Slc17A5 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.
| SLC17A5 - Solute Carrier Family 17 Member 5 | |
|---|---|
| Gene Symbol | SLC17A5 |
| Full Name | Solute Carrier Family 17 Member 5 (Sialin) |
| Chromosomal Location | 6q13 |
| NCBI Gene ID | 10228 |
| OMIM | 604716 |
| Ensembl ID | ENSG00000183040 |
| UniProt ID | Q9NRX3 |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Sialidosis, Infantile Sialic Acid Storage Disease |
| Protein | SLC17A5 Protein |
The SLC17A5 (Solute Carrier Family 17 Member 5) gene encodes sialin, a lysosomal membrane protein that functions as a sialic acid transporter and anion channel. Sialin is essential for maintaining lysosomal homeostasis by exporting sialic acid (N-acetylneuraminic acid) from lysosomes into the cytoplasm. Mutations in SLC17A5 cause severe lysosomal storage disorders known as sialidosis and infantile sialic acid storage disease (ISSD), while dysregulation is implicated in Alzheimer's disease, Parkinson's disease, and various metabolic conditions.
The SLC17A5 gene is located on chromosome 6q13 and encodes a protein of 495 amino acids. The gene structure includes:
Sialin functions as a proton-coupled sialic acid symporter:
Sialin enables recycling of sialylated glycoconjugates:
In neurons, sialin participates in:
SLC17A5 shows broad expression:
Sialin dysfunction contributes to AD through multiple mechanisms:
Amyloid precursor protein processing: Altered sialylation affects APP processing and amyloid-beta generation[2]
Lysosomal stress: Impaired sialic acid export leads to lysosomal dysfunction and impaired autophagic flux
Synaptic dysfunction: Altered sialylation of synaptic glycoproteins affects synaptic plasticity
Neuroinflammation: Dysregulated sialic acid metabolism modulates microglial activation
In Parkinson's disease, sialin plays important roles:
Dopaminergic neuron vulnerability: High sialin expression in substantia nigra makes these neurons susceptible to dysfunction
Alpha-synuclein interactions: Altered sialic acid metabolism affects alpha-synuclein aggregation and clearance[3]
Lysosomal impairment: General lysosomal dysfunction observed in PD includes sialin dysregulation
SLC17A5 mutations cause two related lysosomal storage disorders:
Sialidosis (Mucolipidosis I):
Infantile Sialic Acid Storage Disease (ISSD):
Targeting sialin offers therapeutic potential:
The study of Slc17A5 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.