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• W2989576725 abstract "Clastogen exposure can result in chromosomal rearrangements, including large deletions and inversions that are associated with cancer development. To examine such rearrangements in human cells, here we developed a reporter assay based on endogenous genes on chromosome 12. Using the RNA-guided nuclease Cas9, we induced two DNA double-strand breaks, one each in the GAPDH and CD4 genes, that caused a deletion rearrangement leading to CD4 expression from the GAPDH promoter. We observed that this GAPDH-CD4 deletion rearrangement activates CD4+ cells that can be readily detected by flow cytometry. Similarly, double-strand breaks in the LPCAT3 and CD4 genes induced an LPCAT3-CD4 inversion rearrangement resulting in CD4 expression. Studying the GAPDH-CD4 deletion rearrangement in multiple cell lines, we found that the canonical non-homologous end joining (C-NHEJ) factor XLF promotes these rearrangements. Junction analysis uncovered that the relative contribution of C-NHEJ appears lower in U2OS than in HEK293 and A549 cells. Furthermore, an ATM kinase inhibitor increased C-NHEJ-mediated rearrangements only in U2OS cells. We also found that an XLF residue that is critical for an interaction with the C-NHEJ factor X-ray repair cross-complementing 4 (XRCC4), and XRCC4 itself are each important for promoting both this deletion rearrangement and end joining without insertion/deletion mutations. In summary, a reporter assay based on endogenous genes on chromosome 12 reveals that XLF-dependent C-NHEJ promotes deletion rearrangements in human cells and that cell type-specific differences in the contribution of C-NHEJ and ATM kinase inhibition influence these rearrangements." @default.
• W2989576725 created "2019-12-05" @default.
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• W2989576725 date "2020-01-01" @default.
• W2989576725 modified "2023-09-26" @default.
• W2989576725 title "The canonical non-homologous end joining factor XLF promotes chromosomal deletion rearrangements in human cells" @default.
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• W2989576725 doi "https://doi.org/10.1074/jbc.ra119.010421" @default.
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