GO:0072331 signal transduction by p53 class mediator: Tumor Suppression Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0072331 describes an intracellular signaling process induced by the p53 class mediator, a phosphoprotein that coordinates cell fate decisions.
• p53 class mediator signaling controls cell cycle arrest, senescence, ferroptosis, and metabolic stress responses through distinct downstream effectors.
• Key genes in this pathway include TP53, CDKN1A (p21), SLC7A11, ALOX12, CerS6, RUNX3, and CDK12.
• Dysregulation of p53 class mediator signaling is linked to cancer, lupus, doxorubicin-induced ovarian toxicity, and metabolic disorders.
• CRISPR knockout, point mutation, knock-in, and overexpression models are essential for dissecting causal roles of pathway components.
• EDITGENE provides end-to-end CRISPR cell model and library screening services to accelerate p53 signaling research.
Description
GO:0072331, signal transduction by p53 class mediator, is a biological process that encompasses the intracellular signaling events initiated by the p53 phosphoprotein or its functional equivalents. The p53 class mediator acts as a central hub that integrates diverse stress signals, including DNA damage, metabolic stress, and inflammatory cues, to orchestrate transcriptional and non-transcriptional responses that determine cell fate. This process is fundamental to tumor suppression, tissue homeostasis, and the response to genotoxic agents. Researchers study GO:0072331 to understand how p53 and its related proteins transmit signals that lead to cell cycle arrest, senescence, ferroptosis, or apoptosis, and how these outcomes can be harnessed or corrected in disease contexts. The pathway is highly context-dependent, with cell-type-specific effectors such as SLC7A11, ALOX12, and CerS6 mediating distinct metabolic and stress responses. Consequently, precise experimental models are required to map the signaling network and identify therapeutic targets.
signal transduction by p53 class mediator At A Glance
| GO ID | GO:0072331 |
|---|---|
| GO term | signal transduction by p53 class mediator |
| Ontology | biological_process |
| Synonym | None |
| Major function | Intracellular signaling induced by p53 or equivalent proteins to control cell fate |
| Key mediators | TP53, CDKN1A, SLC7A11, ALOX12, CerS6, RUNX3, CDK12 |
| Associated diseases | Cancer, lupus, ovarian toxicity, metabolic stress disorders |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, RNA-seq, proteomics |
What Is GO:0072331?
According to the Gene Ontology, GO:0072331 is defined as an intracellular signaling process that is induced by the cell cycle regulator phosphoprotein p53 or an equivalent protein. In other words, it covers the cascade of molecular events triggered by p53-class mediators that relay signals from stress sensors to downstream effectors, ultimately influencing cell cycle progression, survival, and death decisions.
Why Is signal transduction by p53 class mediator Important in Cell Biology?
GO:0072331 is critically important because p53 class mediator signaling is a central determinant of cell fate under stress, and its dysregulation contributes to cancer, autoimmune diseases, and metabolic disorders. Understanding this process provides mechanistic insights into how cells respond to DNA damage, oxidative stress, and inflammatory signals, and it informs the development of targeted therapies that modulate p53 pathway activity.
• Controls cell cycle arrest and senescence in response to DNA damage.
• Regulates ferroptosis via the p53-SLC7A11-ALOX12 axis in immune cells.
• Integrates sphingolipid signaling through p53-CerS6 interaction at the ER.
• Modulates ovarian protection against doxorubicin-induced toxicity.
• Influences therapeutic resistance and immune evasion in PIK3CA-driven cancers.
• Involved in hepatocellular carcinoma senescence through circLARP4/miR-761/RUNX3/p53/p21.
• Crosstalks with NF-κB signaling in inflammation and cancer.
• Serves as a target for radiosensitization via CDK12-BRCA1 axis.
• Provides biomarkers for lupus and metabolic stress responses.
• Enables CRISPR-based functional genomics to identify novel pathway components.
What Happens During signal transduction by p53 class mediator?
Stress Sensing and p53 Activation
In simple terms: When a cell experiences stress, p53 is switched on to send alarm signals.
Various stressors, including DNA damage, oxidative stress, and metabolic imbalance, trigger post-translational modifications of p53 that stabilize and activate it as a signaling mediator. This activation is a prerequisite for the downstream events of GO:0072331 and can be modulated by interacting proteins such as CerS6 at the endoplasmic reticulum.
Transcriptional and Non-Transcriptional Effector Cascades
In simple terms: Activated p53 then turns on or off specific genes and proteins that decide the cell's fate.
Once activated, p53 class mediator signaling induces transcriptional programs, including CDKN1A (p21) for cell cycle arrest and senescence, as well as non-transcriptional interactions that regulate ferroptosis through SLC7A11 and ALOX12. The choice between survival, senescence, and death is context-dependent and influenced by the cellular environment.
Metabolic and Sphingolipid Integration
In simple terms: p53 signaling also connects to how cells handle fats and other metabolites.
The p53-CerS6 interaction on the ER integrates p53 signaling with sphingolipid metabolism during metabolic stress, demonstrating that GO:0072331 extends beyond canonical DNA damage responses. This integration can alter cell survival and inflammatory outputs, linking the pathway to metabolic disorders.
Cell Fate Execution
In simple terms: The final outcome is that the cell either stops dividing, becomes senescent, or dies.
Downstream effectors of p53 class mediator signaling execute cell cycle arrest, senescence, ferroptosis, or apoptosis depending on the cellular context and the specific effectors engaged. For example, CDK12-BRCA1 signaling mediates radiosensitivity through p53-mediated cellular senescence, while circLARP4 induces senescence via the miR-761/RUNX3/p53/p21 axis.
Key Genes Involved in GO:0072331 signal transduction by p53 class mediator
The following genes and proteins are central to signal transduction by p53 class mediator, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TP53 | Encodes p53, the central mediator of the pathway | Most frequently mutated gene in cancer; target for CRISPR KO and point mutation studies |
| CDKN1A | p21, mediates cell cycle arrest downstream of p53 | Readout of p53 activity; senescence marker |
| SLC7A11 | Cystine/glutamate antiporter, regulated by p53 in ferroptosis | Ferroptosis induction in lupus B cells |
| ALOX12 | Lipoxygenase, executes ferroptosis downstream of p53 | Target for modulating ferroptosis in autoimmune disease |
| CerS6 | Ceramide synthase 6, interacts with p53 at ER | Links p53 to sphingolipid metabolism in metabolic stress |
| RUNX3 | Transcription factor regulated by p53/p21 axis | Senescence induction in hepatocellular carcinoma |
| CDK12 | Cyclin-dependent kinase 12, modulates BRCA1 and p53 senescence | Radiosensitization target |
| BRCA1 | DNA repair protein, part of CDK12-BRCA1-p53 axis | Mediates radiosensitivity and senescence |
| NF-κB | Inflammatory signaling crosstalk with p53 | Complex interplay in inflammation and cancer |
| miR-761 | MicroRNA regulating RUNX3/p53/p21 | Senescence regulation in HCC |
| circLARP4 | Circular RNA upstream of miR-761/RUNX3/p53 | Induces senescence in HCC |
| AMH | Anti-Müllerian hormone, protects ovary from doxorubicin | Regulates DNA damage response and p53 signaling |
| FGFR | Fibroblast growth factor receptor, crosstalk with p53 in resistance | Therapeutic resistance in endometrial cancer |
| PIK3CA | Oncogenic kinase, influences p53 pathway in endometrial cancer | Immune evasion and resistance |
| CX-5461 | p53 activator, triggers ferroptosis in lupus B cells | Pharmacological tool for p53 signaling |
| Dinaciclib | CDK inhibitor, activates p53-mediated senescence | Radiosensitizer |
| Doxorubicin | DNA damaging agent, activates p53 signaling | Ovarian toxicity model |
How Is signal transduction by p53 class mediator Regulated?
Signal transduction by p53 class mediator is tightly regulated at multiple levels. Post-translational modifications, protein-protein interactions, and metabolic cues modulate p53 stability and activity. For instance, the p53-CerS6 interaction on the ER integrates p53 and sphingolipid signaling pathways in metabolic stress response. Additionally, crosstalk with NF-κB signaling influences inflammatory and survival outcomes. The CDK12-BRCA1 axis modulates p53-mediated cellular senescence and radiosensitivity, highlighting kinase-dependent regulation. MicroRNAs such as miR-761 and circular RNAs like circLARP4 also regulate the pathway upstream of RUNX3/p53/p21.
signal transduction by p53 class mediator and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TP53 | Cancer, Li-Fraumeni syndrome | CRISPR knockout and point mutation in cancer cell lines |
| SLC7A11 | Lupus, ferroptosis | Knockout or overexpression in B cells |
| CerS6 | Metabolic stress, sphingolipid disorders | Knock-in of interaction-deficient mutants |
| CDK12 | Cancer radiosensitivity | Knockout and overexpression in tumor cells |
| RUNX3 | Hepatocellular carcinoma | Knockout and rescue with p21 |
Cancer
Dysregulation of GO:0072331 is a hallmark of many cancers. TP53 mutations disrupt p53 class mediator signaling, leading to uncontrolled proliferation and resistance to therapy. In hepatocellular carcinoma, circLARP4 induces senescence through the miR-761/RUNX3/p53/p21 axis, suggesting that restoring this pathway could suppress tumor growth. In PIK3CA-driven endometrial cancer, targeting FGFR signaling overcomes therapeutic resistance and immune evasion, partly through p53-related mechanisms. CDK12-BRCA1 signaling mediates radiosensitivity via p53-mediated senescence, providing a rationale for combining CDK inhibitors with radiotherapy.
Autoimmune and Inflammatory Diseases
In lupus-prone mice, CX-5461 ameliorates disease by triggering B-cell ferroptosis via the p53-SLC7A11-ALOX12 pathway, demonstrating a role for p53 class mediator signaling in autoimmune pathology. The complexity of NF-κB signaling in inflammation and cancer further underscores the crosstalk between p53 and inflammatory pathways.
Metabolic and Reproductive Toxicity
AMH protects the ovary from doxorubicin by regulating cell fate and the DNA damage response, which involves p53 signaling. The p53-CerS6 interaction integrates p53 and sphingolipid signaling in metabolic stress, linking the pathway to metabolic disorders.
From signal transduction by p53 class mediator-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of TP53 abolish p53 class mediator signaling? | CRISPR knockout of TP53 in cancer cell lines |
| How do point mutations in TP53 affect downstream ferroptosis? | CRISPR point mutation knock-in of TP53 mutants |
| Can restoring p53 activity induce senescence in HCC? | Knock-in of wild-type TP53 or overexpression of circLARP4 |
| What is the role of CerS6 in p53-mediated metabolic stress? | Knock-in of tagged CerS6 for interaction studies |
| Does CDK12 inhibition radiosensitize via p53? | CRISPR knockout of CDK12 and p53 in combination |
| How does AMH protect against doxorubicin toxicity? | Overexpression of AMH in ovarian cells |
How to Study the signal transduction by p53 class mediator Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptional changes | Identify p53 target genes and pathway activation |
| Proteomics | Protein abundance and modifications | Map signaling networks and interactions |
| CRISPR screen | Gene function at scale | Discover novel regulators of p53 signaling |
| Live-cell imaging | p53 dynamics and cell fate | Monitor senescence and ferroptosis |
| Co-IP / PLA | Protein-protein interactions | Study p53-CerS6 and other complexes |
| Ferroptosis assays | Lipid peroxidation and cell death | Evaluate SLC7A11/ALOX12 axis |
| Senescence assays | Beta-galactosidase activity | Measure p53-mediated senescence |
| Reporter assays | Transcriptional activity | Quantify p53-dependent promoters |
Transcriptomic and Proteomic Profiling
RNA-seq and proteomics can map the transcriptional and protein-level changes induced by p53 class mediator signaling, identifying downstream effectors such as CDKN1A, SLC7A11, and ALOX12. These methods are essential for defining the pathway's context-specific outputs.
Functional Genomics with CRISPR Screens
CRISPR library screening enables unbiased discovery of genes that modulate p53 class mediator signaling, including novel regulators of ferroptosis and senescence. This approach can identify synthetic lethal interactions and resistance mechanisms.
Imaging and Cell Fate Assays
Live-cell imaging of p53 dynamics, senescence-associated beta-galactosidase staining, and ferroptosis detection assays (e.g., lipid peroxidation) are used to monitor cell fate decisions downstream of GO:0072331.
Interaction and Modification Studies
Co-immunoprecipitation, proximity ligation, and mass spectrometry can reveal protein-protein interactions such as p53-CerS6 and post-translational modifications that regulate the pathway.
How CRISPR Can Be Used to Study GO:0072331 signal transduction by p53 class mediator
Knockout
CRISPR knockout of TP53, CDKN1A, SLC7A11, or CDK12 allows researchers to test their causal roles in p53 class mediator signaling and downstream phenotypes such as ferroptosis and senescence. Knockout models are essential for validating pathway dependencies.
Point Mutation
Introducing disease-relevant point mutations (e.g., TP53 R175H or R273H) via CRISPR base editing or HDR enables precise dissection of how specific mutations alter signal transduction by p53 class mediator. Such models mimic clinical mutations and reveal gain-of-function or loss-of-function effects.
Knock-in
Knock-in of tagged proteins (e.g., CerS6-FLAG) or reporter cassettes (e.g., p21-luciferase) facilitates real-time monitoring of pathway activity and interaction studies. Knock-in models also allow expression of mutant proteins at physiological levels.
Overexpression
Overexpression of wild-type p53, circLARP4, or AMH can activate or modulate the pathway to study downstream effects such as senescence and protection from DNA damage. Overexpression models are useful for gain-of-function studies and therapeutic target validation.
How EDITGENE Supports signal transduction by p53 class mediator Research
Researchers studying signal transduction by p53 class mediator-related genes often need to determine whether a candidate gene is causally involved in pathway regulation or is merely a bystander. EDITGENE provides the necessary CRISPR tools and services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for signal transduction by p53 class mediator research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| TP53 Knockout HCT 116 Cell Line | EDC07854 | Human | 7157 | Details Get a Quote |
| CDKN1A Knockout HEK293 Cell Line | EDJ-KQ129 | Human | 1026 | Details Get a Quote |
| GREM1 Knockout HEK293 Cell Line | EDJ-KQ381 | Human | 26585 | Details Get a Quote |
| MAGEA2B Knockout HEK293 Cell Line | EDJ-KQ13384 | Human | 266740 | Details Get a Quote |
| TP53 Knockout HEK293 Cell Line | EDJ-KQ17910 | Human | 7157 | Details Get a Quote |
| TP53 Knockout hTERT-RPE1 Cell Line | EDC00205 | Human | 7157 | Details Get a Quote |
| TP53 Knockout HeLa Cell Line | EDJ-KQ18086 | Human | 7157 | Details Get a Quote |
| TP53 Knockout A-549 Cell Line | EDJ-KQ18198 | Human | 7157 | Details Get a Quote |
| MAGEA2B Knockout HCT 116 Cell Line | EDJ-KQ44104 | Human | 266740 | Details Get a Quote |
| CDKN1A Knockout HeLa Cell Line | EDJ-KQ18296 | Human | 1026 | Details Get a Quote |
| GREM1 Knockout A-549 Cell Line | EDJ-KQ18586 | Human | 26585 | Details Get a Quote |
| GREM1 Knockout HeLa Cell Line | EDJ-KQ18587 | Human | 26585 | Details Get a Quote |
| CDKN1A Knockout A-549 Cell Line | EDJ-KQ18755 | Human | 1026 | Details Get a Quote |
| CDKN1A Knockout HCT 116 Cell Line | EDJ-KQ18757 | Human | 1026 | Details Get a Quote |
| MAGEA2 Knockout HEK293 Cell Line | EDJ-KQ50426 | Human | 4101 | Details Get a Quote |
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Frequently Asked Questions About signal transduction by p53 class mediator
What is GO:0072331 signal transduction by p53 class mediator?
GO:0072331 is a Gene Ontology biological process defined as an intracellular signaling process induced by the cell cycle regulator phosphoprotein p53 or an equivalent protein.
What genes are involved in signal transduction by p53 class mediator?
Key genes include TP53, CDKN1A, SLC7A11, ALOX12, CerS6, RUNX3, CDK12, and BRCA1, among others.
How does p53 class mediator signaling induce ferroptosis?
p53 activation represses SLC7A11 and activates ALOX12, leading to lipid peroxidation and ferroptosis in cells such as B cells.
What diseases are associated with p53 class mediator signaling?
Dysregulation is linked to cancer, lupus, ovarian toxicity from doxorubicin, and metabolic stress disorders.
How can CRISPR be used to study p53 signaling?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of pathway components and their roles in cell fate.
What is the role of CerS6 in p53 signaling?
CerS6 interacts with p53 at the endoplasmic reticulum to integrate p53 and sphingolipid signaling during metabolic stress.
How does CDK12 regulate p53-mediated senescence?
CDK12 modulates BRCA1 signaling, which affects p53-mediated cellular senescence and radiosensitivity.
What is the p53-SLC7A11-ALOX12 pathway?
It is a signaling axis through which p53 induces ferroptosis by suppressing SLC7A11 and activating ALOX12.
Can p53 signaling be targeted for cancer therapy?
Yes, targeting components such as CDK12 or restoring p53 function via compounds like CX-5461 is being explored in preclinical models.
What methods are used to study signal transduction by p53 class mediator?
Common methods include RNA-seq, proteomics, CRISPR screens, live-cell imaging, and interaction assays.
Conclusion
GO:0072331 signal transduction by p53 class mediator is a central biological process that governs cell fate decisions under stress. Its dysregulation contributes to cancer, autoimmune diseases, and metabolic disorders, making it a prime target for therapeutic intervention. Advances in CRISPR-based models and functional genomics are accelerating the discovery of novel pathway components and drug targets. EDITGENE's comprehensive services support researchers in building precise cell models to dissect this critical signaling network.
References
- 1. Wu Y et al.. 2024. CX-5461 ameliorates disease in lupus-prone mice by triggering B-cell ferroptosis via p53-SLC7A11-ALOX12 pathway.. Free Radic Biol Med 223:325-340 PMID: 39111584
- 2. Hoesel B et al.. 2013. The complexity of NF-κB signaling in inflammation and cancer.. Mol Cancer 12:86 PMID: 23915189
- 3. Nguyen NMP et al.. 2025. AMH protects the ovary from doxorubicin by regulating cell fate and the response to DNA damage.. Proc Natl Acad Sci U S A 122(5):e2414734122 PMID: 39874288
- 5. Flores NG et al.. 2025. The CDK12-BRCA1 signaling axis mediates dinaciclib-associated radiosensitivity through p53-mediated cellular senescence.. Mol Oncol 19(4):1265-1280 PMID: 39626031
- 6. Cheng X et al.. 2026. Targeting FGFR signaling overcomes therapeutic resistance and immune evasion in oncogenic PIK3CA-driven serous-like endometrial cancer.. Nat Commun 17(1) PMID: 42082487
- 7. Childress MS et al.. 2026. The p53-CerS6 interaction on the ER integrates p53 and sphingolipid signaling pathways in metabolic stress response.. J Lipid Res 67(8):101097 PMID: 42425489
- 8. Chen Z et al.. 2019. circLARP4 induces cellular senescence through regulating miR-761/RUNX3/p53/p21 signaling in hepatocellular carcinoma.. Cancer Sci 110(2):568-581 PMID: 30520539
