DNA double-strand breaks (DSBs) are repaired by non-homologous end joining (NHEJ) or homologous recombination (HR). HR requires 5' DSB end degradation that occurs in the presence of cyclin-dependent kinase (CDK) activity. Here, we show that a lack of any of the NHEJ proteins Yku (Yku70-Yku80), Lif1 or DNA ligase IV (Dnl4) increases 5' DSB end degradation in G1 phase, with ykuDelta cells showing the strongest effect. This increase depends on MRX, the recruitment of which at DSBs is enhanced in ykuDelta G1 cells. DSB processing in G2 is not influenced by the absence of Yku, but it is delayed by Yku overproduction, which also decreases MRX loading on DSBs. Moreover, DSB resection in ykuDelta cells occurs independently of CDK activity, suggesting that it might be promoted by CDK-dependent inhibition of Yku.

Clerici, M., Mantiero, D., Guerini, I., Lucchini, G., Longhese, M. (2008). The Yku70-Yku80 complex contributes to regulate double-strand break processing and checkpoint activation during the cell cycle. EMBO REPORTS, 9(8), 810-818 [10.1038/embor.2008.121].

The Yku70-Yku80 complex contributes to regulate double-strand break processing and checkpoint activation during the cell cycle

CLERICI, MICHELA;LUCCHINI, GIOVANNA;LONGHESE, MARIA PIA
2008

Abstract

DNA double-strand breaks (DSBs) are repaired by non-homologous end joining (NHEJ) or homologous recombination (HR). HR requires 5' DSB end degradation that occurs in the presence of cyclin-dependent kinase (CDK) activity. Here, we show that a lack of any of the NHEJ proteins Yku (Yku70-Yku80), Lif1 or DNA ligase IV (Dnl4) increases 5' DSB end degradation in G1 phase, with ykuDelta cells showing the strongest effect. This increase depends on MRX, the recruitment of which at DSBs is enhanced in ykuDelta G1 cells. DSB processing in G2 is not influenced by the absence of Yku, but it is delayed by Yku overproduction, which also decreases MRX loading on DSBs. Moreover, DSB resection in ykuDelta cells occurs independently of CDK activity, suggesting that it might be promoted by CDK-dependent inhibition of Yku.
Articolo in rivista - Articolo scientifico
Yku; MRX; double-strand break; checkpoint; Saccharomyces cerevisiae
English
810
818
Clerici, M., Mantiero, D., Guerini, I., Lucchini, G., Longhese, M. (2008). The Yku70-Yku80 complex contributes to regulate double-strand break processing and checkpoint activation during the cell cycle. EMBO REPORTS, 9(8), 810-818 [10.1038/embor.2008.121].
Clerici, M; Mantiero, D; Guerini, I; Lucchini, G; Longhese, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/5297
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