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- W2957540177 abstract "Cancer cells need to acquire telomere maintenance mechanisms in order to counteract progressive telomere shortening due to multiple rounds of replication. Most human tumors maintain their telomeres expressing telomerase whereas the remaining 15%–20% utilize the alternative lengthening of telomeres (ALT) pathway. Previous studies have demonstrated that ionizing radiations (IR) are able to modulate telomere lengths and to transiently induce some of the ALT-pathway hallmarks in normal primary fibroblasts. In the present study, we investigated the telomere length modulation kinetics, telomeric DNA damage induction, and the principal hallmarks of ALT over a period of 13 days in X-ray-exposed primary cells. Our results show that X-ray-treated cells primarily display telomere shortening and telomeric damage caused by persistent IR-induced oxidative stress. After initial telomere erosion, we observed a telomere elongation that was associated to the transient activation of a homologous recombination (HR) based mechanism, sharing several features with the ALT pathway observed in cancer cells. Data indicate that telomeric damage activates telomeric HR-mediated repair in primary cells. The characterization of HR-mediated telomere repair in normal cells may contribute to the understanding of the ALT pathway and to the identification of novel strategies in the treatment of ALT-positive cancers." @default.
- W2957540177 created "2019-07-23" @default.
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- W2957540177 date "2019-07-12" @default.
- W2957540177 modified "2023-10-17" @default.
- W2957540177 title "X-rays Activate Telomeric Homologous Recombination Mediated Repair in Primary Cells" @default.
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- W2957540177 doi "https://doi.org/10.3390/cells8070708" @default.
- W2957540177 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6678842" @default.
- W2957540177 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31336873" @default.
- W2957540177 hasPublicationYear "2019" @default.
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