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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221358
Harnessing transcriptional regulation of alternative end-joining to predict cancer treatment
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Alternative end-joining (alt-EJ) is an error-prone DNA repair pathway that cancer cells deficient in homologous recombination rely on, making them vulnerable to synthetic lethality via inhibition of poly(ADP-ribose) polymerase (PARP). Targeting alt-EJ effector DNA polymerase theta (POL theta), which synergizes with PARP inhibitors and can overcome resistance, is of significant preclinical and clinical interest. However, the transcriptional regulation of alt-EJ and its interactions with processes driving cancer progression remain poorly understood. Here, we show that alt-EJ is suppressed by hypoxia while positively associated with MYC (myelocytomatosis oncogene) transcriptional activity. Hypoxia reduces PARP1 and POLQ expression, decreases MYC binding at their promoters, and lowers PARylation and alt-EJ-mediated DNA repair in cancer cells. Tumors with HIF1A mutations overexpress the alt-EJ gene signature. Inhibition of hypoxia-inducible factor 1 alpha or HIF1A expression depletion, combined with PARP or POL theta inhibition, synergistically reduces the colony-forming capacity of cancer cells. Deep learning reveals the anticorrelation between alt-EJ and hypoxia across regions in tumor images, and the predictions for these and MYC activity achieve area under the curve values between 0.70 and 0.86. These findings further highlight the critical role of hypoxia in modulating DNA repair and present a strategy for predicting and improving outcomes centered on targeting alt-EJ.
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ESPÍN, Roderic, MEDINA JOVER, Ferran, SIGÜENZA ANDRADE, Javier, FARRAN MATAS, Sònia, MATEO GONZÁLEZ, Francesca, FIGUERAS, Agnes, SANZ, Rosario t., VICENT, Guillermo pablo, SHABBIR, Arzoo, RUIZ AULADELL, Lara, RACIONERO ANDRÉS, Emilio, GARCÍA, Irene, BAIGES, Alexandra, FRANCO LUZÓN, Lídia, MARTÍNEZ TÉBAR, Adrián, PARDO CEA, Miguel ángel, MARTÍNEZ INIESTA, María, WANG, Xieng chen, CUYÀS, Elisabet, MENENDEZ, Javier a., LÓPEZ CERDA, Marta, MUÑOZ MORUNO, Purificación, RICHAUD, Ivonne, RAYA CHAMORRO, Ángel, FABREGAT, Isabel, VILLANUEVA, Alberto, SERRAT, Xènia, CERÓN MADRIGAL, Julián, ALEMANY, Montse, GUIX, Inés, HERENCIA ROPERO, Andrea, SERRA, Violeta, KRISHNAN, Rehna, MEKHAIL, Karim, HAKEM, Razq, BRUNA, Jordi, BARCELLOS HOFF, Mary helen, VIÑALS CANALS, Francesc, AYTÉS MENESES, Álvaro, PUJANA GENESTAR, M. ángel. Harnessing transcriptional regulation of alternative end-joining to predict cancer treatment. _NAR Cancer_. 2025. Vol. 7, núm. 1. [consulta: 26 de novembre de 2025]. ISSN: 2632-8674. [Disponible a: https://hdl.handle.net/2445/221358]