SLC39A6 — Solute Carrier Family 39 Member 6

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SLC39A6 — Solute Carrier Family 39 Member 6

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SLC39A6 — Solute Carrier Family 39 Member 6

<div class="infobox infobox-gene">
| | |
|:---|:---|
| Gene Symbol | SLC39A6 |
| Full Name | Solute Carrier Family 39 Member 6 |
| Common Aliases | ZIP6, LIV-1 |
| Chromosomal Location | 18q12.3 |
| NCBI Gene ID | 201131 |
| OMIM ID | 607337 |
| Ensembl ID | ENSG00000141431 |
| UniProt ID | Q9GZP8 |
| Protein Length | 647 amino acids |
| Protein Family | ZIP (Zrt-, Irt-like Protein) transporter family |
</div>

Overview

SLC39A6 (also known as ZIP6) encodes a zinc transporter protein belonging to the ZIP (Zrt-, Irt-like Protein) family, a group of proteins critical for cellular zinc homeostasis. Zinc is an essential trace element serving as a catalytic cofactor for over 300 enzymes and a structural component of numerous proteins. In the brain, zinc plays crucial roles in synaptic transmission, neuronal signaling, and protection against oxidative stress. The SLC39A6 protein facilitates zinc uptake into cells, contributing to intracellular zinc balance and serving as a key component of the metallostasis network that maintains zinc homeostasis in the central nervous system. [@liuzzi2004]

...

SLC39A6 — Solute Carrier Family 39 Member 6

<div class="infobox infobox-gene">
| | |
|:---|:---|
| Gene Symbol | SLC39A6 |
| Full Name | Solute Carrier Family 39 Member 6 |
| Common Aliases | ZIP6, LIV-1 |
| Chromosomal Location | 18q12.3 |
| NCBI Gene ID | 201131 |
| OMIM ID | 607337 |
| Ensembl ID | ENSG00000141431 |
| UniProt ID | Q9GZP8 |
| Protein Length | 647 amino acids |
| Protein Family | ZIP (Zrt-, Irt-like Protein) transporter family |
</div>

Overview

SLC39A6 (also known as ZIP6) encodes a zinc transporter protein belonging to the ZIP (Zrt-, Irt-like Protein) family, a group of proteins critical for cellular zinc homeostasis. Zinc is an essential trace element serving as a catalytic cofactor for over 300 enzymes and a structural component of numerous proteins. In the brain, zinc plays crucial roles in synaptic transmission, neuronal signaling, and protection against oxidative stress. The SLC39A6 protein facilitates zinc uptake into cells, contributing to intracellular zinc balance and serving as a key component of the metallostasis network that maintains zinc homeostasis in the central nervous system. [@liuzzi2004]

Dysregulation of zinc homeostasis is increasingly recognized as a contributing factor in neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS). SLC39A6 and related zinc transporters are emerging as important players in these disease processes, with implications for understanding disease mechanisms and developing therapeutic interventions. [@kagara2012]

Protein Structure and Function

Structural Features

The ZIP family transporters, including SLC39A6, are characterized by several structural features:

Transmembrane domains: 8 transmembrane helices that form the transport pore
Extracellular loop: A long extracellular loop between transmembrane domains 3 and 4, containing potential metal binding sites
Variable cytoplasmic regions: N- and C-terminal domains facing the cytoplasm
HHE motif: A histidine-rich motif involved in zinc binding and transport
LIV-1 subfamily signature: ZIP6 contains the "LIV-1" region associated with hormone-dependent cancers

SLC39A6 is a member of the LIV-1 subfamily of ZIP transporters, named after the breast cancer marker "LIV-1" (Leukemia Virus-Integrase 1). This subfamily is characterized by additional sequence features and is often associated with epithelial-mesenchymal transition and cellular migration. [@sensel2001]

Transport Mechanism

ZIP transporters operate as symporters, transporting zinc ions along with bicarbonate ions into the cytoplasm. The transport process involves:

Substrate recognition: The extracellular loop recognizes Zn²⁺ ions

Conformational change: Zinc binding triggers a conformational shift

Ion transport: Zinc and bicarbonate are transported across the membrane

Release: Intracellular release of zinc ions

The bicarbonate co-transport distinguishes ZIP transporters from ZnT (SLC30) family transporters, which function as antiporters. This mechanism allows cells to accumulate zinc against concentration gradients. [@liuzzi2004]

Cellular Functions

In the nervous system, SLC39A6 participates in several critical functions:

Zinc uptake: Primary mechanism for zinc entry into neurons and glia
Synaptic zinc handling: Regulates synaptic zinc levels critical for neurotransmission
Neuronal development: Required for proper neuronal differentiation and process outgrowth
Gene expression regulation: Zinc-dependent transcription factors require adequate intracellular zinc
Antioxidant defense: Zinc serves as a cofactor for antioxidant enzymes

Expression Pattern

Brain Expression

SLC39A6 exhibits region-specific expression in the brain:

Hippocampus: Moderate expression in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
Cerebral cortex: Expression in layer 2-3 and layer 5-6 pyramidal neurons
Cerebellum: Purkinje cells show expression
Substantia nigra: Dopaminergic neurons express zinc transporters including ZIP6
Olfactory bulb: High expression in various neuronal populations

Cell-type specificity:

Neurons: Moderate to high expression, especially in glutamatergic neurons
Astrocytes: Lower expression, contributes to astrocytic zinc handling
Oligodendrocytes: Some expression, role in myelination
Microglia: Lower baseline expression, may increase in reactive states

Developmental Expression

ZIP6 expression is developmentally regulated:

Embryonic development: Early expression in neural tube and developing brain
Postnatal development: Increased expression during synaptogenesis
Adult brain: Maintained expression with some region-specific variation
Aging: Altered expression patterns associated with age-related zinc dyshomeostasis

Role in Neurodegenerative Diseases

Alzheimer's Disease

Zinc dyshomeostasis is a well-documented feature of Alzheimer's disease pathology:

Amyloid-beta interactions: Zn²⁺ binds to amyloid-beta peptides, promoting aggregation and plaque formation. The Zn²⁺-Aβ complex is more neurotoxic than Aβ alone, and zinc homeostasis disruption may accelerate amyloid pathology. [@ayton2013]

Tau pathology: Zinc influences tau phosphorylation through direct effects on kinases and phosphatases. Altered zinc transport may contribute to tau hyperphosphorylation and neurofibrillary tangle formation.

Synaptic zinc dysregulation: Synaptic Zn²⁺ handling is impaired in AD, affecting NMDA receptor function and synaptic plasticity. Zinc-dependent AMPA receptor trafficking is altered, contributing to memory deficits. [@lichter2017]

Oxidative stress: Zinc deficiency compromises antioxidant defenses, while zinc redistribution triggers oxidative stress. The balance between intracellular and extracellular zinc is critical for neuronal survival. [@adlard2015]

Metal-protein interaction hypothesis: Zinc, along with copper and iron, may contribute to oxidative damage through metal-catalyzed oxidation reactions in AD brains.

SLC39A6 expression alterations have been reported in AD brain tissue, though the specific changes and their functional significance continue to be investigated. The transporter may represent both a biomarker of zinc dyshomeostasis and a potential therapeutic target. [@dev2021]

Parkinson's Disease

Zinc homeostasis is increasingly implicated in PD pathogenesis:

Substantia nigra vulnerability: Dopaminergic neurons in the substantia nigra pars compacta are particularly vulnerable to zinc dysregulation due to their high metabolic demands and calcium handling properties.

α-Synuclein interactions: Zinc can accelerate α-synuclein aggregation and influence its cellular distribution. Altered zinc transport may affect the aggregation and toxicity of this protein.

Mitochondrial dysfunction: Zinc plays roles in mitochondrial function and antioxidant defense. Disrupted zinc homeostasis may exacerbate mitochondrial impairment in PD.

Neuroinflammation: Zinc modulates microglial activation and neuroinflammatory responses. Altered zinc transport may contribute to chronic neuroinflammation in PD.

Protein homeostasis impairment: The autophagy-lysosome system, crucial for protein clearance, is zinc-sensitive. Zinc dysregulation may impair protein quality control mechanisms.

Other Neurodegenerative Conditions

Amyotrophic Lateral Sclerosis (ALS): Zinc dysregulation has been reported in ALS models and patient tissue. Zinc homeostasis affects excitotoxicity and protein aggregation.
Huntington's Disease: Altered expression of zinc transporters in striatal tissue. Zinc-dependent processes may contribute to neuronal dysfunction.
Aging brain: Age-related decline in zinc homeostasis contributes to cognitive decline. ZIP6 alterations may be part of normal aging processes. [@oneill2013]

Signaling Pathways and Interactions

Zinc-Dependent Signaling

SLC39A6 interfaces with multiple zinc-dependent cellular processes:

Zinc finger transcription factors: Adequate intracellular zinc is required for the function of zinc finger proteins, including many transcription factors

Metallothioneins: Coordinate intracellular zinc storage and trafficking

Zinc-dependent enzymes: Carbonic anhydrases, matrix metalloproteinases, and other enzymes require zinc as a cofactor

Kinase/phosphatase signaling: Zinc modulates the activity of various kinases and phosphatases

Protein Interactions

SLC30A (ZnT) transporters: Coordinated action with zinc exporters maintains zinc balance
Metallothionein (MT) proteins: Cooperate in zinc buffering and trafficking
ZIP10 (SLC39A10): May form heterodimers or coordinate functionally
Rack1 (Receptor for Activated C Kinase 1): Interacts with ZIP6 in some cell types

Transcriptional Regulation

SLC39A6 expression is regulated by:

Zinc availability: Zinc sufficiency/deficiency influences transporter expression
Hormonal signals: Estrogen and other hormones affect ZIP6 expression
Cellular stress: Oxidative stress and inflammatory signals modulate expression
Developmental programs: Stage-specific expression during neural development

Therapeutic Implications

Therapeutic Strategies

Targeting zinc homeostasis represents a promising therapeutic approach:

Zinc supplementation: Careful zinc administration to address deficiency

Chelation strategies: Selective zinc chelation in specific cellular compartments

Transporter modulation: Developing compounds that modulate ZIP transporter activity

Gene therapy: Potential for delivering zinc transporter genes

Combination approaches: Combining zinc modulation with other interventions

Challenges

Several challenges complicate zinc-based therapies:

Biphasic effects: Both zinc deficiency and excess can be harmful
Compartmental targeting: Achieving specific targeting to brain regions or cell types
Temporal considerations: Optimal timing of intervention in disease progression
Transport complexity: Coordinating multiple zinc transporters and channels

Current Research Directions

Developing blood-brain barrier-penetrant zinc modulators
Identifying ZIP6-selective compounds
Understanding ZIP6 structure for rational drug design
Biomarker development for zinc homeostasis assessment

Animal Models

Knockout Studies

ZIP6 knockout mice: Developmental and phenotypic characterization ongoing
Zinc deficiency models: Dietary zinc manipulation affects ZIP expression
Transgenic models: Overexpression and conditional knockout systems

Disease Models

AD models: 5xFAD and APP/PS1 mice show altered zinc transporter expression
PD models: MPTP and 6-OHDA models reveal zinc dysregulation
Aging models: Age-related changes in zinc transporter expression

Clinical Relevance

Biomarkers

Serum/CSF zinc levels: Reflect systemic zinc status
ZIP6 expression: Potential tissue biomarker
Genetic variants: SLC39A6 polymorphisms may affect disease risk

Clinical Considerations

Zinc supplementation trials: Mixed results in AD and PD trials
Diagnostic potential: Zinc homeostasis as a biomarker
Individual variability: Genetic and lifestyle factors affecting zinc status

Research Methods

Gene expression analysis: qPCR, RNA-seq for ZIP6 expression
Protein localization: Immunohistochemistry in brain tissue
Functional assays: Zinc uptake measurements in cell culture
Animal models: Mouse and zebrafish genetic models
Clinical studies: Human brain tissue, CSF analysis

External Links

[NCBI Gene: SLC39A6](https://www.ncbi.nlm.nih.gov/gene/201131)
[UniProt: Q9GZP8](https://www.uniprot.org/uniprot/Q9GZP8)
[Ensembl: ENSG00000141431](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000141431)
[OMIM: 607337](https://www.omim.org/entry/607337)

Brain Atlas Resources

[Allen Human Brain Atlas - SLC39A6](https://human.brain-map.org/microarray/search/show?search_term=SLC39A6)
[BrainSpan Atlas of the Developing Human Brain](https://www.brainspan.org/search?gene=SLC39A6)
[Allen Mouse Brain Atlas](https://mouse.brain-map.org/search?query=SLC39A6)
[Allen Cell Type Atlas](https://celltypes.brain-map.org/)

References

[Meyer et al., The zinc transporter ZIP6 in cancer cell migration (2014)](https://pubmed.ncbi.nlm.nih.gov/23450128/)

[Liuzzi JP, Cousins RJ, Zinc transporters, ZnT and ZIP gene families (2004)](https://pubmed.ncbi.nlm.nih.gov/15090553/)

[Kagara et al., Zinc transporters and their role in the brain (2012)](https://pubmed.ncbi.nlm.nih.gov/22079367/)

[Sensel J et al., Identification and characterization of a new zinc transporter gene, ZIP-6 (2001)](https://pubmed.ncbi.nlm.nih.gov/11697102/)

[O'Neill CA et al., Zinc in the aging brain (2013)](https://pubmed.ncbi.nlm.nih.gov/23898264/)

[Ayton S et al., Synaptic Zn2+ homeostasis and its significance in Alzheimer's disease (2013)](https://pubmed.ncbi.nlm.nih.gov/23399570/)

[Crouch PJ et al., Therapeutic opportunities for targeting zinc in Alzheimer's disease (2009)](https://pubmed.ncbi.nlm.nih.gov/19728869/)

[Takeda A et al., Zinc homeostasis and brain function (2004)](https://pubmed.ncbi.nlm.nih.gov/15263475/)

[Frederickson CJ et al., Neurobiology of zinc in the brain (2005)](https://pubmed.ncbi.nlm.nih.gov/15970382/)

[Mathie A et al., Zinc and the zinc transporter ZnT/T1 in neuronal disease (2013)](https://pubmed.ncbi.nlm.nih.gov/22569852/)

[Barnett LM et al., ZIP6 expression in breast cancer and brain metastases (2012)](https://pubmed.ncbi.nlm.nih.gov/22361854/)

[Mihara E et al., ZIP6 and ZIP10 are involved in neural development (2018)](https://pubmed.ncbi.nlm.nih.gov/29251731/)

[Yang L et al., Role of zinc transporters in neurodegenerative diseases (2020)](https://pubmed.ncbi.nlm.nih.gov/33024447/)

[Dev S et al., Zinc dyshomeostasis in Alzheimer's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/33814476/)

[Szczepanska J et al., Zinc signaling in the aging brain (2020)](https://pubmed.ncbi.nlm.nih.gov/31791845/)

[Adlard PA et al., Metal dyshomeostasis and oxidative stress in Alzheimer's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/25563476/)

[Whitbread AK et al., Zinc homeostasis and synaptic plasticity in the aging brain (2019)](https://pubmed.ncbi.nlm.nih.gov/31708761/)

[Song W et al., ZnT proteins in neuronal function and disease (2018)](https://pubmed.ncbi.nlm.nih.gov/29663138/)

[Lichter K et al., ZIP10 regulates AMPA receptor trafficking in hippocampal neurons (2017)](https://pubmed.ncbi.nlm.nih.gov/28623236/)

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SLC39A6

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slug	genes-slc39a6
kg_node_id	SLC39A6
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-28ab6b8313d7
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-slc39a6'}
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📊 Evidence Profile Foundational

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📗 Cite This Artifact

SLC39A6 — Solute Carrier Family 39 Member 6

SLC39A6 — Solute Carrier Family 39 Member 6

Overview

SLC39A6 — Solute Carrier Family 39 Member 6

Overview

Protein Structure and Function

Structural Features

Transport Mechanism

Cellular Functions

Expression Pattern

Brain Expression

Developmental Expression

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Other Neurodegenerative Conditions

Signaling Pathways and Interactions

Zinc-Dependent Signaling

Protein Interactions

Transcriptional Regulation

Therapeutic Implications

Therapeutic Strategies

Challenges

Current Research Directions

Animal Models

Knockout Studies

Disease Models

Clinical Relevance

Biomarkers

Clinical Considerations

Research Methods

See Also

External Links

Brain Atlas Resources

References

💬 Discussion