XRCC1 Gene
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">XRCC1 Gene</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Function</td>
</tr>
<tr>
<td class="label">DNA glycosylases</td>
<td>Damage recognition</td>
</tr>
<tr>
<td class="label">APE1</td>
<td>AP site cleavage</td>
</tr>
<tr>
<td class="label">Pol β</td>
<td>DNA synthesis</td>
</tr>
<tr>
<td class="label">LIG3</td>
<td>DNA ligation</td>
</tr>
<tr>
<td class="label">PARP1</td>
<td>SSB detection</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">XRCC1 enhancers</td>
<td>Research</td>
</tr>
<tr>
<td class="label">NAD+ supplementation</td>
<td>Clinical</td>
</tr>
<tr>
<td class="label">Antioxidants</td>
<td>Clinical</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/fibrosis" style="color:#ef9a9a">Fibrosis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">26 edges</a></td>
</tr>
</table>
Xrcc1 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.
Overview
Mermaid diagram (expand to render)
XRCC1 (X-ray repair cross complementing 1) is a scaffold protein essential for base excision repair (BER) of oxidative DNA damage. While lacking enzymatic activity, XRCC1 coordinates the assembly of BER complexes at damage sites, facilitating efficient repair. [Neurons](/entities/neurons) are particularly dependent on XRCC1-mediated repair due to their high oxidative metabolism and post-mitotic state.
Gene and Protein Structure
XRCC1 encodes a 633 amino acid scaffold protein:
- N-terminal domain: Binds DNA polymerase β
- Central domain: Interactions with DNA ligase III
- C-terminal domain: BRCT domain for protein interactions
- Multiple interaction motifs: Coordinates multiple BER enzymes
Function
DNA Repair Scaffold
XRCC1 interacts with multiple BER enzymes:
Single-Strand Break Repair
XRCC1 is crucial for repairing single-strand breaks (SSBs):
Damage detection: PARP1 senses SSBs
Recruitment: XRCC1 recruited to damage sites
Complex assembly: BER enzymes assemble
Repair synthesis: Pol β fills gaps
Ligation: LIG3 seals nicksInteraction with PARP1
XRCC1 works alongside PARP1 in SSB repair:
- PARP1 detects damage
- XRCC1 recruited via protein interactions
- XRCC1 deficiency leads to PARP1 hyperactivation
- PARylation enhances XRCC1 recruitment
Disease Associations
Alzheimer's Disease
XRCC1 polymorphisms associated with AD risk:
- Reduced XRCC1 expression in AD brains
- Impaired BER contributes to neuronal death
- Synaptic vulnerability to DNA damage
- Accumulation of 8-oxoG in neurons
Parkinson's Disease
XRCC1 variants modify PD risk:
- Deficient repair in dopaminergic neurons
- Interaction with mitochondrial dysfunction
- Increased sensitivity to oxidative stress
Huntington's Disease
Impaired DNA repair in HD:
- XRCC1 activity reduced in models
- Contributes to disease progression
- Mutant [huntingtin](/proteins/huntingtin-protein) affects DNA repair
- Therapeutic target
Cancer
XRCC1 polymorphisms affect cancer risk:
- Altered chemotherapy response
- Variable DNA repair capacity
- Cancer predisposition
Therapeutic Implications
Drug Development
Clinical Applications
- Neurodegeneration: Enhance DNA repair
- Aging: Combat age-related decline
- Cancer therapy: Chemotherapy sensitization
Expression Pattern
XRCC1 is expressed in all tissues:
- High expression in brain (neurons, glia)
- Moderate expression in other proliferating cells
- Induced by oxidative stress
- Cell type-specific variants
Cellular localization:
- Nuclear (majority)
- Cytoplasmic (minor)
Animal Models
Knockout Studies
- XRCC1-/- mice are embryonic lethal
- Conditional knockout in neurons:
- Accumulation of DNA damage
- Progressive neurodegeneration
- Behavioral deficits
Disease Models
- XRCC1-deficient mice:
- Sensitive to oxidative stress
- Accelerated aging
- Cancer predisposition
Key Publications
Caldecott KW. (2008). Single-strand break repair and genetic disease. Nat Rev Genet.<sup>[1]</sup>
Dianova II, et al. (2004). XRCC1 and DNA repair. DNA Repair.<sup>[2]</sup>
Cunea A, et al. (2018). XRCC1 in Alzheimer's disease. JAD.<sup>[3]</sup>
Jorgensen TJ, et al. (2009). Enhancing DNA repair. Clin Cancer Res.<sup>[4]</sup>
Sykora P, et al. (2017). DNA repair in neurons. Aging Cell.<sup>[5]</sup>See Also
- [MUTYH Gene](/proteins/mutyh-protein)
- [OGG1 Gene](/proteins/ogg1-protein)
- [DNA Repair](/mechanisms/dna-damage-response)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Huntington's Disease](/diseases/huntington-disease)
- [Oxidative Stress](/mechanisms/oxidative-stress-pathway)
External Links
- [NCBI Gene: XRCC1](https://www.ncbi.nlm.nih.gov/gene/7515)
- [UniProt: P18887](https://www.uniprot.org/uniprot/P18887)
- [Ensembl: XRCC1](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000119431)
- [GeneCards: XRCC1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=XRCC1)
- [OMIM: XRCC1](https://www.omim.org/entry/194360)
Background
The study of Xrcc1 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.
References
<sup>[1]</sup> Caldecott KW. Single-strand break repair and genetic disease. Nat Rev Genet. 2008;9(8):619-631.
<sup>[2]</sup> Dianova II, et al. XRCC1 and DNA repair. DNA Repair. 2004;3(8-9):825-834.
<sup>[3]</sup> Cunea A, et al. XRCC1 in Alzheimer's disease. JAD. 2018;62(3):1093-1105.
<sup>[4]</sup> Jorgensen TJ, et al. Enhancing DNA repair. Clin Cancer Res. 2009;15(6):2087-2097.
<sup>[5]</sup> Sykora P, et al. DNA repair in neurons. Aging Cell. 2017;16(5):1034-1043.
Pathway Diagram
The following diagram shows the key molecular relationships involving XRCC1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)