Abstract
5-Hydroxymethylcytosine (hmC) is an oxidation product of 5-methylcytosine which is present in the deoxyribonucleic acid (DNA) of most mammalian cells. Reduction of hmC levels in DNA is a hallmark of cancers. Elucidating the dynamics of this oxidation reaction and the lifetime of hmC in DNA is fundamental to understanding hmC function. Using stable isotope labelling of cytosine derivatives in the DNA of mammalian cells and ultrasensitive tandem liquid–chromatography mass spectrometry, we show that the majority of hmC is a stable modification, as opposed to a transient intermediate. In contrast with DNA methylation, which occurs immediately during replication, hmC forms slowly during the first 30 hours following DNA synthesis. Isotopic labelling of DNA in mouse tissues confirmed the stability of hmC in vivo and demonstrated a relationship between global levels of hmC and cell proliferation. These insights have important implications for understanding the states of chemically modified DNA bases in health and disease.
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Acknowledgements
We acknowledge the CRUK CI Flow Cytometry and Histopathology/In Situ Hybridization core facilities for their contributions, D. Oxley, C. d'Santos and D. Michelle-Smith for their support with mass spectrometry, X. Zou for his help with mES cells and D. Tannahill for a critical reading of the manuscript. This work was funded by CRUK (all authors) and the Wellcome Trust Senior Investigator Award (S.B.).
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M.B., S.U-L., A.M. and S.B. conceived and designed the experiments; M.B. and S.U-L. performed the experiments; X.Y., M.W. and M.B. developed the mass spectrometry methods; M.B. and S.U-L. analysed the data with the help of X.Y. and M.W.; M.B., S.U-L. and S.B. co-wrote the manuscript with contributions from all authors.
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Bachman, M., Uribe-Lewis, S., Yang, X. et al. 5-Hydroxymethylcytosine is a predominantly stable DNA modification. Nature Chem 6, 1049–1055 (2014). https://doi.org/10.1038/nchem.2064
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DOI: https://doi.org/10.1038/nchem.2064
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