GO:0045217 cell-cell junction maintenance: Barrier Integrity, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045217 (cell-cell junction maintenance) is the biological process that preserves the structure and function of junctions between cells over time, ensuring tissue integrity and barrier function.
• Tight junctions, adherens junctions, desmosomes and gap junctions are the main junction types whose maintenance is covered by this term.
• Maintenance requires continuous protein turnover, cytoskeletal coupling, polarity cues and mechanotransduction, not just de novo assembly.
• Loss of junction maintenance drives skin barrier defects, epithelial cancers, lung progenitor dysfunction and other diseases.
• Key research genes include CLDN1, OCLN, CDH1, CTNNB1, JUP, GJA1, TJP1, PARD3, PRKCI and PIEZO1.
• CRISPR knockout, point-mutation, knock-in and overexpression models enable causal testing of junction maintenance genes in relevant cell types.
Description
Cell-cell junction maintenance (GO:0045217) is the biological process that preserves the structure and function of junctions between cells, as defined by the Gene Ontology. This process is essential for tissue integrity, barrier function and coordinated cell behavior in epithelia, endothelia and other junction-rich tissues. Unlike initial junction assembly, maintenance operates continuously throughout cell turnover and must balance junctional protein stability with dynamic remodeling. Disruption of junction maintenance is linked to skin diseases, cancer progression and organ dysfunction, making it a central topic in cell biology and translational research. Understanding the molecular players and regulatory mechanisms of GO:0045217 is therefore critical for researchers studying epithelial biology, disease mechanisms and therapeutic targets.
cell-cell junction maintenance At A Glance
| GO ID | GO:0045217 |
|---|---|
| GO term | cell-cell junction maintenance |
| Ontology | biological_process |
| Synonym | intercellular junction maintenance |
| Definition | The maintenance of junctions between cells. |
| Major function | Preservation of intercellular junction structure and barrier function over time |
| Related junction types | Tight junctions, adherens junctions, desmosomes, gap junctions |
| Key cellular context | Epithelia, endothelia and other junction-rich tissues |
| Disease relevance | Skin barrier disorders, cancer, lung progenitor dysfunction, tissue inflammation |
What Is GO:0045217?
GO:0045217 (cell-cell junction maintenance) is the biological process that ensures junctions between cells are kept functional over time. It encompasses the ongoing stabilization, repair and regulated remodeling of intercellular junctions, including tight junctions, adherens junctions, desmosomes and gap junctions, so that cell-cell adhesion and barrier properties are preserved despite cell turnover, mechanical stress and signaling changes.
Why Is cell-cell junction maintenance Important in Cell Biology?
Cell-cell junction maintenance is fundamental because it sustains tissue barriers and adhesion throughout an organism's life, and its failure contributes to diseases ranging from skin disorders to cancer. Because junctions are dynamic and must be maintained during cell turnover, understanding GO:0045217 provides insight into how tissues preserve homeostasis and how pathological states arise when maintenance fails.
• Maintains epithelial and endothelial barrier function during continuous cell turnover.
• Prevents loss of tissue integrity under mechanical stress via mechanotransduction.
• Supports cell polarity and differentiated function in hepatocytes and other polarized cells.
• Enables coordinated gap-junction-mediated cell-to-cell communication.
• Protects against skin barrier defects and inflammatory skin diseases.
• Contributes to lung progenitor cell shape and apical junction stability.
• Dysregulation is implicated in cancer progression and metastasis.
• Provides targets for therapeutic modulation of barrier function.
• Serves as a model for studying protein turnover at specialized membrane domains.
• Links cytoskeletal dynamics to junctional stability.
What Happens During cell-cell junction maintenance?
Continuous junctional protein turnover and repair
In simple terms: Junction proteins are constantly replaced and repaired to keep junctions working.
Maintenance of cell-cell junctions requires ongoing synthesis, delivery and degradation of junctional components such as claudins, occludin and cadherins. This turnover allows junctions to recover from wear and to adapt to changing physiological demands without losing barrier function.
Cytoskeletal coupling and mechanotransduction
In simple terms: The cytoskeleton pulls on junctions, and cells sense this force to keep junctions stable.
Junctions are linked to actin and intermediate filament networks, and mechanical forces are sensed by proteins such as PIEZO1, which balances membrane and cortex tension to stabilize intercellular junctions. This mechanotransduction is essential for maintaining epithelial barrier integrity under mechanical stress.
Polarity complex-dependent stabilization
In simple terms: Polarity proteins tell cells which side is which, helping junctions stay in the right place.
Polarity complex proteins, including PAR and CRB complexes, are required for maintaining apical junctions and hepatocyte polarity. Their activity ensures that junctional domains are correctly positioned and retained during cell turnover.
Signaling-dependent remodeling
In simple terms: Signals from growth factor pathways help junctions adjust without falling apart.
Receptor tyrosine kinase (RTK) signaling promotes epithelial columnar cell shape and apical junction maintenance in human lung progenitor cells. This illustrates how maintenance is not passive but actively regulated by signaling pathways that coordinate junction stability with cell shape and proliferation.
Gap junction maintenance for communication
In simple terms: Gap junctions must be kept open so cells can talk to each other.
Gap-junction-mediated cell-to-cell communication depends on the maintenance of gap junction plaques composed of connexins. Disruption of this maintenance impairs coordinated tissue responses.
Key Genes Involved in GO:0045217 cell-cell junction maintenance
The following genes encode proteins with well-documented roles in maintaining cell-cell junctions across epithelial, endothelial and other tissues.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CLDN1 | Tight junction barrier protein | Skin barrier and epithelial tight junction maintenance |
| OCLN | Tight junction component | Tight junction integrity during cell turnover |
| TJP1 | Tight junction scaffold protein | Links tight junctions to cytoskeleton |
| CDH1 | Adherens junction cadherin | Epithelial adhesion and junction maintenance |
| CTNNB1 | Adherens junction and signaling | Junction stability and Wnt signaling |
| JUP | Desmosome and adherens junction protein | Junction maintenance in skin and heart |
| GJA1 | Gap junction connexin | Gap-junction-mediated communication |
| PARD3 | Polarity complex protein | Apical junction maintenance and polarity |
| PRKCI | Polarity kinase | Polarity-dependent junction stabilization |
| PIEZO1 | Mechanosensitive ion channel | Mechanotransduction at junctions |
| CDH2 | Adherens junction cadherin | Junction maintenance in non-epithelial cells |
| DSG3 | Desmosomal cadherin | Desmosome maintenance in skin |
| DSP | Desmosomal plaque protein | Desmosome stability |
| VCL | Focal adhesion and junction protein | Cytoskeletal coupling at junctions |
| ACTN1 | Actin crosslinker | Actin cytoskeleton support at junctions |
| MYH9 | Non-muscle myosin | Cortical tension and junction stability |
| RAB13 | Vesicle trafficking regulator | Junctional protein delivery |
How Is cell-cell junction maintenance Regulated?
Cell-cell junction maintenance is regulated by signaling pathways including RTK signaling, which promotes apical junction maintenance in lung progenitor cells, and by mechanotransduction through PIEZO1, which balances membrane and cortex tension to stabilize junctions. Polarity complexes also provide spatial cues that direct junctional protein delivery and retention. Additionally, junctional protein turnover is controlled by vesicle trafficking and degradation pathways that ensure continuous renewal of junction components.
cell-cell junction maintenance and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CLDN1 | Skin barrier defects | Keratinocyte knockout |
| CDH1 | Cancer metastasis | Epithelial cancer cell line knockout |
| GJA1 | Gap junction communication disorders | Connexin knockout in fibroblasts |
| PIEZO1 | Mechanotransduction-related barrier dysfunction | Epithelial cell knockout |
| PARD3 | Polarity and junction maintenance defects | Polarized epithelial knockout |
Skin barrier disorders
The skin barrier depends on tight junction and desmosome maintenance; defects in these processes contribute to inflammatory skin diseases and impaired barrier function. Maintenance of tight junction barrier integrity is particularly important during epidermal cell turnover.
Cancer progression
Loss of cell-cell junction maintenance can promote epithelial-to-mesenchymal transition and metastasis, as junctional adhesion must be overcome for cells to invade. RTK signaling that maintains junctions in normal lung progenitors may be dysregulated in cancer.
Lung progenitor dysfunction
In human lung progenitor cells, RTK signaling promotes epithelial columnar cell shape and apical junction maintenance; disruption of this process may impair lung repair.
Tissue inflammation and edema
Failure to maintain endothelial and epithelial junctions increases permeability, contributing to inflammation and edema in various tissues. Mechanotransduction defects can further destabilize junctions under mechanical stress.
From cell-cell junction maintenance-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a junction gene disrupt barrier function? | CRISPR knockout in epithelial cells |
| Does a point mutation in a junction protein alter stability? | CRISPR point mutation knock-in |
| How does a tagged junction protein localize dynamically? | Knock-in of fluorescent tag |
| Does overexpression of a junction gene enhance barrier? | Overexpression cell model |
| Which genes are essential for junction maintenance? | CRISPR library screening |
| How does mechanotransduction affect junction maintenance? | PIEZO1 knockout or point mutant |
How to Study the cell-cell junction maintenance Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Immunofluorescence | Junction protein localization | Assessing junction maintenance |
| TEER | Barrier function | Epithelial monolayer integrity |
| Live-cell imaging | Junction dynamics | Protein turnover at junctions |
| RNA-seq | Gene expression changes | Identifying maintenance regulators |
| Proteomics | Protein abundance and interactions | Junction protein stability |
| Traction force microscopy | Mechanical forces at junctions | Mechanotransduction studies |
| CRISPR screening | Essential genes for maintenance | Functional genomics |
Imaging-based assessment of junction integrity
Immunofluorescence and live-cell imaging of tight junction and adherens junction markers allow direct visualization of junction maintenance over time. These methods are used to quantify junction continuity and protein turnover.
Barrier function assays
Transepithelial electrical resistance (TEER) and tracer permeability assays measure the functional outcome of junction maintenance in epithelial monolayers. They are standard for assessing barrier integrity after genetic manipulation.
Proteomic and transcriptomic profiling
RNA-seq and proteomics can identify changes in junctional gene expression and protein abundance during maintenance or after perturbation. These approaches reveal regulatory networks controlling GO:0045217.
Mechanotransduction measurements
Traction force microscopy and membrane tension measurements assess how mechanical forces influence junction stability, particularly in PIEZO1 studies. Such methods link physical cues to junction maintenance.
How CRISPR Can Be Used to Study GO:0045217 cell-cell junction maintenance
Knockout
CRISPR knockout of junctional genes such as CLDN1 or CDH1 in epithelial cells reveals their requirement for maintaining barrier function and junction integrity. Knockout models are used to test causality in disease-relevant contexts.
Point Mutation
Point mutations introduced by CRISPR can mimic disease-associated variants in junction proteins, allowing assessment of their impact on maintenance without complete loss of function. This is valuable for studying subtle defects in mechanotransduction or adhesion.
Knock-in
Knock-in of fluorescent or epitope tags enables real-time tracking of junctional proteins and their turnover during maintenance. Tagged knock-in models are used in live-cell imaging studies.
Overexpression
Overexpression of junctional proteins can enhance barrier function or rescue maintenance defects, providing gain-of-function evidence. Such models help define sufficiency of a gene for junction maintenance.
How EDITGENE Supports cell-cell junction maintenance Research
Researchers studying cell-cell junction maintenance-related genes often need to determine whether a candidate gene is causally involved in preserving junction structure and function. This requires precise genetic models that can knockout, mutate, tag or overexpress the gene of interest in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for cell-cell junction maintenance research.
Frequently Asked Questions About cell-cell junction maintenance
What is cell-cell junction maintenance (GO:0045217)?
It is the biological process that keeps junctions between cells functional over time, preserving tissue integrity and barrier function.
What genes are involved in cell-cell junction maintenance?
Key genes include CLDN1, OCLN, CDH1, CTNNB1, JUP, GJA1, TJP1, PARD3, PRKCI and PIEZO1.
Why is cell-cell junction maintenance important?
It maintains tissue barriers and adhesion during cell turnover, and its failure contributes to skin diseases, cancer and organ dysfunction.
How is cell-cell junction maintenance regulated?
It is regulated by RTK signaling, polarity complexes and mechanotransduction via PIEZO1.
What diseases are linked to defective cell-cell junction maintenance?
Skin barrier disorders, cancer progression, lung progenitor dysfunction and tissue inflammation.
What methods study cell-cell junction maintenance?
Immunofluorescence, TEER, live-cell imaging, RNA-seq, proteomics and CRISPR screening.
What is the role of tight junctions in maintenance?
Tight junctions form the primary barrier and must be continuously maintained during cell turnover.
How do gap junctions contribute to maintenance?
Gap junctions enable cell-to-cell communication and their plaques require maintenance for coordinated tissue function.
Can CRISPR be used to study junction maintenance?
Yes, CRISPR knockout, point mutation, knock-in and overexpression models are widely used to test gene function in junction maintenance.
What is the GO definition of cell-cell junction maintenance?
The maintenance of junctions between cells, synonym intercellular junction maintenance.
Conclusion
GO:0045217 (cell-cell junction maintenance) is a fundamental biological process that preserves intercellular junctions and tissue barriers throughout life. Its molecular players, including tight junction, adherens junction, desmosome and gap junction proteins, are regulated by signaling, polarity and mechanotransduction pathways. Disruption of this process underlies multiple human diseases, making it a key area for CRISPR-based functional studies.
References
- 1. Proksch E et al.. 2008. The skin: an indispensable barrier.. Exp Dermatol 17(12):1063-72 PMID: 19043850
- 2. Yokouchi M et al.. 2018. Maintenance of tight junction barrier integrity in cell turnover and skin diseases.. Exp Dermatol 27(8):876-883 PMID: 30019465
- 3. Hervé JC et al.. 2013. Gap-junction-mediated cell-to-cell communication.. Cell Tissue Res 352(1):21-31 PMID: 22940728
- 4. Balda MS et al.. 2023. Tight junctions.. Curr Biol 33(21):R1135-R1140 PMID: 37935122
- 5. Liu S et al.. 2023. RTK signalling promotes epithelial columnar cell shape and apical junction maintenance in human lung progenitor cells.. Development 150(11) PMID: 37260147
- 6. Treyer A et al.. 2013. Hepatocyte polarity.. Compr Physiol 3(1):243-87 PMID: 23720287
- 7. Assémat E et al.. 2008. Polarity complex proteins.. Biochim Biophys Acta 1778(3):614-30 PMID: 18005931
- 8. Javed A et al.. 2025. Piezo1 balances membrane and cortex tension to stabilize intercellular junctions and maintain the epithelial barrier.. J Cell Sci 138(16) PMID: 40741726
