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dNTP pool levels modulate mutator phenotypes of error-prone DNA polymerase ε variants
Department of Pathology, University of Washington, Seattle, WA 98195, USA.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics. Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). (Andrei Chabes)
Department of Pathology, University of Washington, Seattle, WA 98195, USA.
Department of Pathology, University of Washington, Seattle, WA 98195, USA.
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2015 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 112, no 19, E2457-E2466 p.Article in journal (Refereed) Published
Abstract [en]

Mutator phenotypes create genetic diversity that fuels tumor evolution. DNA polymerase (Pol) ε mediates leading strand DNA replication. Proofreading defects in this enzyme drive a number of human malignancies. Here, using budding yeast, we show that mutator variants of Pol ε depend on damage uninducible (Dun)1, an S-phase checkpoint kinase that maintains dNTP levels during a normal cell cycle and up-regulates dNTP synthesis upon checkpoint activation. Deletion of DUN1 (dun1Δ) suppresses the mutator phenotype of pol2-4 (encoding Pol ε proofreading deficiency) and is synthetically lethal with pol2-M644G (encoding altered Pol ε base selectivity). Although pol2-4 cells cycle normally, pol2-M644G cells progress slowly through S-phase. The pol2-M644G cells tolerate deletions of mediator of the replication checkpoint (MRC) 1 (mrc1Δ) and radiation sensitive (Rad) 9 (rad9Δ), which encode mediators of checkpoint responses to replication stress and DNA damage, respectively. The pol2-M644G mutator phenotype is partially suppressed by mrc1Δ but not rad9Δ; neither deletion suppresses the pol2-4 mutator phenotype. Thus, checkpoint activation augments the Dun1 effect on replication fidelity but is not required for it. Deletions of genes encoding key Dun1 targets that negatively regulate dNTP synthesis, suppress the dun1Δ pol2-M644G synthetic lethality and restore the mutator phenotype of pol2-4 in dun1Δ cells. DUN1 pol2-M644G cells have constitutively high dNTP levels, consistent with checkpoint activation. In contrast, pol2-4 and POL2 cells have similar dNTP levels, which decline in the absence of Dun1 and rise in the absence of the negative regulators of dNTP synthesis. Thus, dNTP pool levels correlate with Pol ε mutator severity, suggesting that treatments targeting dNTP pools could modulate mutator phenotypes for therapy.

Place, publisher, year, edition, pages
2015. Vol. 112, no 19, E2457-E2466 p.
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Cell and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-101547DOI: 10.1073/pnas.1422948112ISI: 000354390600011PubMedID: 25827226OAI: oai:DiVA.org:umu-101547DiVA: diva2:800222
Available from: 2015-04-02 Created: 2015-04-02 Last updated: 2017-12-04Bibliographically approved

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Marjavaara, LisetteChabes, Andrei
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Department of Medical Biochemistry and BiophysicsMolecular Infection Medicine Sweden (MIMS)
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