H2AX promotes replication fork degradation and chemosensitivity in BRCA-deficient tumours.
Humans
BRCA1 Protein
/ metabolism
Histones
/ metabolism
Poly(ADP-ribose) Polymerase Inhibitors
/ pharmacology
DNA Replication
/ drug effects
BRCA2 Protein
/ metabolism
Cell Line, Tumor
Female
Drug Resistance, Neoplasm
/ genetics
Animals
Ataxia Telangiectasia Mutated Proteins
/ metabolism
DNA Breaks, Double-Stranded
Breast Neoplasms
/ genetics
Mice
Tumor Suppressor p53-Binding Protein 1
/ metabolism
DNA Repair
Carrier Proteins
/ metabolism
DNA Damage
Rad51 Recombinase
/ metabolism
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
24 May 2024
24 May 2024
Historique:
received:
20
03
2024
accepted:
10
05
2024
medline:
25
5
2024
pubmed:
25
5
2024
entrez:
24
5
2024
Statut:
epublish
Résumé
Histone H2AX plays a key role in DNA damage signalling in the surrounding regions of DNA double-strand breaks (DSBs). In response to DNA damage, H2AX becomes phosphorylated on serine residue 139 (known as γH2AX), resulting in the recruitment of the DNA repair effectors 53BP1 and BRCA1. Here, by studying resistance to poly(ADP-ribose) polymerase (PARP) inhibitors in BRCA1/2-deficient mammary tumours, we identify a function for γH2AX in orchestrating drug-induced replication fork degradation. Mechanistically, γH2AX-driven replication fork degradation is elicited by suppressing CtIP-mediated fork protection. As a result, H2AX loss restores replication fork stability and increases chemoresistance in BRCA1/2-deficient tumour cells without restoring homology-directed DNA repair, as highlighted by the lack of DNA damage-induced RAD51 foci. Furthermore, in the attempt to discover acquired genetic vulnerabilities, we find that ATM but not ATR inhibition overcomes PARP inhibitor (PARPi) resistance in H2AX-deficient tumours by interfering with CtIP-mediated fork protection. In summary, our results demonstrate a role for H2AX in replication fork biology in BRCA-deficient tumours and establish a function of H2AX separable from its classical role in DNA damage signalling and DSB repair.
Identifiants
pubmed: 38789420
doi: 10.1038/s41467-024-48715-1
pii: 10.1038/s41467-024-48715-1
doi:
Substances chimiques
BRCA1 Protein
0
Histones
0
Poly(ADP-ribose) Polymerase Inhibitors
0
BRCA2 Protein
0
H2AX protein, human
0
BRCA1 protein, human
0
BRCA2 protein, human
0
Ataxia Telangiectasia Mutated Proteins
EC 2.7.11.1
Tumor Suppressor p53-Binding Protein 1
0
Carrier Proteins
0
ATR protein, human
EC 2.7.11.1
TP53BP1 protein, human
0
Rad51 Recombinase
EC 2.7.7.-
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
4430Subventions
Organisme : EC | EU Framework Programme for Research and Innovation H2020 | H2020 Priority Excellent Science | H2020 European Research Council (H2020 Excellent Science - European Research Council)
ID : 883877
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 31BL30_189698
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 310030_208143
Organisme : Krebsliga Schweiz (Ligue Suisse Contre le Cancer)
ID : KFS_5519-02-2022
Organisme : Wilhelm Sander-Stiftung (Wilhelm Sander Foundation)
ID : 2019.069.1
Informations de copyright
© 2024. The Author(s).
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