TRABID overexpression enables synthetic lethality to PARP inhibitor via prolonging 53BP1 retention at double-strand breaks

• Published in: Nature communications 2023-03, Vol.14 (1), p.1810-1810, Article 1810
• Main Authors: Ma, Jian, Zhou, Yingke, Pan, Penglin, Yu, Haixin, Wang, Zixi, Li, Lei Lily, Wang, Bing, Yan, Yuqian, Pan, Yunqian, Ye, Qi, Liu, Tianjie, Feng, Xiaoyu, Xu, Shan, Wang, Ke, Wang, Xinyang, Jian, Yanlin, Ma, Bohan, Fan, Yizeng, Gao, Yang, Huang, Haojie, Li, Lei
• Format: Article
• Language: English
• Subjects: 13/109; 13/51; 14/35; 38/1; 38/39; 49/15; 49/23; 49/47; 631/337/1427/2122; 631/67/1059/602; Adenosine diphosphate; Deoxyribonucleic acid; DNA; DNA - metabolism; DNA damage; DNA End-Joining Repair; DNA Repair; Double-strand break repair; Genomic instability; Homologous recombination; Homologous recombination repair; Homology; Humanities and Social Sciences; Humans; Inactivation; Inhibitors; Ionizing radiation; Lethality; Male; multidisciplinary; Non-homologous end joining; Nuclear Proteins - metabolism; Poly(ADP-ribose) polymerase; Poly(ADP-ribose) Polymerase Inhibitors - pharmacology; Poly(ADP-ribose) Polymerases - genetics; Poly(ADP-ribose) Polymerases - metabolism; Prostate cancer; Prostatic Neoplasms - drug therapy; Prostatic Neoplasms - genetics; Repressor Proteins - metabolism; Retention; Ribose; Science; Science (multidisciplinary); Synthetic Lethal Mutations; Targeted cancer therapy; Tumor Suppressor p53-Binding Protein 1 - genetics; Tumor Suppressor p53-Binding Protein 1 - metabolism; Ubiquitin; Ubiquitin-protein ligase; Ubiquitination
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-023-37499-5

53BP1 promotes nonhomologous end joining (NHEJ) over homologous recombination (HR) repair by mediating inactivation of DNA end resection. Ubiquitination plays an important role in regulating dissociation of 53BP1 from DNA double-strand breaks (DSBs). However, how this process is regulated remains poorly understood. Here, we demonstrate that TRABID deubiquitinase binds to 53BP1 at endogenous level and regulates 53BP1 retention at DSB sites. TRABID deubiquitinates K29-linked polyubiquitination of 53BP1 mediated by E3 ubiquitin ligase SPOP and prevents 53BP1 dissociation from DSBs, consequently inducing HR defects and chromosomal instability. Prostate cancer cells with TRABID overexpression exhibit a high sensitivity to poly (ADP-ribose) polymerase (PARP) inhibitors. Our work shows that TRABID facilitates NHEJ repair over HR during DNA repair by inducing prolonged 53BP1 retention at DSB sites, suggesting that TRABID overexpression may predict HR deficiency and the potential therapeutic use of PARP inhibitors in prostate cancer. The retention of 53BP1 at DNA double strand breaks (DSBs) is inhibitory to homologous recombination repair. Following ionising radiation, the authors demonstrate that TRABID-mediated deubiquitination of 53BP1 promotes its retention, sensitising prostate cancer to PARP inhibition.