Andrei Chabes - Associate Professor
dNTPs and maintenance of genome stability
The four dNTPs (dATP, dTTP, dCTP and dGTP) are the building blocks of DNA. A balanced supply and a correct overall concentration of dNTPs are key prerequisites for faithful genome duplication. Therefore, production of dNTPs is tightly regulated by multiple mechanisms. The concentration of dNTPs fluctuates during the cell cycle.
We are investigating (i) how the DNA damage checkpoint, a genome surveillance mechanism, regulates the concentration of dNTPs, and how dNTPs regulate the activation of the DNA damage checkpoint and (ii) how the imbalanced dNTP pools affect the fidelity of replication and how different replication errors are recognized and repaired.
Senior scientists/Post Docs:
Anna Karin Nilsson
Saitoh, S., Chabes, A., McDonald, W.H., Thelander, L., Yates, J.R., & Russell, P. (2002). Cid13 is a cytoplasmic poly(A) polymerase that regulates ribonucleotide reductase mRNA. Cell 109, 563-573.
Chabes, A., Georgieva, B., Domkin, V., Zhao X., Rothstein, R., & Thelander, L. (2003). Survival after DNA damage in budding yeast directly depends on increased dNTP levels allowed by relaxed feedback inhibition of ribonucleotide reductase. Cell 112, 391-401.
Chabes, A., & Stillman, B. (2007). Constitutively high dNTP concentration inhibits cell cycle progression and the DNA damage checkpoint in yeast Saccharomyces cerevisiae. Proc. Natl. Acad. Sci. U S A. 104, 1183-1188
Sabouri, N., Viberg, J., Goyal, D.K., Johansson, E., & Chabes, A. (Epub 2008 Sep 4). Evidence for lesion bypass by yeast replicative DNA polymerases during DNA damage. Nucleic Acids Res. 36, 5660-5667.
Nick McElhinny, S.A., Watts, B., Kumar, D., Watt, D., Lundström, E.B., Burgers, P.M.J., Johansson, E., Chabes, A., & Kunkel, T.A. (Epub 2010 Mar 1). Abundant ribonucleotide incorporation into DNA by yeast replicative polymerases. Proc Natl Acad Sci U S A. 107, 4949-4954.
Kumar, D., Viberg, J., Nilsson, A.K., & Chabes, A. (Epub 2010 Mar 9). Highly mutagenic and severely imbalanced dNTP pools can escape detection by the S-phase checkpoint. Nucleic Acids Res, 38, 3975-3983.
Nick McElhinny, S.A., Kumar, D., Clark, A.B., Watt, D.L., Watts, B.E., Lundström, E.B., Johansson, E., Chabes, A., & Kunkel, T.A. (Epub 2010 Aug 22) Genome instability due to ribonucleotide incorporation into DNA. Nature Chemical Biology; 6, 774-781.
Kumar, D., Abdulovic, A.L., Viberg, J., Nilsson, A.K., Kunkel, T.A., & Chabes, A. (E pub 2010 Oct 20) Mechanisms of mutagenesis in vivo due to imbalanced dNTP pools. Nucleic Acids Res. 39, 1360-1371.
Deem, A., Keszthelyi, A., Blackgrove, T., Vayl, A., Coffey, B., Mathur, R., Chabes, A., & Malkova, A. (2011 Epub 15 Feb) Break-induced replication is highly mutagenic. PLoS Biology. 9(2):e1000594.
Rossmann, M.P., Luo, W., Tsaponina, O., Chabes, A., & Stillman, B. (2011 Epub Apr 7) A common telomeric gene silencing assay is affected by nucleotide metabolism. Mol. Cell.
Johansson, E., Speck, C., & Chabes, A. (2011 Epub 27 Apr). A top-down view on DNA replication and recombination from 9,000 feet above sea level. Genome Biology, 12:304.
Tsaponina, O., Barsoum, E., Åström, S.U., & Chabes, A. (2011 Epub May 5) Ixr1 is required for the expression of the ribonucleotide reductase Rnr1 and maintenance of dNTP pools. PLoS Genetics. 7(5): e1002061.