Cytosolic DNA sensing by cGAS/STING promotes TRPV2-mediated Ca2+ release to protect stressed replication forks

Shan Li, Lingzhen Kong, Ying Meng, Chen Cheng, Delphine Sangotokun Lemacon, Zheng Yang, Ke Tan, Abigael Cheruiyot, Zhimin Lu, Zhongsheng You

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The protection of DNA replication forks under stress is essential for genome maintenance and cancer suppression. One mechanism of fork protection involves an elevation in intracellular Ca2+ ([Ca2+]i), which in turn activates CaMKK2 and AMPK to prevent uncontrolled fork processing by Exo1. How replication stress triggers [Ca2+]i elevation is unclear. Here, we report a role of cytosolic self-DNA (cytosDNA) and the ion channel TRPV2 in [Ca2+]i induction and fork protection. Replication stress leads to the generation of ssDNA and dsDNA species that, upon translocation into cytoplasm, trigger the activation of the sensor protein cGAS and the production of cGAMP. The subsequent binding of cGAMP to STING causes its dissociation from TRPV2, leading to TRPV2 derepression and Ca2+ release from the ER, which in turn activates the downstream signaling cascade to prevent fork degradation. This Ca2+-dependent genome protection pathway is also activated in response to replication stress caused by oncogene activation.

Original languageEnglish
Pages (from-to)556-573.e7
JournalMolecular cell
Volume83
Issue number4
DOIs
StatePublished - Feb 16 2023

Keywords

  • AMPK
  • CaMKK2
  • STING
  • TREX1
  • TRPV2
  • cGAS
  • cytosolic DNA
  • fork resection
  • intracellular Ca
  • replication stress

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