Gosset Molecular Classification
DNA sequence, Pattern Recognition Receptor Ligand, Epigenetic regulator
Other Names
CpG dinucleotides, CpG motifs, CpG islands (CGIs), CpG ODNs (synthetic oligodeoxynucleotides)
Disease Roles
Cytosine-phosphate-Guanine DNA Overview
CpG DNA refers to regions of DNA where a cytosine nucleotide is followed by a guanine nucleotide. These sites are crucial for epigenetic regulation, with methylation leading to gene silencing and unmethylation enabling transcription. Unmethylated CpG motifs also act as pathogen-associated molecular patterns (PAMPs), activating the innate immune system. Synthetic CpG oligodeoxynucleotides (CpG ODNs) are used as immunostimulatory agents and vaccine adjuvants.
Mechanism of Action
CpG ODNs activate innate immune cells (macrophages, dendritic cells, NK cells, B cells) through pattern recognition receptors. Methylation status of CpG dinucleotides influences gene expression by affecting chromatin accessibility and transcription factor binding.
Biological Functions
Epigenetic regulation of gene expression
Innate immune system activation
Transcription initiation
Chromatin structure modulation
Disease Associations
Cancer
Infection
Autoimmune diseases
Inflammation
Safety Considerations
- Potential for excessive immune stimulation
- Off-target effects of CpG ODNs
- Unintended epigenetic modifications
Interacting Drugs
CpG ODNs (synthetic)
Associated Biomarkers
| Biomarker |
|---|
| CpG island methylation status (for cancer diagnosis/prognosis) |
| Immune cell activation markers (for CpG ODN efficacy) |
| ATF2 phosphorylation |