GO:1901797 negative regulation of 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:1901797 describes any process that stops, prevents, or reduces signal transduction mediated by p53-class proteins, including p53, p73, and p63.
• The p53 family integrates diverse stress signals, and its negative regulation is critical for preventing inappropriate activation of apoptosis, senescence, and cell-cycle arrest.
• Key negative regulators include SIRT1, which deacetylates p53 and dampens its transcriptional activity, and TAp73, which represses NF-kB signaling and tumor-associated macrophage recruitment.
• Dysregulation of this process is implicated in cancer, where loss of negative control can promote tumorigenesis, and in other diseases such as metabolic disorders and neurodegeneration.
• Experimental models for studying GO:1901797 include CRISPR knockout, point mutation, knock-in, and overexpression cell lines, as well as computational and systems biology approaches.
• Understanding this term aids in identifying therapeutic targets, as modulating p53-class signal transduction can influence cancer progression and treatment response.
Description
The p53 protein family, comprising p53, p73, and p63, plays a central role in cellular stress responses, orchestrating processes such as DNA repair, cell cycle arrest, senescence, and apoptosis. The signal transduction mediated by these proteins must be tightly controlled to avoid unintended cellular outcomes. GO:1901797, negative regulation of signal transduction by p53 class mediator, encompasses any process that stops, prevents, or reduces the frequency, rate, or extent of signal transduction by p53 class mediator. This regulation is essential for maintaining cellular homeostasis and preventing diseases like cancer. Researchers study this term to understand how cells fine-tune p53 family activity, which has implications for cancer therapy, aging, and metabolic regulation. The negative regulation can occur at multiple levels, including post-translational modifications, protein-protein interactions, and transcriptional feedback loops. For example, SIRT1 deacetylates p53, reducing its transcriptional activity and promoting cell survival under certain conditions. Similarly, TAp73, a p53 family member, can repress NF-kB signaling, thereby limiting inflammatory responses and tumor progression. These examples highlight the diversity of mechanisms that negatively regulate p53-class signal transduction. Understanding GO:1901797 is therefore crucial for deciphering how cells balance pro-survival and pro-death signals, and for developing interventions that target these pathways in disease.
negative regulation of signal transduction by p53 class mediator At A Glance
| GO ID | GO:1901797 |
|---|---|
| GO term | negative regulation of signal transduction by p53 class mediator |
| Ontology | biological_process |
| Synonym | down regulation of signal transduction by p53 class mediator, down-regulation of signal transduction by p53 class mediator, downregulation of signal transduction by p53 class mediator, inhibition of signal transduction by p53 class mediator |
| Major function | To stop, prevent, or reduce signal transduction mediated by p53-class proteins, thereby modulating cellular responses to stress. |
| Related genes | TP53, TP73, TP63, SIRT1, MDM2, MDM4, and others. |
| Associated diseases | Cancer, metabolic disorders, neurodegenerative conditions. |
| Research methods | CRISPR knockout, point mutation, knock-in, overexpression, RNA-seq, proteomics, computational modeling. |
What Is GO:1901797?
GO:1901797 is a biological process term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of signal transduction by p53 class mediator. In simpler terms, it refers to the cellular mechanisms that put the brakes on signaling pathways driven by p53 and its family members (p53, p73, p63), ensuring that these powerful pathways are not activated inappropriately.
Why Is negative regulation of signal transduction by p53 class mediator Important in Cell Biology?
GO:1901797 is important because the p53 family of transcription factors governs critical decisions between cell survival and death, and their negative regulation is essential to prevent aberrant signaling that can lead to cancer, developmental defects, and other pathologies. Understanding how p53-class signal transduction is dampened provides insights into tumor suppression mechanisms, therapeutic resistance, and potential targets for drug development.
• Prevents inappropriate activation of p53-mediated apoptosis and senescence, which could damage tissues.
• Modulates the response to DNA damage and oncogenic stress, influencing cancer development.
• Regulates inflammatory signaling through p53 family members like TAp73, affecting tumor microenvironment.
• Impacts metabolic pathways, as p53-class mediators intersect with fatty acid biosynthesis and Wnt signaling.
• Plays a role in stem cell regulation and neural progenitor function.
• Involved in chemical risk assessment for breast cancer based on gene expression profiles.
• Single nucleotide polymorphisms in regulators like HIC1 can affect p53 signaling.
• Protein tyrosine kinases such as p53/56lyn and p72syk participate in MHC class I-mediated signal transduction, linking to immune responses.
• Calcium/calmodulin-dependent protein kinase 1 (CAMK1) signaling intersects with p53 pathways in hepatocellular carcinoma.
• Provides potential targets for therapeutic intervention in cancers with wild-type or mutant p53.
What Happens During negative regulation of signal transduction by p53 class mediator?
Post-translational modification of p53 family proteins
In simple terms: Chemical tags are added to or removed from p53 proteins to switch their activity down.
Negative regulation often involves post-translational modifications such as deacetylation, phosphorylation, or ubiquitination that reduce the stability or transcriptional activity of p53-class mediators. For instance, SIRT1 deacetylates p53 at specific lysine residues, leading to decreased p53 transcriptional activity and promoting cell survival under stress. This modification can alter p53's ability to bind DNA and activate target genes, effectively dampening the signal transduction cascade.
Protein-protein interactions that sequester or inhibit p53 family members
In simple terms: Other proteins bind to p53 and block its ability to send signals.
Proteins such as MDM2 and MDM4 can bind directly to p53 and inhibit its transcriptional activity, promoting its degradation. Although not cited in the provided list, this is a well-known mechanism. Within the cited literature, TAp73 represses NF-kB-mediated recruitment of tumor-associated macrophages, illustrating how p53 family members can negatively regulate other signaling pathways. This interaction highlights the cross-talk between p53-class mediators and inflammatory signaling.
Transcriptional feedback loops
In simple terms: p53 turns on genes that then turn p53 off, creating a self-limiting loop.
p53 activation leads to the transcription of its own negative regulators, such as MDM2, forming an autoregulatory feedback loop. This ensures that p53 signaling is transient and reversible. While specific citations for this loop are not in the provided list, the concept is supported by the general understanding of p53 biology. SIRT1, for example, is a p53 target gene that deacetylates p53, contributing to a negative feedback mechanism.
Regulation by non-coding RNAs and other modulators
In simple terms: Small RNA molecules and other factors can fine-tune p53 signaling.
MicroRNAs and long non-coding RNAs can negatively regulate p53-class signal transduction by targeting components of the pathway. For instance, miR-34a, a p53 target, can downregulate SIRT1, creating a positive feedback loop that enhances p53 activity. Conversely, other microRNAs may inhibit p53. The provided citations do not directly address non-coding RNAs, but the broader literature supports their role. The computational analysis of SNPs in HIC1, a transcriptional repressor that interacts with p53, suggests genetic variations can impact this regulation.
Integration with other signaling pathways
In simple terms: p53 signaling is influenced by cross-talk with other cellular pathways.
Negative regulation of p53-class signal transduction often occurs through integration with other pathways. For example, CAMK1 phosphoinositide signaling is involved in protein sorting and transport in hepatocellular carcinoma, potentially intersecting with p53 pathways. Similarly, PTHLH coupling with Wnt receptor signaling and fatty acid biosynthesis has been analyzed in systems-theoretical models, indicating complex network interactions. These cross-talks can modulate the intensity and duration of p53 signals.
Key Genes Involved in GO:1901797 negative regulation of signal transduction by p53 class mediator
The following genes and proteins are key players in the negative regulation of signal transduction by p53 class mediator, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TP53 | Tumor suppressor, transcription factor that mediates stress responses | Central mediator; its negative regulation is critical for preventing excessive apoptosis. |
| SIRT1 | NAD+-dependent deacetylase that deacetylates p53, reducing its activity | Modulates p53-dependent senescence and cancer. |
| TP73 | p53 family member; TAp73 represses NF-kB signaling | Regulates tumor-associated macrophages and inflammation in breast cancer. |
| TP63 | p53 family member involved in development and differentiation | Not directly cited but part of p53 class mediator family. |
| MDM2 | E3 ubiquitin ligase that targets p53 for degradation | Well-known negative regulator; not in citation list but implied by p53 biology. |
| MDM4 | Inhibitor of p53 transcriptional activity | Similar to MDM2; not directly cited. |
| HIC1 | Transcriptional repressor that interacts with p53 | SNPs in HIC1 may affect p53 signaling. |
| CAMK1 | Calcium/calmodulin-dependent protein kinase 1 | Involved in phosphoinositide signaling in HCC, potential cross-talk with p53. |
| PTHLH | Parathyroid hormone-like hormone | Couples with Wnt receptor signaling and fatty acid biosynthesis in HCC. |
| p53/56lyn | Protein tyrosine kinase | Participates in MHC class I-mediated signal transduction in B lymphoma cells. |
| p72syk | Protein tyrosine kinase | Participates in MHC class I-mediated signal transduction in B lymphoma cells. |
| Neural stem cells | Regulated by intracellular signal transduction | Specific features of signal transduction in neural stem cells and progenitors. |
| Committed neuronal progenitors | Regulated by intracellular signal transduction | Specific features of signal transduction in neural stem cells and progenitors. |
| Chemical risk factors | Gene expression profiles associated with breast cancer | Assessment of chemical risk factor for breast cancer. |
| Wnt receptor | Signaling pathway component | Coupled with PTHLH and fatty acid biosynthesis in HCC. |
| Peptidase activity | Induced apoptosis network | Downstream of PTHLH and Wnt signaling in HCC. |
| Fatty acid biosynthesis | Metabolic pathway | Upstream negative regulation by PTHLH in HCC. |
How Is negative regulation of signal transduction by p53 class mediator Regulated?
The negative regulation of p53-class signal transduction is itself tightly regulated by various mechanisms. SIRT1, a NAD+-dependent deacetylase, is a key regulator that deacetylates p53 and reduces its transcriptional activity, thereby acting as a negative regulator. The activity of SIRT1 is influenced by cellular NAD+ levels, linking p53 regulation to cellular metabolism. Additionally, TAp73 can repress NF-kB signaling, which in turn affects the tumor microenvironment and inflammatory responses. Other pathways, such as CAMK1 phosphoinositide signaling, may also modulate p53 activity through protein sorting and transport mechanisms. Furthermore, computational analyses of gene expression profiles have identified chemical risk factors that may impact p53-related signaling in breast cancer. These regulatory layers ensure that p53-class signal transduction is appropriately dampened when necessary.
negative regulation of signal transduction by p53 class mediator and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TP53 | Cancer, Li-Fraumeni syndrome | Knockout and point mutation cell lines (e.g., HCT116 p53-/-). |
| SIRT1 | Cancer, aging, metabolic disorders | Overexpression and knockout models to study deacetylation of p53. |
| TP73 | Breast cancer, inflammation | Knockdown or knockout in breast cancer cell lines to assess NF-kB signaling. |
| HIC1 | Cancer, epigenetic regulation | SNP knock-in models to study interaction with p53. |
| CAMK1 | Hepatocellular carcinoma | Knockout or overexpression in HCC cell lines to study phosphoinositide signaling. |
Cancer
Dysregulation of negative regulation of p53-class signal transduction is frequently observed in cancer. Loss of negative regulators such as SIRT1 can lead to hyperactive p53 signaling, which may promote premature aging or tissue degeneration, while excessive negative regulation can allow damaged cells to survive and proliferate, contributing to tumorigenesis. In breast cancer, TAp73-mediated repression of NF-kB signaling affects the recruitment of tumor-associated macrophages, influencing tumor progression. Additionally, chemical risk factors for breast cancer have been assessed using gene expression profiles, highlighting the interplay between environmental exposures and p53-related pathways.
Metabolic disorders
The p53 family intersects with metabolic pathways, including fatty acid biosynthesis and Wnt signaling. In hepatocellular carcinoma, PTHLH couples upstream negative regulation of fatty acid biosynthesis and Wnt receptor signaling to downstream peptidase activity-induced apoptosis networks. This suggests that negative regulation of p53-class signal transduction may influence metabolic reprogramming in cancer and potentially in metabolic disorders.
Neurological conditions
Intracellular signal transduction in neural stem cells and committed neuronal progenitors has specific features that may involve p53-class mediators. Negative regulation of these pathways is crucial for proper brain development and function, and its dysregulation could contribute to neurodegenerative diseases or impaired neurogenesis.
Immune and inflammatory diseases
Protein tyrosine kinases p53/56lyn and p72syk are involved in MHC class I-mediated signal transduction in B lymphoma cells, indicating a role for p53-class mediators in immune signaling. Negative regulation of these pathways may affect immune responses and inflammatory conditions.
From negative regulation of signal transduction by p53 class mediator-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SIRT1 deacetylation of p53 negatively regulate its transcriptional activity? | SIRT1 knockout and overexpression cell lines, p53 acetylation mutants. |
| How does TAp73 repress NF-kB signaling in breast cancer? | TAp73 knockout or knockdown in breast cancer cell lines, macrophage co-culture. |
| What is the impact of HIC1 SNPs on p53 signaling? | CRISPR knock-in of SNPs in HIC1 in cell lines, followed by p53 reporter assays. |
| Does CAMK1 modulate p53-dependent apoptosis in HCC? | CAMK1 knockout and overexpression in HCC cell lines, apoptosis assays. |
| How does PTHLH affect Wnt signaling and fatty acid biosynthesis? | PTHLH knockout in HCC cells, systems-theoretical analysis. |
| What are the features of p53-class signal transduction in neural stem cells? | Neural stem cell cultures from knockout mice, signal transduction profiling. |
How to Study the negative regulation of signal transduction by p53 class mediator Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screening | Loss-of-function phenotypes for all genes | Identify negative regulators of p53 signaling. |
| RNA-seq | Transcriptome changes | Assess gene expression after p53 modulation. |
| Proteomics | Protein abundance and modifications | Detect p53 acetylation status. |
| Computational modeling | Network interactions and predictions | Analyze PTHLH/Wnt/fatty acid networks. |
| Immunoprecipitation | Protein-protein interactions | Study SIRT1-p53 binding. |
| Reporter assays | p53 transcriptional activity | Measure negative regulation in live cells. |
| Single-cell imaging | Heterogeneous p53 dynamics | Observe cell-to-cell variability. |
| SNP genotyping | Genetic variants in regulators | Assess HIC1 SNPs impact. |
CRISPR-based genetic screens
CRISPR knockout and activation screens can identify genes that negatively regulate p53-class signal transduction. By systematically perturbing genes and measuring p53 reporter activity or downstream phenotypes, researchers can uncover novel regulators. This approach is powerful for unbiased discovery and has been applied to various cancer models.
Transcriptomics and proteomics
RNA sequencing (RNA-seq) and mass spectrometry-based proteomics can reveal changes in gene expression and protein modifications following manipulation of p53-class signaling. For example, deacetylation of p53 by SIRT1 can be detected by immunoprecipitation followed by mass spectrometry. Transcriptomic profiling of breast cancer cells with altered TAp73 levels has provided insights into NF-kB target genes.
Computational and systems biology
Systems-theoretical analysis and computational modeling are valuable for understanding the complex networks involving p53-class signal transduction. For instance, PTHLH coupling with Wnt signaling and fatty acid biosynthesis has been analyzed using biocomputation. Similarly, assessment of chemical risk factors for breast cancer based on gene expression profiles employs computational methods.
Imaging and single-cell approaches
Live-cell imaging of p53 dynamics and single-cell analysis can reveal heterogeneity in negative regulation. Fluorescently tagged p53 or reporters of p53 activity allow real-time monitoring of signal transduction. These methods can be combined with CRISPR editing to study the effects of specific mutations.
How CRISPR Can Be Used to Study GO:1901797 negative regulation of signal transduction by p53 class mediator
Knockout
CRISPR knockout of negative regulators such as SIRT1 or TAp73 can be used to study their role in p53-class signal transduction. For example, SIRT1 knockout cells exhibit increased p53 acetylation and activity, leading to enhanced apoptosis or senescence. Similarly, TAp73 knockout in breast cancer cells may result in increased NF-kB signaling and altered macrophage recruitment. These models help establish causality.
Point Mutation
Introducing point mutations in p53 acetylation sites (e.g., K382R) using CRISPR can prevent SIRT1-mediated deacetylation, thereby constitutively activating p53. Such models are invaluable for dissecting the specific contributions of individual modifications to negative regulation. Point mutations in HIC1 identified from SNP analysis can also be engineered to study their impact on p53 signaling.
Knock-in
Knock-in of tagged versions of p53 or its regulators (e.g., GFP-p53) allows for real-time imaging and biochemical analysis of signal transduction. Additionally, knock-in of disease-associated SNPs in genes like HIC1 can model genetic susceptibility. These models provide physiological relevance.
Overexpression
Overexpression of negative regulators such as SIRT1 or MDM2 can suppress p53 signaling, mimicking conditions where p53 is inappropriately dampened. This is useful for studying cancer cell survival and drug resistance. Conversely, overexpression of p53 family members like TAp73 can enhance negative regulation of NF-kB.
How EDITGENE Supports negative regulation of signal transduction by p53 class mediator Research
Researchers studying negative regulation of signal transduction by p53 class mediator-related genes often need to determine whether a candidate gene is causally involved in dampening p53 signaling, and to dissect the precise molecular mechanisms. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such investigations, from gene knockout to precise point mutations and knock-in models, as well as high-throughput screening and bioinformatics support.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of signal transduction by p53 class mediator research.
Frequently Asked Questions About negative regulation of signal transduction by p53 class mediator
What is GO:1901797?
GO:1901797 is a Gene Ontology term for any process that stops, prevents, or reduces the frequency, rate, or extent of signal transduction by p53 class mediator.
What genes are involved in negative regulation of signal transduction by p53 class mediator?
Key genes include TP53, SIRT1, TP73, HIC1, and CAMK1, among others.
How does SIRT1 negatively regulate p53 signaling?
SIRT1 deacetylates p53, reducing its transcriptional activity and promoting cell survival.
What is the role of TAp73 in p53-class signal transduction?
TAp73 can repress NF-kB-mediated recruitment of tumor-associated macrophages in breast cancer.
Why is negative regulation of p53 signaling important in cancer?
It prevents excessive p53 activity that could damage tissues, but its dysregulation can allow cancer cells to survive.
What experimental models are used to study GO:1901797?
CRISPR knockout, point mutation, knock-in, overexpression cell lines, and computational models are commonly used.
How can CRISPR screening identify regulators of p53 signaling?
Genome-wide knockout or activation screens can pinpoint genes that modulate p53 activity when perturbed.
What diseases are associated with dysregulation of p53-class signal transduction?
Cancer, metabolic disorders, and neurological conditions have been linked to altered p53 signaling.
What is the connection between HIC1 SNPs and p53 signaling?
Single nucleotide polymorphisms in HIC1 may affect its function as a transcriptional repressor interacting with p53.
How does CAMK1 influence p53-related pathways?
CAMK1 phosphoinositide signaling is involved in protein sorting and transport in hepatocellular carcinoma, potentially cross-talking with p53.
Conclusion
GO:1901797, negative regulation of signal transduction by p53 class mediator, is a critical biological process that ensures the proper control of p53 family signaling. Through mechanisms such as deacetylation by SIRT1, repression of NF-kB by TAp73, and integration with metabolic and immune pathways, cells finely tune p53 activity to balance survival and death decisions. Dysregulation of this process contributes to cancer, metabolic disorders, and neurological conditions, making it a compelling area of research. Advances in CRISPR-based models and computational analysis continue to unravel the complex networks involved, offering potential therapeutic targets. EDITGENE stands ready to support these investigations with tailored gene editing services.
References
- 1. Huang J et al.. 2012. PTHLH coupling upstream negative regulation of fatty acid biosynthesis and Wnt receptor signal to downstream peptidase activity-induced apoptosis network in human hepatocellular carcinoma by systems-theoretical analysis.. J Recept Signal Transduct Res 32(5):250-6 PMID: 22799769
- 2. Zyuz'kov GN et al.. 2021. Specific Features of Intracellular Signal Transduction in the Regulation of Functions of Neural Stem Cells and Committed Neuronal Progenitors.. Bull Exp Biol Med 170(4):522-527 PMID: 33725249
- 3. Yi J et al.. 2010. SIRT1 and p53, effect on cancer, senescence and beyond.. Biochim Biophys Acta 1804(8):1684-9 PMID: 20471503
- 4. Achebouche R et al.. 2025. Assessment of chemical risk factor for breast cancer based on gene expression profiles.. Sci Rep 15(1):43983 PMID: 41408116
- 5. Annanya A et al.. 2024. Computational Analysis of Single Nucleotide Polymorphisms in Human HIC1 Gene.. Cureus 16(3):e56664 PMID: 38646326
- 6. Wolfsberger J et al.. 2021. TAp73 represses NF-κB-mediated recruitment of tumor-associated macrophages in breast cancer.. Proc Natl Acad Sci U S A 118(10) PMID: 33649219
- 7. Pedersen AE et al.. 1998. Protein tyrosine kinases p53/56lyn and p72syk in MHC class I-mediated signal transduction in B lymphoma cells.. Exp Cell Res 240(1):144-50 PMID: 9570929
- 8. Wang L et al.. 2014. CAMK1 phosphoinositide signal-mediated protein sorting and transport network in human hepatocellular carcinoma (HCC) by biocomputation.. Cell Biochem Biophys 70(2):1011-6 PMID: 24825433
