BRCA2 abrogation triggers innate immune responses potentiated by treatment with PARP inhibitors

Timo Reisländer, Emilia Puig Lombardi, Florian J. Groelly, Ana Miar, Manuela Porru, Serena Di Vito, Benjamin Wright, Helen Lockstone, Annamaria Biroccio, Adrian Harris, Arturo Londoño-Vallejo, Madalena Tarsounas

Research output: Contribution to journalArticlepeer-review


Heterozygous germline mutations in BRCA2 predispose to breast and ovarian cancer. Contrary to non-cancerous cells, where BRCA2 deletion causes cell cycle arrest or cell death, tumors carrying BRCA2 inactivation continue to proliferate. Here we set out to investigate adaptation to loss of BRCA2 focusing on genome-wide transcriptome alterations. Human cells in which BRCA2 expression is inhibited for 4 or 28 days are subjected to RNA-seq analyses revealing a biphasic response to BRCA2 abrogation. The early, acute response consists of downregulation of genes involved in cell cycle progression, DNA replication and repair and is associated with cell cycle arrest in G1. Surprisingly, the late, chronic response consists predominantly of upregulation of interferon-stimulated genes (ISGs). Activation of the cGAS-STING-STAT pathway detected in these cells further substantiates the concept that BRCA2 abrogation triggers cell-intrinsic immune signaling. Importantly, we find that treatment with PARP inhibitors stimulates the interferon response in cells and tumors lacking BRCA2.

Original languageEnglish
JournalNature Communications
Issue number1
Publication statusPublished - Dec 1 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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