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Updated: Jul 18, 2026
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Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo
Published on: September 18, 2014
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Hunting down the elusive cytosolic-DNA sensor
1Department of Immunology, Harvard Medical School, Boston, MA 02115.
Summary
Zhijian Chen discovered the cyclic GMP-AMP synthase (cGAS) enzyme, which detects DNA in cells and triggers immune responses. This breakthrough explains how DNA activates innate immunity, offering new therapeutic avenues.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- The innate immune system's response to DNA was poorly understood.
- Identifying the specific sensor for cytosolic DNA was a critical unmet challenge.
Purpose of the Study:
- To identify the enzyme responsible for sensing cytosolic DNA and initiating inflammatory responses.
- To elucidate the mechanism by which DNA triggers innate immunity.
Main Methods:
- Utilized an innovative in vitro complementation system.
- Employed advanced biochemical techniques.
- Characterized the enzymatic activity and cellular localization of the identified protein.
Main Results:
- Identified cyclic GMP-AMP synthase (cGAS) as the primary sensor of cytosolic DNA.
- Demonstrated that cGAS catalyzes the synthesis of cyclic GMP-AMP (cGAMP), a key second messenger.
- Established cGAS-cGAMP signaling as a crucial pathway for innate immune activation.
Conclusions:
- The discovery of cGAS resolves a major mystery in innate immunity.
- cGAS-mediated DNA sensing has significant implications for treating infections, cancer, and autoimmune diseases.
- This finding opens new avenues for therapeutic intervention targeting inflammatory pathways.
