FOXP3 Gene: Master Regulator of Regulatory T Cells and Immune Tolerance
Explore the FOXP3 gene, its role in immune regulation, associated diseases, expression patterns, and clinical significance.
Gene Information Card
| Symbol | FOXP3 |
|---|---|
| Full Name | Forkhead Box P3 |
| Gene Type | Protein coding |
| Chromosomal Location | Xp11.23 |
| NCBI Gene ID | 50943 ncbi.nlm.nih.gov/gene/50943 |
| Ensembl ID | ENSG00000049768 |
| UniProt ID | Q9BZS1 |
| OMIM ID | 300292 |
| HGNC ID | 6106 |
| Aliases | IPEX, AIID, PIDX, JM2, DIETER |
Description
FOXP3 encodes a forkhead box transcription factor that is essential for the development and function of regulatory T cells (Tregs), which are critical for maintaining immune homeostasis and preventing autoimmunity. Mutations in FOXP3 cause IPEX syndrome (immune dysregulation, polyendocrinopathy, enteropathy, X-linked), a severe autoimmune disorder. FOXP3 is also implicated in cancer immunity, where its expression in tumor-infiltrating Tregs can suppress anti-tumor immune responses.
Disease Associations
| Disease category | Pathophysiological mechanism | Genomic evidence |
|---|---|---|
| IPEX syndrome | Loss-of-function mutations in FOXP3 impair Treg development and function, leading to uncontrolled effector T cell activation and multi-organ autoimmunity. | ClinVar, OMIM |
| Type 1 diabetes (polyendocrine syndrome) | FOXP3 mutations disrupt immune tolerance, contributing to autoimmune destruction of pancreatic beta cells in IPEX patients. | OMIM, PubMed |
| Allergic and atopic diseases | Reduced FOXP3 expression or function in Tregs is associated with impaired suppression of allergic responses. | PubMed, ClinVar |
| Cancer (various) | High FOXP3 expression in tumor-infiltrating Tregs correlates with poor prognosis in several cancers, as Tregs suppress anti-tumor immunity. | COSMIC, PubMed |
Expression Profile
Tissue Expression
| Tissue | nTPM | level |
|---|---|---|
| Lymph node | 0.0 | Not detected |
| Spleen | 0.0 | Not detected |
| Thymus | 0.0 | Not detected |
| Bone marrow | 0.0 | Not detected |
| Blood | 0.0 | Not detected |
| Lung | 0.0 | Not detected |
| Colon | 0.0 | Not detected |
| Kidney | 0.0 | Not detected |
| Liver | 0.0 | Not detected |
| Brain | 0.0 | Not detected |
Cell Line Expression
| Cell Line | nTPM | Notes |
|---|---|---|
| Tregs (CD4+ CD25+ FOXP3+) | Not available | High expression; nuclear localization |
| Activated conventional T cells | Not available | Transient low-level expression upon activation |
| Jurkat (T cell leukemia) | Not available | Low/absent expression |
| MCF7 (breast cancer) | Not available | Low expression; may be induced by TGF-beta |
| HeLa (cervical cancer) | Not available | Low expression |
Data source：Human Protein Atlas（proteinatlas.org）
Mutations & Variants
Hotspot Mutations
| Variant | Type | Frequency | Functional Description |
|---|---|---|---|
| c.750_751del (p.Val251fs) | Frameshift | Rare | Loss of function; causes IPEX |
| c.1017G>A (p.Met339Ile) | Missense | Rare | Loss of function; impairs DNA binding |
| c.1150G>A (p.Ala384Thr) | Missense | Rare | Loss of function; disrupts forkhead domain |
| c.1190G>A (p.Arg397Gln) | Missense | Rare | Loss of function; reduces transcriptional activity |
| c.1222G>A (p.Gly408Arg) | Missense | Rare | Loss of function; affects nuclear localization |
Mutation functional classification
Loss of Function (LOF)
Most FOXP3 mutations are loss-of-function, leading to reduced or absent protein function, impaired Treg differentiation, and IPEX syndrome.
Gain of Function (GOF)
Gain-of-function mutations are rare; some variants may increase FOXP3 repressive activity, potentially contributing to enhanced immunosuppression in cancer.
Dominant Negative (DN)
Certain missense mutations in the forkhead domain can exert dominant-negative effects by interfering with wild-type FOXP3 dimerization or DNA binding.
View complete mutation data：
Gene Ontology (GO)
| • DNA-binding transcription factor activity | • RNA polymerase II cis-regulatory region sequence-specific DNA binding |
| • protein homodimerization activity | • chromatin binding |
| • regulation of T cell proliferation | • negative regulation of inflammatory response |
| • T cell homeostasis | • immune tolerance |
Pathways
• Regulatory T cell differentiation
• T cell receptor signaling pathway
• Cytokine-cytokine receptor interaction
• PD-1 signaling
• TGF-beta signaling
Protein Summary
FOXP3 is a 431-amino acid protein (UniProt Q9BZS1) containing a forkhead DNA-binding domain, a zinc finger, and a leucine zipper. It forms homo-oligomers and interacts with other transcription factors (e.g., NFAT, Runx1) to regulate gene expression. FOXP3 is predominantly expressed in CD4+ CD25+ regulatory T cells, where it acts as a master regulator of their suppressive function. It controls the expression of genes involved in Treg function, including CTLA4, IL2RA, and IL10, while repressing effector cytokines like IL2 and IFNG. Post-translational modifications (e.g., acetylation, phosphorylation) modulate its stability and activity.
Related Services
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| FOXP3 Knockout HEK293 Cell Line | EDJ-KQ51265 | Human | 50943 | Details Get a Quote |
| FOXP3 Knockout HeLa Cell Line | EDJ-KQ56203 | Human | 50943 | Details Get a Quote |
| FOXP3 Knockout A-549 Cell Line | EDJ-KQ64693 | Human | 50943 | Details Get a Quote |
| FOXP3 Knockout HCT 116 Cell Line | EDJ-KQ73140 | Human | 50943 | Details Get a Quote |
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