The packaging and compaction of DNA into chromatin is important for all DNA-metabolism processes such as transcription, replication and repair. The involvement of chromatin modifications in transcriptional regulation is relatively well characterized, and the distinct patterns of chromatin transitions that guide the process are thought to be the result of a code on the histone proteins (histone code). In contrast to transcription, the intricate link between chromatin and responses to DNA damage has been given attention only recently. It is now emerging that specific ATP-dependent chromatin remodeling complexes (including the Ino80, Swi/Snf and RSC remodelers) and certain constitutive (methylation of lysine 79 of histone H3) and DNA damage-induced covalent histone modifications (the most well characterized being the rapid phosphorylation of histone H2A) facilitate responses to double-strand breaks. Indeed, evidence is already accumulating for a DNA repair-specific histone code. In this review, the recent advances in our understanding of the relationship between chromatin modifications and double-strand break signaling and repair is discussed.
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We acknowledge the support of the Australian Institute of Nuclear Science and Engineering. TCK was the recipient of AINSE awards. Molecular Radiation Biology and Epigenetics in Human Health and Disease Laboratories are supported by the National Health and Medical Research Council of Australia (350359 and 268905).
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Karagiannis, T., El-Osta, A. Chromatin modifications and DNA double-strand breaks: the current state of play. Leukemia 21, 195–200 (2007). https://doi.org/10.1038/sj.leu.2404478
- double-strand break
- chromatin modification
- histone acetylation
- histone phosphorylation
- histone methylation
- chromatin-remodeling complex
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