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BMI1 nuclear location is critical for RAD51-dependent response to replication stress and drives chemoresistance in breast cancer stem cells

Abstract : Abstract Replication stress (RS) has a pivotal role in tumor initiation, progression, or therapeutic resistance. In this study, we depicted the mechanism of breast cancer stem cells’ (bCSCs) response to RS and its clinical implication. We demonstrated that bCSCs present a limited level of RS compared with non-bCSCs in patient samples. We described for the first time that the spatial nuclear location of BMI1 protein triggers RS response in breast cancers. Hence, in bCSCs, BMI1 is rapidly located to stalled replication forks to recruit RAD51 and activate homologous-recombination machinery, whereas in non-bCSCs BMI1 is trapped on demethylated 1q12 megasatellites precluding effective RS response. We further demonstrated that BMI1/RAD51 axis activation is necessary to prevent cisplatin-induced DNA damage and that treatment of patient-derived xenografts with a RAD51 inhibitor sensitizes tumor-initiating cells to cisplatin. The comprehensive view of replicative-stress response in bCSC has profound implications for understanding and improving therapeutic resistance.
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https://hal-amu.archives-ouvertes.fr/hal-03623505
Contributor : François Bertucci Connect in order to contact the contributor
Submitted on : Tuesday, March 29, 2022 - 5:16:45 PM
Last modification on : Tuesday, May 24, 2022 - 3:16:04 PM

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Violette Azzoni, Julien Wicinski, Manon Macario, Martin Castagné, Pascal Finetti, et al.. BMI1 nuclear location is critical for RAD51-dependent response to replication stress and drives chemoresistance in breast cancer stem cells. Cell Death and Disease, 2022, 13 (2), pp.96. ⟨10.1038/s41419-022-04538-w⟩. ⟨hal-03623505⟩

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