Cgas Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Official Symbol: CGAS
Official Full Name: Cyclic GMP-AMP Synthase
Location: Chromosome 6q15
Gene ID: 115004
Cyclic GMP-AMP Synthase (cGAS) is a DNA sensor that catalyzes the production of the second messenger cGAMP, leading to activation of the STING pathway and type I interferon responses. cGAS is emerging as a key player in neuroinflammation and neurodegenerative diseases.
The cGAS gene spans approximately 24 kb and consists of 8 exons. It encodes a protein of 522 amino acids (57 kDa).
cGAS contains:
- N-terminal unstructured region with regulatory functions
- C-terminal nucleotidyltransferase (NTase) domain
- DNA-binding surfaces
- STING interaction domain
cGAS detects double-stranded DNA in the cytosol:
- DNA Binding: Binds to foreign or self-DNA in cytoplasm
- cGAMP Production: Catalyzes ATP and GTP to cGAMP
- STING Activation: cGAMP binds and activates STING
- Type I IFN Induction: Leads to TBK1-IRF3 activation and IFN production
- Innate immune sensing of viral and bacterial DNA
- Detection of mitochondrial DNA released from damaged mitochondria
- Tumor surveillance
- Autoimmunity
cGAS is ubiquitously expressed:
- High expression in immune cells (macrophages, dendritic cells)
- Expressed in neurons, astrocytes, and microglia
- Can be upregulated by interferon stimulation
- Constitutively expressed in most cell types
- Activated by Aβ-induced mitochondrial DNA release
- Contributes to chronic neuroinflammation
- cGAS-STING pathway is hyperactivated in AD brain
- Therapeutic target for anti-inflammatory therapy
- α-Synuclein can activate cGAS
- Mitochondrial dysfunction leads to DNA release
- Contributes to dopaminergic neuron loss
- Links mitochondrial dysfunction to inflammation
- cGAS activation in motor neurons and glia
- Mutant SOD1 and FUS can trigger cGAS
- Contributes to neuroinflammation
- Therapeutic target
¶ Stroke and TBI
- DNA release from damaged cells activates cGAS
- Contributes to post-injury inflammation
- Potential for therapeutic intervention
| Disease |
Mechanism |
Evidence |
| Alzheimer's Disease |
Mitochondrial DNA sensing, neuroinflammation |
Postmortem studies, mouse models |
| Parkinson's Disease |
α-Synuclein activation |
Animal models |
| ALS |
Motor neuron inflammation |
Expression studies |
| Stroke |
Damage-associated DNA |
Preclinical models |
Targeting cGAS-STING pathway:
- cGAS Inhibitors: Reduce harmful inflammation
- STING Antagonists: Downstream blockade
- Combination Approaches: With other anti-inflammatory strategies
The study of Cgas Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- PMID:23416971 - cGAS is a cytosolic DNA sensor
- PMID:27312889 - cGAS in neurodegeneration
- PMID:29162638 - cGAS-STING in Alzheimer's disease
- PMID:30850394 - Mitochondrial DNA activates cGAS in PD