. We have established a cell-free system using Drosophila embryo extracts to investigate the mechanism linking de novo nucleosome formation to nucleotide excision repair (NER). Closed-circular DNA containing a uniquely placed cisplatin-DNA adduct was used to follow chromatin assembly specifically from a site of NER. Nucleosome formation was initiated from a target site for NER. The assembly of nucleosomes propagated bidirectionally, creating a regular nucleosomal array extending beyond the initiation site. Furthermore, this chromatin assembly was still effective when the repair synthesis step in the NER process was inhibited.
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