GO:1902230 negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage: Apoptosis Regulation, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902230 describes any process that stops, prevents, or reduces the intrinsic apoptotic signaling pathway triggered by DNA damage.
• This regulatory process is essential for cell survival after genotoxic stress and is often hijacked in cancer and neurodegeneration.
• Key proteins include BCL-2 family members (BCL-2, BCL-xL, MCL-1), p53, and DNA repair sensors such as ATM and HIC1.
• Dysregulation of this pathway contributes to chemoresistance, tumor progression, and neuronal loss after irradiation.
• Experimental models include CRISPR knockout, point mutation, knock-in, and overexpression cell lines to dissect gene function.
• Studying this term requires integrated approaches: transcriptomics, proteomics, and functional apoptosis assays.
Description
The Gene Ontology term GO:1902230, negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage, defines a biological process that suppresses the mitochondrial (intrinsic) apoptosis pathway activated by DNA damage. This process is critical for maintaining cell survival under genotoxic stress, but its dysregulation can lead to cancer, neurodegeneration, and resistance to therapy. Understanding how cells decide between survival and death after DNA damage is a central question in cancer biology and neurobiology. The intrinsic apoptotic pathway is governed by BCL-2 family proteins, which integrate signals from DNA damage sensors such as ATM and p53. Negative regulators of this pathway include anti-apoptotic BCL-2 proteins, IAPs, and various signaling molecules that block mitochondrial outer membrane permeabilization. This article synthesizes published findings on the mechanisms, key genes, and research methods used to study GO:1902230, providing a resource for researchers designing experiments in this field.
negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage At A Glance
| GO ID | GO:1902230 |
|---|---|
| GO term | negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage |
| Ontology | biological_process |
| Synonym | down regulation of DNA damage response, signal transduction resulting in induction of apoptosis; inhibition of intrinsic apoptotic signaling pathway in response to DNA damage; negative regulation of DNA damage response, signal transduction resulting in induction of apoptosis |
| Major function | Suppression of mitochondrial apoptosis triggered by DNA damage, promoting cell survival under genotoxic stress |
| Related pathways | p53 signaling, BCL-2 family regulation, DNA repair, cell cycle checkpoints |
| Key regulators | BCL-2, BCL-xL, MCL-1, IAPs, p53, ATM, HIC1 |
| Disease relevance | Cancer chemoresistance, neurodegeneration, radiation injury |
What Is GO:1902230?
GO:1902230 encompasses any process that stops, prevents, or reduces the frequency, rate, or extent of the intrinsic apoptotic signaling pathway in response to DNA damage. In other words, it is the set of cellular mechanisms that protect cells from undergoing mitochondrial apoptosis after their DNA is damaged. This includes upregulation of anti-apoptotic proteins, inhibition of pro-apoptotic factors, and modulation of DNA damage signaling to favor survival.
Why Is negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage Important in Cell Biology?
GO:1902230 is important because it determines cell fate after DNA damage, influencing cancer development, treatment response, and neuronal survival. Many tumors overexpress anti-apoptotic proteins to evade apoptosis, making this process a target for therapeutic intervention. Conversely, excessive negative regulation can contribute to neurodegeneration by allowing damaged neurons to survive with genomic instability. Understanding this term helps researchers identify molecular switches that can be manipulated to enhance cancer therapy or protect normal tissues.
• Determines whether a cell survives or dies after DNA damage, impacting cancer and aging.
• Overexpression of anti-apoptotic BCL-2 proteins is a common mechanism of chemoresistance.
• p53 mutations can disrupt negative regulation, leading to uncontrolled apoptosis or survival.
• Modulation of this pathway can protect neurons from irradiation-induced apoptosis.
• Environmental toxins such as arsenic and chromium can alter intrinsic apoptosis regulation.
• Targeting negative regulators (e.g., BCL-2 inhibitors) is a major therapeutic strategy.
• CRISPR screens can identify novel genes that negatively regulate DNA damage-induced apoptosis.
• This process is conserved across species, from zebrafish to humans.
• Dysregulation is linked to senescence-like cell cycle arrest in cancer.
• Understanding it aids in designing radiation countermeasures and chemoprotectants.
What Happens During negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage?
DNA Damage Sensing and Signal Initiation
In simple terms: When DNA is damaged, sensor proteins detect the damage and start a signaling cascade.
DNA damage is detected by sensor kinases such as ATM and ATR, which activate downstream effectors including p53. This initiates a signaling cascade that can lead to either cell cycle arrest, DNA repair, or apoptosis. Negative regulation of the intrinsic apoptotic pathway begins with the activation of survival signals that counteract these pro-apoptotic cues.
Mitochondrial Outer Membrane Permeabilization (MOMP) Control
In simple terms: The mitochondria decide whether to release death signals; negative regulators keep them sealed.
MOMP is the point of no return for intrinsic apoptosis, controlled by BCL-2 family proteins. Anti-apoptotic proteins such as BCL-2, BCL-xL, and MCL-1 bind and inhibit pro-apoptotic effectors BAX and BAK, preventing MOMP. Negative regulation of DNA damage-induced apoptosis often involves upregulation or stabilization of these anti-apoptotic proteins.
Inhibition of Caspase Activation
In simple terms: Even if mitochondria leak, negative regulators can block the executioner caspases.
Following MOMP, cytochrome c release activates caspase-9 and downstream caspase-3/7. Inhibitor of apoptosis proteins (IAPs) can directly bind and inhibit caspases, providing a second layer of negative regulation. This mechanism is often exploited by cancer cells to resist apoptosis.
Modulation of p53 Activity
In simple terms: p53 is a key decision-maker; negative regulators can reduce its pro-apoptotic power.
p53 induces pro-apoptotic genes like PUMA and NOXA after DNA damage. Negative regulation can occur through MDM2-mediated degradation of p53 or through inhibition of p53 transcriptional activity. HIC1 is a transcriptional repressor that can modulate p53-dependent apoptosis.
Cross-talk with DNA Repair and Autophagy
In simple terms: Survival signals also boost DNA repair and recycling to avoid death.
Negative regulation of apoptosis is often coupled with enhanced DNA repair and autophagy. For example, cGAS-STING signaling can induce apoptosis that negatively regulates IFN response, but also intersects with autophagy. In zebrafish, Nrf2-Keap1-ARE pathway activation protects against arsenic-induced apoptosis by upregulating antioxidant and repair genes.
Key Genes Involved in GO:1902230 negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage
The following genes and proteins are central to the negative regulation of the intrinsic apoptotic signaling pathway in response to DNA damage, based on published literature [1-8].
| Gene | Major Role | Research Relevance |
|---|---|---|
| BCL2 | Anti-apoptotic, inhibits MOMP | Overexpressed in lymphomas and chemoresistant tumors |
| BCL2L1 (BCL-xL) | Anti-apoptotic, binds BAX/BAK | Target for cancer therapy; regulates neuronal survival |
| MCL1 | Anti-apoptotic, inhibits MOMP | Frequently amplified in cancers; resistance to BCL-2 inhibitors |
| BAX | Pro-apoptotic effector | Counteracted by BCL-2 proteins; mutated in cancers |
| BAK | Pro-apoptotic effector | Essential for MOMP; regulated by anti-apoptotic proteins |
| TP53 | Tumor suppressor, induces apoptosis | Mutated in >50% cancers; regulates DNA damage response |
| MDM2 | Negative regulator of p53 | Amplified in sarcomas; target for drug design |
| HIC1 | Transcriptional repressor | SNPs linked to cancer susceptibility; modulates p53 |
| ATM | DNA damage sensor kinase | Mutations cause ataxia-telangiectasia; activates p53 |
| CHEK2 | Cell cycle checkpoint kinase | Variant increases cancer risk; interacts with p53 |
| XIAP | Inhibitor of apoptosis | Blocks caspase-3/7; overexpressed in cancers |
| BIRC5 (Survivin) | Inhibitor of apoptosis | Promotes cell survival; target for therapy |
| CASP3 | Executioner caspase | Final step of apoptosis; inhibited by IAPs |
| CASP9 | Initiator caspase | Activated by cytochrome c; regulated by IAPs |
| CYCS | Cytochrome c | Released from mitochondria; triggers apoptosome |
| Nrf2 (NFE2L2) | Antioxidant response | Protects against arsenic-induced apoptosis in zebrafish |
| cGAS (MB21D1) | DNA sensor | Induces apoptosis that negatively regulates IFN response |
How Is negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage Regulated?
The negative regulation of intrinsic apoptosis in response to DNA damage is tightly controlled by multiple signaling pathways. The PI3K/AKT pathway promotes survival by phosphorylating and inhibiting pro-apoptotic proteins such as BAD and caspase-9. NF-κB signaling induces anti-apoptotic genes including BCL-2, BCL-xL, and XIAP. The p53 pathway is central, with MDM2 providing negative feedback. Additionally, microRNAs such as miR-23a-3p can modulate apoptosis; down-regulation of miR-23a-3p mediates irradiation-induced neuronal apoptosis, suggesting its role in negative regulation. In zebrafish, the Nrf2-Keap1-ARE pathway upregulates antioxidant genes to counteract arsenic-induced intrinsic apoptosis. These regulatory layers ensure that cell fate decisions are context-dependent.
negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BCL2 | Lymphoma, chemoresistance | BCL2 overexpression in cancer cell lines; KO in mice |
| TP53 | Li-Fraumeni syndrome, multiple cancers | TP53 knockout or point mutant (R175H) cell lines |
| HIC1 | Cancer susceptibility | HIC1 SNP knock-in models; transcriptional reporter assays |
| Nrf2 (NFE2L2) | Arsenic toxicity, oxidative stress | Zebrafish nrf2a knockout; ARE-luciferase assays |
| cGAS (MB21D1) | Innate immunity, apoptosis regulation | cGAS knockout porcine cells; STING pathway analysis |
Cancer Chemoresistance and Tumor Progression
Overexpression of anti-apoptotic proteins such as BCL-2, BCL-xL, and MCL-1 is a common mechanism by which cancer cells evade DNA damage-induced apoptosis, leading to chemoresistance and tumor progression. Small molecule inhibitors targeting these proteins (e.g., venetoclax) have shown clinical efficacy, highlighting the importance of this pathway. Mutations in TP53 or MDM2 can also disrupt negative regulation, contributing to genomic instability.
Neurodegeneration and Radiation Injury
In neurons, excessive negative regulation of apoptosis can allow damaged cells to survive with DNA damage, potentially leading to neurodegeneration. Conversely, irradiation-induced neuronal apoptosis is mediated by down-regulation of miR-23a-3p, indicating that microRNAs can tip the balance toward death. Understanding these mechanisms may lead to neuroprotective strategies.
Environmental Toxicity and Oxidative Stress
Exposure to arsenic and chromium induces oxidative stress and DNA damage, activating intrinsic apoptosis in zebrafish kidney. The Nrf2-Keap1-ARE pathway provides negative regulation by upregulating antioxidant and DNA repair genes, protecting against toxicity. This highlights the role of environmental factors in modulating GO:1902230.
Senescence and Aging
Senescence-like cell cycle arrest in cancer cells is often accompanied by resistance to apoptosis. Negative regulation of intrinsic apoptosis can promote senescence as a tumor-suppressive mechanism, but also contributes to aging phenotypes. Targeting this pathway may have dual effects in cancer and aging.
From negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate DNA damage-induced apoptosis? | CRISPR knockout of gene X in HeLa or U2OS cells, followed by etoposide treatment and caspase-3 activity assay |
| Does a specific point mutation in TP53 affect its pro-apoptotic function? | CRISPR knock-in of mutant TP53 (e.g., R175H) in isogenic cell lines |
| Can overexpression of BCL-2 protect neurons from irradiation? | Lentiviral overexpression of BCL2 in primary neurons or SH-SY5Y cells |
| What is the role of HIC1 in p53-mediated apoptosis? | HIC1 knockout and rescue with wild-type or SNP variants |
| How does Nrf2 activation affect arsenic-induced apoptosis? | Zebrafish nrf2a knockout and Nrf2 activator treatment |
| Does cGAS-STING signaling modulate apoptosis and IFN response? | cGAS knockout porcine cells and STING agonist treatment |
How to Study the negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify survival genes after DNA damage |
| Proteomics | Protein abundance and interactions | Map BCL-2 family complexes |
| Caspase-3/7 activity assay | Apoptosis execution | Screen for negative regulators |
| Annexin V flow cytometry | Phosphatidylserine exposure | Quantify apoptosis in KO cells |
| Mitochondrial membrane potential (JC-1) | MOMP | Assess BCL-2 function |
| CRISPR knockout screen | Gene function loss | Identify novel negative regulators |
| SNP functional analysis | Genetic variant impact | Study HIC1 SNPs in cancer |
| Zebrafish toxicity assay | In vivo apoptosis and oxidative stress | Environmental toxin studies |
Transcriptomic and Proteomic Profiling
RNA-seq and proteomics can identify global changes in gene expression after DNA damage, revealing negative regulators of apoptosis. For example, irradiation-induced changes in microRNAs like miR-23a-3p were identified by transcriptomics. Proteomic analysis of BCL-2 family interactions can uncover survival complexes.
Functional Apoptosis Assays
Apoptosis is measured by caspase-3/7 activity, Annexin V staining, TUNEL, and mitochondrial membrane potential assays. These assays are used to test whether a gene knockout or overexpression alters DNA damage-induced apoptosis. High-content imaging can quantify apoptosis in a 96-well format.
CRISPR Screens and Bioinformatics
Genome-wide CRISPR knockout or activation screens can identify genes that negatively regulate apoptosis after DNA damage. Bioinformatics tools analyze SNP effects, as demonstrated for HIC1. Pathway enrichment and network analysis help place hits in the context of GO:1902230.
In Vivo Models
Zebrafish and mouse models allow study of apoptosis regulation in a whole organism. For example, arsenic-induced kidney toxicity in zebrafish involves intrinsic apoptosis and Nrf2-mediated protection. Mouse models of neurodegeneration can test neuroprotective strategies.
How CRISPR Can Be Used to Study GO:1902230 negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage
Knockout
CRISPR knockout of candidate genes is used to test whether they are required for negative regulation of DNA damage-induced apoptosis. For example, knocking out BCL2 or MCL1 sensitizes cells to apoptosis. Genome-wide knockout screens have identified novel regulators.
Point Mutation
Point mutations can mimic cancer-associated variants, such as TP53 R175H, to study their impact on apoptosis regulation. CRISPR prime editing or HDR can introduce specific SNPs in HIC1 to assess functional consequences.
Knock-in
Knock-in of tagged proteins (e.g., GFP-BCL2) allows live-cell imaging of protein localization and dynamics during apoptosis. Knock-in of reporter genes under apoptotic promoters can monitor pathway activity.
Overexpression
Overexpression of anti-apoptotic genes such as BCL2 or BCL-xL protects cells from DNA damage-induced apoptosis, confirming their negative regulatory role. Inducible overexpression systems allow temporal control.
How EDITGENE Supports negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage Research
Researchers studying negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage-related genes often need to determine whether a candidate gene is causally involved in cell survival or death decisions. EDITGENE provides comprehensive CRISPR services to create precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage research.
Frequently Asked Questions About negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage
What is GO:1902230?
GO:1902230 is a Gene Ontology term for any process that stops, prevents, or reduces the intrinsic apoptotic signaling pathway in response to DNA damage.
What genes are involved in negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage?
Key genes include BCL2, BCL2L1, MCL1, TP53, MDM2, HIC1, and XIAP, among others.
How does BCL-2 inhibit DNA damage-induced apoptosis?
BCL-2 binds and inhibits pro-apoptotic BAX and BAK, preventing mitochondrial outer membrane permeabilization and caspase activation.
What is the role of p53 in this pathway?
p53 induces pro-apoptotic genes after DNA damage, but its activity can be negatively regulated by MDM2 and other factors.
Can CRISPR be used to study this pathway?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function in this pathway.
What diseases are associated with dysregulation of this pathway?
Cancer chemoresistance, neurodegeneration, and environmental toxicity are linked to altered regulation of DNA damage-induced apoptosis.
How is this pathway measured experimentally?
Common methods include caspase-3/7 activity assays, Annexin V staining, mitochondrial membrane potential assays, and transcriptomics.
What is the difference between intrinsic and extrinsic apoptosis?
Intrinsic apoptosis is mitochondria-mediated and triggered by internal stress like DNA damage, while extrinsic apoptosis is initiated by death receptors.
Are there microRNAs that regulate this pathway?
Yes, miR-23a-3p down-regulation mediates irradiation-induced neuronal apoptosis, indicating its role in negative regulation.
What model organisms are used to study this pathway?
Zebrafish, mice, and cell lines (e.g., HeLa, U2OS, SH-SY5Y) are commonly used.
Conclusion
GO:1902230 represents a critical cellular decision point that determines survival or death after DNA damage. Its dysregulation is implicated in cancer, neurodegeneration, and environmental toxicity, making it a prime target for therapeutic intervention. Advances in CRISPR genome editing and functional genomics now allow precise dissection of the genes and mechanisms that negatively regulate intrinsic apoptosis. EDITGENE's suite of CRISPR services empowers researchers to create tailored cell models and accelerate discoveries in this important field.
References
- 1. Xia N et al.. 2025. Porcine cGAS-STING signalling induced apoptosis negatively regulates STING downstream IFN response and autophagy via different mechanisms.. Virulence 16(1):2496436 PMID: 40310883
- 2. Annanya A et al.. 2024. Computational Analysis of Single Nucleotide Polymorphisms in Human HIC1 Gene.. Cureus 16(3):e56664 PMID: 38646326
- 3. Sabirzhanov B et al.. 2020. Down-Regulation of miR-23a-3p Mediates Irradiation-Induced Neuronal Apoptosis.. Int J Mol Sci 21(10) PMID: 32456284
- 4. Zarneshan SN et al.. 2023. Exploiting pivotal mechanisms behind the senescence-like cell cycle arrest in cancer.. Adv Protein Chem Struct Biol 135:1-19 PMID: 37061329
- 5. Danial NN et al.. 2010. Homeostatic functions of BCL-2 proteins beyond apoptosis.. Adv Exp Med Biol 687:1-32 PMID: 20919635
- 6. Silva Dos Santos M et al.. 2021. A novel 1-((3-(2-toluyl)-4,5-dihydroisoxazol-5-yl)methyl)-4-(trifluoromethyl)pyrimidin-2(1H)-one activates intrinsic mitochondria-dependent pathway and decreases angiogenesis in PC-3 cells.. Eur J Pharmacol 899:174028 PMID: 33727055
- 7. Cao C et al.. 2020. Dexmedetomidine alleviates postoperative cognitive dysfunction through circular RNA in aged rats.. 3 Biotech 10(4):176 PMID: 32226705
- 8. Kamila S et al.. 2025. Arsenic and Chromium Induced Toxicity on Zebrafish Kidney: Mixture Effects on Oxidative Stress and Involvement of Nrf2-Keap1-ARE, DNA Repair, and Intrinsic Apoptotic Pathways.. J Appl Toxicol 45(3):387-399 PMID: 39402722
