Cells respond to genotoxic insults by triggering a DNA damage checkpoint surveillance mechanism and by activating repair pathways. Recent findings indicate that the two processes are more related than originally thought. Here we discuss the mechanisms involved in responding to UV-induced lesions in different phases of the cell cycle and summarize the most recent data in a model where Nucleotide Excision Repair (NER) and exonucleolytic activities act in sequence leading to checkpoint activation in non replicating cells. The critical trigger is likely represented by problematic intermediates that cannot be completely or efficiently repaired by NER. In S phase cells, on the other hand, the replicative polymerases, blocked by bulky UV lesions, re-initiate DNA synthesis downstream of the lesions, leaving behind a ssDNA tract. If these gaps are not rapidly refilled, checkpoint kinases will be activated.

Mind the gap : keeping UV lesions in check / D. Novarina, F. Amara, F. Lazzaro, P. Plevani, M. Muzi Falconi. - In: DNA REPAIR. - ISSN 1568-7864. - 10:7(2011), pp. 751-759.

Mind the gap : keeping UV lesions in check

D. Novarina
Primo
;
F. Amara
Secondo
;
F. Lazzaro;P. Plevani
Penultimo
;
M. Muzi Falconi
Ultimo
2011

Abstract

Cells respond to genotoxic insults by triggering a DNA damage checkpoint surveillance mechanism and by activating repair pathways. Recent findings indicate that the two processes are more related than originally thought. Here we discuss the mechanisms involved in responding to UV-induced lesions in different phases of the cell cycle and summarize the most recent data in a model where Nucleotide Excision Repair (NER) and exonucleolytic activities act in sequence leading to checkpoint activation in non replicating cells. The critical trigger is likely represented by problematic intermediates that cannot be completely or efficiently repaired by NER. In S phase cells, on the other hand, the replicative polymerases, blocked by bulky UV lesions, re-initiate DNA synthesis downstream of the lesions, leaving behind a ssDNA tract. If these gaps are not rapidly refilled, checkpoint kinases will be activated.
DNA damage checkpoint; DNA repair; UV irradiation
Settore BIO/18 - Genetica
Settore BIO/11 - Biologia Molecolare
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/161810
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