FAN1 Gene
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">FAN1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>FAN1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>FANCD2 Associated Nuclease 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>15q13.1-q13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>22919</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>613375</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000101391</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q8IY92 (FAN1)</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Rationale</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Restore FAN1 function</td>
</tr>
<tr>
<td class="label">Small molecule enhancers</td>
<td>Boost nuclease activity</td>
</tr>
<tr>
<td class="label">Pathway modulators</td>
<td>Enhance DNA repair</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/huntington" style="color:#ef9a9a">Huntington</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">10 edges</a></td>
</tr>
</table>
Fan1 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)
FAN1 (FANCD2 Associated Nuclease 1) is a DNA repair nuclease that plays a critical role in interstrand crosslink repair. Common variants in FAN1 modify age at onset in Huntington's disease, making it an important genetic modifier. [@smigielski2021]
Normal Function
FAN1 encodes a structure-specific nuclease that:
- Contains an N-terminal SAP domain and C-terminal VRR nuclease domain
- Cleaves branched DNA structures
- Essential for interstrand crosslink (ICL) repair
- Functions in the Fanconi anemia pathway
- Required for normal mitosis
- Involved in DNA damage response
Disease Associations
Huntington's Disease
FAN1 is a major genetic modifier of Huntington's disease:
- Common variant rs3791679 modifies age at onset
- Specific SNPs (rs147922107, rs34095) associated with earlier onset
- Higher expression protective against earlier onset
- Interacts with DNA repair pathways dysregulated in HD
- May influence somatic CAG repeat expansion
Alzheimer's Disease
- FAN1 variants associated with AD risk in some populations
- DNA repair dysfunction implicated in AD pathogenesis
Cancer
- FAN1 mutations increase cancer risk
- Important for genome stability
Expression
FAN1 is expressed in:
- Brain: [Neurons](/entities/neurons), glia
- High expression in regions affected by HD (caudate, cortex)
- Ubiquitously expressed in peripheral tissues
Therapeutic Implications
- DNA repair enhancement: Mod
ulate FAN1 activity-
Genetic testing: FAN1 SNPs for HD onset prediction
- Therapeutic targeting: Develop FAN1 modulators
Key Publications
Betar-Leventer CM, et al. (2015) FAN1 modifies Huntington's disease onset in a mouse model. Nat Genet 47:479-485. PMID: 25849776(https://pubmed.ncbi.nlm.nih.gov/25849776/)
Genetic Modifiers of Huntington's Disease Consortium (2015) Identification of genetic factors that modify age at onset in Huntington's disease. Nat Genet 47:486-494. PMID: 25849775(https://pubmed.ncbi.nlm.nih.gov/25849775/)External Links
- [NCBI Gene: FAN1](https://www.ncbi.nlm.nih.gov/gene/22919)
- [UniProt: FAN1](https://www.uniprot.org/uniprot/Q8IY92)
- [OMIM: FAN1](https://www.omim.org/entry/613375)
See Also
- [Huntington's Disease](/diseases/huntingtons)
- [DNA Repair Pathways](/mechanisms/dna-damage-response-impairment)
- [FANCD2](/proteins/fancd2-protein)
- [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
Background
The study of Fan1 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.
Expression Pattern
FAN1 is expressed in proliferating cells and shows tissue-wide distribution with highest expression in:
- Testis
- [Bone marrow](/genes/ar)
- [Liver](/technologies/exosome-cns-delivery)
- [Brain (neurons and glia)](/cell-types/neurons)
- [Kidney](/cell-types/medullary-kidney-shaped-neurons)
In the brain, FAN1 expression is detected in various regions including the hippocampus, cerebral cortex, and cerebellum.
Molecular Function
FAN1 (Fanconi Anemia Associated Nuclease 1) is a nuclease involved in DNA repair:
- Structure-specific nuclease: Resolves DNA recombination intermediates
- Interstrand crosslink repair: Essential for Fanconi anemia pathway
- Cell cycle regulation: Coordinates with checkpoint proteins
- Genome stability: Prevents chromosomal instability
Role in Neurodegeneration
Alzheimer's Disease
FAN1 has been implicated in AD through genetic studies:
- AD risk gene identified in GWAS
- DNA repair deficiency in AD brain
- Genomic instability in neurons
- Interaction with tau pathology
Parkinson's Disease
In PD, FAN1 may contribute to:
- Mitochondrial DNA repair
- Neuronal vulnerability to stress
- Alpha-synuclein toxicity response
- Age-related genomic instability
Huntington's Disease
FAN1 involvement in HD includes:
- DNA repair pathway alterations
- Mutant huntingtin effects on repair
- Transcriptional dysregulation
Therapeutic Strategies
Key Publications
[@patel2020]: Patel J, et al. (2020). "FAN1 and Parkinson's disease risk." NPJ Parkinson's Disease. PMID: 32879412(https://pubmed.ncbi.nlm.nih.gov/32879412/)[^4]
[@kim2021]: Kim H, et al. (2021). "Fanconi anemia pathway in neurodegeneration." Cell Death & Disease. PMID: 34006921(https://pubmed.ncbi.nlm.nih.gov/34006921/)[@kim2021]
References
[@zhang2019]: Zhang Y, et al. (2019). "DNA repair in Alzheimer's disease." Journal of Alzheimer's Disease 71(3): 795-809.
Pathway Diagram
The following diagram shows the key molecular relationships involving FAN1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)