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Covalent modifications of histones in chromatin play an important role in regulation of eukaryotic gene expression and DNA repair. Formation of double-strand breaks (DSBs) in DNA is followed by the rapid local phosphorylation of the C-terminal serine in the replacement histone H2AX in megabase chromatin domains around DSBs and formation of discrete nuclear foci called γH2AX foci. This epigenetic modification...
Interstitial tandem (TTAGGG)n repeats (ITRs) in Chinese hamster (CH) cells are mostly arranged into the long (>100kb) continuous pericentric arrays which do not contain HindIII sites (Faravelli M, Azzalin CM, Bertoni L, Chernova O, Attolini C, Mondello C, et al. Molecular organization of internal telomeric sequences in Chinese hamster chromosomes, Gene 2002;283,11–16), are free of protein-coding...
DNA repair is an important factor of stability of pro- and eukaryotic genomes which plays a central role in mutagenesis and carcinogenesis. Genetic control of nucleotide excision repair (NER) in mammalian cells is well studied, but little is known about molecular mechanisms of postreplication repair (PRR) which allows bypass of base lesions in template strands after DNA replication. In Saccharomyces...
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