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- Title
Partial complementation of a DNA ligase I deficiency by DNA ligase III and its impact on cell survival and telomere stability in mammalian cells.
- Authors
Le Chalony, Catherine; Hoffschir, Françoise; Gauthier, Laurent R.; Gross, Julia; Biard, Denis S.; Boussin, François D.; Pennaneach, Vincent
- Abstract
DNA ligase I (LigI) plays a central role in the joining of strand interruptions during replication and repair. In our current study, we provide evidence that DNA ligase III (LigIII) and XRCC1, which form a complex that functions in single-strand break repair, are required for the proliferation of mammalian LigI-depleted cells. We show from our data that in cells with either dysfunctional LigI activity or depleted of this enzyme, both LigIII and XRCC1 are retained on the chromatin and accumulate at replication foci. We also demonstrate that the LigI and LigIII proteins cooperate to inhibit sister chromatid exchanges but that only LigI prevents telomere sister fusions. Taken together, these results suggest that in cells with dysfunctional LigI, LigIII contributes to the ligation of replication intermediates but not to the prevention of telomeric instability.
- Publication
Cellular & Molecular Life Sciences, 2012, Vol 69, Issue 17, p2933
- ISSN
1420-682X
- Publication type
Article
- DOI
10.1007/s00018-012-0975-8