| First Author | Tanori M | Year | 2017 |
| Journal | Oncotarget | Volume | 8 |
| Issue | 60 | Pages | 100958-100974 |
| PubMed ID | 29254138 | Mgi Jnum | J:272340 |
| Mgi Id | MGI:6284473 | Doi | 10.18632/oncotarget.10479 |
| Citation | Tanori M, et al. (2017) Synthetic lethal genetic interactions between Rad54 and PARP-1 in mouse development and oncogenesis. Oncotarget 8(60):100958-100974 |
| abstractText | Mutations in DNA repair pathways are frequent in human cancers. Hence, gaining insights into the interaction of DNA repair genes is key to development of novel tumor-specific treatment strategies. In this study, we tested the functional relationship in development and oncogenesis between the homologous recombination (HR) factor Rad54 and Parp-1, a nuclear enzyme that plays a multifunctional role in DNA damage signaling and repair. We introduced single or combined Rad54 and Parp-1 inactivating germline mutations in Ptc1 heterozygous mice, a well-characterized model of medulloblastoma, the most common malignant pediatric brain tumor. Our study reveals that combined inactivation of Rad54 and Parp-1 causes a marked growth delay culminating in perinatallethality, providing for the first time evidence of synthetic lethal interactions between Rad54 and Parp-1 in vivo. Although the double mutation hampered investigation of Rad54 and Parp-1 interactions in cerebellum tumorigenesis, insights were gained by showing accumulation of endogenous DNA damage and increased apoptotic rate in granule cell precursors (GCPs). A network-based approach to detect differential expression of DNA repair genes in the cerebellum revealed perturbation of p53 signaling in Rad54(-/-)/Parp-1(-/-)/Ptc1(+/-), and MEFs from combined Rad54/Parp-1 mutants showed p53/p21-dependent typical senescent features. These findings help elucidate the genetic interplay between Rad54 and Parp-1 by suggesting that p53/p21-mediated apoptosis and/or senescence may be involved in synthetic lethal interactions occurring during development and inhibition of tumor growth. |
