APE2 Protein is a protein encoded by the [APEX2](/genes/apex2) gene that ape2 plays critical roles in dna repair:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
APE2 (Apurinic/apyrimidinic Endonuclease 2) is a DNA repair enzyme involved in the base excision repair (BER) pathway, critical for maintaining genomic integrity in [neurons](/entities/neurons).
APE2 Protein is a protein encoded by the [APEX2](/genes/apex2) gene that ape2 plays critical roles in dna repair:. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
APE2 (Apurinic/apyrimidinic Endonuclease 2) is a DNA repair enzyme involved in the base excision repair (BER) pathway, critical for maintaining genomic integrity in [neurons](/entities/neurons).
HDEH motif: Conserved catalytic residues for endonuclease activity
Nuclear localization signal: Present in the C-terminal region
Normal Function
APE2 plays critical roles in DNA repair:
Base excision repair (BER): Cleaves apurinic/apyrimidinic (AP) sites
DNA damage response: Recognizes and repairs oxidative DNA damage
Cell cycle regulation: Checkpoint function in response to DNA damage
Mitochondrial DNA repair: Maintains mtDNA integrity
Transcriptional regulation: Interacts with chromatin remodeling complexes
Role in Neurodegeneration
Alzheimer's Disease
Elevated APE2 expression in AD brains - possibly compensatory
Increased DNA damage in AD neurons
Oxidative stress leads to base modifications requiring APE2 repair
May contribute to neuronal vulnerability
Parkinson's Disease
DNA repair deficits in dopaminergic neurons
APE2 may be affected by mitochondrial dysfunction
Contributes to progressive neuronal loss
Ataxia-Telangiectasia-like Disease (ATLD)
APE2 mutations cause ATLD-like syndrome (MIM 604121)
Features include cerebellar ataxia and immunodeficiency
Cancer (opposite role)
APE2 is overexpressed in multiple cancers
Supports tumor cell proliferation
Potential therapeutic target
Therapeutic Targeting
PARP inhibitors: Enhance DNA repair stress in cancer
DNA repair modulators: Being developed for neurodegeneration
Antioxidants: Reduce oxidative DNA damage burden
Gene therapy: Being explored for DNA repair disorders
Key Publications
[@tell2009]: Tell G, et al. [APE1/Ref-1: rescue of oxidative DNA damage](https://pubmed.ncbi.nlm.nih.gov/19268516/). Mutat Res. 2009;681(1):51-64.
[@vascotto2009]: Vascotto C, et al. [APE1/Ref-1: analysis of the mitochondrial interactome](https://pubmed.ncbi.nlm.nih.gov/19770079/). Front Biosci. 2009;14:4100-4120.
[@thakur2020]: Thakur S, et al. [AP endonuclease 2 and its role in DNA repair, neurological disease and cancer](https://pubmed.ncbi.nlm.nih.gov/33176127/). DNA Repair (Amst). 2020;95:102940.
[@weissman2011]: Weissman L, et al. [DNA damage and repair in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/21745637/). Prog Neuropsychopharmacol Biol Psychiatry. 2011;35(2):320-328.