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• W2087150377 abstract "DNA can adopt many structures that differ from the canonical B-form, and several of these non-canonical DNA structures have been implicated in genetic instability associated with human disease. Earlier, we found that Z-DNA causes DNA double-strand breaks (DSBs) in mammalian cells that can result in large-scale deletions and rearrangements. In contrast, the same Z-DNA-forming CG repeat in Escherichia coli resulted in only small contractions or expansions within the repeat. This difference in the Z-DNA-induced mutation spectrum between mammals and bacteria might be due to different mechanisms for DSB repair; in mammalian cells, non-homologous end-joining (NHEJ) is a major DSB repair pathway, while E. coli do not contain this system and typically use homologous recombination (HR) to process DSBs. To test the extent to which the different DSB repair pathways influenced the Z-DNA-induced mutagenesis, we engineered bacterial E. coli strains to express an inducible NHEJ system, to mimic the situation in mammalian cells. Mycobacterium tuberculosis NHEJ proteins Ku and ligase D (LigD) were expressed in E. coli cells in the presence or absence of HR, and the Z-DNA-induced mutations were characterized. We found that the presence of the NHEJ mechanism markedly shifted the mutation spectrum from small deletions/insertions to large-scale deletions (from 2% to 24%). Our results demonstrate that NHEJ plays a role in the generation of Z-DNA-induced large-scale deletions, suggesting that this pathway is associated with DNA structure-induced destabilization of genomes from prokaryotes to eukaryotes." @default.
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• W2087150377 date "2010-05-01" @default.
• W2087150377 modified "2023-10-15" @default.
• W2087150377 title "Pathways for Double-strand Break Repair in Genetically Unstable Z-DNA-forming Sequences" @default.
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• W2087150377 doi "https://doi.org/10.1016/j.jmb.2010.03.035" @default.
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