SLC2A1 Gene

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SLC2A1 Gene

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SLC2A1 — Glucose Transporter 1 (GLUT1)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SLC2A1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>SLC2A1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Solute Carrier Family 2 Member 1 (Glucose Transporter 1)</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>GLUT1, SLC2A1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>1p34.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6513</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138140</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000117394</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P11166</td>
</tr>
<tr>
<td class="label">Gene Size</td>
<td>~42 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>10</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>492 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~54 kDa</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>GLUT1 Expression</td>
</tr>
<tr>
<td class="label">Brain capillary endothelial cells</td>
<td>Very high</td>
</tr>
<tr>
<td class="label">Astrocytes</td>
<td>High</td>
</tr>
<tr>
<td class="label">Oligodendrocytes</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Neural stem cells</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Mature neurons</td>
<td>Low (GLUT

...

SLC2A1 — Glucose Transporter 1 (GLUT1)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SLC2A1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>SLC2A1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Solute Carrier Family 2 Member 1 (Glucose Transporter 1)</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>GLUT1, SLC2A1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>1p34.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6513</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138140</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000117394</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P11166</td>
</tr>
<tr>
<td class="label">Gene Size</td>
<td>~42 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>10</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>492 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~54 kDa</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>GLUT1 Expression</td>
</tr>
<tr>
<td class="label">Brain capillary endothelial cells</td>
<td>Very high</td>
</tr>
<tr>
<td class="label">Astrocytes</td>
<td>High</td>
</tr>
<tr>
<td class="label">Oligodendrocytes</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Neural stem cells</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Mature neurons</td>
<td>Low (GLUT3 dominant)</td>
</tr>
<tr>
<td class="label">Microglia</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Tissue</td>
<td>GLUT1 Expression</td>
</tr>
<tr>
<td class="label">Brain (capillary endothelium)</td>
<td>Very high</td>
</tr>
<tr>
<td class="label">Brain (astrocytes)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Erythrocytes</td>
<td>Very high</td>
</tr>
<tr>
<td class="label">Testis</td>
<td>High</td>
</tr>
<tr>
<td class="label">Eye (retina)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Placenta</td>
<td>High</td>
</tr>
<tr>
<td class="label">Liver</td>
<td>Very low</td>
</tr>
<tr>
<td class="label">Muscle</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">GLUT1 expression upregulation</td>
<td>Increase transcription/translation</td>
</tr>
<tr>
<td class="label">Glycosylation enhancement</td>
<td>Improve BBB targeting</td>
</tr>
<tr>
<td class="label">Small molecule activators</td>
<td>Directly enhance transport activity</td>
</tr>
<tr>
<td class="label">Ketogenic diet</td>
<td>Provide ketone bodies as alternative fuel</td>
</tr>
<tr>
<td class="label">Ketone esters</td>
<td>Alternative ketone delivery</td>
</tr>
<tr>
<td class="label">Astrocyte metabolic support</td>
<td>Improve pericyte and astrocyte function</td>
</tr>
<tr>
<td class="label">Transporter</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">GLUT1</td>
<td>SLC2A1</td>
</tr>
<tr>
<td class="label">GLUT2</td>
<td>SLC2A2</td>
</tr>
<tr>
<td class="label">GLUT3</td>
<td>SLC2A3</td>
</tr>
<tr>
<td class="label">GLUT4</td>
<td>SLC2A4</td>
</tr>
<tr>
<td class="label">GLUT5</td>
<td>SLC2A5</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">136 edges</a></td>
</tr>
</table>

Overview

SLC2A1 (Solute Carrier Family 2 Member 1) encodes GLUT1 (Glucose Transporter 1), the principal glucose transporter expressed at the blood-brain barrier (BBB) and in many neural cell types [@mueckler1985]. GLUT1 is a facilitative glucose transporter belonging to the SLC2A family that provides the critical link between systemic glucose supply and cerebral energy metabolism. The protein is essential for brain function — it ensures that the highly energy-dependent neurons and glial cells receive a constant supply of glucose, the brain's primary fuel.

GLUT1 dysfunction is implicated in a spectrum of neurodegenerative conditions. In Alzheimer's disease, GLUT1 reduction at the BBB contributes to brain glucose hypometabolism, which is among the earliest detectable abnormalities in AD and precedes clinical symptoms by decades [@kalaria1989][@winkler2015]. In Parkinson's disease, GLUT1 expression in the substantia nigra is compromised, exacerbating the energy crisis that makes dopaminergic neurons particularly vulnerable [@barker2019]. Germline mutations in SLC2A1 cause GLUT1 deficiency syndrome, a metabolic encephalopathy characterized by early-onset epilepsy, developmental delay, and movement disorders, providing a human model of the consequences of impaired cerebral glucose transport [@jager2019][@williams2021].

Gene and Protein Structure

Genomic Organization

Protein Architecture

GLUT1 is a polytopic membrane protein with 12 transmembrane helices arranged in a characteristic major facilitator superfamily (MFS) fold [@mueckler1985]:

Mermaid diagram (expand to render)

Key structural features:

12 transmembrane domains: Form the glucose channel pore. The transmembrane helices are arranged in two bundles of six, creating an inward-facing and outward-facing conformation for alternating access transport

Intracellular N- and C-termini: The short intracellular termini contain regulatory phosphorylation sites and interact with signaling molecules

Extracellular loop 2 (ECL2): Contains N-linked glycosylation sites (Asn140, Asn206) that are critical for correct folding and BBB targeting

Inward-facing vs outward-facing conformations: GLUT1 alternates between conformations to facilitate facilitative diffusion

Structure-Function Relationship

The GLUT1 transporter operates by alternating-access mechanism:

Outward-facing state: Glucose-binding site exposed to extracellular space
Inward-facing state: Glucose-binding site exposed to cytoplasm
Transition: Substrate-induced conformational change moves glucose across the membrane

Key residues for glucose transport:

Q282, E380: Predicted to form the glucose-binding pocket
R400: Important for substrate recognition
H160: Contributes to proton coupling in some contexts

Biological Functions

Glucose Transport Across the Blood-Brain Barrier

GLUT1 is the primary glucose transporter at the neurovascular unit [@winkler2015]:

Mermaid diagram (expand to render)

Luminal membrane (blood-facing):

High-density GLUT1 expression on the apical/luminal surface of brain capillary endothelial cells
Captures glucose from blood (concentration ~5 mM under fasting conditions)
Provides high-capacity, insulin-independent glucose uptake

Abluminal membrane (brain-facing):

GLUT1 on the basolateral surface releases glucose into the brain interstitium
Rate matches neuronal demand under normal conditions

Astrocyte end-feet:

GLUT1 on astrocyte processes surrounding capillaries
Captures glucose for astrocyte metabolism and glycogen storage
Supports metabolic coupling between astrocytes and neurons

Glucose Transport in Neural Cells

GLUT1 is expressed beyond the BBB in multiple neural cell types:

Metabolic Functions

GLUT1-mediated glucose transport supports multiple neural functions:

ATP production: Glycolysis and oxidative phosphorylation fueled by imported glucose

Neurotransmitter synthesis: Glucose provides carbon for glutamate and GABA synthesis

Ion homeostasis: ATP-dependent Na+/K+-ATPase maintains resting potential

Action potentials: Activity-dependent glucose consumption during firing

Glial metabolism: Supports astrocyte glycogen storage and lactate production

Myelin maintenance: Oligodendrocyte glucose needs for lipid synthesis

Regulation of GLUT1

GLUT1 expression and activity are tightly regulated:

Transcriptional regulation:

Hypoxia-inducible factor (HIF-1α): Upregulates GLUT1 under low oxygen
cAMP/PKA pathway: Modulates GLUT1 transcription
Insulin-independent: Unlike GLUT4, GLUT1 is not acutely regulated by insulin

Post-translational regulation:

N-linked glycosylation: Required for correct trafficking to membrane
Kinase phosphorylation: PKA and AMPK can modulate activity
Proteolytic cleavage: Alternative splicing can produce truncated forms
Ubiquitination: Regulates protein stability

Cellular redistribution:

GLUT1 functions as a constitutively active transporter at the BBB
Unlike GLUT4, it does not undergo insulin-dependent translocation
Its regulation is primarily at the level of expression and degradation

Disease Associations

Alzheimer's Disease

GLUT1 reduction is among the earliest and most consistent metabolic abnormalities in AD [@kalaria1989][@cheng2018][@winkler2015][@chen2021]:

BBB GLUT1 reduction: Post-mortem studies consistently show decreased GLUT1 in AD cortex and hippocampus

Glucose hypometabolism: FDG-PET imaging reveals reduced cerebral glucose metabolism years before symptoms

Aβ-mediated downregulation: Amyloid-beta directly reduces GLUT1 expression through multiple pathways

Tau pathology interaction: GLUT1 reduction may accelerate tau phosphorylation through energy depletion

Vascular contributions: GLUT1 reduction in the BBB contributes to neurovascular uncoupling

Mechanistic cascade:

Mermaid diagram (expand to render)

Parkinson's Disease

GLUT1 dysfunction contributes to the selective vulnerability of dopaminergic neurons in PD [@barker2019]:

Reduced GLUT1 in substantia nigra: GLUT1 expression is decreased in PD SN pars compacta neurons

Energy crisis in dopaminergic neurons: These neurons have exceptionally high energy demands due to autonomous pacemaking

Mitochondrial interaction: GLUT1 dysfunction compounds the effects of mitochondrial complex I deficiency in PD

α-synuclein effects: α-synuclein pathology may impair glucose metabolism and GLUT1 function

Levodopa response: Glucose metabolism in the striatum predicts therapeutic response

GLUT1 Deficiency Syndrome (GLUT1DS)

Heterozygous SLC2A1 mutations cause GLUT1 deficiency syndrome, a metabolic encephalopathy [@jager2019][@williams2021]:

Clinical features:

Early-onset epilepsy (often intractable)
Developmental delay and intellectual disability
Ataxia and movement disorders (paroxysmal ataxia, dystonia)
Microcephaly
Hemolytic anemia (in some variants)

Genotype-phenotype correlations:

Loss-of-function mutations: More severe phenotypes
Haploinsufficiency: Variable severity, often milder
Dominant-negative effects: Some missense mutations act dominantly

Treatment:

Ketogenic diet: Provides ketone bodies as alternative brain fuel
Triheptanoin: Odd-chain fatty acid providing anaplerotic substrates
Classic KD: High-fat, low-carbohydrate diet (75-80% fat)
Modified Atkins: Less restrictive ketone-producing diet

Amyotrophic Lateral Sclerosis

GLUT1 dysfunction in ALS contributes to motor neuron energy failure [@murphy2020]:

Motor neuron vulnerability: Motor neurons have high metabolic demands and rely on glucose transport

GLUT1 in spinal cord: ALS spinal cord shows reduced GLUT1 in motor neurons and glia

SOD1 models: GLUT1 reduction precedes motor neuron loss in SOD1-G93A mice

Interaction with excitotoxicity: Energy depletion exacerbates glutamate-induced toxicity

Frontotemporal Dementia

GLUT1 reductions in FTD reflect metabolic contributions to non-AD dementia [@brockmann2022]:

Behavioral variant FTD: GLUT1 reduction in frontal cortex

C9orf72-associated FTD: Metabolic dysfunction as part of disease mechanism

Overlap with motor neuron disease: GLUT1 dysfunction in FTD-ALS spectrum

Stroke and Cerebrovascular Disease

GLUT1 at the BBB is a critical determinant of stroke outcome [@hernandez2020]:

Ischemic vulnerability: Areas with high GLUT1-dependent glucose metabolism are most vulnerable

Penumbra metabolism: GLUT1 expression in the ischemic penumbra determines salvageability

Post-stroke recovery: GLUT1 upregulation in recovery phase supports neurogenesis

Therapeutic targeting: Enhancing GLUT1 may improve post-stroke brain repair

Molecular Mechanisms

Energy Failure Cascade

GLUT1 reduction triggers a characteristic energy failure cascade:

Glucose import reduction: Less glucose enters the brain

ATP depletion: Glycolytic and oxidative phosphorylation are compromised

Ion pump failure: Na+/K+-ATPase and Ca2+-ATPase cannot maintain gradients

Membrane depolarization: Resting potential is disrupted

Calcium dysregulation: Intracellular calcium rises

Neurotransmitter imbalance: Synthesis is impaired, release is dysregulated

Synaptic failure: Both excitatory and inhibitory transmission are compromised

Neuronal death: If sustained, energy failure leads to cell death

Neurovascular Uncoupling

GLUT1 dysfunction at the BBB disrupts the coupling between neural activity and blood flow:

Baseline glucose supply: Reduced, limiting the ceiling of metabolic support

Activity-dependent increase: Impaired capacity to increase delivery during demands

fMRI signal: Contributes to the BOLD signal changes observed in neurodegenerative disease

Functional impairment: Cognitive performance correlates with vascular metabolic support

Interaction with Neurodegeneration Pathways

GLUT1 reduction interfaces with all major neurodegeneration mechanisms:

Aβ pathway: Aβ reduces GLUT1; reduced GLUT1 increases Aβ production
Tau pathway: Energy failure activates GSK3-β, accelerating tau phosphorylation
α-synuclein: Energy depletion sensitizes neurons to α-synuclein toxicity
Mitochondrial dysfunction: Synergistic energy crisis compounds both defects
Neuroinflammation: GLUT1 reduction in activated glia changes metabolic support

Expression Pattern

Tissue Distribution

Brain Regional Expression

Cortex: High in all layers, particularly layer 4
Hippocampus: High in CA1-CA3 and dentate gyrus
Cerebellum: Moderate in Purkinje cells and granule cells
Substantia nigra: Moderate to low in dopaminergic neurons
White matter: GLUT1 in myelin-producing cells (oligodendrocytes)
Spinal cord: Higher in ventral horn (motor neuron region)

Development

Fetal: GLUT1 expression appears early in brain capillary development
Postnatal: Increases during brain development, peaks in adulthood
Aging: GLUT1 expression gradually declines with age
Disease: Additional decline in neurodegenerative conditions

Therapeutic Implications

GLUT1 Enhancement Strategies

Targeting GLUT1 for neurodegeneration therapy [@liu2020]:

Biomarkers

GLUT1-related biomarkers for neurodegenerative disease:

CSF glucose: Not reliable — systemic glucose dominates
FDG-PET: Cerebral glucose metabolism as surrogate
BBB permeability markers: Soluble GLUT1 fragments (research)
Magnetic resonance spectroscopy: Brain glucose levels (experimental)

Ketogenic Interventions

The ketogenic diet bypasses GLUT1-dependent glucose transport by providing ketone bodies:

Mechanisms of ketone body benefit:

Ketone bodies enter the brain via MCT1 and MCT2 transporters (SLC16A1, SLC16A7)
Ketone bodies are more efficient fuels than glucose per molecule of oxygen
Ketone metabolism produces more ATP per molecule than glycolysis
Ketone bodies are neuroprotective through multiple mechanisms

Clinical evidence:

Effective in GLUT1 deficiency syndrome (direct treatment)
Benefits in some epilepsy patients (metabolic seizure suppression)
Emerging evidence in AD and PD (metabolic support)
Cognitive benefits in aging and MCI populations

Interaction Network

Glucose Transporters in Brain

Transport Partners

SLC16A1 (MCT1): Ketone body transporter, complementary function
SLC16A7 (MCT2): Neuronal ketone transporter
SLC2A3 (GLUT3): High-affinity neuronal glucose transporter (backup)
HIF1A: Transcription factor that upregulates SLC2A1
PIK3R1 (PI3K): Insulin signaling pathway cross-talk

Metabolic Enzymes

Hexokinases (HK1, HK2, HK3): Phosphorylate glucose after import
Glycogen synthase (GYS1): Astrocyte glycogen synthesis from imported glucose
Lactate dehydrogenase (LDHA/B): Conversion of glucose to lactate
PDH (PDHA1): Pyruvate dehydrogenase entry to mitochondria

Animal Models

GLUT1 Knockout Mice

Heterozygous KO (GLUT1+/-): Reduced BBB GLUT1, glucose hypometabolism, mild phenotypes
Homozygous KO: Lethal in embryogenesis (GLUT1 is essential for early development)
Conditional KO: Brain-specific deletion shows behavioral and cognitive deficits

GLUT1 Deficiency Models

SLC2A1 haploinsufficient mice: Recapitulate human GLUT1 deficiency syndrome
Epilepsy phenotype: Spontaneous seizures in GLUT1+/- mice
Movement disorder: Ataxia and dystonia features
Response to ketogenic diet: Phenotypic improvement with ketone body supplementation

Disease Models

5xFAD mice: Show reduced GLUT1 at BBB with aging
MPTP models: GLUT1 reduction in the substantia nigra
SOD1-G93A mice: GLUT1 reduction in motor neurons precedes symptoms
Aging models: GLUT1 decline with age, accelerates amyloid pathology

Cross-Links

[SLC2A3 (GLUT3)](/genes/slc2a3) — High-affinity neuronal glucose transporter
[SLC2A2 (GLUT2)](/genes/slc2a2) — Hepatocyte and astrocyte glucose transporter
[SLC16A1 (MCT1)](/genes/slc16a1) — Ketone body transporter at BBB
[SLC16A7 (MCT2)](/genes/slc16a7) — Neuronal ketone transporter

[Blood-Brain Barrier Transport](/mechanisms/bbb-transport-mechanisms) — Glucose entry mechanism
[Brain Energy Metabolism](/mechanisms/brain-energy-metabolism) — Glucose utilization pathways
[Neurovascular Coupling](/mechanisms/neurovascular-coupling) — Activity-dependent blood flow
[Ketogenic Diet in Neurodegeneration](/mechanisms/ketogenic-diet-neurodegeneration) — Alternative fuel strategy
[Cerebral Glucose Hypometabolism](/mechanisms/cerebral-glucose-hypometabolism) — AD biomarker

[Alzheimer's Disease](/diseases/alzheimers-disease) — Early glucose hypometabolism
[Parkinson's Disease](/diseases/parkinsons-disease) — Dopaminergic neuron energy crisis
[GLUT1 Deficiency Syndrome](/diseases/glut1-deficiency) — Direct GLUT1 mutation
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis) — Motor neuron energy failure
[Frontotemporal Dementia](/diseases/frontotemporal-dementia) — Metabolic dysfunction in bvFTD
[Stroke](/diseases/stroke) — Ischemic vulnerability

[Glycolysis in Brain](/mechanisms/glycolysis-brain)
[Mitochondrial Respiration](/mechanisms/mitochondrial-respiration)
[Ketone Body Metabolism](/mechanisms/ketone-body-metabolism)
[Neurovascular Unit Function](/mechanisms/neurovascular-unit-function)
[FDG-PET Imaging Biomarker](/mechanisms/fdg-pet-imaging)

Pathway Diagram

The following diagram shows the key molecular relationships involving SLC2A1 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

SLC2A1

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-slc2a1
kg_node_id	SLC2A1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-c626c7980476
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-slc2a1'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

40%

Debates

0

Incoming

8

Outgoing

31

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

SLC2A1 Gene

SLC2A1 — Glucose Transporter 1 (GLUT1)

SLC2A1 — Glucose Transporter 1 (GLUT1)

Overview

Gene and Protein Structure

Genomic Organization

Protein Architecture

Structure-Function Relationship

Biological Functions

Glucose Transport Across the Blood-Brain Barrier

Glucose Transport in Neural Cells

Metabolic Functions

Regulation of GLUT1

Disease Associations

Alzheimer's Disease

Parkinson's Disease

GLUT1 Deficiency Syndrome (GLUT1DS)

Amyotrophic Lateral Sclerosis

Frontotemporal Dementia

Stroke and Cerebrovascular Disease

Molecular Mechanisms

Energy Failure Cascade

Neurovascular Uncoupling

Interaction with Neurodegeneration Pathways

Expression Pattern

Tissue Distribution

Brain Regional Expression

Development

Therapeutic Implications

GLUT1 Enhancement Strategies

Biomarkers

Ketogenic Interventions

Interaction Network

Glucose Transporters in Brain

Transport Partners

Metabolic Enzymes

Animal Models

GLUT1 Knockout Mice

GLUT1 Deficiency Models

Disease Models

Cross-Links

Related Genes

Related Mechanisms

Related Diseases

Related Pathways

Pathway Diagram

💬 Discussion