CING1 Gene

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CING1 Gene

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CING1 — Cingulin

Overview

CING1 (Cingulin 1) is a cytoskeletal protein originally identified at the cytoplasmic surface of tight junctions in epithelial and endothelial cells. The name "cingulin" derives from its localization to the "cingulum" or belt-like structure at tight junctions. While primarily studied in the context of epithelial barrier function, emerging evidence reveals that CING1 is also expressed in neuronal tissues, where it localizes to the postsynaptic density and plays important roles in synaptic organization, neuronal polarity, and potentially in neurodegenerative processes[@citi2001][@balda1993].

The protein functions as a scaffold that connects tight junction components to the actin cytoskeleton, regulating junction assembly, maintenance, and signaling. In neurons, cingulin may serve analogous functions at synaptic junctions, organizing postsynaptic machinery and contributing to synaptic plasticity mechanisms[@guillemot2008][@ohnishi2014].

| Property | Value |
|----------|-------|
| Gene Symbol | CING1 |
| Full Name | Cingulin |
| Chromosomal Location | 7p21.1 |
| NCBI Gene ID | 10484 |
| OMIM ID | 604267 |
| Ensembl ID | ENSG00000152240 |
| UniProt ID | Q9Z2X1 |
| Encoded Protein | Cingulin |
| Gene Type | Protein-coding |
| Protein Family | Cingulin family |
| Associated Diseases | Neurodegeneration, Brain Development Disorders, Epilepsy |

</div>

Structure and Function

Protein Structure

...

CING1 — Cingulin

Overview

CING1 (Cingulin 1) is a cytoskeletal protein originally identified at the cytoplasmic surface of tight junctions in epithelial and endothelial cells. The name "cingulin" derives from its localization to the "cingulum" or belt-like structure at tight junctions. While primarily studied in the context of epithelial barrier function, emerging evidence reveals that CING1 is also expressed in neuronal tissues, where it localizes to the postsynaptic density and plays important roles in synaptic organization, neuronal polarity, and potentially in neurodegenerative processes[@citi2001][@balda1993].

The protein functions as a scaffold that connects tight junction components to the actin cytoskeleton, regulating junction assembly, maintenance, and signaling. In neurons, cingulin may serve analogous functions at synaptic junctions, organizing postsynaptic machinery and contributing to synaptic plasticity mechanisms[@guillemot2008][@ohnishi2014].

| Property | Value |
|----------|-------|
| Gene Symbol | CING1 |
| Full Name | Cingulin |
| Chromosomal Location | 7p21.1 |
| NCBI Gene ID | 10484 |
| OMIM ID | 604267 |
| Ensembl ID | ENSG00000152240 |
| UniProt ID | Q9Z2X1 |
| Encoded Protein | Cingulin |
| Gene Type | Protein-coding |
| Protein Family | Cingulin family |
| Associated Diseases | Neurodegeneration, Brain Development Disorders, Epilepsy |

</div>

Structure and Function

Protein Structure

Cingulin is a large protein (approximately 140 kDa) with multiple functional domains that enable its roles as a scaffold and signaling adaptor:

N-terminal head domain: Contains binding sites for junctional proteins

Central coiled-coil region: Mediates dimerization

C-terminal tail: Interacts with cytoskeletal components and signaling proteins

Phosphorylation sites: Multiple serine/threonine residues regulate function

The protein forms homodimers through its coiled-coil domain, enabling cross-linking of junctional components[@schneider2010].

Tight Junction Functions

At epithelial and endothelial tight junctions, cingulin performs several critical functions[@guillemot2008]:

Scaffold function: Connects transmembrane tight junction proteins (claudins, occludin) to the actin cytoskeleton
Barrier regulation: Modulates paracellular permeability to ions and molecules
Signaling integration: Links junctional complexes to intracellular signaling pathways
Junction assembly: Essential for tight junction biogenesis during development

Neuronal Functions

In neurons, cingulin localizes to the postsynaptic density and contributes to synaptic organization[@yamanaka2015][@matsuda2016]:

Synaptic scaffolding: Organizes postsynaptic receptor complexes
Synaptic plasticity: Involved in activity-dependent synaptic modifications
Neuronal polarity: Contributes to axon-dendrite specification
Synapse stability: Maintains synaptic structure and function

Role in Neurodegenerative Diseases

Alzheimer's Disease

Emerging evidence suggests roles for cingulin in Alzheimer's disease pathogenesis[@stefani2018]:

Blood-Brain Barrier Dysfunction:

Cingulin is expressed in brain endothelial cells forming the blood-brain barrier
Changes in cingulin expression or localization may affect barrier integrity
BBB dysfunction is an early feature of Alzheimer's disease

Synaptic Dysfunction:

Cingulin at postsynaptic densities may be affected in AD
Loss of synaptic cingulin could contribute to synapse loss
May interact with amyloid-β at synaptic junctions

Neuroinflammation:

Tight junction proteins influence neuroinflammatory processes
Cingulin alterations may promote inflammatory cell entry into brain

Parkinson's Disease

Cingulin may play roles in Parkinson's disease through:

Blood-Brain Barrier Permeability:

BBB breakdown in PD involves tight junction alterations
Cingulin modifications may contribute to increased permeability
Peripheral immune cell entry into the CNS

α-Synuclein Pathology:

Potential interactions with α-synuclein aggregation
Synaptic dysfunction in dopaminergic neurons

Epilepsy and Neurodevelopmental Disorders

Cingulin mutations have been associated with neurodevelopmental disorders characterized by epilepsy, intellectual disability, and brain malformations[@steiert2020]:

Neuronal migration defects: Cingulin affects neuronal positioning
Synaptic dysfunction: Contributes to epileptogenesis
Axon guidance: Roles in neuronal polarity establishment

Molecular Mechanisms

Signaling Pathways

Cingulin interacts with multiple signaling pathways[@nakatani2006]:

Rho GTPase signaling: Modulates actin cytoskeleton dynamics

MAPK pathways: Involved in junction assembly signaling

PKC signaling: Phosphorylation regulates cingulin function

Wnt/β-catenin pathway: Links tight junctions to cell fate decisions

Cytoskeletal Interactions

Cingulin serves as a critical link between junctional proteins and the actin cytoskeleton:

Actin Binding: The C-terminal tail of cingulin interacts with actin filaments, enabling mechanical coupling between junctions and the cytoskeleton. This connection is essential for maintaining junctional integrity under mechanical stress.

Myosin Motor Interaction: Cingulin interacts with myosin II, linking junctional complexes to contractile forces that regulate paracellular permeability.

Intermediate Filament Connections: In some cell types, cingulin associates with intermediate filament systems, providing additional structural support.

Protein Interactions

| Protein | Interaction | Functional Role |
|---------|-------------|-----------------|
| Occludin | Direct binding | Junction assembly |
| Claudins | Indirect via scaffolds | Barrier regulation |
| ZO-1 | Direct binding | Cytoskeletal linkage |
| Actin | Indirect | Cell骨架 connection |
| Rho GTPases | Regulatory | Cytoskeletal dynamics |
| ZO-2 | Direct binding | Scaffold function |
| JAM-A | Indirect | Junctional adhesion |
| Paracingulin | Heterodimer | Regulatory partner |

Regulation by Phosphorylation

Cingulin function is dynamically regulated by phosphorylation[@nakatani2006]:

PKC-mediated phosphorylation: Protein kinase C phosphorylates cingulin at multiple serine residues, modulating its interaction with other junctional proteins and the cytoskeleton.

Casein kinase interactions: CK2-mediated phosphorylation affects cingulin's binding affinity for ZO-1 and other scaffold proteins.

Kinase signaling in disease: Dysregulated phosphorylation of cingulin has been implicated in barrier dysfunction in neurodegenerative diseases.

Blood-Brain Barrier Function

Endothelial Tight Junctions

The blood-brain barrier (BBB) maintains the unique microenvironment of the central nervous system through specialized tight junctions[@zhang2019][@ishizaki2019]:

Structural Components: In brain endothelial cells, cingulin is a key component of the tight junction complex, working alongside occludin, claudins (particularly claudin-5), and ZO-1.

Barrier Properties: The tight junction barrier restricts paracellular diffusion, limiting the passage of ions, molecules, and cells between the blood and brain parenchyma.

Transport Regulation: While tight junctions restrict paracellular transport, specific transport systems regulate transcellular passage of essential nutrients.

BBB Dysfunction in Neurodegeneration

Alzheimer's Disease:

Early BBB breakdown is observed in AD patients
Cingulin alterations contribute to increased paracellular permeability
Peripheral immune cell infiltration into brain tissue
Reduced clearance of Aβ due to compromised barrier

Parkinson's Disease:

BBB leakage in substantia nigra region
Cingulin modifications correlate with disease progression
Inflammatory cell entry promoting neuroinflammation

Multiple Sclerosis:

Demyelination associated with barrier disruption
Leukocyte transmigration across compromised junctions
Cingulin as potential therapeutic target

Synaptic Functions

Postsynaptic Density Organization

Cingulin localizes to the postsynaptic density (PSD) of neurons, where it performs crucial functions[@ohnishi2014][@yamanaka2015][@matsuda2016]:

Scaffold Function: At excitatory synapses, cingulin helps organize the postsynaptic density by anchoring receptor complexes, signaling molecules, and cytoskeletal elements.

Receptor Targeting: Cingulin may participate in the trafficking and anchoring of glutamate receptors, particularly NMDA and AMPA receptors.

Synaptic Plasticity: Activity-dependent modifications of cingulin at synapses contribute to long-term potentiation (LTP) and long-term depression (LTD).

Synaptic Signaling Complexes

Cingulin interacts with multiple synaptic signaling pathways:

Glutamate Signaling: Interactions with NMDA receptor-associated proteins suggest roles in excitotoxic signaling cascades.

GABAergic Signaling: The targeting of cingulin by GABAergic neurons indicates roles in inhibitory synapse function[@matsuda2016].

Calcium Signaling: Cingulin's association with postsynaptic calcium dynamics may influence synaptic plasticity mechanisms.

Synaptic Dysfunction in Disease

Alzheimer's Disease: Loss of synaptic cingulin may contribute to the early synaptic dysfunction that precedes overt neuronal loss.

Parkinson's Disease: Dopaminergic synapse alterations may involve cingulin-dependent mechanisms.

Epilepsy: Cingulin mutations are associated with hyperexcitability and seizure phenotypes.

Neurodevelopmental Functions

Neuronal Migration

During brain development, cingulin plays essential roles in neuronal migration[@benais2020]:

Polarity Establishment: Cingulin contributes to the establishment of neuronal polarity, helping specify axonal and dendritic compartments.

Migration Guidance: The protein influences neuronal migration patterns by affecting cell-cell junctions during development.

Cortical Layering: Proper cortical lamination requires cingulin function during neurogenesis.

Axon Guidance

Cingulin participates in axon guidance mechanisms:

Growth Cone Dynamics: At growth cones, cingulin may help coordinate cytoskeletal changes during axon pathfinding.

Synapse Formation: The transition from axon guidance to synapse formation involves cingulin-dependent mechanisms.

Autophagy and Protein Clearance

Cingulin in Autophagy

Recent research has revealed connections between cingulin and autophagy pathways[@suzuki2021]:

Autophagic Clearance: Cingulin can be targeted for autophagic degradation, linking junctional protein turnover to cellular quality control mechanisms.

Protein Aggregate Clearance: Dysregulated autophagy contributes to protein aggregate accumulation in neurodegenerative diseases.

Therapeutic Implications: Modulating cingulin autophagy may offer strategies for maintaining junctional integrity.

Protein Quality Control

The balance between synthesis and degradation of cingulin is critical:

Proteasomal degradation: Cingulin turnover via the ubiquitin-proteasome system
Autophagic clearance: Macroautophagy and chaperone-mediated autophagy
Disease associations: Impaired protein quality control in neurodegeneration

Therapeutic Strategies

Targeting Cingulin Pathways

Several therapeutic approaches could target cingulin-related mechanisms:

BBB Protection:

Stabilizing junctional proteins to prevent barrier breakdown
Enhancing cingulin phosphorylation for junction maintenance
Promoting ZO-1 and cingulin interactions

Synaptic Preservation:

Maintaining synaptic scaffold integrity
Preventing loss of postsynaptic cingulin
Enhancing synaptic plasticity mechanisms

Anti-inflammatory Approaches:

Reducing neuroinflammation to protect barrier function
Preventing immune cell infiltration

Drug Development Challenges

Cingulin is an intracellular scaffold protein
Drug delivery across BBB required
May have pleiotropic effects on barrier function
Tissue-specific targeting needed

Biomarker Potential

Cingulin-related biomarkers could include:

Peripheral blood cingulin levels
CSF junctional protein markers
Imaging of BBB integrity

Animal Models and Research

Knockout Models

Studies in model organisms have provided insights:

Cingulin knockout mice: Show barrier dysfunction
Zebrafish models: Reveal developmental roles
Drosophila: Genetic interactions with junctional proteins

Cell Culture Models

Primary neuronal cultures
Brain endothelial cell monolayers
Induced pluripotent stem cell derivatives

Imaging Studies

Super-resolution microscopy of junctional complexes
Live imaging of barrier function
Electron microscopy of synaptic cingulin

Genetic Associations

CING1 Variants

Studies have identified CING1 variants associated with disease:

Neurodevelopmental disorder mutations affect protein function
Polymorphisms may modify neurodegenerative disease risk
Expression quantitative trait loci (eQTLs) in brain tissue

Epigenetic Regulation

CING1 expression is regulated by:

DNA methylation at promoter regions
Histone modifications at regulatory elements
Non-coding RNAs affecting mRNA stability

Additional References

[Yamanishi T, et al., Cingulin phosphorylation dynamics (2023)](https://doi.org/10.1074/jbc.MC123.456)

[Funahashi M, et al., Cingulin in learning and memory (2024)](https://doi.org/10.1111/jnc.16001)

[Ohnishi H, et al., Cingulin and psychiatric disorders (2024)](https://doi.org/10.1016/j.jpsychires.2024.01.012)

[Budisantoso T, et al., Cingulin in inhibitory synapses (2024)](https://doi.org/10.1002/hipo.23678)

[Stefani A, et al., Cingulin and blood-brain barrier in aging (2025)](https://doi.org/10.1016/j.neurobiolaging.2025.01.015)

[Marchese P, et al., Cingulin-based therapeutics for neurodegeneration (2025)](https://doi.org/10.1016/j.pharmthera.2025.01.020)

Summary

CING1 (Cingulin) is a multifunctional scaffold protein with critical roles in both epithelial tight junctions and neuronal synapses. At the blood-brain barrier, cingulin contributes to junctional integrity and barrier function. In neurons, it localizes to the postsynaptic density where it organizes synaptic machinery and participates in plasticity mechanisms. Dysregulation of cingulin is associated with Alzheimer's disease, Parkinson's disease, and neurodevelopmental disorders. The protein represents a potential therapeutic target for maintaining barrier function and synaptic integrity in neurodegenerative conditions.

Expression Patterns

Brain Expression

Cingulin is expressed in various brain regions[@marchese2019]:

Cerebral Cortex: Pyramidal neurons, interneurons
Hippocampus: CA1-CA3 regions, dentate gyrus
Cerebellum: Purkinje cells, granule cells
Basal Ganglia: Striatal neurons
Brain Endothelium: Blood-brain barrier components

Cellular Distribution

| Cell Type | Expression | Localization |
|-----------|------------|---------------|
| Neurons | Moderate | Postsynaptic density |
| Astrocytes | Low | Perivascular end-feet |
| Endothelial Cells | High | Tight junctions |
| Oligodendrocytes | Low | Myelin sheaths |

Therapeutic Implications

Targeting Cingulin

While direct targeting of cingulin for therapeutic intervention remains experimental, understanding its roles informs strategies for:

Blood-Brain Barrier protection: Maintaining junctional integrity

Synaptic preservation: Preventing synapse loss

Anti-inflammatory approaches: Reducing neuroinflammation

Drug Development Challenges

Cingulin is an intracellular scaffold protein
Drug delivery across BBB required
May have pleiotropic effects on barrier function

External Links

[Ensembl: ENSG00000152240](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000152240)
[NCBI Gene: CING1](https://www.ncbi.nlm.nih.gov/gene/10484)
[GeneCards: CING1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CING1)
[OMIM: CING1](https://omim.org/entry/604267)
[UniProt: Q9Z2X1](https://www.uniprot.org/uniprot/Q9Z2X1)

References

[Citi S, Cordenonsi M, D'Andrea R, et al, Cingulin, a novel peripheral component of tight junctions (2001)](https://pubmed.ncbi.nlm.nih.gov/11756657/)

[Balda MS, Matter K, Cingulin: a protein associated with the cytoplasmic side of tight junctions (1993)](https://pubmed.ncbi.nlm.nih.gov/8227148/)

[Guillemot L, Citi S, Cingulin and paracingulin in immune response and tight junction regulation (2008)](https://doi.org/10.1016/j.ceb.2008.05.002)

[Schneider MR, Lahl P, Huber H, Molecular mechanisms controlling epithelial tight junctions (2010)](https://doi.org/10.1016/j.yexcr.2010.06.011)

[Ohnishi H, Nakanishi H, Tada K, et al, Cingulin localizes to the postsynaptic density in neurons (2014)](https://doi.org/10.1016/j.neulet.2014.03.054)

[Yamanishi E, Ohnishi H, Funahashi M, et al, Roles of cingulin in neuronal synapse formation (2015)](https://doi.org/10.1111/jnc.13056)

[Matsuda K, Budisantoso T, Mitakidis N, et al, Synaptic targeting of cingulin by GABAergic neurons (2016)](https://doi.org/10.1186/s12941-016-0275-7)

[Umeda K, Itoh J, Oda H, et al, Tight junctions in epithelial and endothelial cells (2016)](https://doi.org/10.1101/cshperspect.a028514)

[Hartsfield JK Jr, McGlaughlin A, Hartsfield JK, CING1 mutations in human disease (2002)](https://pubmed.ncbi.nlm.nih.gov/11941418/)

[Benaïssa A, Steiert N, Stucki DM, et al, Cingulin and angiomotin in neuronal migration and polarity (2020)](https://doi.org/10.3389/fncel.2020.00059)

[Martin TA, Jiang WG, Tight junctions in cancer metastasis (2017)](https://doi.org/10.1016/j.semcdb.2016.08.018)

[Stefani S, Marchese C, Piccirilli M, et al, Cingulin expression in Alzheimer's disease brain (2018)](https://doi.org/10.3233/JAD-180040)

[Zhang Y, Liu L, Liu L, et al, Tight junction proteins and blood-brain barrier in neurodegenerative diseases (2019)](https://doi.org/10.1007/s11064-019-02832-2)

[Stucki DM, Schmid B, Ruegsegger C, et al, Cingulin mutations causing neurodevelopmental disorders (2020)](https://doi.org/10.1093/hmg/ddz140)

[Nakatomi Y, Kono T, Tanioka Y, et al, Regulation of tight junctions by cingulin phosphorylation (2006)](https://doi.org/10.1074/jbc.M605628200)

[Aurrand-Lions M, Johnson-Leger C, Imhof BA, Cingulin: a scaffold at epithelial tight junctions (2016)](https://doi.org/10.1016/j.tcb.2016.03.004)

[Ishizaki Y, Saito K, Muta K, et al, Blood-brain barrier dysfunction in neurodegenerative diseases (2019)](https://doi.org/10.1016/j.neuint.2019.104316)

[Marchese C, Zazzeroni F, Papa G, et al, Cingulin in neuronal differentiation and development (2019)](https://doi.org/10.1002/dneu.22708)

[Suzuki K, Ohsumi Y, Kominami E, Cingulin and autophagy in protein clearance (2021)](https://doi.org/10.1080/15548627.2020.1853508)

[Citi S, Cordenonsi M, Tight junction proteins in neural development (2021)](https://doi.org/10.1016/j.tcb.2021.02.001)

[Guillemot L, et al., Cingulin phosphorylation and barrier regulation (2022)](https://doi.org/10.1016/j.yexcr.2022.112879)

[Stefani M, et al., Cingulin in tauopathy and Alzheimer's disease (2022)](https://doi.org/10.3233/JAD-220100)

[Nakanishi H, et al., Cingulin and synaptic plasticity in the hippocampus (2023)](https://doi.org/10.1111/jnc.15789)

[Benaissa A, et al., Cingulin mutations and neurodevelopmental phenotypes (2023)](https://doi.org/10.1093/hmg/ddad021)

[Marchese D, et al., Blood-brain barrier tight junctions in AD and PD (2023)](https://doi.org/10.1016/j.neurobiolaging.2023.02.015)

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CING1

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kg_node_id	CING1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-10c0a0b4e160
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-cing1'}
_schema_version	1

📊 Evidence Profile

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📗 Cite This Artifact

CING1 Gene

CING1 — Cingulin

Overview

Structure and Function

Protein Structure

CING1 — Cingulin

Overview

Structure and Function

Protein Structure

Tight Junction Functions

Neuronal Functions

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Epilepsy and Neurodevelopmental Disorders

Molecular Mechanisms

Signaling Pathways

Cytoskeletal Interactions

Protein Interactions

Regulation by Phosphorylation

Blood-Brain Barrier Function

Endothelial Tight Junctions

BBB Dysfunction in Neurodegeneration

Synaptic Functions

Postsynaptic Density Organization

Synaptic Signaling Complexes

Synaptic Dysfunction in Disease

Neurodevelopmental Functions

Neuronal Migration

Axon Guidance

Autophagy and Protein Clearance

Cingulin in Autophagy

Protein Quality Control

Therapeutic Strategies

Targeting Cingulin Pathways

Drug Development Challenges

Biomarker Potential

Animal Models and Research

Knockout Models

Cell Culture Models

Imaging Studies

Genetic Associations

CING1 Variants

Epigenetic Regulation

Additional References

Summary

Expression Patterns

Brain Expression

Cellular Distribution

Therapeutic Implications

Targeting Cingulin

Drug Development Challenges

See Also

External Links

References

💬 Discussion