Related Experiment Video

Updated: Jan 13, 2026

Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo
11:44

Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo

Published on: September 18, 2014

9.3K

Innate immune sensing via the cGAS-STING pathway restricts extrachromosomal DNA-driven tumorigenesis

Tuo Li1,2,3, Qing-Lin Yang1,2,4, Kailiang Qiao4

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center.

Biorxiv : the Preprint Server for Biology
|January 9, 2026
PubMed

Insights

Cytosolic DNA sensor cGAS detects extrachromosomal DNA (ecDNA) fragments, activating immunity. Reactivating the cGAS-STING pathway suppresses ecDNA-driven tumors and restricts ecDNA formation, offering a new cancer therapy.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Extrachromosomal DNAs (ecDNAs) are prevalent in human cancers, amplifying oncogenes and driving tumor progression.
  • The interaction between ecDNAs and the immune system is not well understood.
  • ecDNAs contribute to tumor heterogeneity, therapy resistance, and poor prognosis.

Purpose of the Study:

  • To investigate the role of cytosolic DNA sensing in ecDNA-positive tumors.
  • To determine if the cGAS-STING pathway impacts ecDNA formation and tumor growth.
  • To explore the therapeutic potential of reactivating the cGAS-STING pathway in ecDNA-driven cancers.

Main Methods:

  • Detection of ecDNA fragments by the cGAS sensor in the cytoplasm.
  • Analysis of cGAS and STING silencing via promoter hypermethylation in ecDNA+ tumors.
  • Restoration of cGAS or STING function in human and murine cancer cells.
  • Assessment of tumor growth suppression in immunocompetent mouse models.
  • Investigation of ecDNA biogenesis using specific models.

Main Results:

  • The cGAS-STING pathway is activated by ecDNA fragments in the cytoplasm.
  • cGAS and STING are frequently silenced in ecDNA+ tumors.
  • Restoring cGAS or STING reactivates innate immune signaling and suppresses ecDNA+ tumor growth.
  • The cGAS-STING pathway restricts the formation of new ecDNAs.

Conclusions:

  • Innate immune sensing acts as a natural barrier against ecDNA-driven oncogenesis.
  • Reactivation of the cGAS-STING pathway is a promising therapeutic strategy for ecDNA+ cancers.
Keywords:
DNA methylationSTINGcGAScancerecDNAinnate immunitymRNA lipid nanoparticles

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