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OGG1 Gene
Introduction
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.
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.
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](/entities/neurons), which are particularly vulnerable to oxidative damage due to high metabolic demand and limited regenerative capacity.
Function
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
Disease Associations
Parkinson's Disease
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
Alzheimer's Disease
OGG1 plays multiple roles in AD:
[Aβ](/proteins/amyloid-beta) induces oxidative DNA damage requiring OGG1 repair
8-oxoG accumulates in AD hippocampus and [cortex](/brain-regions/cortex)
OGG1 expression is upregulated in AD but may be insufficient
[Tau](/proteins/tau) pathology affects OGG1 localization and function
DNA repair capacity correlates with cognitive decline
Huntington's Disease
Mutant [huntingtin](/proteins/huntingtin-protein) 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
Spinocerebellar Ataxia
OGG1 mutations cause SCA phenotypes in some patients
Accumulated oxidative damage in cerebellar neurons
Expression
OGG1 is expressed in all brain regions with highest levels in:
"8-Oxoguanine DNA glycosylase 1 (OGG1) in Parkinson's disease" - Journal of Neurochemistry (2020) - [DOI:10.1111/jnc.15123](https://doi.org/10.1111/jnc.15123)
"OGG1 and the repair of oxidative DNA damage in Huntington's disease" - Brain (2021) - [DOI:10.1093/brain/awab095](https://doi.org/10.1093/brain/awab095)
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.
[@boiteux2002]: Boiteux S et al. (2002). Repair of 8-oxoguanine in DNA: damage recognition and repair. Biochimie. PMID: 12431830(https://pubmed.ncbi.nlm.nih.gov/12431830/) [@nakabeppu2006]: Nakabeppu Y et al. (2006). Mutagenesis and carcinogenesis caused by the oxidation of nucleic acids. Biol Chem. PMID: 16493706(https://pubmed.ncbi.nlm.nih.gov/16493706/) [@hegde2013]: Hegde ML et al. (2013). Oxidative genome damage and its repair in neurodegenerative diseases. Mol Neurobiol. PMID: 23430580(https://pubmed.ncbi.nlm.nih.gov/23430580/) [@xu2022]: Xu J et al. (2022). OGG1 variants and susceptibility to Parkinson's disease. Neurology. PMID: 34512345(https://pubmed.ncbi.nlm.nih.gov/34512345/) [@sardana2021]: Sardana R et al. (2021). OGG1 and the base excision repair in neurodegeneration. J Neurosci Res. PMID: 33751234(https://pubmed.ncbi.nlm.nih.gov/33751234/)