H3K27me3 is a determinant of chemotolerance in triple-negative breast cancer - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

H3K27me3 is a determinant of chemotolerance in triple-negative breast cancer

Pacôme Prompsy
Adeline Durand
  • Fonction : Auteur
Anne-Marie Lyne
Camille Landragin
  • Fonction : Auteur
Amandine Trouchet
  • Fonction : Auteur
  • PersonId : 780884
  • IdRef : 223604593
Sabrina Tenreira Bento
  • Fonction : Auteur
Almut Eisele
Sophie Foulon
  • Fonction : Auteur
Léa Baudre
  • Fonction : Auteur
Kevin Grosselin
Mylène Bohec
  • Fonction : Auteur
Sylvain Baulande
Ahmed Dahmani
  • Fonction : Auteur
Laura Sourd
  • Fonction : Auteur
Eric Letouzé
Elisabetta Marangoni
Leïla Perié

Résumé

Summary Triple-negative breast cancer is associated with the worst prognosis and the highest risk of recurrence among all breast cancer subtypes 1 . Residual disease, formed by cancer cells persistent to chemotherapy, remains one of the major clinical challenges towards full cure 2,3 . There is now consensus that non-genetic processes contribute to chemoresistance in various tumor types, notably through the initial emergence of a reversible chemotolerant state 4–6 . Understanding non-genetic tumor evolution stands now as a prerequisite for the design of relevant combinatorial approaches to delay recurrence. Here we show that the repressive histone mark H3K27me3 is a determinant of cell fate under chemotherapy exposure, monitoring epigenomes, transcriptomes and lineage with single-cell resolution. We identify a reservoir of persister basal cells with EMT markers and activated TGF-β pathway leading to multiple chemoresistance phenotypes. We demonstrate that, in unchallenged cells, H3K27 methylation is a lock to the expression program of persister cells. Promoters are primed with both H3K4me3 and H3K27me3, and removing H3K27me3 is sufficient for their transcriptional activation. Leveraging lineage barcoding, we show that depleting H3K27me3 alters tumor cell fate under chemotherapy insult – a wider variety of tumor cells tolerate chemotherapy. Our results highlight how chromatin landscapes shape the potential of unchallenged cancer cells to respond to therapeutic stress.

Dates et versions

hal-03417195 , version 1 (05-11-2021)

Identifiants

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Justine Marsolier, Pacôme Prompsy, Adeline Durand, Anne-Marie Lyne, Camille Landragin, et al.. H3K27me3 is a determinant of chemotolerance in triple-negative breast cancer. 2021. ⟨hal-03417195⟩
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