Identification of a novel DNA oxidative damage repair pathway, requiring the ubiquitination of the histone variant macroH2A1.1

Autor: Khalid Ouararhni, Flore Mietton, Jamal S. M. Sabir, Abdulkhaleg Ibrahim, Annie Molla, Raed S. Albheyri, Ali T. Zari, Ahmed Bahieldin, Hervé Menoni, Christian Bronner, Stefan Dimitrov, Ali Hamiche
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: BMC Biology, Vol 22, Iss 1, Pp 1-14 (2024)
Druh dokumentu: article
ISSN: 1741-7007
DOI: 10.1186/s12915-024-01987-x
Popis: 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.
Databáze: Directory of Open Access Journals
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