SLC13A1 — Solute Carrier Family 13 Member 1 (Na+-dependent sulfate transporter)
active
wiki pageCreated: 2026-04-02T07:19:31By: crosslink-migrationQuality:
50%✓ SciDEXID: wiki-genes-slc13a1
📖 Wiki Page
gene580 wordssynced 2026-04-02
SLC13A1 — Solute Carrier Family 13 Member 1 (Na+-dependent sulfate transporter)
Overview
SLC13A1, also known as NaS1 (sodium-sulfate cotransporter 1), is a gene encoding a transmembrane protein responsible for active sulfate transport across cell membranes. This sodium-dependent sulfate transporter belongs to the solute carrier family 13, a group of transporters that couple the energy of sodium ion gradients to the movement of organic anions and inorganic ions. SLC13A1 is constitutively expressed across multiple tissues including the kidneys, liver, intestines, and notably in the central nervous system. The protein functions as an electrogenic antiporter, using the sodium electrochemical gradient to drive sulfate accumulation into cells, a process essential for maintaining cellular sulfate homeostasis and supporting sulfate-dependent biosynthetic pathways.
Function/Biology
The SLC13A1 protein operates as a secondary active transporter, utilizing the inward sodium gradient (maintained by Na+/K+-ATPase) to cotransport sulfate anions (SO₄²⁻) into cells. The transport mechanism follows a 2:1 sulfate-to-sodium stoichiometry, meaning each transport cycle moves two sulfate ions inward coupled with one sodium ion. This electrogenic transport generates a net inward current, and operates bidirectionally depending on the electrochemical gradients across the membrane.
...
SLC13A1 — Solute Carrier Family 13 Member 1 (Na+-dependent sulfate transporter)
Overview
SLC13A1, also known as NaS1 (sodium-sulfate cotransporter 1), is a gene encoding a transmembrane protein responsible for active sulfate transport across cell membranes. This sodium-dependent sulfate transporter belongs to the solute carrier family 13, a group of transporters that couple the energy of sodium ion gradients to the movement of organic anions and inorganic ions. SLC13A1 is constitutively expressed across multiple tissues including the kidneys, liver, intestines, and notably in the central nervous system. The protein functions as an electrogenic antiporter, using the sodium electrochemical gradient to drive sulfate accumulation into cells, a process essential for maintaining cellular sulfate homeostasis and supporting sulfate-dependent biosynthetic pathways.
Function/Biology
The SLC13A1 protein operates as a secondary active transporter, utilizing the inward sodium gradient (maintained by Na+/K+-ATPase) to cotransport sulfate anions (SO₄²⁻) into cells. The transport mechanism follows a 2:1 sulfate-to-sodium stoichiometry, meaning each transport cycle moves two sulfate ions inward coupled with one sodium ion. This electrogenic transport generates a net inward current, and operates bidirectionally depending on the electrochemical gradients across the membrane.
Sulfate serves critical functions in cellular biology, particularly as a substrate for sulfation reactions catalyzed by sulfotransferases. These reactions are essential for modifying proteins, lipids, and carbohydrates through post-translational modifications. Sulfated glycosaminoglycans (GAGs), proteoglycans, and sulfated steroids represent major sulfate-consuming molecules. In the nervous system, sulfation reactions are particularly important for extracellular matrix components, cell adhesion molecules, and signaling mediators. The regulation of SLC13A1 expression responds to cellular sulfate demand, with increased transporter levels observed during periods of high sulfate consumption.
Role in Neurodegeneration
While SLC13A1 has not been the focus of extensive neurodegeneration research, emerging evidence suggests potential involvement in neurodegenerative processes through several mechanisms. Sulfate deficiency or impaired sulfate transport could compromise the synthesis of sulfated compounds critical for neuronal function and survival. Proteoglycans containing sulfated GAGs, particularly heparan sulfate proteoglycans, regulate amyloid-beta aggregation and tau protein interactions—key pathological hallmarks of Alzheimer's disease. Reduced sulfation capacity through diminished SLC13A1 expression could accelerate amyloid accumulation and tau pathology.
Additionally, sulfation of extracellular matrix components supports synaptic stability and neuroinflammatory regulation. Impaired sulfate availability may compromise blood-brain barrier integrity and facilitate neuroinflammation, processes implicated in multiple neurodegenerative conditions including Parkinson's disease, amyotrophic lateral sclerosis, and neuroinflammatory dementia. Sulfate-dependent chondroitin sulfate synthesis, which influences neural migration and axonal guidance during development and repair processes, could be compromised by SLC13A1 dysfunction.
Molecular Mechanisms
SLC13A1 encodes a protein with 12 transmembrane domains characteristic of the solute carrier superfamily. The transporter contains conserved signature motifs involved in substrate binding and sodium coupling. Regulation occurs at multiple levels: transcriptional control through sulfate-responsive elements, post-translational modification including phosphorylation affecting membrane trafficking, and allosteric modulation by intracellular sulfate concentrations (feedback inhibition at high levels). Protein kinase C and other signaling cascades phosphorylate SLC13A1, modulating its transport activity in response to cellular signaling states.
Clinical/Research Significance
SLC13A1 mutations have been identified in individuals with antenatal bartter syndrome, characterized by renal salt-wasting and electrolyte abnormalities, though neurological manifestations remain understudied. The transporter represents a potential therapeutic target for conditions involving dysregulated sulfate homeostasis or impaired proteoglycan synthesis. Further investigation into SLC13A1 expression patterns in neurodegenerative disease brain tissue and genetic association studies could illuminate its relevance to neurodegeneration.