Potential cGAS-STING pathway functions in DNA damage responses, DNA replication and DNA repair.

Area of Science:

• Immunology
• Molecular Biology
• Cancer Biology

Background:

• The cyclic GMP-AMP (cGAMP) synthase (cGAS)-stimulator of interferon genes (STING) pathway is a key innate immune sensor for pathogen DNA.
• This pathway primarily activates inflammatory transcription via interferon regulatory factor 3 (IRF3) and nuclear factor kappa B (NF-kB), but also modulates cellular processes like autophagy.
• Mechanisms normally prevent cGAS activation by self-DNA, such as chromatin sequestration, but these fail under genotoxic stress.

Approach:

• This review synthesizes recent findings on the cGAS-STING pathway's role in sterile inflammation and cancer immunity.
• It examines the pathway's activation by self-DNA during genotoxic stress and chromosomal instability.
• The review also explores emerging evidence linking cGAS-STING components to the regulation of DNA damage response, checkpoint signaling, repair, and replication.

Key Points:

• Genotoxic stress and chromosomal instability disrupt self-DNA sequestration, leading to cGAS activation.
• Activated cGAS drives sterile inflammation and influences cell fate and immune responses in cancer.
• Emerging research suggests cGAS-STING pathway components actively regulate DNA damage response and replication.

Conclusions:

• The cGAS-STING pathway plays a dual role in sensing foreign DNA and responding to endogenous DNA damage, impacting inflammation and cancer.
• Understanding the interplay between cGAS-STING signaling and DNA damage responses is crucial for developing novel cancer immunotherapies.
• Further research is needed to elucidate the precise mechanisms by which cGAS-STING regulates DNA repair and replication processes.