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  • 1. Davidson, Marta B.
    et al.
    Katou, Yuki
    Keszthelyi, Andrea
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Sing, Tina L.
    Xia, Tian
    Ou, Jiongwen
    Vaisica, Jessica A.
    Thevakumaran, Neroshan
    Marjavaara, Lisette
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Myers, Chad L.
    Chabes, Andrei
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik. Umeå universitet, Medicinska fakulteten, Molekylär Infektionsmedicin, Sverige (MIMS).
    Shirahige, Katsuhiko
    Brown, Grant W.
    Endogenous DNA replication stress results in expansion of dNTP pools and a mutator phenotype2012Inngår i: EMBO Journal, ISSN 0261-4189, E-ISSN 1460-2075, Vol. 31, nr 4, s. 895-907Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The integrity of the genome depends on diverse pathways that regulate DNA metabolism. Defects in these pathways result in genome instability, a hallmark of cancer. Deletion of ELG1 in budding yeast, when combined with hypomorphic alleles of PCNA results in spontaneous DNA damage during S phase that elicits upregulation of ribonucleotide reductase (RNR) activity. Increased RNR activity leads to a dramatic expansion of deoxyribonucleotide (dNTP) pools in G1 that allows cells to synthesize significant fractions of the genome in the presence of hydroxyurea in the subsequent S phase. Consistent with the recognized correlation between dNTP levels and spontaneous mutation, compromising ELG1 and PCNA results in a significant increase in mutation rates. Deletion of distinct genome stability genes RAD54, RAD55, and TSA1 also results in increased dNTP levels and mutagenesis, suggesting that this is a general phenomenon. Together, our data point to a vicious circle in which mutations in gatekeeper genes give rise to genomic instability during S phase, inducing expansion of the dNTP pool, which in turn results in high levels of spontaneous mutagenesis. The EMBO Journal (2012) 31, 895-907. doi: 10.1038/emboj.2011.485; Published online 10 January 2012

  • 2. Kenigsberg, Ephraim
    et al.
    Yehuda, Yishai
    Marjavaara, Lisette
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Keszthelyi, Andrea
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Chabes, Andrei
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Tanay, Amos
    Simon, Itamar
    The mutation spectrum in genomic late replication domains shapes mammalian GC content2016Inngår i: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962, Vol. 44, nr 9, s. 4222-4232Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Genome sequence compositions and epigenetic organizations are correlated extensively across multiple length scales. Replication dynamics, in particular, is highly correlated with GC content. We combine genome-wide time of replication (ToR) data, topological domains maps and detailed functional epigenetic annotations to study the correlations between replication timing and GC content at multiple scales. We find that the decrease in genomic GC content at large scale late replicating regions can be explained by mutation bias favoring A/T nucleotide, without selection or biased gene conversion. Quantification of the free dNTP pool during the cell cycle is consistent with a mechanism involving replication-coupled mutation spectrum that favors AT nucleotides at late S-phase. We suggest that mammalian GC content composition is shaped by independent forces, globally modulating mutation bias and locally selecting on functional element. Deconvoluting these forces and analyzing them on their native scales is important for proper characterization of complex genomic correlations.

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  • 3. Poli, Jerome
    et al.
    Tsaponina, Olga
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Crabbe, Laure
    Keszthelyi, Andrea
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik.
    Pantesco, Veronique
    Chabes, Andrei
    Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik. Umeå universitet, Medicinska fakulteten, Molekylär Infektionsmedicin, Sverige (MIMS).
    Lengronne, Armelle
    Pasero, Philippe
    dNTP pools determine fork progression and origin usage under replication stress2012Inngår i: EMBO Journal, ISSN 0261-4189, E-ISSN 1460-2075, Vol. 31, nr 4, s. 883-894Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Intracellular deoxyribonucleoside triphosphate (dNTP) pools must be tightly regulated to preserve genome integrity. Indeed, alterations in dNTP pools are associated with increased mutagenesis, genomic instability and tumourigenesis. However, the mechanisms by which altered or imbalanced dNTP pools affect DNA synthesis remain poorly understood. Here, we show that changes in intracellular dNTP levels affect replication dynamics in budding yeast in different ways. Upregulation of the activity of ribonucleotide reductase (RNR) increases elongation, indicating that dNTP pools are limiting for normal DNA replication. In contrast, inhibition of RNR activity with hydroxyurea (HU) induces a sharp transition to a slow-replication mode within minutes after S-phase entry. Upregulation of RNR activity delays this transition and modulates both fork speed and origin usage under replication stress. Interestingly, we also observed that chromosomal instability (CIN) mutants have increased dNTP pools and show enhanced DNA synthesis in the presence of HU. Since upregulation of RNR promotes fork progression in the presence of DNA lesions, we propose that CIN mutants adapt to chronic replication stress by upregulating dNTP pools.

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