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- W2045429308 abstract "UV-induced replication arrest in the xeroderma pigmentosum variant (XPV) but not in normal cells leads to an accumulation of the Mre11/Rad50/Nbs1 complex and phosphorylated histone H2AX (gamma-H2AX) in large nuclear foci at sites of stalled replication forks. These complexes have been shown to signal the presence of DNA damage, in particular, double-strand breaks (DSBs). This finding suggests that UV damage leads to the formation of DSBs during the course of replication arrest. After UV irradiation, XPV cells showed a fluence-dependent increase in the yield of gamma-H2AX foci that paralleled the production of Mre11 foci. The percentage of foci-positive cells increased rapidly (10-15%) up to fluences of 10 J.(-2) before saturating at higher fluences. Frequencies of gamma-H2AX and Mre11 foci both reached maxima at 4 h after UV irradiation. This pattern contrasts sharply to the situation observed after x-irradiation, where peak levels of gamma-H2AX foci were found to precede the formation of Mre11 foci by several hours. The nuclear distributions of gamma-H2AX and Mre11 were found to colocalize spatially after UV- but not x-irradiation. UV-irradiated XPV cells showed a one-to-one correspondence between Mre11 and gamma-H2AX foci-positive cells. These results show that XPV cells develop DNA DSBs during the course of UV-induced replication arrest. These UV-induced foci occur in cells that are unable to carry out efficient bypass replication of UV damage and may contribute to further genetic variation." @default.
- W2045429308 created "2016-06-24" @default.
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- W2045429308 date "2001-12-26" @default.
- W2045429308 modified "2023-10-01" @default.
- W2045429308 title "UV-induced replication arrest in the xeroderma pigmentosum variant leads to DNA double-strand breaks, γ-H2AX formation, and Mre11 relocalization" @default.
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- W2045429308 doi "https://doi.org/10.1073/pnas.231611798" @default.
- W2045429308 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/117544" @default.
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