GO:0045171 intercellular bridge: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045171 intercellular bridge is a cellular component defined as a direct cytoplasmic connection between two cells formed after cleavage furrow ingression during cell division.
• Intercellular bridges are transient in most somatic cells but can be stabilized, as seen between germ cells during development.
• Key structural components include microtubules, actin, and proteins such as KIF2A, which stabilizes bridge microtubules in embryonic stem cells.
• Intercellular bridges mediate intercellular communication, including Ca2+ signaling via IP3 and Ca2+ diffusion.
• They are essential for germ cell development, transposon repression, and meiosis in the male germline.
• Dysregulation of intercellular bridges is linked to viral transmission, such as chikungunya virus, and plant plasmodesmata share analogous functions.
Description
Intercellular bridges (GO:0045171) are direct cytoplasmic connections between two cells that form following the completion of cleavage furrow ingression during cell division. These structures are typically transient in somatic cells but become stabilized in certain contexts, such as between germ cells during their development. The study of intercellular bridges is crucial for understanding cell-cell communication, cytokinesis, and developmental processes. They facilitate the exchange of ions, small molecules, and even pathogens between connected cells. In recent years, research has expanded to include their roles in embryonic stem cell cytokinesis, germline development, and evolutionary conservation across species. Understanding the molecular composition and regulation of intercellular bridges provides insights into fundamental cellular mechanisms and potential therapeutic targets.
intercellular bridge At A Glance
| GO ID | GO:0045171 |
|---|---|
| GO term | intercellular bridge |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Direct cytoplasmic connection between two cells; facilitates intercellular communication and material exchange. |
| Formation | Forms after cleavage furrow ingression during cell division. |
| Stability | Usually transient; stabilized in germ cells and certain developmental contexts. |
| Key components | Microtubules, actin, KIF2A, and other cytoskeletal and signaling proteins. |
| Evolutionary conservation | Present in diverse organisms from Hydra to mammals. |
What Is GO:0045171?
The intercellular bridge is a cellular component defined by the Gene Ontology as a direct connection between the cytoplasm of two cells that is formed following the completion of cleavage furrow ingression during cell division. These bridges are usually present only briefly prior to the completion of cytokinesis, but in some cases, such as between germ cells during their development, they become stabilized.
Why Is intercellular bridge Important in Cell Biology?
Intercellular bridges are important because they serve as conduits for intercellular communication and are essential for various physiological processes, including germ cell development, cytokinesis, and embryonic stem cell maintenance. They also play a role in the transmission of pathogens such as chikungunya virus and are evolutionarily conserved structures that provide insights into fundamental cell biology.
• Facilitate direct cytoplasmic exchange between cells, including ions and small molecules.
• Essential for germ cell development and meiosis in the male germline.
• Stabilized bridges between germ cells are critical for fertility.
• Involved in transposon repression and genomic stability in germ cells.
• Mediate Ca2+ signaling between micropatterned cells.
• Serve as a route for viral transmission, e.g., chikungunya virus.
• Provide insights into cytokinesis and embryonic stem cell biology.
• Evolutionarily conserved from Hydra to mammals, aiding comparative studies.
• Analogous to plant plasmodesmata, highlighting universal cell-cell communication mechanisms.
• Potential targets for understanding developmental disorders and cancer.
What Happens During intercellular bridge?
Formation after cleavage furrow ingression
In simple terms: After a cell divides, a tiny tube-like connection remains between the two new cells.
Intercellular bridges form following the completion of cleavage furrow ingression during cell division. This process leaves a direct cytoplasmic connection between the two daughter cells, which is usually transient but can be stabilized in certain contexts.
Stabilization in germ cells
In simple terms: In germ cells, these bridges don't break; they stay open to allow communication.
In some cases, such as between germ cells during their development, intercellular bridges become stabilized. These stable bridges are essential for germ cell development and meiosis, allowing sharing of cytoplasmic components and signaling molecules.
Intercellular communication via Ca2+ and IP3
In simple terms: Cells connected by bridges can send signals like calcium waves to each other.
Intercellular bridges mediate Ca2+ signals between micropatterned cells via IP3 and Ca2+ diffusion. This allows coordinated responses between connected cells, highlighting their role in intercellular signaling.
Role in viral transmission
In simple terms: Some viruses can use these bridges to spread directly from one cell to another.
Intercellular bridges can serve as a route for viral transmission, as shown for chikungunya virus. This highlights their potential role in pathogen spread and disease progression.
Key Genes Involved in GO:0045171 intercellular bridge
Key genes and proteins involved in intercellular bridge formation, stabilization, and function include cytoskeletal components and regulatory factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KIF2A | Stabilizes intercellular bridge microtubules | Maintains mouse embryonic stem cell cytokinesis |
| Actin | Cytoskeletal component of the bridge | Structural support and dynamics |
| Microtubules | Core structural element of the bridge | Essential for bridge stability and function |
| IP3 receptor | Mediates Ca2+ signaling through the bridge | Intercellular communication |
| Connexins | Form gap junctions possibly associated with bridges | Cell-cell communication |
| TEX14 | Germ cell intercellular bridge component | Essential for fertility and meiosis |
| KIF23 | Kinesin involved in cytokinesis | Bridge formation and abscission |
| RACGAP1 | Rho GTPase activating protein | Regulates cytokinesis and bridge stability |
| ANLN | Actin-binding protein in cytokinesis | Bridge assembly |
| ECT2 | Rho exchange factor | Cytokinesis regulation |
| PLK1 | Polo-like kinase 1 | Cell cycle regulation of bridge |
| Aurora B | Chromosomal passenger complex kinase | Regulates abscission timing |
| ESCRT-III | Membrane scission machinery | Bridge abscission |
| CHMP4B | ESCRT-III component | Bridge severing |
| Spastin | Microtubule severing enzyme | Bridge disassembly |
| Formins | Actin nucleation factors | Bridge actin dynamics |
| RhoA | GTPase regulating cytokinesis | Bridge formation |
How Is intercellular bridge Regulated?
Intercellular bridge formation and stability are regulated by cell cycle kinases such as PLK1 and Aurora B, as well as by kinesins like KIF2A that stabilize microtubules. In germ cells, stabilization is developmentally regulated and involves specific proteins like TEX14. Additionally, intercellular bridges can be regulated by signaling molecules such as Ca2+ and IP3, which diffuse through the bridge and modulate cellular responses.
intercellular bridge and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KIF2A | Cytokinesis defects, cancer | Knockout in embryonic stem cells |
| TEX14 | Infertility, germ cell defects | Knockout mouse model |
| CHMP4B | Neurodegeneration, cytokinesis failure | Point mutation knock-in |
| Spastin | Hereditary spastic paraplegia | Overexpression and knockout |
| PLK1 | Cancer, cell cycle dysregulation | Knockdown and inhibitor studies |
Intercellular bridges and viral transmission
Intercellular bridges can facilitate the direct cell-to-cell transmission of viruses, such as chikungunya virus, potentially contributing to viral spread and pathogenesis.
Germ cell defects and infertility
Disruption of intercellular bridges in germ cells leads to defects in meiosis and transposon repression, which can result in infertility and germline instability.
Cancer and cytokinesis failure
Aberrant intercellular bridge formation or stability can lead to cytokinesis failure, which is associated with aneuploidy and cancer development.
From intercellular bridge-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of KIF2A in bridge stability? | KIF2A knockout embryonic stem cells |
| How do germ cell bridges prevent transposon jumping? | TEX14 knockout mouse |
| Can intercellular bridges transmit viral particles? | Chikungunya virus infection model |
| What is the evolutionary conservation of bridge formation? | Hydra vulgaris model |
| How do Ca2+ signals propagate through bridges? | Micropatterned cell culture with IP3 receptor knockout |
| What is the function of ESCRT-III in abscission? | CHMP4B point mutation knock-in |
How to Study the intercellular bridge Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Dynamics of bridge formation and abscission | Visualizing KIF2A localization |
| Electron microscopy | Ultrastructure of intercellular bridges | Germ cell bridge morphology |
| CRISPR knockout | Gene function in bridge stability | KIF2A knockout in ES cells |
| Calcium imaging | Ca2+ signal propagation | IP3-mediated communication |
| RNA-seq | Transcriptional changes upon bridge disruption | Germ cell development |
| Proteomics | Protein composition of bridges | Identification of novel components |
| Viral infection assays | Pathogen transmission through bridges | Chikungunya virus spread |
Live-cell imaging
Live-cell imaging allows visualization of intercellular bridge formation, stabilization, and abscission in real time, often using fluorescently tagged cytoskeletal proteins.
Electron microscopy
Electron microscopy provides ultrastructural details of intercellular bridges, revealing their cytoplasmic continuity and associated structures.
Genetic knockout and knockdown
Knockout or knockdown of genes such as KIF2A or TEX14 in cell lines or animal models helps determine their roles in bridge formation and function.
Calcium imaging
Calcium imaging using fluorescent indicators can measure Ca2+ signals transmitted through intercellular bridges, as demonstrated in micropatterned cells.
How CRISPR Can Be Used to Study GO:0045171 intercellular bridge
Knockout
CRISPR knockout of genes like KIF2A or TEX14 can reveal their essential roles in intercellular bridge formation and stability, as shown in embryonic stem cells and germ cells.
Point Mutation
Introducing point mutations in genes such as CHMP4B can model human diseases associated with bridge abscission defects and study their molecular consequences.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into bridge component genes allows real-time visualization of bridge dynamics in live cells.
Overexpression
Overexpression of bridge-stabilizing proteins like KIF2A can lead to persistent bridges and cytokinesis defects, providing insights into regulatory mechanisms.
How EDITGENE Supports intercellular bridge Research
Researchers studying intercellular bridge-related genes often need to determine whether a candidate gene is causally involved in bridge formation, stabilization, or function. EDITGENE provides comprehensive CRISPR-based services to create precise cellular and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for intercellular bridge research.
Frequently Asked Questions About intercellular bridge
What is an intercellular bridge?
An intercellular bridge is a direct cytoplasmic connection between two cells formed after cleavage furrow ingression during cell division, often transient but stabilized in germ cells.
What genes are involved in intercellular bridge formation?
Key genes include KIF2A, TEX14, CHMP4B, PLK1, and others involved in cytokinesis and cytoskeletal regulation.
How are intercellular bridges studied?
They are studied using live-cell imaging, electron microscopy, CRISPR knockout models, and calcium imaging.
What is the role of intercellular bridges in development?
They are essential for germ cell development, meiosis, and transposon repression, and they facilitate intercellular communication.
Can viruses use intercellular bridges to spread?
Yes, chikungunya virus can transmit through intercellular bridges, highlighting their role in viral pathogenesis.
What diseases are associated with intercellular bridge defects?
Defects can lead to infertility, cytokinesis failure, aneuploidy, and cancer, as well as neurodegenerative diseases like hereditary spastic paraplegia.
How does KIF2A function in intercellular bridges?
KIF2A stabilizes intercellular bridge microtubules to maintain cytokinesis in mouse embryonic stem cells.
What is the evolutionary significance of intercellular bridges?
They are evolutionarily conserved from Hydra to mammals, providing insights into fundamental cell-cell communication mechanisms.
What methods are used to visualize intercellular bridges?
Live-cell imaging with fluorescently tagged proteins and electron microscopy are commonly used.
How can CRISPR help study intercellular bridges?
CRISPR knockout, knock-in, and overexpression models allow precise manipulation of bridge-related genes to study their functions and disease relevance.
Conclusion
Intercellular bridges (GO:0045171) are dynamic cytoplasmic connections essential for cell-cell communication, germ cell development, and cytokinesis. Their study spans multiple disciplines, from developmental biology to virology and cancer research. Understanding their molecular composition and regulation offers insights into fundamental cellular processes and potential therapeutic targets.
References
- 1. Du Toit A. 2023. An intercellular bridge for chikungunya virus transmission.. Nat Rev Microbiol 21(11):702 PMID: 37667008
- 2. Xing F et al.. 2020. Intercellular Bridge Mediates Ca(2+) Signals between Micropatterned Cells via IP(3) and Ca(2+) Diffusion.. Biophys J 118(5):1196-1204 PMID: 32023438
- 3. Stockmann L et al.. 2025. KIF2A stabilizes intercellular bridge microtubules to maintain mouse embryonic stem cell cytokinesis.. J Cell Biol 224(7) PMID: 40353778
- 4. Price KL et al.. 2025. Examination of Germline and Somatic Intercellular Bridges in Hydra vulgaris Reveals Insights into the Evolutionarily Conserved Mechanism of Intercellular Bridge Formation.. Mol Biol Evol 42(11) PMID: 41032677
- 5. FAWCETT DW. 1961. Intercellular bridges.. Exp Cell Res Suppl 8:174-87 PMID: 13698424
- 6. Greenbaum MP et al.. 2011. Germ cell intercellular bridges.. Cold Spring Harb Perspect Biol 3(8):a005850 PMID: 21669984
- 7. Sorkin J et al.. 2025. Intercellular bridges are essential for transposon repression and meiosis in the male germline.. Nat Commun 16(1):1488 PMID: 39929837
- 8. Bayer EM et al.. 2024. Plasmodesmata: Channels Under Pressure.. Annu Rev Plant Biol 75(1):291-317 PMID: 38424063
