🧬
| Gene | ALS2 |
|---|---|
| Protein | Alsin |
| UniProt | Q96Q42 |
| Molecular Weight | ~184 kDa |
| Localization | Cytoplasm, endosomes |
| Protein Family | ALS2 family |
| Associated Diseases | ALS, PLS, IAHSP |
Alsin is a protein encoded by the ALS2 gene that functions as a guanine nucleotide exchange factor (GEF) for small GTPases, primarily Rab5 and Rac1. It plays critical roles in endosomal trafficking, neuronal morphology, and mitochondrial function.
ALS2 (Alsin) is a Rab5 guanine nucleotide exchange factor (GEF) that regulates endosomal trafficking and axonal maintenance. Recessive ALS2 mutations cause juvenile-onset ALS (ALS2) and primary lateral sclerosis (PLS), characterized by upper motor neuron degeneration and spasticity. Alsin loss-of-function leads to impaired endosomal transport, mitochondrial dysfunction, and axonal degeneration in corticospinal motor neurons.
The ALS2 gene encodes a 1,637 amino acid protein with multiple functional domains:
| Property | Value |
|---|---|
| Gene | ALS2 |
| Protein | Alsin |
| UniProt | Q96Q42 |
| Molecular Weight | ~184 kDa |
| Subcellular Localization | Cytoplasm, endosomes |
| Protein Family | ALS2 family |
Alsin functions as a Rab5 GEF that regulates:
In neurons, alsin is particularly important for:
Recessive ALS2 mutations cause juvenile-onset forms of motor neuron disease:
Common ALS2 mutations include:
| Approach | Target | Status |
|---|---|---|
| Gene therapy (AAV-ALS2) | Restore alsin expression | Preclinical |
| Rab5 GEF modulators | Enhance endosomal function | Research |
| Mitochondrial protectants | Improve neuronal survival | Research |
The study of Als2 Protein (Alsin) 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.