GO:1902167 positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator: Apoptosis Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902167 describes the biological process that activates or increases the intrinsic apoptotic signaling pathway specifically triggered by DNA damage and mediated by p53 class mediators.
• The term is a child of positive regulation of intrinsic apoptotic signaling pathway and is defined by QuickGO as any process that activates or increases the frequency, rate or extent of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator.
• Key molecular players include TP53, HIC1, and AMH, which influence DNA damage responses and cell fate decisions.
• Dysregulation of this pathway is linked to cancer, where loss of p53-mediated apoptosis promotes tumorigenesis, and to chemoresistance in ovarian cancer models.
• CRISPR knockout, point mutation, and knock-in models are essential to dissect the causal roles of genes such as HIC1 and AMH in this pathway.
• Understanding this process aids in identifying therapeutic targets for cancers with defective p53 signaling and for protecting normal tissues from DNA-damaging agents.
Description
The Gene Ontology term GO:1902167, positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator, defines a critical cellular process that ensures damaged cells are eliminated to prevent malignant transformation. This process is a subset of the broader intrinsic apoptotic signaling pathway, where DNA damage triggers a p53-dependent cascade that activates pro-apoptotic effectors. Researchers study this term to understand how cells decide between survival and death after genotoxic stress, and how disruptions contribute to diseases such as cancer. The pathway is highly regulated and involves multiple genes and proteins that sense DNA damage, stabilize p53, and execute apoptosis. In cancer biology, the ability of p53 to induce apoptosis is a major barrier to tumor development, and its inactivation is a common event in many malignancies. Moreover, recent studies highlight the role of factors like AMH in modulating DNA damage responses in ovarian cells, linking this pathway to chemoprotection. Thus, GO:1902167 represents a convergence point for DNA repair, cell cycle checkpoints, and cell death, making it a focal point for therapeutic interventions.
positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator At A Glance
| GO ID | GO:1902167 |
|---|---|
| GO term | positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator |
| Ontology | biological_process |
| Synonym | activation of DNA damage response, signal transduction by p53 class mediator resulting in induction of apoptosis; upregulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator |
| Major function | Enhances p53-mediated intrinsic apoptosis following DNA damage |
| Parent term | positive regulation of intrinsic apoptotic signaling pathway |
| Related process | DNA damage response, p53 signaling, apoptosis |
| Cellular context | Nucleus, cytoplasm, mitochondria |
What Is GO:1902167?
GO:1902167 is a biological process term that encompasses any process which activates or increases the frequency, rate, or extent of the intrinsic apoptotic signaling pathway in response to DNA damage, specifically when mediated by p53 class mediators. In simpler terms, it is the positive regulation of the cell's self-destruction program that is triggered by DNA damage and requires p53 or related proteins. This term is a child of positive regulation of intrinsic apoptotic signaling pathway and is distinct from extrinsic apoptotic pathways. The definition emphasizes the p53 class mediator, meaning that the apoptotic response is dependent on p53 or its family members.
Why Is positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator Important in Cell Biology?
GO:1902167 is important because it represents a key tumor-suppressive mechanism that eliminates cells with irreparable DNA damage, thereby preventing cancer. Defects in this pathway lead to the survival of damaged cells, genomic instability, and tumor progression. Additionally, modulating this pathway can protect normal tissues from chemotherapy-induced damage, as seen with AMH in ovarian protection. Therefore, understanding its regulation offers opportunities for cancer therapy and chemoprevention.
• Prevents tumorigenesis by eliminating cells with DNA damage.
• Loss of p53-mediated apoptosis is a hallmark of many cancers.
• Modulation of this pathway can protect normal tissues from DNA-damaging agents.
• HIC1 genetic variants may affect DNA damage response and apoptosis.
• AMH signaling influences cell fate and DNA damage response in ovarian cells.
• The pathway is a target for chemosensitization and chemoprotection strategies.
• Understanding it aids in predicting responses to radiotherapy and chemotherapy.
• It links DNA repair, cell cycle checkpoints, and apoptosis.
• Animal models with mutations in this pathway help study disease mechanisms.
• CRISPR screens can identify novel regulators of this process.
What Happens During positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator?
DNA Damage Sensing and p53 Activation
In simple terms: When DNA is damaged, sensor proteins alert the cell and activate p53.
Upon DNA damage, sensor kinases such as ATM and ATR are activated, leading to phosphorylation and stabilization of p53. This activation is a prerequisite for the p53 class mediator to initiate the apoptotic program. The process is tightly regulated to ensure that only cells with severe damage undergo apoptosis.
Transcriptional Activation of Pro-apoptotic Genes
In simple terms: Active p53 turns on genes that promote cell death.
Activated p53 functions as a transcription factor that upregulates pro-apoptotic genes such as BAX, PUMA, and NOXA. These genes are critical for the intrinsic apoptotic pathway, as they permeabilize mitochondria and release cytochrome c. The positive regulation of this pathway by p53 class mediators is essential for the apoptotic response.
Mitochondrial Outer Membrane Permeabilization
In simple terms: The mitochondria become leaky, releasing factors that trigger cell death.
BAX and BAK oligomerize on the mitochondrial outer membrane, leading to membrane permeabilization and release of cytochrome c. This step is a point of no return in the intrinsic apoptotic pathway. The process is positively regulated by p53-mediated transcription and direct interactions.
Caspase Activation and Apoptosis Execution
In simple terms: A cascade of enzymes dismantles the cell.
Cytochrome c release leads to apoptosome formation and activation of caspase-9, which then activates executioner caspases-3 and -7. This results in the cleavage of cellular substrates and cell death. The entire cascade is initiated and amplified by p53 class mediators in response to DNA damage.
Modulation by HIC1 and AMH
In simple terms: Other proteins can influence how easily the cell decides to die.
HIC1 is a transcriptional repressor that can modulate p53 activity and DNA damage responses; single nucleotide polymorphisms in HIC1 may alter this function. AMH has been shown to protect ovarian cells from doxorubicin by regulating cell fate and DNA damage response, potentially by influencing the p53-apoptosis axis. These factors add layers of regulation to GO:1902167.
Key Genes Involved in GO:1902167 positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator
The following genes and proteins are key players in the positive regulation of the intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediators.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TP53 | Central mediator of DNA damage-induced apoptosis | Most frequently mutated tumor suppressor; target for cancer therapy |
| HIC1 | Transcriptional repressor modulating p53 and DNA damage response | SNPs may affect apoptosis; potential biomarker |
| AMH | Regulates cell fate and DNA damage response in ovary | Protects ovarian cells from doxorubicin; chemoprotection target |
| BAX | Pro-apoptotic effector, mitochondrial permeabilization | Key executioner of intrinsic apoptosis |
| PUMA | Pro-apoptotic BH3-only protein, p53 target | Mediates p53-dependent apoptosis |
| NOXA | Pro-apoptotic BH3-only protein, p53 target | Contributes to p53-mediated apoptosis |
| ATM | DNA damage sensor kinase, activates p53 | Upstream regulator of the pathway |
| ATR | DNA damage sensor kinase, activates p53 | Upstream regulator, especially in replication stress |
| MDM2 | Negative regulator of p53 | Controls p53 stability; target for inhibitors |
| MDM4 | Negative regulator of p53 | Modulates p53 activity |
| CDKN1A | p21, cell cycle inhibitor, p53 target | Can promote survival or apoptosis depending on context |
| GADD45A | DNA damage response, p53 target | Involved in cell cycle arrest and apoptosis |
| CASP9 | Initiator caspase in intrinsic apoptosis | Executes apoptosis after cytochrome c release |
| CASP3 | Executioner caspase | Final step of apoptosis |
| CASP7 | Executioner caspase | Final step of apoptosis |
| APAF1 | Apoptosome component | Activates caspase-9 |
| CYCS | Cytochrome c, released from mitochondria | Triggers apoptosome formation |
| BID | BH3-only protein, links extrinsic and intrinsic pathways | Amplifies apoptotic signal |
How Is positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator Regulated?
The pathway is regulated at multiple levels. p53 activity is controlled by post-translational modifications, including phosphorylation by ATM/ATR and ubiquitination by MDM2. HIC1 can repress p53 transcriptionally or modulate its activity, and genetic variations in HIC1 may alter this regulation. AMH signaling has been shown to regulate cell fate and DNA damage response in ovarian cells, potentially through modulation of p53-dependent apoptosis. Additionally, feedback loops involving MDM2 and p53 ensure that apoptosis is triggered only when damage is severe.
positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TP53 | Cancer (Li-Fraumeni syndrome, many sporadic cancers) | TP53 knockout and point-mutant cell lines, mouse models |
| HIC1 | Cancer susceptibility, DNA damage response | HIC1 knockout or SNP knock-in cells |
| AMH | Ovarian chemoprotection, DNA damage response | AMH overexpression or knockout in ovarian cell lines |
| BAX | Cancer, apoptosis resistance | BAX knockout cells |
| PUMA | Cancer, apoptosis resistance | PUMA knockout cells |
Cancer
Inactivation of p53 or its apoptotic effectors is a common event in many cancers, leading to evasion of apoptosis and tumor progression. HIC1 polymorphisms may influence cancer susceptibility by altering DNA damage-induced apoptosis. Therapeutic strategies aim to restore p53 function or directly activate the intrinsic apoptotic pathway.
Chemotherapy-Induced Ovarian Damage
Doxorubicin, a DNA-damaging agent, can cause ovarian failure. AMH has been shown to protect the ovary from doxorubicin by regulating cell fate and the response to DNA damage, possibly by modulating the p53-apoptosis axis. This highlights the pathway's role in normal tissue toxicity.
Neurodegeneration
Aberrant activation of p53-mediated apoptosis contributes to neuronal loss in neurodegenerative diseases. While direct evidence for GO:1902167 in neurodegeneration is limited, the core components are shared.
From positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does HIC1 SNP affect p53-mediated apoptosis? | HIC1 point-mutation knock-in cell lines |
| Does AMH protect ovarian cells from DNA damage? | AMH overexpression in ovarian cell lines |
| Is p53 required for DNA damage-induced apoptosis? | TP53 knockout cells |
| Can restoring p53 induce apoptosis in cancer cells? | TP53 knock-in or overexpression |
| What is the role of BAX in mitochondrial permeabilization? | BAX knockout cells |
| Does HIC1 regulate p53 transcription? | HIC1 knockout with p53 reporter |
How to Study the positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Gene essentiality for apoptosis | Identify novel regulators of p53-mediated apoptosis |
| RNA-seq | Transcriptional changes | Measure p53 target gene induction |
| Western blot | Protein cleavage and expression | Detect caspase-3, PARP cleavage |
| Flow cytometry | Apoptotic cell percentage | Quantify apoptosis after DNA damage |
| Immunoprecipitation | Protein-protein interactions | Study p53-MDM2 interaction |
| Live-cell imaging | Mitochondrial membrane potential | Monitor MOMP dynamics |
| Comet assay | DNA damage | Assess DNA damage levels |
| Reporter assays | p53 transcriptional activity | Measure p53-dependent transcription |
CRISPR-Cas9 Knockout Screens
Genome-wide CRISPR knockout screens can identify genes that positively or negatively regulate p53-mediated apoptosis after DNA damage. These screens are powerful for discovering novel regulators of GO:1902167.
RNA Sequencing (RNA-seq)
RNA-seq after DNA damage can reveal transcriptional changes in p53 target genes and apoptotic effectors, providing insights into the pathway's activation. It is useful for validating p53-dependent gene expression.
Western Blot and Immunoprecipitation
Western blotting can detect cleavage of caspases and PARP, markers of apoptosis, while immunoprecipitation can assess protein interactions such as p53-MDM2. These methods confirm pathway activation.
Flow Cytometry and Live Imaging
Flow cytometry with Annexin V/PI staining quantifies apoptosis, and live imaging of mitochondrial membrane potential (e.g., TMRE) can monitor the intrinsic pathway in real time. These techniques are essential for functional validation.
How CRISPR Can Be Used to Study GO:1902167 positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator
Knockout
CRISPR knockout of TP53, HIC1, or AMH can abolish or reduce p53-mediated apoptosis after DNA damage, helping to establish causality. Knockout models are essential for loss-of-function studies.
Point Mutation
Introducing specific point mutations, such as those found in HIC1 SNPs, can reveal their impact on DNA damage response and apoptosis. Point-mutation knock-in models mimic human genetic variations.
Knock-in
Knock-in of tagged p53 or fluorescent reporters allows real-time tracking of p53 dynamics and apoptosis activation. This approach provides spatial and temporal resolution.
Overexpression
Overexpression of AMH or pro-apoptotic genes like BAX can enhance or protect against apoptosis, depending on context. Overexpression models are useful for gain-of-function studies.
How EDITGENE Supports positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator Research
Researchers studying positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator-related genes often need to determine whether a candidate gene is causally involved in the pathway or merely correlated with its activation. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such causal studies.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator research.
Frequently Asked Questions About positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator
What is GO:1902167?
GO:1902167 is a Gene Ontology term for the biological process that positively regulates the intrinsic apoptotic signaling pathway in response to DNA damage, specifically mediated by p53 class mediators.
What genes are involved in positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator?
Key genes include TP53, HIC1, AMH, BAX, PUMA, and NOXA, among others.
How does p53 induce apoptosis after DNA damage?
p53 activates the transcription of pro-apoptotic genes such as BAX and PUMA, leading to mitochondrial outer membrane permeabilization and caspase activation.
What is the role of HIC1 in DNA damage-induced apoptosis?
HIC1 is a transcriptional repressor that can modulate p53 activity; SNPs in HIC1 may alter DNA damage responses and apoptosis.
How does AMH protect the ovary from doxorubicin?
AMH regulates cell fate and the DNA damage response, potentially by modulating p53-mediated apoptosis in ovarian cells.
What experimental models are used to study GO:1902167?
Common models include CRISPR knockout, point-mutation knock-in, and overexpression cell lines, as well as mouse models.
What diseases are associated with defects in this pathway?
Cancer is the most prominent, due to evasion of apoptosis; chemotoxicity in ovaries is also linked.
How can CRISPR screens help identify regulators of this pathway?
Genome-wide CRISPR screens can uncover genes that, when knocked out, enhance or suppress p53-mediated apoptosis after DNA damage.
What methods measure activation of the intrinsic apoptotic pathway?
Methods include flow cytometry for Annexin V, western blot for caspase cleavage, and live imaging of mitochondrial membrane potential.
Why is positive regulation of this pathway important for cancer therapy?
Restoring or enhancing this pathway can eliminate cancer cells, while protecting normal tissues from DNA damage is also critical.
Conclusion
GO:1902167 encapsulates a vital cellular defense mechanism against DNA damage, centered on p53-mediated intrinsic apoptosis. Dysregulation of this pathway contributes to cancer and chemoresistance, making it a prime target for therapeutic intervention. Continued research using advanced CRISPR models and functional genomics will unravel its complexities and translate findings into clinical benefits.
References
- 1. Annanya A et al.. 2024. Computational Analysis of Single Nucleotide Polymorphisms in Human HIC1 Gene.. Cureus 16(3):e56664 PMID: 38646326
- 2. Nguyen NMP et al.. 2024. AMH protects the ovary from doxorubicin by regulating cell fate and the response to DNA damage.. bioRxiv PMID: 38826466
