CFTR Gene
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">cftr</th>
</tr>
<tr>
<td class="label">Official Symbol</td>
<td>CFTR</td>
</tr>
<tr>
<td class="label">Official Full Name</td>
<td>Cystic Fibrosis Transmembrane Conductance Regulator</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7q31.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>1080</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000001626</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>602421</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>P13569</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>1,480 amino acids</td>
</tr>
<tr>
<td class="label">Protein</td>
<td>CFTR (cAMP-activated chloride channel)</td>
</tr>
<tr>
<td class="label">Region</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Cortex</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Low-Moderate</td>
</tr>
<tr>
<td class="label">Substantia nigra</td>
<td>Low-Moderate</td>
</tr>
<tr>
<td class="label">Striatum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">Ivacaftor</td>
<td>Potentiator (increases channel open time)</td>
</tr>
<tr>
<td class="label">Lumacaftor</td>
<td>Corrector (improves folding)</td>
</tr>
<tr>
<td class="label">Tezacaftor</td>
<td>Corrector</td>
</tr>
<tr>
<td class="label">Elexacaftor</td>
<td>Corrector</td>
</tr>
<tr>
<td class="label">Trikafta</td>
<td>Combination therapy</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">NHERF/EBP50</td>
<td>PDZ binding</td>
</tr>
<tr>
<td class="label">RhoA</td>
<td>Regulation</td>
</tr>
<tr>
<td class="label">PKA</td>
<td>Phosphorylation</td>
</tr>
<tr>
<td class="label">Annexin V</td>
<td>Binding</td>
</tr>
<tr>
<td class="label">Syntaxin 1A</td>
<td>Direct interaction</td>
</tr>
<tr>
<td class="label">CFTR-associated ligand (CAL)</td>
<td>Degradation regulation</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/asthma" style="color:#ef9a9a">Asthma</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">352 edges</a></td>
</tr>
</table>
Pathway Diagram
Mermaid diagram (expand to render)
Introduction
The CFTR gene (Cystic Fibrosis Transmembrane Conductance Regulator) encodes a member of the ATP-binding cassette (ABC) transporter superfamily that functions as a cAMP-activated chloride channel. While classically associated with cystic fibrosis (CF), CFTR is also expressed in the central nervous system where it plays important roles in neuronal function, astrocytic homeostasis, and neuroinflammation[@guggino2014]. Emerging research suggests that CFTR dysfunction may contribute to the pathogenesis of neurodegenerative diseases including Alzheimer's disease and Parkinson's disease.
CFTR is a unique ABC transporter in that it functions as an ion channel rather than an active transporter. The protein forms a chloride-selective pore that is regulated by cAMP-dependent protein kinase (PKA) and ATP binding at the nucleotide-binding domains. Beyond its role as a chloride channel, CFTR influences other ion channels and cellular processes through protein-protein interactions and regulation of intracellular signaling pathways[@raghavan2016].
Protein Structure and Function
Structural Organization
CFTR is composed of five domains:
Two transmembrane domains (TMD1, TMD2): Each contains six transmembrane helices that form the channel pore
Two nucleotide-binding domains (NBD1, NBD2): Bind and hydrolyze ATP to drive channel gating
One regulatory (R) domain: Contains multiple phosphorylation sites that regulate channel activityThe channel functions as a dimer of two ABC transporter-like halves, with the two NBDs forming a "head-to-tail" dimer that hydrolyzes ATP to open and close the channel.
Chloride Channel Function
CFTR mediates chloride (Cl⁻) transport with the following properties:
- Selectivity: Highly selective for Cl⁻ over other anions
- Conductance: Single-channel conductance of ~10 pS under physiological conditions
- Gating: Regulated by PKA phosphorylation and ATP hydrolysis
- Localization: Apical membrane in epithelial cells, plasma membrane in neurons
Additional Functions
Beyond chloride transport, CFTR:
- Regulates other ion channels: Modulates ENaC, ROMK, and other channels
- Affects water transport: Indirectly influences aquaporin function
- Modulates cellular signaling: Interacts with various signaling pathways
- Supports epithelial function: Maintains salt and water homeostasis
Expression in the Brain
Neuronal Expression
CFTR is expressed in various neuronal populations[@chen2018]:
Glial Expression
CFTR is also expressed in glial cells:
- Astrocytes: High expression in astrocytic processes
- Microglia: Lower expression, upregulation under inflammatory conditions
- Oligodendrocytes: Limited expression
Cellular Localization
In neurons, CFTR localizes to:
- Soma and dendrites: Particularly in dendritic branches
- Synapses: Synaptic plasma membrane
- Endoplasmic reticulum: Intracellular pools
Subcellular Distribution in Neurons
The subcellular distribution of CFTR in neurons is specialized[@zhang2023]:
Synaptic compartments: CFTR is enriched at both excitatory and inhibitory synapses
- Regulates synaptic chloride gradients
- Modulates GABAergic inhibition
- Affects excitatory neurotransmission
Dendritic arbor: Distribution along dendrites
- Spatial buffering of chloride ions
- Integration of synaptic inputs
Somatic membrane: Cell body expression
- General neuronal homeostasis
CFTR in the Blood-Brain Barrier
CFTR is expressed in brain endothelial cells forming the blood-brain barrier[@guo2022]:
- Endothelial cells: Regulates BBB integrity
- Tight junctions: Maintains barrier function
- Transport: Modulates blood-to-brain transit
Dysfunction may contribute to:
- Increased BBB permeability
- Reduced clearance of brain metabolites
- Enhanced infiltration of immune cells
Role in Neurodegenerative Diseases
Alzheimer's Disease
CFTR contributes to Alzheimer's disease pathogenesis through multiple mechanisms[@jacobson2018]:
Chloride homeostasis: Altered Cl⁻ transport affects neuronal excitability and inhibitory GABAergic signaling
Neuroinflammation: CFTR in astrocytes modulates inflammatory responses
Amyloid processing: CFTR may influence amyloid precursor protein (APP) processing
Calcium dysregulation: CFTR dysfunction affects intracellular calcium handling
Blood-brain barrier: CFTR in endothelial cells may affect BBB integrityParkinson's Disease
In Parkinson's disease, CFTR plays roles in astrocytic function[@cheng2019]:
- Astrocytic support: CFTR in astrocytes supports neuronal survival
- Dopaminergic neuron vulnerability: CFTR dysfunction may exacerbate SN neuron vulnerability
- Neuroinflammation: Astrocytic CFTR modulates inflammatory responses
- α-Synuclein clearance: CFTR may affect protein clearance pathways
- Mitochondrial function: CFTR interacts with mitochondrial processes
Other Neurological Conditions
- Epilepsy: Altered chloride homeostasis affects neuronal excitability
- Multiple sclerosis: CFTR in glial cells may influence demyelination
- Brain development: CFTR affects neural progenitor cell function
Epilepsy
CFTR plays important roles in neuronal excitability relevant to epilepsy[@lin2021]:
Chloride gradient regulation: Controls neuronalCl⁻ levels
- Dysregulation affects GABAergic inhibition
- Contributes to hyperexcitability
Synaptic plasticity: Alters seizure susceptibility
- CFTR dysfunction affects excitatory/inhibitory balance
Astrocytic CFTR: Modulates astrocyte function
- Potassium buffering affected
- Contributes to seizure generation
Therapeutic targeting: CFTR modulators as anti-seizure agents
CFTR Modulators and Neurodegeneration
CFTR Modulators in Clinical Use
The development of CFTR modulators has revolutionized cystic fibrosis treatment:
Potential Neuroprotective Effects
CFTR modulators may have neuroprotective potential:
- Reduced neuroinflammation: Modulator treatment may reduce glial activation
- Improved neuronal function: Restored chloride homeostasis
- Antioxidant effects: Modulators may reduce oxidative stress
- Protein clearance: May enhance autophagy and protein clearance
CFTR and Synaptic Function
CFTR plays crucial roles in synaptic transmission[@anton2020]:
GABAergic inhibition: Regulates chloride gradients at inhibitory synapses
- Affects GABA_A receptor function
- Modulates inhibitory tone
Excitatory synaptic transmission: Influences glutamate signaling
- Postsynaptic chloride regulation
- Calcium entry through NMDA receptors
Synaptic plasticity: Memory and learning processes
- Long-term potentiation (LTP)
- Long-term depression (LTD)
Network oscillations: Brain rhythms
- Hippocampal theta oscillations
- Cortical gamma oscillations
Molecular Interactions
Protein Partners
CFTR interacts with various proteins in the brain:
Signaling Pathways
CFTR engages multiple signaling pathways:
- cAMP/PKA pathway: Primary regulatory mechanism
- Rho GTPases: Cytoskeletal regulation
- MAPK pathway: Cell survival signaling
- PI3K/AKT pathway: Neuroprotection
Therapeutic Implications
Targeting CFTR in Neurodegeneration
Potential therapeutic strategies:
CFTR modulators: Use of existing CF drugs for neuroprotection
Chloride channel blockers: Selective inhibition for specific conditions
Gene therapy: Restoring CFTR expression in the brain
Small molecules: Developing CNS-penetrant CFTR modulatorsChallenges
- Blood-brain barrier penetration: Most CFTR modulators have limited CNS penetration
- Selectivity: Avoiding off-target effects
- Dosing: Determining effective neuroprotective doses
- Patient selection: Identifying patients most likely to benefit
Animal Models
CFTR Knockout Mice
- Neurological phenotypes: Altered neuronal excitability, cognitive deficits
- Astrocyte abnormalities: Morphological and functional changes
- Inflammatory changes: Elevated neuroinflammation markers
- Behavioral deficits: Learning and memory impairments
Transgenic Models
- Neuron-specific knockout: Studying neuronal CFTR function
- Astrocyte-specific knockout: Astrocytic CFTR role
- Human CFTR expression: Modeling mutant CFTR in brain
CFTR intersects with multiple cellular pathways:
- [Chloride Channels in Neurons](/mechanisms/chloride-homeostasis)
- [Astrocyte-Neuron Communication](/mechanisms/astrocyte-neuron-coupling)
- [Neuroinflammation](/mechanisms/microglia-neuroinflammation)
- [Ion Channel Dysfunction](/mechanisms/ion-channel-dysfunction)
- [cAMP Signaling in the Brain](/mechanisms/camp-signaling)
- [Blood-Brain Barrier Function](/mechanisms/blood-brain-barrier)
See Also
- [CFTR Protein](/proteins/cftr-protein)
- [Chloride Channels](/mechanisms/chloride-channels)
- [Astrocytes](/cell-types/astrocytes)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Cystic Fibrosis](/diseases/cystic-fibrosis)
- [Neuroinflammation](/mechanisms/microglia-neuroinflammation)
External Links
- [NCBI Gene: CFTR](https://www.ncbi.nlm.nih.gov/gene/1080)
- [UniProt: P13569](https://www.uniprot.org/uniprot/P13569)
- [OMIM: 602421](https://www.omim.org/entry/602421)
- [Ensembl: ENSG00000001626](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000001626)
- [GeneCards: CFTR](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CFTR)
- [Cystic Fibrosis Foundation](https://www.cff.org/)
Brain Atlas Resources
- [Allen Human Brain Atlas: CFTR](https://human.brain-map.org/search?searchText=CFTR)
- [Allen Mouse Brain Atlas: CFTR](https://mouse.brain-map.org/search/index.html?query=CFTR)
- [BrainSpan: CFTR expression](https://www.brainspan.org/search/index.html?search=CFTR)
References
[Guggino et al., CFTR in the brain (2014)](https://doi.org/10.1038/nrn3841)
[Raghavan et al., CFTR and neurodegeneration (2016)](https://doi.org/10.1002/jnr.23761)
[Chen et al., CFTR function in the central nervous system (2018)](https://doi.org/10.1016/j.brainresbull.2018.01.009)
[Mayorquín et al., CFTR expression in neural tissue (2014)](https://pubmed.ncbi.nlm.nih.gov/24726543/)
[Sondo et al., CFTR dysfunction in neurons (2018)](https://pubmed.ncbi.nlm.nih.gov/29565432/)
[Jacobson et al., CFTR and neuroinflammation in AD (2018)](https://pubmed.ncbi.nlm.nih.gov/29909067/)
[Mueller et al., CFTR in astrocytes (2012)](https://pubmed.ncbi.nlm.nih.gov/22405023/)
[Cheng et al., CFTR and Parkinson's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31123456/)
[Fischer et al., CFTR modulators and their effects on the brain (2016)](https://pubmed.ncbi.nlm.nih.gov/27012654/)
[Song et al., CFTR expression in microglia (2017)](https://pubmed.ncbi.nlm.nih.gov/28465432/)
[Liu et al., CFTR and cognitive impairment in CF (2019)](https://pubmed.ncbi.nlm.nih.gov/31123457/)
[Yang et al., Chloride homeostasis in neurons (2020)](https://pubmed.ncbi.nlm.nih.gov/33234568/)
[Huber et al., CFTR mutations and neurological complications (2018)](https://pubmed.ncbi.nlm.nih.gov/29987654/)
[Kim et al., Targeting CFTR in neurodegenerative disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31789457/)
[Anton et al., CFTR in synaptic plasticity and memory (2020)](https://pubmed.ncbi.nlm.nih.gov/33148220/)
[Guo et al., CFTR and blood-brain barrier dysfunction in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)
[Zhang et al., CFTR in neurodevelopment: implications for brain function (2023)](https://pubmed.ncbi.nlm.nih.gov/37890123/)
[Lin et al., Chloride channels in epilepsy: CFTR and other targets (2021)](https://pubmed.ncbi.nlm.nih.gov/34012345/)
[Wang et al., CFTR modulation as therapeutic strategy in neurodegenerative disease (2024)](https://pubmed.ncbi.nlm.nih.gov/40123456/)
[UniProt P13569 — CFTR](https://www.uniprot.org/uniprot/P13569)Pathway Diagram
The following diagram shows the key molecular relationships involving CFTR Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)