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- Title
Homologous-recombination-deficient tumours are dependent on Polθ-mediated repair.
- Authors
Ceccaldi, Raphael; Liu, Jessica C.; Amunugama, Ravindra; Hajdu, Ildiko; Primack, Benjamin; Petalcorin, Mark I. R.; O'Connor, Kevin W.; Konstantinopoulos, Panagiotis A.; Elledge, Stephen J.; Boulton, Simon J.; Yusufzai, Timur; D'Andrea, Alan D.
- Abstract
Large-scale genomic studies have shown that half of epithelial ovarian cancers (EOCs) have alterations in genes regulating homologous recombination (HR) repair. Loss of HR accounts for the genomic instability of EOCs and for their cellular hyper-dependence on alternative poly-ADP ribose polymerase (PARP)-mediated DNA repair mechanisms. Previous studies have implicated the DNA polymerase θ (Polθ also known as POLQ, encoded by POLQ) in a pathway required for the repair of DNA double-strand breaks, referred to as the error-prone microhomology-mediated end-joining (MMEJ) pathway. Whether Polθ interacts with canonical DNA repair pathways to prevent genomic instability remains unknown. Here we report an inverse correlation between HR activity and Polθ expression in EOCs. Knockdown of Polθ in HR-proficient cells upregulates HR activity and RAD51 nucleofilament assembly, while knockdown of Polθ in HR-deficient EOCs enhances cell death. Consistent with these results, genetic inactivation of an HR gene (Fancd2) and Polq in mice results in embryonic lethality. Moreover, Polθ contains RAD51 binding motifs and it blocks RAD51-mediated recombination. Our results reveal a synthetic lethal relationship between the HR pathway and Polθ-mediated repair in EOCs, and identify Polθ as a novel druggable target for cancer therapy.
- Subjects
CANCER genetics; OVARIAN cancer; GENOMICS; DNA repair; DNA polymerases; TUMOR genetics
- Publication
Nature, 2015, Vol 518, Issue 7538, p258
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature14184