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- W2121038127 abstract "DNA damage can occur due to environmental insults or intrinsic metabolic processes and is a major threat to genome stability. The DNA damage response is composed of a series of well coordinated cellular processes that include activation of the DNA damage checkpoint, transient cell cycle arrest, DNA damage repair, and reentry into the cell cycle. Here we demonstrate that mutant cells defective for TOR complex 2 (TORC2) or the downstream AGC-like kinase, Gad8, are highly sensitive to chronic replication stress but are insensitive to ionizing radiation. We show that in response to replication stress, TORC2 is dispensable for Chk1-mediated cell cycle arrest but is required for the return to cell cycle progression. Rad52 is a DNA repair and recombination protein that forms foci at DNA damage sites and stalled replication forks. TORC2 mutant cells show increased spontaneous nuclear Rad52 foci, particularly during S phase, suggesting that TORC2 protects cells from DNA damage that occurs during normal DNA replication. Consistently, the viability of TORC2-Gad8 mutant cells is dependent on the presence of the homologous recombination pathway and other proteins that are required for replication restart following fork replication stalling. Our findings indicate that TORC2 is required for genome integrity. This may be relevant for the growing amount of evidence implicating TORC2 in cancer development.Background: TOR complex 2 (TORC2) is a conserved protein complex that regulates multiple aspects of cell survival and proliferation.Results: DNA metabolism and DNA damage response are impaired upon disruption of TORC2.Conclusion: TORC2 affects replication-associated damages, independent of checkpoint activation.Significance: TORC2 is required to maintain genome stability in fission yeast, a function that may be evolutionarily conserved." @default.
- W2121038127 created "2016-06-24" @default.
- W2121038127 creator A5047871750 @default.
- W2121038127 date "2000-06-01" @default.
- W2121038127 modified "2023-10-01" @default.
- W2121038127 title "DNA damage and cell cycle control in Schizosaccharomyces pombe" @default.
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