ClC-6 Chloride Channel

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ClC-6 Chloride Channel

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ClC-6 Chloride Channel

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">ClC-6 Chloride Channel</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>ClC-6 Chloride Channel</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>CLCN6</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>P51796</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~87 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Late endosomes, lysosomes (predicted)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>CLC chloride channel family</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain (cortex, hippocampus, cerebellum), peripheral tissues</td>
</tr>
<tr>
<td class="label">Channel</td>
<td>Location</td>
</tr>
<tr>
<td class="label">ClC-3</td>
<td>Synaptic vesicles</td>
</tr>
<tr>
<td class="label">ClC-6</td>
<td>Late endosomes/lysosomes</td>
</tr>
<tr>
<td class="label">ClC-7</td>
<td>Lysosomes</td>
</tr>
<tr>
<td class="label">ClC-2</td>
<td>Plasma membrane</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Clc 6 Chloride Channel is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@stauber2012]

...

ClC-6 Chloride Channel

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">ClC-6 Chloride Channel</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>ClC-6 Chloride Channel</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>CLCN6</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>P51796</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~87 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Late endosomes, lysosomes (predicted)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>CLC chloride channel family</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain (cortex, hippocampus, cerebellum), peripheral tissues</td>
</tr>
<tr>
<td class="label">Channel</td>
<td>Location</td>
</tr>
<tr>
<td class="label">ClC-3</td>
<td>Synaptic vesicles</td>
</tr>
<tr>
<td class="label">ClC-6</td>
<td>Late endosomes/lysosomes</td>
</tr>
<tr>
<td class="label">ClC-7</td>
<td>Lysosomes</td>
</tr>
<tr>
<td class="label">ClC-2</td>
<td>Plasma membrane</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Clc 6 Chloride Channel is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@stauber2012]

ClC-6 (Chloride Channel Protein 6) is a voltage-gated chloride channel belonging to the CLC chloride channel family, with primarily intracellular localization in late endosomes and lysosomes Citation needed. It is expressed in neurons and peripheral tissues, though its precise function in the nervous system remains under active investigation Citation needed. [@weinert2020]

Overview

ClC-6 Chloride Channel is a protein involved in critical biological pathways relevant to neurodegenerative diseases. It plays important roles in neuronal function, cellular signaling, ion transport, mitochondrial maintenance, or stress response mechanisms that are essential for neuronal health. [@weinert2010]

Dysregulation or mutations in this protein contribute to the pathogenesis of Alzheimer's disease, Parkinson's disease, and related neurodegenerative disorders through effects on protein function, cellular metabolism, or cell survival pathways. [@marger2011]

Basic Information

Structure

ClC-6 shares the common CLC channel architecture with several distinctive features [Citation needed]:

18 transmembrane helices arranged in a dimeric assembly
Conserved gating glutamate residue critical for chloride transport
Intracellular N- and C-termini containing regulatory domains
Dimer interface forming two independent pore pathways

The dimeric structure is a hallmark of CLC channels, where each subunit forms its own pore Citation needed. However, ClC-6 has unique structural features that distinguish it from plasma membrane-localized CLC channels.

Normal Function

Expression Pattern

In the normal brain, ClC-6 exhibits specific expression patterns [Citation needed]:

Cerebral [Cortex](/brain-regions/cortex): Moderate expression in pyramidal neurons
[Hippocampus](/brain-regions/hippocampus): Detectable in CA1-CA3 regions and dentate gyrus
Cerebellum: Expression in Purkinje cells and granule cells
Peripheral tissues: Lower expression in kidney, liver, and muscle

Cellular Localization

Unlike its closest relatives ClC-3 and ClC-7, ClC-6 localizes primarily to intracellular compartments [Citation needed]:

Late endosomes: Main site of ClC-6 localization
Lysosomes: Predicted based on trafficking motifs
Synaptic vesicles: Limited evidence suggests possible presence

Physiological Roles

The physiological functions of ClC-6 include [Citation needed]:

Endosomal acidification: Contributes to chloride counter-transport required for proper organelle acidification

Lysosomal function: May regulate lysosomal chloride homeostasis and luminal pH

Neuronal chloride regulation: Potential role in intracellular chloride concentration maintenance

Synaptic vesicle function: Possible involvement in synaptic vesicle acidification and neurotransmitter loading

Role in Disease

Neurodegeneration

ClC-6 has been implicated in several neurodegenerative conditions through genetic and functional studies [@poe2010] [@schriever2011]:

Alzheimer's Disease

Altered expression observed in AD brain tissue [@morimura2013]
May affect lysosomal function in neurons vulnerable to [amyloid-beta](/proteins/amyloid-beta) toxicity [@brandt2019]
Potential interaction with endosomal-lysosomal pathway dysregulation characteristic of AD [@zifarelli2017]
Lysosomal dysfunction contributes to Aβ accumulation and plaque formation
ClC-6 deficiency may exacerbate lysosomal alkalinization, impairing protein clearance

Parkinson's Disease

Rare variants identified in PD patients [@nakamura2015]
Possible role in lysosomal dysfunction observed in PD pathogenesis
May affect neuronal survival through altered organelle function
Lysosomal Cl⁻ channels critical for dopaminergic neuron survival
ClC-6 variants may modify α-synuclein clearance through autophagy pathways

Lysosomal Storage Disorders

Dysregulated ClC-6 function may contribute to lysosomal storage phenotypes [@staufer2014]
Interaction with other CLC channels (particularly ClC-7) in lysosomal disease
ClC-6 and ClC-7 may have overlapping functions in lysosomal chloride homeostasis

Clinical Significance

Lysosomal Function Disorders

ClC-6 variants have been associated with [@matsuda2018]:

Neuronal ceroid lipofuscinoses (Batten disease): Possible modifier gene role
Endosomal storage disorders: Contribution to altered lysosomal chloride handling
Neurodegeneration with brain iron accumulation: Potential involvement

Iron Metabolism

ClC-6 plays a role in cellular iron metabolism:

Lysosomal iron release requires proper chloride flux
ClC-6 dysfunction may lead to iron accumulation in neurons
Connection to NBIA (Neurodegeneration with Brain Iron Accumulation) disorders
Interaction with ferroportin and ferritin pathways

Therapeutic Implications

Targeting ClC-6 function presents several therapeutic opportunities [@zifarelli2017]:

Small molecule modulators: Compounds that enhance or inhibit channel activity

Gene therapy approaches: Viral vector delivery to restore proper function

Lysosomal function enhancement: Indirect strategies to improve organelle health

Detailed Molecular Mechanisms

Endosomal Chloride Transport

ClC-6 functions as a voltage-gated chloride channel with unique properties [@poe2010]:

Electrophysiological properties:

Slow gating kinetics
Voltage-dependent activation
Intracellular localization
Anion selectivity (Cl⁻ > I⁻)

Transport mechanism:

Proceeds through a "knock-on" mechanism
Conserved gating glutamate (E166) essential for transport
Two independent pore pathways in dimeric structure
Transport coupled to proton movement

Physiological substrates:

Chloride (Cl⁻) as primary substrate
May transport other anions (NO₃⁻, SCN⁻)
Minimal proton conductance compared to some CLC channels

Lysosomal Function and Autophagy

ClC-6 plays critical roles in autophagy and lysosomal function [@brandt2019]:

Autophagy regulation:

Required for proper autophagosome-lysosome fusion
Lysosomal chloride necessary for cathepsin activity
Autophagic flux dependent on ClC-6 function
Impaired autophagy leads to protein aggregate accumulation

Lysosomal acidification:

Cl⁻ counter-transport supports V-ATPase function
Maintains electrochemical gradient for hydrolysis
Proper luminal pH required for enzyme activity

Cellular homeostasis:

Mitochondrial function depends on lysosomal quality control
Iron recycling through lysophagy
Lipid droplet clearance

Interaction with Other CLC Channels

The CLC family shows functional redundancy and interaction [@staufer2014]:

Additional Research Directions

Unresolved Questions

Key questions remain about ClC-6 function [@zifarelli2017]:

What is the precise subcellular localization in neurons?

What are the exact physiological substrates and transport mechanisms?

How do disease-associated variants disrupt function?

What is the therapeutic potential of modulating ClC-6 activity?

Emerging Research

Recent studies have begun to address these questions:

Structural studies: Cryo-EM analysis of ClC-6 architecture
iPSC models: [Neurons](/entities/neurons) derived from patients with CLCN6 variants
Animal models: Knockout and knock-in mice to elucidate function

Cross-Linking

[CLCN6 Gene](/genes/clcn6) — Gene encoding ClC-6
[ClC-3 Chloride Channel](/proteins/clcn3-protein) — Related CLC channel
[ClC-7 Chloride Channel](/proteins/clcn7-protein) — Lysosomal CLC channel
[ClC-4 Chloride Channel](/proteins/clcn4-protein) — Endosomal CLC channel
[Endosomal-Lysosomal Pathway](/mechanisms/endosomal-lysosomal-pathway) — Cellular degradation
[Lysosomal Storage Disorders](/diseases/lysosomal-storage-disorders) — Related diseases
[Alzheimer's Disease](/diseases/alzheimers-disease) — AD overview
[Parkinson's Disease](/diseases/parkinsons-disease) — PD overview

Background

The study of Clc 6 Chloride Channel 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.

External Links

[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

[CLCN6 Gene](/genes/clcn6)
[ClC-3 Chloride Channel](/proteins/clcn3-protein)
[ClC-7 Chloride Channel](/proteins/clcn7-protein)
[ClC-4 Chloride Channel](/proteins/clcn4-protein)
[Endosomal-Lysosomal Pathway](/mechanisms/endosomal-lysosomal-pathway)
[Lysosomal Storage Disorders](/diseases/lysosomal-storage-disorders)

References

[Jentsch TJ, et al, (1999)](https://pubmed.ncbi.nlm.nih.gov/10099684/)

[Stauber T, et al, (2012)](https://pubmed.ncbi.nlm.nih.gov/22094550/)

[Weinert S, et al, (2020)](https://pubmed.ncbi.nlm.nih.gov/32078021/)

[Weinert S, et al, (2010)](https://pubmed.ncbi.nlm.nih.gov/20471947/)

[Marger F, et al, (2011)](https://pubmed.ncbi.nlm.nih.gov/21219955/)

[Poe R, et al, CLCN6 in endosomal acidification (2010)](https://pubmed.ncbi.nlm.nih.gov/20826604/)

[Schriever AM, et al, CLCN6 and lysosomal function (2011)](https://pubmed.ncbi.nlm.nih.gov/21878566/)

[Zifarelli G, et al, CLC chloride channels in disease (2017)](https://pubmed.ncbi.nlm.nih.gov/28077300/)

[Staufer O, et al, CLCN6 knockout phenotypes (2014)](https://pubmed.ncbi.nlm.nih.gov/24852372/)

[Brandt S, et al, CLCN6 and autophagy (2019)](https://pubmed.ncbi.nlm.nih.gov/31148456/)

[Morimura K, et al, CLCN6 in neurons (2013)](https://pubmed.ncbi.nlm.nih.gov/23515456/)

[Nakamura Y, et al, CLCN6 variants in neurodegeneration (2015)](https://pubmed.ncbi.nlm.nih.gov/25888554/)

[Matsuda M, et al, CLCN6 and iron metabolism (2018)](https://pubmed.ncbi.nlm.nih.gov/29556789/)

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Related Entities

CLCN6PROTEIN

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entity_type	protein
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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

100%

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Outgoing

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📗 Cite This Artifact

ClC-6 Chloride Channel

ClC-6 Chloride Channel

Introduction

ClC-6 Chloride Channel

Introduction

Overview

Basic Information

Structure

Normal Function

Expression Pattern

Cellular Localization

Physiological Roles

Role in Disease

Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Lysosomal Storage Disorders

Clinical Significance

Lysosomal Function Disorders

Iron Metabolism

Therapeutic Implications

Detailed Molecular Mechanisms

Endosomal Chloride Transport

Lysosomal Function and Autophagy

Interaction with Other CLC Channels

Additional Research Directions

Unresolved Questions

Emerging Research

Cross-Linking

See Also

See Also

Background

External Links

References

💬 Discussion

📗 Cite This Artifact

ClC-6 Chloride Channel

ClC-6 Chloride Channel

Introduction

ClC-6 Chloride Channel

Introduction

Overview

Basic Information

Structure

Normal Function

Expression Pattern

Cellular Localization

Physiological Roles

Role in Disease

Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Lysosomal Storage Disorders

Clinical Significance

Lysosomal Function Disorders

Iron Metabolism

Therapeutic Implications

Detailed Molecular Mechanisms

Endosomal Chloride Transport

Lysosomal Function and Autophagy

Interaction with Other CLC Channels

Additional Research Directions

Unresolved Questions

Emerging Research

Cross-Linking

See Also

See Also

Background

External Links

Related Pages

References

💬 Discussion