Abstract
Most human somatic cells do not express telomerase. Consequently, with each cell division their telomeres progressively shorten until replicative senescence is induced. Around 15% of human cancers maintain their telomeres using telomerase-independent, recombination-based mechanisms that are collectively termed 'alternative lengthening of telomeres' (ALT). In the yeast Saccharomyces cerevisiae, ALT cells are referred to as 'survivors'. One type of survivor (type II) resembles human ALT cells in that both are defined by the amplification of telomeric repeats. We analyzed recombination-mediated telomere extension events at individual telomeres in telomerase-negative yeast during the formation of type II survivors and found that long telomeres were preferentially extended. Furthermore, senescent cells with long telomeres were more efficient at bypassing senescence by the type II pathway. We speculate that telomere length may be important in determining whether cancer cells use telomerase or ALT to bypass replicative senescence.
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Acknowledgements
We thank K. Bernstein, B. Luke and P. Thorpe for comments on the manuscript. M.C. was supported by a Long-term Fellowship Award from the International Human Frontier Science Program (HFSP) organization and a Terry Fox Foundation Fellowship Award. This work was supported by funds from the US National Institutes of Health (CA009503 and GM008798 to J.C.D.; GM50237 to R.R.).
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M.C. designed and carried out the experiments, analyzed the data and wrote the manuscript. J.C.D. did the statistical analysis of the STEX data. R.R. helped to analyze the data and write the manuscript.
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Chang, M., Dittmar, J. & Rothstein, R. Long telomeres are preferentially extended during recombination-mediated telomere maintenance. Nat Struct Mol Biol 18, 451–456 (2011). https://doi.org/10.1038/nsmb.2034
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DOI: https://doi.org/10.1038/nsmb.2034
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