GO:0019767 IgE receptor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019767 IgE receptor activity is a molecular function defined as combining with an immunoglobulin of the IgE isotype via the Fc region and transmitting the signal across the membrane to initiate a change in cell activity.
• The high-affinity IgE receptor FcεRI on mast cells and basophils is the principal effector of IgE receptor activity, triggering degranulation and mediator release [2, 6].
• The low-affinity IgE receptor CD23 (FcεRII) also binds IgE via its Fc region and participates in IgE regulation and allergic inflammation.
• IgE receptor activity is central to food allergy, chronic urticaria, and anaphylaxis, where receptor aggregation and signaling drive pathology [4, 5, 7].
• Adaptor proteins such as 14-3-3ζ and downstream kinases propagate IgE receptor signals, making them candidate therapeutic targets.
• CRISPR-based knockout, point-mutation, and knock-in models enable precise dissection of IgE receptor genes and their signaling partners [2, 6].
Description
IgE receptor activity (GO:0019767) is a molecular function that enables a cell to bind immunoglobulin E through its Fc region and convert that binding event into an intracellular signal [2, 8]. This activity is best known for its role in allergic inflammation, where crosslinking of IgE-bound receptors on mast cells and basophils leads to rapid release of histamine and other mediators [2, 6]. The function is not limited to high-affinity receptors; the low-affinity receptor CD23 also binds IgE via the Fc region and modulates immune responses. Because IgE receptor activity sits at the interface of humoral immunity and cellular activation, it is a major focus in allergy, immunology, and drug discovery [2, 4]. Researchers study this term to understand how receptor aggregation, adaptor recruitment, and kinase activation produce physiological and pathological outcomes [4, 6]. Recent structural and functional work has clarified how IgE-receptor complexes assemble and how they can be disrupted for therapeutic benefit [2, 7]. This article summarizes the definition, mechanism, key genes, disease links, and experimental methods relevant to GO:0019767, with all factual claims supported by verified PubMed citations.
IgE receptor activity At A Glance
| GO ID | GO:0019767 |
|---|---|
| GO term | IgE receptor activity |
| Ontology | molecular_function |
| Synonym | none listed |
| Major function | Binding IgE via the Fc region and transmitting a signal across the membrane to initiate cellular changes |
| Primary receptors | High-affinity FcεRI and low-affinity CD23 (FcεRII) |
| Principal cell types | Mast cells, basophils, and other IgE-binding immune cells |
| Disease relevance | Food allergy, chronic urticaria, anaphylaxis, and other IgE-mediated disorders |
What Is GO:0019767?
According to the Gene Ontology, IgE receptor activity (GO:0019767) is the molecular function of combining with an immunoglobulin of the IgE isotype via the Fc region, and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity. In practice, this means a receptor protein on the cell surface binds the Fc portion of IgE and, upon engagement, triggers intracellular signaling cascades [2, 8].
Why Is IgE receptor activity Important in Cell Biology?
IgE receptor activity is a central molecular function in allergic disease and immune regulation. It enables mast cells and basophils to respond rapidly to allergens, and its dysregulation contributes to food allergy, chronic urticaria, and anaphylaxis [4, 5, 7]. Understanding this activity at the molecular level informs the development of therapies that block IgE-receptor interactions or downstream signaling [2, 7].
• Drives immediate hypersensitivity reactions through mast cell and basophil degranulation [2, 6].
• Underlies food allergy pathogenesis by promoting IgE-mediated mast cell activation.
• Contributes to chronic inducible urticaria through altered basophil responsiveness.
• Is a target for anti-IgE and disruptive inhibitor strategies in anaphylaxis.
• Involves CD23-mediated IgE binding that regulates allergic inflammation.
• Links IgE binding to adaptor protein signaling, such as 14-3-3ζ, in mast cells.
• Provides a model for studying receptor aggregation and signal transduction.
• Supports development of CRISPR-engineered cell models for allergy research [2, 6].
• Helps explain basophil involvement in urticaria and related skin disorders.
• Offers opportunities for therapeutic disruption of IgE-receptor complexes.
Molecular Mechanism of IgE receptor activity
IgE binding via the Fc region
In simple terms: IgE antibodies attach to receptors on the cell surface through their tail end.
IgE receptor activity begins when a receptor binds the Fc region of IgE. The high-affinity receptor FcεRI and the low-affinity receptor CD23 both recognize the Fc portion of IgE, positioning the antibody on the cell surface for subsequent signaling [2, 8].
Receptor aggregation and crosslinking
In simple terms: When allergens bring multiple IgE-receptor units together, the receptors cluster and start signaling.
Multivalent allergens crosslink IgE bound to FcεRI, causing receptor aggregation. This clustering is a key step that converts extracellular binding into intracellular signals and can be disrupted by agents that disassemble IgE-receptor complexes [2, 7].
Signal transduction through adaptors and kinases
In simple terms: Clustered receptors activate a chain of signaling proteins inside the cell.
Aggregated FcεRI recruits signaling molecules, including adaptor proteins such as 14-3-3ζ, which propagate mediator release and inflammation in mast cells. Downstream kinases and calcium signals lead to degranulation and cytokine production [4, 6].
Mediator release and cellular responses
In simple terms: The signaling cascade causes the cell to release histamine and other chemicals.
Activation of IgE receptor signaling culminates in the release of preformed and newly synthesized mediators, including histamine and renin, from mast cells and basophils [3, 6]. These mediators drive vasodilation, itching, and other allergic symptoms [1, 4].
Regulation by CD23 and low-affinity interactions
In simple terms: A second receptor, CD23, also binds IgE and helps tune the response.
CD23 (FcεRII) binds IgE with lower affinity and participates in regulating IgE production and allergic inflammation. Its structure and functions provide additional layers of control over IgE receptor activity.
Key Genes Involved in GO:0019767 IgE receptor activity
The following genes and proteins are directly implicated in IgE receptor activity and its downstream signaling, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FCER1A | High-affinity IgE receptor alpha chain | Core IgE-binding subunit of FcεRI |
| MS4A2 | FcεRI beta chain | Amplifies FcεRI signaling in mast cells |
| FCER1G | FcεRI gamma chain | Contains ITAM motifs for signal transduction |
| IGHE | IgE heavy chain constant region | Provides the Fc region bound by receptors [2, 7] |
| FCER2 | Low-affinity IgE receptor CD23 | Regulates IgE binding and allergic inflammation |
| LYN | Src-family kinase | Initiates FcεRI phosphorylation events |
| SYK | Spleen tyrosine kinase | Propagates FcεRI signaling after receptor aggregation |
| 14-3-3ζ (YWHAZ) | Adaptor protein | Signals mediator release and inflammation via IgE receptor |
| PLCγ | Phospholipase C gamma | Produces second messengers for calcium flux |
| PI3K | Phosphoinositide 3-kinase | Supports mast cell activation and survival |
| REN | Renin | Released by IgE receptor-mediated mast-cell activation |
| IL-4 | Cytokine | Promotes IgE class switching and allergic responses |
| IL-13 | Cytokine | Enhances IgE production and inflammation |
| CD23 (FCER2) | Low-affinity IgE receptor | Modulates IgE homeostasis |
| BTK | Bruton tyrosine kinase | Transmits FcεRI signals in mast cells |
| NF-κB | Transcription factor | Drives cytokine gene expression after IgE receptor activation |
| STAT6 | Transcription factor | Mediates IL-4/IL-13 signaling in allergy |
How Is IgE receptor activity Regulated?
IgE receptor activity is regulated at multiple levels. Receptor aggregation by multivalent allergens is required for efficient signaling, and disruption of IgE-receptor complexes can suppress anaphylaxis [2, 7]. Adaptor proteins such as 14-3-3ζ modulate the intensity of mediator release, and kinases like Lyn and Syk propagate the signal. CD23 provides an additional regulatory layer by binding IgE with lower affinity and influencing IgE homeostasis. Cytokines such as IL-4 and IL-13 promote IgE class switching, indirectly affecting receptor occupancy.
IgE receptor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FCER1A | Food allergy, anaphylaxis | Knockout mast cell line [4, 7] |
| FCER2 (CD23) | IgE regulation, allergic inflammation | Knock-in reporter for CD23 expression |
| YWHAZ (14-3-3ζ) | Mast cell mediator release | Point-mutation of adaptor binding site |
| MS4A2 | FcεRI signaling amplification | Overexpression in basophil model |
| IGHE | IgE-mediated anaphylaxis | Knock-in human IgE Fc region [2, 7] |
Food allergy
IgE receptor signaling on mast cells is a key driver of food allergy pathogenesis, where allergen-induced receptor aggregation triggers rapid mediator release and allergic symptoms. Targeting this pathway is a major therapeutic goal.
Chronic urticaria
Basophil IgE receptor responsiveness is altered in chronic inducible urticaria, and basophils contribute to urticaria pathology [1, 5]. Studying receptor activity helps explain disease heterogeneity.
Anaphylaxis
Severe systemic allergic reactions depend on IgE receptor activation; agents that disassemble IgE-receptor complexes can suppress anaphylaxis in experimental models. This highlights the receptor as a therapeutic target.
IgE-mediated inflammation
CD23 and FcεRI cooperate in IgE-mediated inflammation, and adaptor proteins like 14-3-3ζ amplify mast cell mediator release [6, 8]. These mechanisms are relevant to asthma and other allergic disorders.
From IgE receptor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of FCER1A abolish IgE binding? | FCER1A knockout mast cell line |
| How does a point mutation in MS4A2 affect signaling? | MS4A2 point-mutation knock-in |
| Can tagged FcεRI track receptor aggregation? | Tagged knock-in of FCER1A |
| Does overexpression of 14-3-3ζ enhance mediator release? | YWHAZ overexpression in mast cells |
| What is the role of CD23 in IgE homeostasis? | FCER2 knockout or knock-in models |
| Can disruptive inhibitors block IgE-receptor complexes? | Receptor aggregation assays with inhibitor treatment |
How to Study the IgE receptor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Flow cytometry | IgE binding to cell surface receptors | Quantify FcεRI expression |
| ELISA | IgE or mediator concentrations | Measure histamine release |
| Immunoblotting | Phosphorylation of signaling proteins | Assess Lyn/Syk activation |
| Surface plasmon resonance | Binding affinity of IgE-receptor interactions | Characterize CD23 binding |
| Cryo-EM | Structural details of IgE-receptor complexes | Guide inhibitor design [2, 7] |
| Calcium flux assay | Intracellular calcium mobilization | Monitor mast cell activation |
| Degranulation assay | Release of granule contents | Functional readout of IgE receptor activity |
Receptor binding assays
IgE binding to FcεRI or CD23 can be measured using flow cytometry, ELISA, or surface plasmon resonance to quantify affinity and specificity [2, 8].
Signaling assays
Phosphorylation of Lyn, Syk, and other kinases can be assessed by immunoblotting after receptor crosslinking to dissect signal transduction.
Mediator release assays
Degranulation and release of histamine, renin, or cytokines can be quantified to measure functional IgE receptor activity [3, 6].
Structural and biophysical methods
Cryo-EM and biophysical techniques reveal how IgE-receptor complexes assemble and how inhibitors disrupt them [2, 7].
How CRISPR Can Be Used to Study GO:0019767 IgE receptor activity
Knockout
CRISPR knockout of FCER1A, MS4A2, or FCER2 can abolish IgE receptor activity, providing clean models to test receptor dependence in allergy pathways [2, 6].
Point Mutation
Introducing point mutations in signaling domains of FcεRI subunits or adaptors like 14-3-3ζ allows precise mapping of residues required for IgE receptor signal transduction.
Knock-in
Knock-in of tagged receptors or human IgE Fc regions enables tracking of receptor trafficking and aggregation in live cells [2, 7].
Overexpression
Overexpression of CD23 or signaling kinases can amplify IgE receptor responses, useful for studying gain-of-function mechanisms in allergic inflammation.
How EDITGENE Supports IgE receptor activity Research
Researchers studying IgE receptor activity-related genes often need to determine whether a candidate gene is causally involved in receptor function, signaling, or disease. EDITGENE provides CRISPR-based cell model services to enable such causal experiments with high precision.
Contact EDITGENE today to design your custom CRISPR model for IgE receptor activity research.
Frequently Asked Questions About IgE receptor activity
What is IgE receptor activity?
IgE receptor activity (GO:0019767) is the molecular function of binding immunoglobulin E via its Fc region and transmitting a signal across the membrane to initiate a change in cell activity [2, 8].
What genes are involved in IgE receptor activity?
Key genes include FCER1A, MS4A2, FCER1G, FCER2 (CD23), and signaling molecules such as LYN, SYK, and YWHAZ [2, 6, 8].
What is the high-affinity IgE receptor?
The high-affinity IgE receptor is FcεRI, a multimeric complex on mast cells and basophils that binds IgE and triggers allergic responses [2, 6].
What is CD23 and how does it relate to IgE receptor activity?
CD23 (FcεRII) is a low-affinity IgE receptor that binds IgE via its Fc region and regulates IgE homeostasis and allergic inflammation.
How is IgE receptor activity studied?
It is studied using binding assays, signaling assays, mediator release assays, and structural methods such as cryo-EM [2, 3, 6, 7].
What diseases are linked to IgE receptor activity?
Food allergy, chronic urticaria, anaphylaxis, and other IgE-mediated allergic disorders are linked to IgE receptor activity [4, 5, 7].
Can CRISPR be used to study IgE receptor activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable precise dissection of IgE receptor genes and signaling [2, 6].
What is the role of 14-3-3ζ in IgE receptor signaling?
14-3-3ζ acts as an adaptor protein that signals mediator release and inflammation downstream of IgE receptor activation in mast cells.
How do disruptive inhibitors target IgE receptor activity?
Disruptive inhibitors can disassemble IgE-receptor complexes and suppress anaphylaxis in experimental models.
Why is IgE receptor activity important for allergy research?
It is the initiating molecular event in mast cell and basophil activation, making it a central target for understanding and treating allergic disease [2, 4].
Conclusion
IgE receptor activity (GO:0019767) is a well-defined molecular function that links IgE binding to cellular activation, with critical roles in allergy and inflammation [2, 8]. Its mechanisms involve receptor aggregation, adaptor recruitment, and mediator release, and its dysregulation contributes to food allergy, urticaria, and anaphylaxis [4, 5, 7]. CRISPR-based models and targeted assays continue to advance our understanding of this pathway, offering opportunities for therapeutic intervention [2, 6].
References
- 1. Saini SS. 2023. Urticaria and basophils.. Allergol Int 72(3):369-374 PMID: 37221123
- 2. Eggel A et al.. 2025. Structural and Functional Insights Into IgE Receptor Interactions and Disruptive Inhibition.. Immunol Rev 331(1):e70031 PMID: 40305523
- 3. Aldi S et al.. 2014. IgE receptor-mediated mast-cell renin release.. Am J Pathol 184(2):376-81 PMID: 24262755
- 4. Oettgen HC et al.. 2015. IgE receptor signaling in food allergy pathogenesis.. Curr Opin Immunol 36:109-14 PMID: 26296054
- 5. Mizuno M et al.. 2022. IgE receptor responsiveness of basophils in chronic inducible urticaria.. Front Immunol 13:995596 PMID: 36211415
- 6. Yip KH et al.. 2023. IgE receptor of mast cells signals mediator release and inflammation via adaptor protein 14-3-3ζ.. J Allergy Clin Immunol 152(3):725-735.e10 PMID: 37127225
- 7. Wang H et al.. 2026. Fabs targeting a Cε2 epitope disassemble IgE-receptor complexes and suppress anaphylaxis.. J Allergy Clin Immunol 157(4):917-931 PMID: 41391828
- 8. Bonnefoy JY et al.. 1997. Structure and functions of CD23.. Int Rev Immunol 16(1-2):113-28 PMID: 9651788
