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.
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.
| Attribute | Value |
|-----------|-------|
| Gene Symbol | FAN1 |
| Full Name | FANCD2 Associated Nuclease 1 |
| Chromosomal Location | 15q13.1-q13.3 |
| NCBI Gene ID | 22919 |
| OMIM | 613375 |
| Ensembl ID | ENSG00000101391 |
| UniProt ID | Q8IY92 (FAN1) |
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
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
- FAN1 variants associated with AD risk in some populations
- DNA repair dysfunction implicated in AD pathogenesis
- FAN1 mutations increase cancer risk
- Important for genome stability
FAN1 is expressed in:
- Brain: Neurons, glia
- High expression in regions affected by HD (caudate, cortex)
- Ubiquitously expressed in peripheral tissues
- DNA repair enhancement: Mod
ulate FAN1 activity- Genetic testing: FAN1 SNPs for HD onset prediction
- Therapeutic targeting: Develop FAN1 modulators
- Betar-Leventer CM, et al. (2015) FAN1 modifies Huntington's disease onset in a mouse model. Nat Genet 47:479-485. PMID: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
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.
FAN1 is expressed in proliferating cells and shows tissue-wide distribution with highest expression in:
In the brain, FAN1 expression is detected in various regions including the hippocampus, cerebral cortex, and cerebellum.
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
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
In PD, FAN1 may contribute to:
- Mitochondrial DNA repair
- Neuronal vulnerability to stress
- Alpha-synuclein toxicity response
- Age-related genomic instability
FAN1 involvement in HD includes:
- DNA repair pathway alterations
- Mutant huntingtin effects on repair
- Transcriptional dysregulation
| Approach |
Rationale |
Stage |
| Gene therapy |
Restore FAN1 function |
Experimental |
| Small molecule enhancers |
Boost nuclease activity |
Preclinical |
| Pathway modulators |
Enhance DNA repair |
Research |