<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">POLE Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>DNA Polymerase Epsilon Catalytic Subunit</td></tr>
<tr><td><strong>Gene Symbol</strong></td><td>[POLE](/genes/pole)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q07864](https://www.uniprot.org/uniprot/Q07864)</td></tr>
<tr><td><strong>PDB ID</strong></td><td>6WNS, 6WOT, 5VBN</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>261 kDa (2308 amino acids)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (chromatin)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>DNA polymerase B family</td></tr>
<tr><td><strong>Brain Expression</strong></td><td>High in neurons, particularly in cortex and hippocampus</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">148 edges</a></td>
</tr>
</table>
</div>
<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">POLE Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>DNA Polymerase Epsilon Catalytic Subunit</td></tr>
<tr><td><strong>Gene Symbol</strong></td><td>[POLE](/genes/pole)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q07864](https://www.uniprot.org/uniprot/Q07864)</td></tr>
<tr><td><strong>PDB ID</strong></td><td>6WNS, 6WOT, 5VBN</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>261 kDa (2308 amino acids)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (chromatin)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>DNA polymerase B family</td></tr>
<tr><td><strong>Brain Expression</strong></td><td>High in neurons, particularly in cortex and hippocampus</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">148 edges</a></td>
</tr>
</table>
</div>
POLE (DNA Polymerase Epsilon Catalytic Subunit) is the catalytic subunit of DNA polymerase epsilon (Pol ε), the primary replicative polymerase responsible for leading strand DNA synthesis in eukaryotic cells. As one of three replicative DNA polymerases (Pol α, δ, and ε), Pol ε plays essential roles in DNA replication fidelity and genome stability. Beyond its canonical replicative function, POLE participates in DNA damage response pathways, transcription-coupled repair, and the maintenance of genomic integrity in post-mitotic neurons[@burgers2018].
Recent research has revealed important connections between POLE dysfunction and neurodegenerative diseases. The high metabolic activity and oxidative stress in neurons make them particularly vulnerable to DNA damage accumulation, and POLE's role in DNA repair becomes increasingly critical with aging. POLE mutations and polymorphisms have been associated with accelerated aging, neurodegeneration, and cancer predisposition syndromes[@hultin2021].
DNA polymerase epsilon was first identified in the 1970s as one of the three major DNA polymerases involved in eukaryotic DNA replication. POLE was cloned and characterized in the 1990s, revealing its role as the catalytic subunit of the heterodimeric Pol ε complex.
The protein is encoded by the POLE gene located on chromosome 12q24.3 in humans. The full-length protein comprises over 2300 amino acids and contains multiple functional domains essential for its polymerase activity, 3'→5' exonuclease proofreading, and protein-protein interactions.
POLE is a large, multi-domain protein with distinct functional regions[@garcia2018]:
The N-terminal region contains:
The central region includes:
The C-terminal region contains:
Pol ε is the primary enzyme responsible for leading strand DNA synthesis[@sale2013]:
POLE provides critical proofreading function:
POLE participates in the DNA damage response[@schmitt2017]:
POLE associates with chromatin through:
POLE dysfunction contributes to AD pathogenesis through multiple mechanisms[@攻击2020]:
Evidence:
POLE may contribute to PD through DNA repair mechanisms:
Evidence:
POLE mutations causeFILS syndrome (FILS):
POLE mutations cause ataxia-neuropathy syndrome[@koh2021]:
Neurons face unique DNA repair challenges[@gehrke2019]:
Unlike dividing cells, neurons must:
Neurons are particularly vulnerable because:
Neurons rely heavily on:
POLE function declines with age, contributing to the aging process[@matsumoto2019]:
POLE mutations cause premature aging:
POLE has dual relevance to cancer and neurodegeneration[@pomerantz2020]:
Key questions remain:
POLE (DNA Polymerase Epsilon) is essential for leading strand DNA replication and plays critical roles in maintaining genome integrity. Its proofreading function prevents mutations, while its participation in DNA damage responses protects neurons from genotoxic stress. POLE dysfunction contributes to Alzheimer's disease, Parkinson's disease, and other neurodegenerative conditions through impaired DNA repair and accelerated aging. The dual relevance of POLE to cancer and neurodegeneration highlights the complex relationship between genome maintenance and cellular viability. Understanding POLE's role in neurons offers therapeutic opportunities to enhance DNA repair, reduce DNA damage burden, and protect against age-related neurodegeneration.