Abstract
Enzymes catalysing the methylation of the 5-position of cytosine (mC) have essential roles in regulating gene expression and maintaining cellular identity. Recently, TET1 was found to hydroxylate the methyl group of mC, converting it to 5-hydroxymethyl cytosine (hmC). Here we show that TET1 binds throughout the genome of embryonic stem cells, with the majority of binding sites located at transcription start sites (TSSs) of CpG-rich promoters and within genes. The hmC modification is found in gene bodies and in contrast to mC is also enriched at CpG-rich TSSs. We provide evidence further that TET1 has a role in transcriptional repression. TET1 binds a significant proportion of Polycomb group target genes. Furthermore, TET1 associates and colocalizes with the SIN3A co-repressor complex. We propose that TET1 fine-tunes transcription, opposes aberrant DNA methylation at CpG-rich sequences and thereby contributes to the regulation of DNA methylation fidelity.
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Acknowledgements
We thank U. Toftegaard for excellent technical help, M. Okano for the donation of TKO ES cells, and members of the Helin lab for discussions. M.T.P. was supported by a fellowship from the Danish Cancer Society. J.R. is a senior research fellow of the Wellcome Trust. The work in the Helin lab was supported by grants from the Excellence Program of the University of Copenhagen, the Danish National Research Foundation, the Danish Cancer Society, the Lundbeck foundation, the Novo Nordisk Foundation, and the Danish Medical Research Council.
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K.W. performed the major part of experiments in Figs 1, 3, 4a, b, h and Supplementary Figs 1a–c, 2, 3, 5, 7a, 9a–d, 10a, 11 and 12c, d. J.C. developed and characterized the new reagents used in this study, and participated in most experiments. M.T.P. performed the major part of experiments in Figs 2, 4c, g and Supplementary Figs 1d, 6b, 7b, c, 8, 10b and 12a, b. J.V.J. performed bioinformatics analyses. P.A.C.C. assisted in characterizing reagents. J.R performed the mass spectrometry analysis. J.C. and K.H. supervised the project and all authors contributed to the writing of the manuscript.
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K.H., J.C. and P.A.C.C. are cofounders of EpiTherapeutics and have shares and warrants in the company. All other authors declare that they have no competing financial interests.
Supplementary information
Supplementary Information
This file contains Supplementary Figures 1-12 with legends and additional references. (PDF 615 kb)
Supplementary Table 1
This table shows ChIP-seq identified target genes for Tet1-N, Tet1-C, Sin3A (Abcam), Sin3A (S.Cruz). (XLS 541 kb)
Supplementary Table 2
This table shows hmC status of genes reported to become DNA methylated during differentiation. (XLS 82 kb)
Supplementary Table 3
This table shows Tet1 knockdown microarray data. (XLS 10245 kb)
Supplementary Table 4
This table shows Sin3A knockdown microarray data. (XLS 7690 kb)
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Williams, K., Christensen, J., Pedersen, M. et al. TET1 and hydroxymethylcytosine in transcription and DNA methylation fidelity. Nature 473, 343–348 (2011). https://doi.org/10.1038/nature10066
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DOI: https://doi.org/10.1038/nature10066
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Yuesheng Xia
Focus on TET1: natural or factitious regulation of DNA methylation in embryogenesis and cancer
We respect Kristine Williams et al for their research, which determine the understanding essence of DNA methylation in embryogenesis and cancer. DNA methylation contributes substantively to transcriptional regulations that underlie mammalian development and cellular differentiation, the methylated or unmethylated status of a CpG site is function as a cellular memory. Genome-wide quantitative assessment proclaims genome-wide variation of DNA methylation patterns, compared to normal tissue controls, some
tumors exhibit greater methylation entropies (Nucl Acids Res 39,1?10;2011), many cancer cells have decreased fidelity in replicating methylation patterns in some CpG islands, and that the decrease could lead to methylation of the entire CpG islands (Cancer Res 65, 11-117;2005). Natural regulation or factitious embellish of DNA methylation display active promoter (Nature 452,45-50;2008), however it lacks specific goal, Kristine Williams et al's study provide a new target for cancer treatment.
Jianhua Wang, Mei Shi, Yuesheng Xia
Xijing Hospital, Fourth Military Medical University, China
E-mail: [email protected] [email protected]
Jianhua Wang
TET1 implicates vital regulation on life: DNA methylation
We respect Kristine Williams et al for their research, which determine the natural process of DNA methylation in embryogenesis. DNA methylation contributes substantively to transcriptional regulations that underlie mammalian development and cellular differentiation, the methylated or unmethylated status of a CpG site is function as a cellular memory. Genome-wide quantitative assessment proclaims genome-wide variation of DNA methylation patterns, compared to normal tissue controls, some tumors exhibit greater methylation entropies to decrease fidelity in replicating methylation patterns in some CpG islands. Factitious regulation of DNA methylation display active promoter and is beneficial to cancer to change process. However, TET1 provide a new target for cancer treatment.
Jianhua Wang, Mei Shi
Xijing Hospital, Fourth Military Medical University, China
E-mail: [email protected]