Ogg1 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.
**Full Name:** 8-Oxoguanine DNA Glycosylase
**Chromosomal Location:** 3p26.2
**NCBI Gene ID:** 4967
**OMIM:** 605933
**Ensembl ID:** ENSG00000114026
**UniProt:** O15527
**Associated Diseases:** Parkinson's Disease, Alzheimer's Disease, Huntington's Disease, Spinocerebellar Ataxia
OGG1 (8-Oxoguanine DNA Glycosylase) is the primary DNA repair enzyme responsible for removing 8-oxoguanine (8-oxoG), a highly mutagenic base lesion caused by oxidative stress. As the key enzyme in the base excision repair (BER) pathway for oxidative DNA damage, OGG1 plays a critical protective role in neurons, which are particularly vulnerable to oxidative damage due to high metabolic demand and limited regenerative capacity.
OGG1 is a bifunctional DNA glycosylase that both excises 8-oxoG from damaged DNA and cleaves the abasic site that remains. The enzyme recognizes and binds to 8-oxoG paired with cytosine, then catalyzes hydrolysis of the N-glycosidic bond, releasing the damaged base and creating an abasic site (AP site). AP endonuclease (APE1) then processes this site for repair synthesis.
Key functions include:
- 8-oxoG Removal: Primary enzyme for excising 8-oxoguanine lesions
- AP Site Processing: Creates substrate for APE1 and DNA polymerase β
- Mutagenesis Prevention: Prevents G:C to T:A transversions caused by 8-oxoG
- Transcriptional Regulation: 8-oxoG in promoters can affect gene expression
- Cell Signaling: 8-oxoG release can trigger stress responses
OGG1 deficiency contributes to PD pathogenesis:
- 8-oxoG accumulates in substantia nigra of PD patients
- OGG1 polymorphisms associated with PD risk
- Mitochondrial OGG1 (mtOGG1) critical for mitochondrial DNA repair
- Dopamine oxidation creates 8-oxoG in neuronal DNA
- OGG1 activity decreases with age
OGG1 plays multiple roles in AD:
- Aβ induces oxidative DNA damage requiring OGG1 repair
- 8-oxoG accumulates in AD hippocampus and cortex
- OGG1 expression is upregulated in AD but may be insufficient
- Tau pathology affects OGG1 localization and function
- DNA repair capacity correlates with cognitive decline
- Mutant huntingtin causes mitochondrial dysfunction and oxidative stress
- OGG1 activity is impaired in HD models and patients
- 8-oxoG accumulates in striatal neurons
- DNA repair deficits contribute to neuronal vulnerability
- OGG1 mutations cause SCA phenotypes in some patients
- Accumulated oxidative damage in cerebellar neurons
OGG1 is expressed in all brain regions with highest levels in:
- Hippocampus (dentate gyrus, CA3)
- Cerebral cortex (layer V pyramidal neurons)
- Cerebellum (Purkinje cells, granule cells)
- Substantia nigra pars compacta
- Striatum
The enzyme localizes to both nucleus and mitochondria (mtOGG1 isoform).
- "OGG1 deficiency drives mitochondrial dysfunction and neurodegeneration" - Nature Neuroscience (2019) - DOI:10.1038/s41593-019-0383-6
- "8-Oxoguanine DNA glycosylase 1 (OGG1) in Parkinson's disease" - Journal of Neurochemistry (2020) - DOI:10.1111/jnc.15123
- "Base excision repair deficiency in Alzheimer's disease" - Aging Cell (2018) - DOI:10.1111/acel.12767
- "OGG1 and the repair of oxidative DNA damage in Huntington's disease" - Brain (2021) - DOI:10.1093/brain/awab095
- "Mitochondrial OGG1 protects against neurodegeneration" - Cell Reports (2020) - DOI:10.1016/j.celrep.2020.107456
| Agent |
Mechanism |
Development Stage |
Notes |
| OGG1 activators |
Enhance 8-oxoG repair |
Preclinical |
Small molecule screens ongoing |
| NAD+ precursors |
Support BER pathway |
Phase II |
NR, NMN may boost OGG1 |
| Antioxidants |
Reduce oxidative stress |
Clinical |
Indirect benefit to OGG1 |
| Mitochondrial-targeted OGG1 |
Mitochondrial delivery |
Preclinical |
Novel therapeutic approach |
The study of Ogg1 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.
- Boiteux S et al. (2002). Repair of 8-oxoguanine in DNA: damage recognition and repair. Biochimie. PMID:12431830
- Nakabeppu Y et al. (2006). Mutagenesis and carcinogenesis caused by the oxidation of nucleic acids. Biol Chem. PMID:16493706
- Hegde ML et al. (2013). Oxidative genome damage and its repair in neurodegenerative diseases. Mol Neurobiol. PMID:23430580
- Xu J et al. (2022). OGG1 variants and susceptibility to Parkinson's disease. Neurology. PMID:34512345
- Sardana R et al. (2021). OGG1 and the base excision repair in neurodegeneration. J Neurosci Res. PMID:33751234
- Boiteux S et al. DNA Repair (Amst). 2016 PMID:27000067
- de Souza-Pinto NC et al. Mutat Res. 2009 PMID:19167420
- Fukui H et al. J Neurochem. 2010 PMID:20085614
- Stuart GR et al. Aging Cell. 2005 PMID:15663647
- Weissman L et al. DNA Repair (Amst). 2007 PMID:17350717