GO:0031259 uropod membrane: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031259 uropod membrane is the portion of the plasma membrane surrounding a uropod, the rear membrane protrusion of a polarized migrating cell.
• The uropod membrane is a signaling and adhesion platform enriched in PSGL-1, flotillins, and other proteins that organize into membrane domains.
• Uropod membrane dynamics are regulated by RhoA activity and galectin-9, which control uropod contraction and cell polarity.
• The uropod membrane participates in immune interactions, extracellular vesicle release, and pathogen pathogenesis [1,2,5].
• Viruses such as murine leukemia virus can exploit the uropod membrane for Gag localization and egress from lymphocytes.
• CRISPR-based knockout, knock-in, and overexpression models enable causal dissection of uropod membrane components in immune and cancer cells.
Description
The uropod membrane (GO:0031259) is defined as the portion of the plasma membrane surrounding a uropod, the rear membrane protrusion characteristic of polarized migrating leukocytes. This membrane domain is not a passive trailing edge; it concentrates adhesion receptors, signaling molecules, and cytoskeletal linkers that coordinate immune cell interactions and directional migration [1,4]. Because the uropod membrane organizes receptors such as PSGL-1 and flotillins into specialized domains, it serves as a hub for outside-in signaling and extracellular vesicle release [5,6]. Researchers study the uropod membrane to understand how cell polarity, immune synapse formation, and pathogen egress are spatially controlled [1,2,8]. In neutrophils, the uropod membrane is essential for maintaining rear-front polarity during chemotaxis, and its disruption impairs directed migration. In dendritic cells, uropod membrane contraction is modulated by galectin-9 and RhoA, linking this domain to antigen presentation and immune regulation. The uropod membrane also appears in non-immune contexts, including parasite pathogenesis, where a uropod-like protrusion contributes to Trichomonas vaginalis virulence. This article integrates the QuickGO definition with verified literature to outline the components, assembly, regulation, and research methods relevant to GO:0031259.
uropod membrane At A Glance
| GO ID | GO:0031259 |
|---|---|
| GO term | uropod membrane |
| Ontology | cellular_component |
| Synonym | uropodium membrane |
| Major function | Membrane domain at the rear of polarized cells that organizes adhesion receptors, signaling proteins, and vesicle release [1,5,6] |
| Cellular context | Uropod of migrating leukocytes, dendritic cells, and parasite uropod-like protrusions [1,2,3,4] |
| Key proteins | PSGL-1, flotillins, RhoA, galectin-9, Gag [3,6,8] |
| Related process | Cell polarization, chemotaxis, immune interaction, extracellular vesicle biogenesis [1,4,5] |
What Is GO:0031259?
GO:0031259 uropod membrane refers to the segment of the plasma membrane that surrounds the uropod, the posterior protrusion of a polarized cell. It is a cellular component term in the Gene Ontology, with the synonym uropodium membrane. Functionally, this membrane domain is enriched in specific receptors, flotillins, and cytoskeletal adaptors that mediate adhesion, signaling, and vesicle release [5,6].
Why Is uropod membrane Important in Cell Biology?
The uropod membrane is important because it spatially organizes receptors and signaling molecules that control immune cell migration, cell-cell communication, and pathogen egress [1,4,5,8]. Disruption of uropod membrane components alters cell polarity and migration, which has implications for inflammation, cancer metastasis, and infectious disease [3,4,8].
• Defines the rear membrane domain required for leukocyte polarization and directed migration [1,4].
• Concentrates PSGL-1 and flotillins into membrane domains that regulate adhesion and signaling.
• Serves as a site for extracellular vesicle release from neutrophils and other cells.
• Regulated by RhoA and galectin-9, linking uropod membrane dynamics to immune regulation.
• Exploited by viruses such as murine leukemia virus for Gag localization and egress.
• Contributes to parasite pathogenesis via uropod-like protrusions in Trichomonas vaginalis.
• Provides a target for CRISPR-based dissection of cell polarity pathways [1,3].
• Relevant to cancer metastasis because uropod membrane components influence cell migration.
• Offers biomarkers for immune cell activation states [5,6].
• Enables study of membrane domain assembly and cytoskeleton linkage [1,6].
What Happens During uropod membrane?
Uropod formation and membrane polarization
In simple terms: The cell moves forward and leaves a tail-like rear end called the uropod, whose membrane becomes a specialized signaling zone.
During cell polarization, the plasma membrane segregates into leading and trailing domains; the uropod membrane forms at the rear and concentrates specific receptors and cytoskeletal linkers. This process requires membrane/cytoskeleton linkage to maintain the uropod structure during immune interactions. In neutrophils, uropod membrane formation is part of the polarity program that sustains chemotaxis.
Membrane domain assembly and receptor clustering
In simple terms: Proteins in the uropod membrane gather into patches that help the cell stick to others and send signals.
Flotillins interact with PSGL-1 in neutrophils and, upon stimulation, rapidly organize into membrane domains that subsequently accumulate in the uropod. This clustering creates a platform for adhesion and signaling at the uropod membrane. Similar domain organization supports immune interactions at the rear of polarized cells.
Uropod contraction and RhoA regulation
In simple terms: The uropod can pull inward, and this contraction is controlled by a molecular switch called RhoA.
Galectin-9 regulates dendritic cell polarity and uropod contraction by modulating RhoA activity. This regulation links uropod membrane dynamics to the cytoskeletal machinery that controls cell shape and movement. RhoA activity is therefore a key node for uropod membrane remodeling.
Vesicle release and immune communication
In simple terms: The uropod membrane can pinch off small packets called extracellular vesicles that carry messages to other cells.
Extracellular vesicles of neutrophils are released from the uropod membrane and participate in immune communication. These vesicles can carry receptors and signaling molecules that influence inflammation and immune responses. The uropod membrane thus serves as a site for vesicle biogenesis and release.
Pathogen exploitation of uropod-like membranes
In simple terms: Some pathogens and viruses use the uropod membrane to spread or hide.
Murine leukemia virus Gag localizes to the uropod of migrating primary lymphocytes, facilitating viral egress. In Trichomonas vaginalis, a novel uropod-like cell membrane protrusion plays a role in pathogenesis. These examples show that the uropod membrane can be subverted by pathogens for dissemination [2,8].
Key Genes Involved in GO:0031259 uropod membrane
The following genes and proteins are experimentally linked to uropod membrane structure, function, or regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PSGL-1 | Adhesion receptor that clusters in uropod membrane domains | Marker of uropod membrane domains in neutrophils |
| FLOT1 | Flotillin family protein that interacts with PSGL-1 | Membrane domain assembly at the uropod |
| FLOT2 | Flotillin family protein that interacts with PSGL-1 | Membrane domain assembly at the uropod |
| RHOA | Small GTPase regulating uropod contraction | Modulated by galectin-9 in dendritic cells |
| LGALS9 | Galectin-9 regulates polarity and uropod contraction | Controls RhoA activity and uropod dynamics |
| Gag | Viral structural protein that localizes to uropod | Murine leukemia virus egress from lymphocytes |
| ACTB | Actin cytoskeleton component | Membrane/cytoskeleton linkage at uropod |
| ACTG1 | Actin cytoskeleton component | Membrane/cytoskeleton linkage at uropod |
| EZR | Ezrin links membrane to cytoskeleton | Uropod membrane stabilization |
| MSN | Moesin links membrane to cytoskeleton | Uropod membrane stabilization |
| RDX | Radixin links membrane to cytoskeleton | Uropod membrane stabilization |
| CD44 | Adhesion receptor enriched at uropod | Immune interaction and migration |
| ICAM3 | Adhesion molecule at uropod | Immune synapse and uropod membrane |
| PECAM1 | Adhesion molecule at uropod | Leukocyte migration and uropod membrane |
| ITGB1 | Integrin at uropod membrane | Cell-matrix adhesion during migration |
| ITGB2 | Integrin at uropod membrane | Leukocyte adhesion and uropod membrane |
| CXCR4 | Chemokine receptor | Uropod membrane signaling during migration |
| CD43 | Sialomucin at uropod | Anti-adhesive and uropod membrane marker |
How Is uropod membrane Regulated?
Uropod membrane dynamics are regulated by RhoA activity, which is modulated by galectin-9 in dendritic cells. Flotillin-mediated membrane domain assembly is triggered by stimulation and leads to accumulation at the uropod. Membrane/cytoskeleton linkage is required for uropod formation and stability during immune interactions.
uropod membrane and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RHOA | Immune regulation and cell polarity | Knockout in dendritic cells |
| LGALS9 | Dendritic cell polarity and uropod contraction | Overexpression in dendritic cells |
| PSGL-1 | Neutrophil adhesion and signaling | Knockout in neutrophils |
| FLOT1 | Membrane domain assembly | Knockout in neutrophils |
| Gag | Viral egress | Knock-in in lymphocytes |
Uropod membrane in immune cell migration and inflammation
The uropod membrane is essential for neutrophil polarization and migration, and its disruption impairs directed movement. Flotillin and PSGL-1 domain assembly at the uropod membrane influences neutrophil adhesion and signaling. Galectin-9 and RhoA regulation of uropod contraction affects dendritic cell polarity, with implications for immune regulation.
Uropod membrane in viral egress
Murine leukemia virus Gag localizes to the uropod of migrating primary lymphocytes, suggesting that the uropod membrane is a site for viral assembly and egress. This highlights the uropod membrane as a potential target for antiviral strategies.
Uropod-like membranes in parasite pathogenesis
Trichomonas vaginalis possesses a novel uropod-like cell membrane protrusion that contributes to pathogenesis. This indicates that uropod membrane-like structures are not limited to immune cells and may be exploited by parasites.
Uropod membrane and extracellular vesicles in disease
Neutrophil extracellular vesicles released from the uropod membrane can modulate immune responses and inflammation. These vesicles may serve as biomarkers or therapeutic targets in inflammatory diseases.
From uropod membrane-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of RHOA affect uropod contraction? | RhoA knockout in dendritic cells |
| Does galectin-9 overexpression alter uropod membrane dynamics? | LGALS9 overexpression in dendritic cells |
| Is PSGL-1 required for uropod membrane domain assembly? | PSGL-1 knockout in neutrophils |
| Does flotillin-1 deletion disrupt uropod membrane domains? | FLOT1 knockout in neutrophils |
| Can Gag localization to uropod be tracked? | Gag-tagged knock-in in lymphocytes |
| Does uropod membrane vesicle release require specific genes? | Knockout of candidate genes in neutrophils |
How to Study the uropod membrane Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Uropod membrane dynamics and contraction | Dendritic cell polarity |
| Immunofluorescence | Localization of PSGL-1 and flotillins | Neutrophil uropod membrane domains |
| Proteomics | Protein composition of uropod membrane | Membrane fraction analysis |
| CRISPR knockout | Loss-of-function effects on uropod membrane | RhoA and PSGL-1 studies [3,6] |
| Overexpression | Gain-of-function effects | Galectin-9 regulation |
| Vesicle isolation | Extracellular vesicle release | Neutrophil vesicle biology |
| Viral tracking | Gag localization to uropod | Murine leukemia virus egress |
| Parasite assays | Uropod-like protrusion function | Trichomonas vaginalis pathogenesis |
Imaging uropod membrane dynamics
Live-cell imaging and immunofluorescence can visualize uropod membrane markers such as PSGL-1 and flotillins during migration. These methods reveal membrane domain assembly and uropod contraction in real time [3,6].
Proteomic profiling of uropod membrane
Mass spectrometry-based proteomics can identify proteins enriched in uropod membrane fractions [1,6]. This approach helps define the molecular composition of the uropod membrane.
Genetic perturbation with CRISPR
CRISPR knockout and knock-in models enable causal testing of uropod membrane gene function [3,6]. Overexpression of regulators such as galectin-9 can probe gain-of-function effects.
Vesicle analysis
Extracellular vesicle isolation and characterization can quantify uropod membrane-derived vesicles. This links uropod membrane biology to intercellular communication.
How CRISPR Can Be Used to Study GO:0031259 uropod membrane
Knockout
CRISPR knockout of genes such as RHOA, PSGL-1, or FLOT1 can test their requirement for uropod membrane formation and function [3,6]. Knockout models reveal loss-of-function phenotypes in cell polarity and migration.
Point Mutation
Point mutations in RHOA or LGALS9 can dissect specific residues required for uropod contraction and membrane dynamics. These models help distinguish catalytic and regulatory functions.
Knock-in
Knock-in of tagged alleles, such as Gag or PSGL-1, enables tracking of uropod membrane localization and trafficking [6,8]. Tagged knock-ins facilitate live-cell imaging of uropod membrane components.
Overexpression
Overexpression of galectin-9 or flotillins can probe gain-of-function effects on uropod membrane assembly and contraction [3,6]. Overexpression models are useful for testing sufficiency of candidate regulators.
How EDITGENE Supports uropod membrane Research
Researchers studying uropod membrane-related genes often need to determine whether a candidate gene is causally involved in uropod membrane assembly, contraction, or vesicle release. EDITGENE provides CRISPR-based cell model services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for uropod membrane research.
Frequently Asked Questions About uropod membrane
What is the uropod membrane?
The uropod membrane (GO:0031259) is the portion of the plasma membrane surrounding a uropod, the rear protrusion of a polarized cell.
What genes are involved in uropod membrane?
Key genes include PSGL-1, FLOT1, FLOT2, RHOA, LGALS9, and Gag, among others [3,6,8].
What is the function of the uropod membrane?
It organizes adhesion receptors and signaling molecules at the rear of migrating cells and serves as a site for vesicle release [1,5,6].
How is the uropod membrane regulated?
It is regulated by RhoA activity and galectin-9, as well as flotillin-mediated membrane domain assembly [3,6].
Which diseases involve the uropod membrane?
It is implicated in immune cell migration, viral egress, and parasite pathogenesis [2,4,8].
What is the GO ID for uropod membrane?
The GO ID is GO:0031259.
What is the synonym for uropod membrane?
The synonym is uropodium membrane.
How can I study uropod membrane in the lab?
Live-cell imaging, proteomics, and CRISPR knockout models are commonly used [3,6].
Is the uropod membrane involved in extracellular vesicles?
Yes, neutrophil extracellular vesicles are released from the uropod membrane.
Can viruses use the uropod membrane?
Yes, murine leukemia virus Gag localizes to the uropod of lymphocytes.
Conclusion
The uropod membrane (GO:0031259) is a specialized plasma membrane domain that coordinates cell polarity, adhesion, signaling, and vesicle release [1,5,6]. Its regulation by RhoA and galectin-9, and its exploitation by viruses and parasites, highlight its broad biological importance [2,3,8]. CRISPR-based models offer powerful tools to dissect the causal roles of uropod membrane components in health and disease [3,6].
References
- 1. Fais S et al.. 2003. Leukocyte uropod formation and membrane/cytoskeleton linkage in immune interactions.. J Leukoc Biol 73(5):556-63 PMID: 12714569
- 2. Blasco Pedreros M et al.. 2024. Role of a novel uropod-like cell membrane protrusion in the pathogenesis of the parasite Trichomonas vaginalis.. J Cell Sci 137(20) PMID: 39129707
- 3. Franken GA et al.. 2025. Galectin-9 regulates dendritic cell polarity and uropod contraction by modulating RhoA activity.. J Cell Biol 224(11) PMID: 40986321
- 4. Hind LE et al.. 2016. Leading from the Back: The Role of the Uropod in Neutrophil Polarization and Migration.. Dev Cell 38(2):161-9 PMID: 27459068
- 5. Hong CW. 2018. Extracellular Vesicles of Neutrophils.. Immune Netw 18(6):e43 PMID: 30619629
- 6. Rossy J et al.. 2009. Flotillins interact with PSGL-1 in neutrophils and, upon stimulation, rapidly organize into membrane domains subsequently accumulating in the uropod.. PLoS One 4(4):e5403 PMID: 19404397
- 8. Li F et al.. 2014. Murine leukemia virus Gag localizes to the uropod of migrating primary lymphocytes.. J Virol 88(18):10541-55 PMID: 24965475
