Activation of cyclic GMP-AMP synthase by self-DNA causes autoimmune diseases

Daxing Gao, Tuo Li, Xiao Dong Li, Xiang Chen, Quan Zhen Li, Mary Wight-Carter, Zhijian J. Chen

Research output: Contribution to journalArticle

166 Citations (Scopus)

Abstract

TREX1 is an exonuclease that digests DNA in the cytoplasm. Lossof-function mutations of TREX1 are linked to Aicardi-Goutieres Syndrome (AGS) and systemic lupus erythematosus (SLE) in humans. Trex1-/- mice exhibit autoimmune and inflammatory phenotypes that are associated with elevated expression of interferon (IFN)-induced genes (ISGs). Cyclic GMP-AMP (cGAMP) synthase (cGAS). is a cytosolic DNA sensor that activates the IFN pathway. Upon binding to DNA, cGAS is activated to catalyze the synthesis of cGAMP, which functions as a second messenger that binds and activates the adaptor protein STING to induce IFNs and other cytokines. Here we show that genetic ablation of cGas in Trex1-/- mice eliminated all detectable pathological and molecular phenotypes, including ISG induction, autoantibody production, aberrant T-cell activation, and lethality. Even deletion of just one allele of cGas largely rescued the phenotypes of Trex1-/- mice. Similarly, deletion of cGas in mice lacking DNaseII, a lysosomal enzyme that digests DNA, rescued the lethal autoimmune phenotypes of the DNaseII-/- mice. Through quantitative mass spectrometry, we found that cGAMP accumulated in mouse tissues deficient in Trex1 or DNaseII and that this accumulation was dependent on cGAS. These results demonstrate that cGAS activation causes the autoimmune diseases in Trex1-/- and DNaseII-/- mice and suggest that inhibition of cGASmay lead to prevention and treatment of some human autoimmune diseases caused by self-DNA.

Original languageEnglish (US)
Pages (from-to)E5699-E5705
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number42
DOIs
StatePublished - Oct 20 2015

Fingerprint

GMP synthase (glutamine-hydrolyzing)
Autoimmune Diseases
DNA
Phenotype
Interferons
Exodeoxyribonucleases
Second Messenger Systems
cyclic guanosine monophosphate-adenosine monophosphate
Systemic Lupus Erythematosus
Autoantibodies
Mass Spectrometry
Cytoplasm

Keywords

  • Autoimmune disease
  • CGAMP
  • CGAS
  • DNaseII
  • Trex1

ASJC Scopus subject areas

  • General

Cite this

Activation of cyclic GMP-AMP synthase by self-DNA causes autoimmune diseases. / Gao, Daxing; Li, Tuo; Li, Xiao Dong; Chen, Xiang; Li, Quan Zhen; Wight-Carter, Mary; Chen, Zhijian J.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, No. 42, 20.10.2015, p. E5699-E5705.

Research output: Contribution to journalArticle

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