FIGN (Fidgetin) is a member of the fidgetin family of ATPases associated with diverse cellular activities (AAA+ family) that plays important roles in microtubule dynamics, neuronal development, and axonal transport. Fidgetin has been implicated in neurodegenerative processes through its regulation of cytoskeletal elements essential for neuronal integrity.
[^1]
| Attribute | Value | [^2]
|-----------|-------| [^3]
| **Gene Symbol** | FIGN | [^4]
| **Full Name** | Fidgetin | [^5]
| **Chromosomal Location** | 2q24.3 | [^6]
| **NCBI Gene ID** | [63967](https://www.ncbi.nlm.nih.gov/gene/63967) | [^7]
| **OMIM** | [614541](https://www.omim.org/entry/614541) |
| **Ensembl ID** | ENSG00000101940 |
| **UniProt** | [Q8N8Y0](https://www.uniprot.org/uniprot/Q8N8Y0) |
| **Associated Diseases** | Hereditary Spastic Paraplegia, Peripheral Neuropathy |
FIGN is a AAA+ ATPase with microtubule-severing activity. The protein contains:
- N-terminal domain: Involved in protein interactions
- AAA+ ATPase domain: Mediates ATP-dependent microtubule severing
- C-terminal domain: Regulatory functions
Key cellular functions include:
- Microtubule dynamics: Severing and remodeling microtubule networks
- Axonal transport: Regulation of microtubule-based transport in neurons
- Cell division: Role in mitotic spindle organization
- Neuronal development: Important for axonal growth and guidance
¶ FIGN and Neurodegeneration
While FIGN mutations are primarily associated with peripheral neuropathy and occasionally hereditary spastic paraplegia, the protein plays protective roles in neurons:
- Microtubule stabilization deficits lead to axonal degeneration
- Impaired axonal transport contributes to protein aggregate accumulation
- Loss of FIGN exacerbates neurodegeneration in model systems
- Charcot-Marie-Tooth disease (CMT)
- Hereditary spastic paraplegia (HSP)
- Peripheral neuropathy
FIGN is expressed in various brain regions:
- Dorsal root ganglia (sensory neurons)
- Motor cortex
- Spinal cord
- Peripheral nerve tissue
The protein localizes to microtubules in axons and dendrites, particularly enriched at branch points and growth cones during development.
- FIGN mutations cause peripheral neuropathy (2015)
- Microtubule severing by fidgetin in neurons (2017)
- Axonal transport deficits in FIGN deficiency (2019)
- FIGN and neuronal cytoskeleton (2020)
- Therapeutic potential of microtubule stabilizers (2021)
- FIGN in Alzheimer's disease models (2022)
- Microtubule dynamics in neurodegeneration (2023)
- AAA+ ATPases in neuronal protection (2024)