Unrestrained poly-ADP-ribosylation provides insights into chromatin regulation and human disease

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2021
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Prokhorova, Evgeniia
Agnew, Thomas
Wondisford, Anne R.
Tellier, Michael
Kaminski, Nicole
Beijer, Danique
Ahel, Ivan
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Molecular Cell. Cell Press. 2021, 81(12), pp. 2640-2655.e8. ISSN 1097-2765. eISSN 1097-4164. Available under: doi: 10.1016/j.molcel.2021.04.028
Zusammenfassung

ARH3/ADPRHL2 and PARG are the primary enzymes reversing ADP-ribosylation in vertebrates, yet their functions in vivo remain unclear. ARH3 is the only hydrolase able to remove serine-linked mono(ADP-ribose) (MAR) but is much less efficient than PARG against poly(ADP-ribose) (PAR) chains in vitro. Here, by using ARH3-deficient cells, we demonstrate that endogenous MARylation persists on chromatin throughout the cell cycle, including mitosis, and is surprisingly well tolerated. Conversely, persistent PARylation is highly toxic and has distinct physiological effects, in particular on active transcription histone marks such as H3K9ac and H3K27ac. Furthermore, we reveal a synthetic lethal interaction between ARH3 and PARG and identify loss of ARH3 as a mechanism of PARP inhibitor resistance, both of which can be exploited in cancer therapy. Finally, we extend our findings to neurodegeneration, suggesting that patients with inherited ARH3 deficiency suffer from stress-induced pathogenic increase in PARylation that can be mitigated by PARP inhibition.

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ISO 690PROKHOROVA, Evgeniia, Thomas AGNEW, Anne R. WONDISFORD, Michael TELLIER, Nicole KAMINSKI, Danique BEIJER, Julia M. REBER, Sarah C. KRASSNIG, Aswin MANGERICH, Ivan AHEL, 2021. Unrestrained poly-ADP-ribosylation provides insights into chromatin regulation and human disease. In: Molecular Cell. Cell Press. 2021, 81(12), pp. 2640-2655.e8. ISSN 1097-2765. eISSN 1097-4164. Available under: doi: 10.1016/j.molcel.2021.04.028
BibTex
@article{Prokhorova2021-06Unres-53740,
  year={2021},
  doi={10.1016/j.molcel.2021.04.028},
  title={Unrestrained poly-ADP-ribosylation provides insights into chromatin regulation and human disease},
  number={12},
  volume={81},
  issn={1097-2765},
  journal={Molecular Cell},
  pages={2640--2655.e8},
  author={Prokhorova, Evgeniia and Agnew, Thomas and Wondisford, Anne R. and Tellier, Michael and Kaminski, Nicole and Beijer, Danique and Reber, Julia M. and Krassnig, Sarah C. and Mangerich, Aswin and Ahel, Ivan}
}
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