Abstract
Histone modifications regulate key processes of eukaryotic genomes. Misregulation of the enzymes that place these modifications can lead to disease. An example of this is DOT1L, the enzyme that can mono-, di-, and trimethylate the nucleosome core on lysine 79 of histone H3 (H3K79). DOT1L plays a role in development and its misregulation has been implicated in several cancers, most notably leukemias caused by a rearrangement of the MLL gene. A DOT1L inhibitor is in clinical trials for these leukemias and shows promising results, yet we are only beginning to understand DOT1L’s function and regulation in the cell. Here, we review what happens upstream and downstream of H3K79 methylation. H3K79 methylation levels are highest in transcribed genes, where H2B ubiquitination can promote DOT1L activity. In addition, DOT1L can be targeted to transcribed regions of the genome by several of its interaction partners. Although methylation levels strongly correlate with transcription, the mechanistic link between the two is unclear and probably context-dependent. Methylation of H3K79 may act through recruiting or repelling effector proteins, but we do not yet know which effectors mediate DOT1L’s functions. Understanding DOT1L biology better will help us to understand the effects of DOT1L inhibitors and may allow the development of alternative strategies to target the DOT1L pathway.
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Acknowledgments
We thank Tessy Korthout for critical reading of the manuscript. This work was supported by the Netherlands Organisation for Scientific Research [NWO-VICI-016.130.627 to FVL] and the Dutch Cancer Society [KWF NKI2014-7232 and NKI2009-4511 to FVL].
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Vlaming, H., van Leeuwen, F. The upstreams and downstreams of H3K79 methylation by DOT1L. Chromosoma 125, 593–605 (2016). https://doi.org/10.1007/s00412-015-0570-5
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DOI: https://doi.org/10.1007/s00412-015-0570-5