1. Identification of a novel DNA oxidative damage repair pathway, requiring the ubiquitination of the histone variant macroH2A1.1.
- Author
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Ouararhni, Khalid, Mietton, Flore, Sabir, Jamal S. M., Ibrahim, Abdulkhaleg, Molla, Annie, Albheyri, Raed S., Zari, Ali T., Bahieldin, Ahmed, Menoni, Hervé, Bronner, Christian, Dimitrov, Stefan, and Hamiche, Ali
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POLY(ADP-ribose) polymerase , *DNA damage , *ALKYLATING agents , *GENETIC transcription regulation , *CELL survival , *DNA repair , *CHROMATIN - Abstract
Background: The histone variant macroH2A (mH2A), the most deviant variant, is about threefold larger than the conventional histone H2A and consists of a histone H2A-like domain fused to a large Non-Histone Region responsible for recruiting PARP-1 to chromatin. The available data suggest that the histone variant mH2A participates in the regulation of transcription, maintenance of heterochromatin, NAD+ metabolism, and double-strand DNA repair. Results: Here, we describe a novel function of mH2A, namely its implication in DNA oxidative damage repair through PARP-1. The depletion of mH2A affected both repair and cell survival after the induction of oxidative lesions in DNA. PARP-1 formed a specific complex with mH2A nucleosomes in vivo. The mH2A nucleosome-associated PARP-1 is inactive. Upon oxidative damage, mH2A is ubiquitinated, PARP-1 is released from the mH2A nucleosomal complex, and is activated. The in vivo-induced ubiquitination of mH2A, in the absence of any oxidative damage, was sufficient for the release of PARP-1. However, no release of PARP-1 was observed upon treatment of the cells with either the DNA alkylating agent MMS or doxorubicin. Conclusions: Our data identify a novel pathway for the repair of DNA oxidative lesions, requiring the ubiquitination of mH2A for the release of PARP-1 from chromatin and its activation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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