GO:0071800 podosome assembly: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071800 podosome assembly describes the aggregation, arrangement and bonding of components into a podosome, an actin-rich adhesion structure that forms upon cell-substrate contact and localizes to the substrate-attached part of the cell.
• Podosome assembly is driven by actin polymerization and is controlled by forces and constraints that balance protrusion, adhesion and turnover.
• Small GTPases such as Cdc42 and ARF1, together with their regulators, are central to initiating podosome assembly.
• Kinases including FAK and adaptor proteins such as Sos1 regulate podosome rosette formation and invasive capacity.
• Calcium signaling through TRPV2 and actin-bundling proteins such as fascin and cortactin modulate podosome assembly and disassembly.
• Podosome assembly is relevant to cancer invasion, immune cell migration and vascular mechanobiology, making it a target for CRISPR-based functional studies.
Description
Podosomes are actin-rich adhesion structures that form when cells contact a substrate and localize to the substrate-attached part of the cell. The biological process that builds these structures is annotated as GO:0071800 podosome assembly, defined as the aggregation, arrangement and bonding together of a set of components to form a podosome. This process is essential for cells to probe and remodel their extracellular environment, and it underlies physiological events such as macrophage migration and endothelial responses to shear stress. Researchers study podosome assembly to understand how cells integrate adhesion, actin dynamics and signaling to drive invasion and matrix degradation. Because podosomes are transient and force-sensitive, their assembly is tightly controlled by mechanical and biochemical cues. Key regulators include the GTPases Cdc42 and ARF1, kinases such as FAK, and actin-binding proteins like cortactin and fascin. Dysregulation of podosome assembly is linked to cancer cell invasion and immune dysfunction, making it a compelling area for functional genomics and CRISPR screening.
podosome assembly At A Glance
| GO ID | GO:0071800 |
|---|---|
| GO term | podosome assembly |
| Ontology | biological_process |
| Synonym | none |
| Major function | Formation of an actin-rich adhesion structure at the cell-substrate contact site |
| Cellular context | Substrate-attached part of the cell, including macrophages, dendritic cells and endothelial cells |
| Key regulators | Cdc42, ARF1, FAK, Sos1, TRPV2, cortactin and fascin |
| Related process | Actin cytoskeleton organization and cell-matrix adhesion |
What Is GO:0071800?
GO:0071800 podosome assembly is the biological process in which a set of cellular components aggregates, arranges and bonds together to form a podosome, an actin-rich adhesion structure characterized by formation upon cell-substrate contact and localization at the substrate-attached part of the cell. In other words, it is the stepwise construction of a specialized adhesion organelle that depends on actin polymerization, membrane remodeling and signaling inputs.
Why Is podosome assembly Important in Cell Biology?
Podosome assembly is important because it provides a mechanism for cells to sense and remodel their physical environment, and it is a prerequisite for invasive migration in immune and cancer cells. Understanding this process helps explain how cells convert substrate contact into localized actin polymerization and matrix degradation, and it offers a tractable target for modulating invasion and immune cell function.
• Podosome assembly enables cells to form substrate-attached actin-rich adhesions that support migration and matrix remodeling.
• It is regulated by mechanical forces and constraints, linking cell mechanics to cytoskeletal organization.
• Cdc42 activation downstream of PI(3,4,5)P3 is required for macrophage podosome assembly.
• ARF1 and its exchange factor ARNO control podosome assembly, connecting membrane trafficking to adhesion.
• FAK is required for the assembly of podosome rosettes, a higher-order arrangement of podosomes.
• Sos1 regulates macrophage podosome assembly and invasive capacity, linking Ras signaling to adhesion.
• Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation, tying hemodynamics to vascular biology.
• TRPV2 translocation to the podosome regulates podosome assembly through calcium signaling.
• Fascin controls podosome turnover and disassembly, while cortactin participates in assembly via its SH3 domain.
• Dysregulated podosome assembly contributes to cancer cell invasion and immune cell dysfunction.
What Happens During podosome assembly?
Initiation at the substrate contact site
In simple terms: The cell first decides where to build a podosome, right where it touches the surface.
Podosome assembly begins upon cell-substrate contact, when signaling and adhesion receptors cluster at the substrate-attached part of the cell. This initiation step is influenced by forces and constraints that determine whether a podosome will form and where it will localize. PI(3,4,5)P3-mediated activation of Cdc42 is an early event that promotes macrophage podosome assembly.
Actin polymerization and core formation
In simple terms: The cell builds a dense bundle of actin filaments to form the podosome core.
Actin polymerization drives the formation of the podosome core, an actin-rich column that protrudes toward the substrate. Cortactin participates in podosome assembly through its SH3 domain, contributing to actin organization at the core. Fascin-mediated actin bundling controls podosome turnover and disassembly, balancing assembly with remodeling.
GTPase and kinase signaling
In simple terms: Small signaling switches and enzymes tell the cell when and where to assemble podosomes.
The GTPase ARF1 and its nucleotide exchange factor ARNO control podosome assembly, linking membrane trafficking to actin dynamics. FAK is required for the assembly of podosome rosettes, which are organized arrays of podosomes. Sos1 regulates macrophage podosome assembly and invasive capacity, connecting upstream signaling to adhesion.
Calcium and mechanotransduction inputs
In simple terms: Calcium signals and mechanical forces fine-tune podosome assembly.
Translocation of the calcium-permeable TRPV2 channel to the podosome regulates podosome assembly, implicating local calcium influx in the process. Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation, showing that mechanical cues can trigger assembly. Forces and constraints act as key controllers of podosome assembly and disassembly.
Turnover and disassembly
In simple terms: Podosomes are not permanent; they are taken apart and rebuilt as the cell moves.
Podosome assembly is balanced by disassembly, and fascin actin bundling controls podosome turnover and disassembly in THP-1 macrophages and dendritic cells. The interplay between assembly and disassembly determines the lifetime and function of podosomes.
Key Genes Involved in GO:0071800 podosome assembly
The following genes and proteins have been experimentally implicated in podosome assembly and its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDC42 | GTPase activated by PI(3,4,5)P3 to regulate macrophage podosome assembly | Target for studying initiation of podosome assembly in macrophages |
| ARF1 | GTPase controlling podosome assembly together with its exchange factor ARNO | Links membrane trafficking to podosome formation |
| ARNO | Nucleotide exchange factor for ARF1 that controls podosome assembly | Regulator of ARF1-dependent podosome assembly |
| PTK2 (FAK) | Required for assembly of podosome rosettes | Kinase target for rosette formation studies |
| SOS1 | Regulates macrophage podosome assembly and invasive capacity | Connects Ras signaling to podosome assembly |
| VEGFA | Up-regulated by impaired endothelial shear stress to induce podosome assembly | Mechanotransduction-linked regulator in endothelium |
| TRPV2 | Calcium-permeable channel that translocates to the podosome and regulates assembly | Calcium signaling regulator of podosome assembly |
| CTTN (cortactin) | Involved in podosome assembly via its SH3 domain | Actin-binding regulator of assembly |
| FSCN1 (fascin) | Actin bundling controls podosome turnover and disassembly | Regulator of podosome dynamics |
| PIK3CA | Produces PI(3,4,5)P3 that mediates Cdc42 activation for podosome assembly | Upstream lipid signaling component |
| PIK3CB | Contributes to PI(3,4,5)P3 production for Cdc42 activation | Lipid kinase in podosome assembly signaling |
| PIK3CD | Contributes to PI(3,4,5)P3 production for Cdc42 activation | Lipid kinase in podosome assembly signaling |
| PIK3CG | Contributes to PI(3,4,5)P3 production for Cdc42 activation | Lipid kinase in podosome assembly signaling |
| ACTB | Actin monomer that polymerizes into the podosome core | Core structural component |
| ACTG1 | Actin monomer that polymerizes into the podosome core | Core structural component |
| WAS | Actin nucleation-promoting factor relevant to actin-rich adhesion structures | Candidate regulator of actin assembly |
| WASL | Actin nucleation-promoting factor relevant to actin-rich adhesion structures | Candidate regulator of actin assembly |
How Is podosome assembly Regulated?
Podosome assembly is regulated by a combination of lipid signaling, small GTPases, kinases and calcium influx. PI(3,4,5)P3-mediated Cdc42 activation regulates macrophage podosome assembly. ARF1 and its exchange factor ARNO control podosome assembly, linking membrane trafficking to actin dynamics. FAK is required for the assembly of podosome rosettes, and Sos1 regulates macrophage podosome assembly and invasive capacity. Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation, and TRPV2 translocation to the podosome regulates assembly through calcium signaling. Forces and constraints act as overarching controllers of podosome assembly and disassembly, while fascin and cortactin balance turnover and assembly.
podosome assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SOS1 | Macrophage invasion and cancer-related matrix degradation | SOS1 knockout macrophage line for invasion assays |
| CDC42 | Macrophage podosome assembly and immune migration | CDC42 point-mutation macrophage line for assembly studies |
| ARF1 | Podosome assembly and membrane trafficking in invasion | ARF1 knockout cell line for podosome assembly imaging |
| PTK2 (FAK) | Podosome rosette assembly and cancer cell adhesion | FAK knockout cancer cell line for rosette formation assays |
| TRPV2 | Calcium-dependent podosome assembly in immune cells | TRPV2 knock-in tagged line for podosome localization studies |
Cancer invasion and metastasis
Podosome assembly supports invasive capacity in macrophages and cancer cells, and regulators such as Sos1 modulate macrophage invasive capacity. Because podosomes degrade extracellular matrix, their assembly is mechanistically linked to cancer cell invasion.
Vascular and endothelial dysfunction
Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation, connecting hemodynamic stress to vascular remodeling. This suggests that podosome assembly participates in endothelial responses relevant to vascular disease.
Immune cell migration and inflammation
Macrophage podosome assembly is controlled by Cdc42, ARF1, Sos1 and calcium signaling, and these cells rely on podosomes for migration and matrix degradation. Dysregulation of these pathways may contribute to inflammatory and immune-mediated pathology.
From podosome assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is CDC42 required for macrophage podosome assembly? | CDC42 knockout macrophage line |
| Does ARF1 control podosome assembly? | ARF1 knockout cell line |
| Is FAK required for podosome rosette assembly? | FAK knockout cancer cell line |
| Does Sos1 regulate macrophage invasive capacity? | SOS1 knockout macrophage line |
| Does TRPV2 localize to podosomes and regulate assembly? | TRPV2 tagged knock-in line |
| Does fascin control podosome turnover? | FSCN1 knockout or point-mutation line |
How to Study the podosome assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell fluorescence microscopy | Dynamics of podosome assembly and turnover | Visualizing actin-rich podosome formation |
| Immunofluorescence for podosome rosettes | Presence and organization of podosome rosettes | Testing FAK requirement for rosette assembly |
| Matrix degradation assay | Functional matrix-degrading activity of podosomes | Assessing invasive capacity after gene perturbation |
| Calcium imaging | Local calcium signals at podosomes | Studying TRPV2-dependent assembly |
| Shear stress assay | Mechanical induction of podosome assembly | Endothelial mechanobiology studies |
| CRISPR knockout screening | Genes required for podosome assembly | Identifying novel regulators |
| CRISPR knock-in tagging | Localization of podosome components | Tracking TRPV2 or other proteins at podosomes |
| Proteomics of podosome fractions | Protein composition of podosome-enriched fractions | Defining podosome components |
Live-cell imaging of podosome assembly
Live-cell fluorescence microscopy allows visualization of podosome assembly at the substrate-attached part of the cell, using actin markers and podosome component reporters. Time-lapse imaging can capture initiation, core formation and turnover.
Podosome rosette and matrix degradation assays
Podosome rosette formation can be assessed by immunofluorescence, and matrix degradation assays measure the functional output of podosome assembly. These assays are useful for testing genetic perturbations.
Calcium imaging and mechanotransduction studies
Calcium imaging can monitor TRPV2-dependent calcium signals at podosomes, while shear stress or substrate stiffness manipulation can probe mechanotransduction inputs to podosome assembly.
CRISPR-based functional genomics
CRISPR knockout, point-mutation and knock-in models enable causal testing of candidate regulators of podosome assembly. Pooled library screening can identify new genes controlling podosome assembly and invasion.
How CRISPR Can Be Used to Study GO:0071800 podosome assembly
Knockout
CRISPR knockout of genes such as CDC42, ARF1, PTK2 or SOS1 can test their requirement for podosome assembly and rosette formation. Knockout models are useful for loss-of-function studies of podosome assembly.
Point Mutation
Point-mutation models can dissect specific residues or domains required for podosome assembly, such as the SH3 domain of cortactin. These models help distinguish assembly from disassembly functions.
Knock-in
Knock-in of tags or reporters into genes such as TRPV2 enables visualization of protein localization to podosomes and assessment of assembly dynamics. Tagged knock-in lines support live-cell imaging of podosome assembly.
Overexpression
Overexpression of regulators such as Sos1 or VEGF can enhance podosome assembly and invasive capacity, providing gain-of-function evidence. Overexpression models complement knockout studies to establish causality.
How EDITGENE Supports podosome assembly Research
Researchers studying podosome assembly-related genes often need to determine whether a candidate gene is causally involved in the formation, maintenance or turnover of these actin-rich adhesions. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations to test such hypotheses in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for podosome assembly research.
Frequently Asked Questions About podosome assembly
What is GO:0071800 podosome assembly?
GO:0071800 podosome assembly is the biological process of aggregating, arranging and bonding components to form a podosome, an actin-rich adhesion structure that forms upon cell-substrate contact and localizes to the substrate-attached part of the cell.
What genes are involved in podosome assembly?
Genes implicated in podosome assembly include CDC42, ARF1, ARNO, PTK2 (FAK), SOS1, VEGFA, TRPV2, CTTN (cortactin) and FSCN1 (fascin).
How is podosome assembly regulated?
Podosome assembly is regulated by PI(3,4,5)P3-mediated Cdc42 activation, ARF1 and ARNO, FAK, Sos1, VEGF signaling, TRPV2 calcium signaling, and actin-bundling proteins such as fascin and cortactin.
What is the role of Cdc42 in podosome assembly?
PI(3,4,5)P3-mediated Cdc42 activation regulates macrophage podosome assembly.
How does ARF1 control podosome assembly?
ARF1 and its nucleotide exchange factor ARNO control podosome assembly, linking membrane trafficking to actin dynamics.
Why is FAK important for podosome rosettes?
FAK is required for the assembly of podosome rosettes, which are organized arrays of podosomes.
What is the role of Sos1 in podosome assembly?
Sos1 regulates macrophage podosome assembly and macrophage invasive capacity.
How does shear stress affect podosome assembly?
Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation.
What is the role of TRPV2 in podosome assembly?
Translocation of the calcium-permeable TRPV2 channel to the podosome regulates podosome assembly.
How do fascin and cortactin affect podosomes?
Fascin actin bundling controls podosome turnover and disassembly, while cortactin is involved in podosome assembly via its SH3 domain.
Conclusion
GO:0071800 podosome assembly defines the formation of actin-rich adhesion structures at the cell-substrate contact site, a process controlled by forces, GTPases, kinases and calcium signaling. Understanding its molecular regulation provides insight into cell invasion, immune migration and vascular mechanobiology. CRISPR-based cell models offer a powerful approach to causally test the genes that drive podosome assembly.
References
- 1. Rafiq NBM et al.. 2019. Forces and constraints controlling podosome assembly and disassembly.. Philos Trans R Soc Lond B Biol Sci 374(1779):20180228 PMID: 31431172
- 2. Qi Y et al.. 2025. PI(3,4,5)P3-mediated Cdc42 activation regulates macrophage podosome assembly.. Cell Mol Life Sci 82(1):127 PMID: 40126693
- 3. Rafiq NB et al.. 2017. Podosome assembly is controlled by the GTPase ARF1 and its nucleotide exchange factor ARNO.. J Cell Biol 216(1):181-197 PMID: 28007915
- 4. Pan YR et al.. 2011. FAK is required for the assembly of podosome rosettes.. J Cell Biol 195(1):113-29 PMID: 21969470
- 5. Baruzzi A et al.. 2015. Sos1 Regulates Macrophage Podosome Assembly and Macrophage Invasive Capacity.. J Immunol 195(10):4900-12 PMID: 26447228
- 6. Fey T et al.. 2016. Impaired endothelial shear stress induces podosome assembly via VEGF up-regulation.. FASEB J 30(8):2755-66 PMID: 27103579
- 7. Nagasawa M et al.. 2012. Translocation of calcium-permeable TRPV2 channel to the podosome: Its role in the regulation of podosome assembly.. Cell Calcium 51(2):186-93 PMID: 22226146
- 8. Van Audenhove I et al.. 2015. Fascin actin bundling controls podosome turnover and disassembly while cortactin is involved in podosome assembly by its SH3 domain in THP-1 macrophages and dendritic cells.. Biochim Biophys Acta 1853(5):940-52 PMID: 25601713
