| Autor: |
Duy D. Nguyen, William F. Hooper, Timothy R. Chu, Heather Geiger, Jennifer M. Shelton, Minita Shah, Zoe R. Goldstein, Lara Winterkorn, Michael Sigouros, Jyothi Manohar, Jenna Moyer, David Wilkes, Rahul R. Singh, Weisi Liu, Andrea Sboner, Scott T. Tagawa, David M. Nanus, Jones T. Nauseef, Cora N. Sternberg, Ana M. Molina, Douglas Scherr, Giorgio Inghirami, Juan Miguel Mosquera, Olivier Elemento, Nicolas Robine, Bishoy M. Faltas |
| Rok vydání: |
2023 |
| Popis: |
Advanced urothelial cancer is a frequently lethal disease characterized by marked genetic heterogeneity. In this study, we investigate the evolution of the genomic signatures caused by endogenous and external mutagenic stimuli and their interplay with complex structural variants. We superimposed mutational signatures and phylogenetic analyses of matched serial tumors from patients with urothelial cancer to define the evolutionary patterns of these processes. We show that APOBEC3-induced mutations are clonal and early, whereas mutational bursts comprising hundreds of late subclonal mutations are induced by chemotherapy. Using a novel genome graph computational paradigm, we observed frequent circular high copy-number amplicons characteristic of extrachromosomal DNA (ecDNA) involving double-minutes, breakage-fusion-bridge, and tyfonas events. We characterized the distinct temporal patterns of APOBEC3 mutations and chemotherapy-induced mutations within ecDNA, gaining new insights into the timing of these events relative to ecDNA biogenesis. Finally, we discovered that mostCCND1amplifications in urothelial cancer arise within circular ecDNA amplicons. TheseCCND1ecDNA amplification events persisted and increased in complexity incorporating additional DNA segments potentially contributing selective fitness advantage to the evolution of treatment resistance. Our findings define fundamental mechanisms driving urothelial cancer evolution and have therapeutic implications for treating this disease. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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