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Cell Mol Life Sci 2012 Sep 01;6917:2933-49. doi: 10.1007/s00018-012-0975-8.
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Partial complementation of a DNA ligase I deficiency by DNA ligase III and its impact on cell survival and telomere stability in mammalian cells.

Le Chalony C , Hoffschir F , Gauthier LR , Gross J , Biard DS , Boussin FD , Pennaneach V .

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.

PubMed ID: 22460582
PMC ID: PMC3417097
Article link: Cell Mol Life Sci

Species referenced: Xenopus
Genes referenced: h2bc21 lig1 parp1 pcna xrcc1

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References [+] :
Abbate, Bifunctional protein conferring enhanced green fluorescence and puromycin resistance. 2001, Pubmed