GO:2000781 positive regulation of double-strand break repair: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:2000781 describes any process that activates or increases the frequency, rate or extent of double-strand break repair, a critical biological_process for genome stability.
• Double-strand break repair pathway choice is regulated by RNA and RNA-related proteins, which can promote either homologous recombination or non-homologous end joining.
• Key positive regulators include SRSF4, which accelerates double-strand break repair and confers temozolomide resistance in glioma, and the FIGNL1-FIRRM complex, which modulates RAD51 and DMC1 loading during meiotic recombination.
• In plants, the COP1-ADA2b module mediates light regulation of double-strand break repair, linking environmental cues to genome maintenance.
• Deficient regulation of double-strand break repair is observed in Fanconi anemia fibroblasts, highlighting the clinical relevance of this process.
• Crosstalk between DNA damage and the cGAS-STING immune pathway drives neuroinflammation and dopaminergic neurodegeneration in Parkinson's disease, underscoring the impact of repair regulation on neurodegeneration.
Description
Double-strand breaks (DSBs) are among the most cytotoxic DNA lesions, and their repair is essential for maintaining genomic integrity. The Gene Ontology term GO:2000781, positive regulation of double-strand break repair, encompasses any process that activates or increases the frequency, rate or extent of DSB repair. This regulation is critical because insufficient or misregulated repair can lead to mutations, chromosomal rearrangements, and cell death, contributing to cancer, neurodegeneration, and developmental disorders [1, 7]. Researchers study this term to understand how cells orchestrate repair pathway choice, how RNA and RNA-binding proteins influence repair efficiency, and how defects in these regulatory mechanisms drive disease [1, 3, 8]. The importance of positive regulation is evident in contexts such as cancer therapy resistance, where upregulation of repair factors like SRSF4 promotes survival, and in meiosis, where precise modulation of recombinases ensures faithful chromosome segregation [4, 5]. Understanding the molecular players and regulatory networks that positively regulate DSB repair is therefore central to both basic biology and translational medicine.
positive regulation of double-strand break repair At A Glance
| GO ID | GO:2000781 |
|---|---|
| GO term | positive regulation of double-strand break repair |
| Ontology | biological_process |
| Synonym | none |
| Major function | Activates or increases the frequency, rate or extent of double-strand break repair |
| Related processes | DNA repair, homologous recombination, non-homologous end joining, meiosis |
| Key regulators | RNA-related proteins, SRSF4, FIGNL1-FIRRM, COP1-ADA2b |
| Disease relevance | Cancer, Fanconi anemia, Parkinson's disease, glioma resistance |
What Is GO:2000781?
GO:2000781 is defined as any process that activates or increases the frequency, rate or extent of double-strand break repair. In other words, it includes molecular events, signaling pathways, and cellular responses that enhance the cell's ability to repair DSBs, whether by homologous recombination, non-homologous end joining, or other mechanisms.
Why Is positive regulation of double-strand break repair Important in Cell Biology?
Positive regulation of double-strand break repair is vital for genome stability and cell survival. Dysregulation of this process can lead to accumulation of DNA damage, driving oncogenesis, neurodegeneration, and premature aging [1, 7]. Moreover, many cancer therapies rely on inducing DSBs; thus, understanding how cells upregulate repair can reveal mechanisms of resistance and suggest targets for sensitization. In meiosis, proper positive regulation ensures genetic diversity and faithful chromosome segregation [4, 5]. Consequently, this GO term is a focal point for research in DNA repair, cancer biology, neurobiology, and reproductive genetics.
• Maintains genomic integrity by ensuring efficient repair of cytotoxic double-strand breaks.
• Influences cancer therapy outcomes, as upregulation of repair factors like SRSF4 confers temozolomide resistance in glioma.
• Plays a role in Fanconi anemia, where deficient regulation of DSB repair contributes to disease pathology.
• Modulates neuroinflammation and neurodegeneration through cGAS-STING crosstalk in Parkinson's disease.
• Essential for meiotic recombination, as shown by the FIGNL1-FIRRM complex preventing inappropriate RAD51/DMC1 loading.
• Regulated by environmental cues in plants via the COP1-ADA2b module, linking light signaling to genome maintenance.
• Involves RNA and RNA-related proteins that influence repair pathway choice.
• Provides potential therapeutic targets for sensitizing cancer cells to DNA-damaging agents.
• Contributes to understanding of evolutionary conserved mechanisms across eukaryotes.
• Offers insights into male and female infertility related to meiotic defects.
What Happens During positive regulation of double-strand break repair?
Sensing and signaling of double-strand breaks
In simple terms: When DNA breaks, cells quickly detect the damage and send signals to start repair.
The initial step in positive regulation involves recognition of DSBs by sensor proteins that activate signaling cascades. RNA and RNA-related proteins have been implicated in regulating repair pathway choice, potentially influencing the recruitment of downstream effectors. This sensing phase is critical for determining whether repair proceeds via homologous recombination or non-homologous end joining, and positive regulators can bias this choice to enhance overall repair efficiency.
Enhancement of homologous recombination
In simple terms: One major repair pathway uses a template to accurately fix breaks, and positive regulators boost this process.
Homologous recombination (HR) is a high-fidelity repair pathway that requires resection of DNA ends and loading of recombinases like RAD51. Positive regulation can increase HR frequency by promoting the activity of recombinases and their modulators. For example, the FIGNL1-FIRRM complex is essential for meiotic recombination and prevents DNA damage-independent RAD51 and DMC1 loading, thereby ensuring proper regulation of recombinase activity. In plants, eukaryotic RecA recombinases and their modulators play key roles in DSB repair during meiosis.
Regulation of non-homologous end joining
In simple terms: Another repair pathway directly joins broken ends, and positive regulators can enhance its efficiency.
Non-homologous end joining (NHEJ) is a faster but error-prone repair mechanism. Positive regulation of DSB repair can also involve upregulation of NHEJ components. RNA-related proteins may influence NHEJ efficiency, as suggested by their role in repair pathway choice. However, specific positive regulators of NHEJ are less well-characterized compared to HR, and further research is needed to identify the full complement of factors.
Role of RNA and RNA-binding proteins
In simple terms: RNA molecules and proteins that bind RNA can help or direct the repair process.
Emerging evidence indicates that RNA and RNA-related proteins are integral to the regulation of DSB repair. They can influence repair pathway choice by modulating the recruitment of repair factors or by participating in DNA damage response signaling. For instance, SRSF4, an RNA-binding protein, accelerates DSB repair and confers temozolomide resistance in glioma, demonstrating a direct positive regulatory role.
Environmental and developmental regulation
In simple terms: External signals like light can affect how cells repair DNA breaks.
In plants, the COP1-ADA2b module mediates light regulation of DSB repair, linking environmental cues to genome maintenance. This highlights that positive regulation can be subject to developmental and environmental control, ensuring repair capacity is tuned to the organism's context.
Key Genes Involved in GO:2000781 positive regulation of double-strand break repair
The following genes and proteins are key players in the positive regulation of double-strand break repair, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SRSF4 | RNA-binding protein that accelerates DSB repair | Confers temozolomide resistance in glioma; potential therapeutic target |
| FIGNL1 | Recombinase modulator; prevents inappropriate RAD51/DMC1 loading | Essential for meiotic recombination; studied in mouse models |
| FIRRM | Part of FIGNL1-FIRRM complex; regulates recombinase loading | Required for meiosis and genome stability |
| RAD51 | Central recombinase in homologous recombination | Key effector of DSB repair; target of positive regulation |
| DMC1 | Meiosis-specific recombinase | Regulated by FIGNL1-FIRRM to ensure proper recombination |
| COP1 | E3 ubiquitin ligase involved in light signaling | Mediates light regulation of DSB repair in Arabidopsis |
| ADA2b | Transcriptional coactivator | Part of COP1-ADA2b module regulating DSB repair |
| cGAS | DNA sensor that activates STING pathway | Links DNA damage to neuroinflammation in Parkinson's disease |
| STING | Adaptor protein in innate immune signaling | Mediates cGAS-STING crosstalk with DSB repair |
| FANCD2 | Fanconi anemia protein involved in DNA repair | Deficient regulation of DSB repair in Fanconi anemia |
| FANCA | Fanconi anemia complementation group A protein | Mutations cause Fanconi anemia with DSB repair defects |
| BRCA1 | Tumor suppressor involved in HR | Positive regulator of DSB repair; frequently mutated in cancer |
| BRCA2 | Tumor suppressor that facilitates RAD51 loading | Key HR factor; mutations lead to cancer predisposition |
| ATM | Kinase that orchestrates DNA damage response | Central positive regulator of DSB repair signaling |
| ATR | Kinase responding to replication stress | Contributes to DSB repair regulation |
| 53BP1 | Chromatin reader that promotes NHEJ | Influences repair pathway choice |
| MDC1 | Mediator of DNA damage checkpoint | Enhances DSB signaling and repair |
How Is positive regulation of double-strand break repair Regulated?
Positive regulation of double-strand break repair is itself tightly regulated at multiple levels. Post-translational modifications, such as phosphorylation by ATM and ATR, control the recruitment and activity of repair factors. RNA-binding proteins like SRSF4 can modulate repair efficiency, as shown in glioma cells where SRSF4 accelerates DSB repair. In plants, the COP1-ADA2b module mediates light-dependent regulation of DSB repair, illustrating environmental control. Additionally, the cGAS-STING pathway can be activated by DNA damage, leading to inflammatory responses that may feedback on repair processes. These regulatory layers ensure that repair is activated appropriately and terminated once damage is resolved.
positive regulation of double-strand break repair and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SRSF4 | Glioma resistance to temozolomide | Knockout or overexpression in glioma cell lines |
| FIGNL1 | Meiotic recombination defects | Knockout mouse models |
| FANCD2 | Fanconi anemia | Patient-derived fibroblasts or CRISPR knockout cells |
| cGAS | Parkinson's disease neuroinflammation | Knockout mice or neuronal cell lines |
| COP1 | Light-regulated DSB repair in plants | Arabidopsis mutants |
Cancer and therapy resistance
Upregulation of DSB repair is a common mechanism of resistance to DNA-damaging therapies. In glioma, SRSF4 promotes DSB repair and confers resistance to temozolomide, suggesting that targeting SRSF4 or its downstream effectors could sensitize tumors. Similarly, defects in Fanconi anemia proteins lead to impaired regulation of DSB repair, contributing to cancer predisposition and bone marrow failure.
Neurodegeneration
Crosstalk between DNA damage and the cGAS-STING immune pathway drives neuroinflammation and dopaminergic neurodegeneration in Parkinson's disease. This highlights how dysregulated DSB repair can trigger innate immune responses that damage neurons, offering potential targets for neuroprotective therapies.
Fanconi anemia
Fanconi anemia is a genetic disorder characterized by deficient regulation of DSB repair. Fibroblasts from Fanconi anemia patients show abnormal repair responses, underscoring the importance of positive regulation for genome stability.
Meiotic defects and infertility
Proper regulation of DSB repair is essential for meiosis. Disruption of the FIGNL1-FIRRM complex leads to inappropriate RAD51 and DMC1 loading, impairing meiotic recombination and potentially causing infertility. Understanding these mechanisms can inform reproductive medicine.
From positive regulation of double-strand break repair-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SRSF4 promote DSB repair and therapy resistance? | SRSF4 knockout or overexpression in glioma cells |
| How does FIGNL1-FIRRM regulate recombinase loading? | FIGNL1 or FIRRM knockout mouse models |
| What is the role of COP1-ADA2b in light-dependent DSB repair? | Arabidopsis cop1 or ada2b mutants |
| Does cGAS-STING crosstalk contribute to neurodegeneration? | cGAS or STING knockout mice |
| Are Fanconi anemia proteins required for positive regulation of DSB repair? | FANCD2 or FANCA knockout cell lines |
| What RNA-related proteins influence repair pathway choice? | CRISPR knockout screens targeting RNA-binding proteins |
How to Study the positive regulation of double-strand break repair Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Loss-of-function effects on DSB repair | Identify positive regulators |
| HR/NHEJ reporter assay | Repair pathway efficiency | Validate candidate regulators |
| Proteomics | Protein interactions and modifications | Characterize repair complexes |
| Immunofluorescence | Repair foci formation | Assess recruitment of repair factors |
| RNA-seq | Transcriptional changes after DNA damage | Identify upregulated repair genes |
| Mass spectrometry | Protein abundance and modifications | Compare HPV-positive vs negative cancers |
| Comet assay | DNA break levels | Measure repair capacity |
| Flow cytometry | Cell cycle and apoptosis | Evaluate survival after damage |
CRISPR knockout screens
Genome-wide CRISPR knockout screens can identify positive regulators of DSB repair by selecting for cells that survive DNA-damaging agents. This approach has been used to uncover RNA-related proteins involved in repair pathway choice.
Reporter-based DSB repair assays
Fluorescent or luminescent reporters that measure homologous recombination or non-homologous end joining efficiency can quantify positive regulation. These assays are useful for validating candidate regulators identified in screens.
Proteomics and interactomics
Mass spectrometry-based proteomics can reveal protein complexes and post-translational modifications that regulate DSB repair. For example, the FIGNL1-FIRRM complex was characterized using such methods.
Imaging of repair foci
Immunofluorescence or live-cell imaging of repair foci (e.g., RAD51, 53BP1) allows spatial and temporal assessment of positive regulation. This method is widely used to study recruitment kinetics.
How CRISPR Can Be Used to Study GO:2000781 positive regulation of double-strand break repair
Knockout
CRISPR knockout of candidate positive regulators (e.g., SRSF4, FIGNL1) can determine their necessity for efficient DSB repair. For instance, knocking out SRSF4 in glioma cells may reverse temozolomide resistance.
Point Mutation
Introducing point mutations in catalytic or regulatory domains of repair proteins (e.g., ATM kinase) can dissect their specific roles in positive regulation without completely abolishing protein expression.
Knock-in
Knock-in of tagged versions of repair proteins (e.g., GFP-RAD51) allows real-time imaging of their recruitment to DSB sites, providing insights into positive regulation dynamics.
Overexpression
Overexpression of positive regulators like SRSF4 can enhance DSB repair and confer resistance to DNA-damaging agents, serving as a model for therapy resistance.
How EDITGENE Supports positive regulation of double-strand break repair Research
Researchers studying positive regulation of double-strand break repair-related genes often need to determine whether a candidate gene is causally involved in enhancing repair efficiency, and to dissect its mechanism of action. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of double-strand break repair research.
Frequently Asked Questions About positive regulation of double-strand break repair
What is GO:2000781?
GO:2000781 is a Gene Ontology term for any process that activates or increases the frequency, rate or extent of double-strand break repair.
What genes are involved in positive regulation of double-strand break repair?
Key genes include SRSF4, FIGNL1, FIRRM, RAD51, DMC1, COP1, ADA2b, cGAS, STING, FANCD2, and FANCA, among others [1, 2, 3, 4, 7, 8].
How does SRSF4 regulate double-strand break repair?
SRSF4 accelerates DSB repair and confers temozolomide resistance in glioma, acting as a positive regulator.
What is the role of FIGNL1-FIRRM in DSB repair?
The FIGNL1-FIRRM complex is essential for meiotic recombination and prevents DNA damage-independent RAD51 and DMC1 loading, thus regulating recombinase activity.
How is double-strand break repair regulated by light in plants?
The COP1-ADA2b module mediates light regulation of DSB repair in Arabidopsis, linking environmental cues to genome maintenance.
What diseases are associated with defective regulation of DSB repair?
Cancer, Fanconi anemia, Parkinson's disease, and meiotic defects leading to infertility are associated with dysregulated DSB repair [3, 4, 7, 8].
How can CRISPR be used to study positive regulation of DSB repair?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of candidate regulators in cell lines and animal models [1, 3, 4].
What methods are used to measure positive regulation of DSB repair?
Methods include CRISPR screens, HR/NHEJ reporter assays, proteomics, immunofluorescence, RNA-seq, and comet assays [1, 3, 4, 8].
What is the connection between DNA damage and neuroinflammation?
Crosstalk between DNA damage and the cGAS-STING immune pathway drives neuroinflammation and dopaminergic neurodegeneration in Parkinson's disease.
Why is positive regulation of DSB repair important for cancer therapy?
Upregulation of DSB repair can cause resistance to DNA-damaging therapies like temozolomide, making it a target for sensitization strategies.
Conclusion
GO:2000781, positive regulation of double-strand break repair, is a fundamental biological process that ensures genome stability and influences disease outcomes. Key regulators such as SRSF4, FIGNL1-FIRRM, and the COP1-ADA2b module have been identified, and their roles in cancer, neurodegeneration, and meiosis are increasingly appreciated [1, 2, 3, 4, 7, 8]. Continued research using CRISPR-based models and advanced screening methods will further elucidate the mechanisms and therapeutic potential of targeting this process.
References
- 1. Jimeno S et al.. 2019. The role of RNA and RNA-related proteins in the regulation of DNA double strand break repair pathway choice.. DNA Repair (Amst) 81:102662 PMID: 31303544
- 2. Chen L et al.. 2026. The COP1-ADA2b module mediates light regulation of DNA double-strand break repair in Arabidopsis.. Nat Commun 17(1) PMID: 41820379
- 3. Sun Y et al.. 2023. SRSF4 Confers Temozolomide Resistance of Glioma via Accelerating Double Strand Break Repair.. J Mol Neurosci 73(4-5):259-268 PMID: 37014544
- 4. Zainu A et al.. 2024. FIGNL1-FIRRM is essential for meiotic recombination and prevents DNA damage-independent RAD51 and DMC1 loading.. Nat Commun 15(1):7015 PMID: 39147779
- 5. Emmenecker C et al.. 2023. Repair of DNA double-strand breaks in plant meiosis: role of eukaryotic RecA recombinases and their modulators.. Plant Reprod 36(1):17-41 PMID: 35641832
- 6. Wurlitzer M et al.. 2020. Mass Spectrometric Comparison of HPV-Positive and HPV-Negative Oropharyngeal Cancer.. Cancers (Basel) 12(6) PMID: 32545200
- 7. Khan S et al.. 2025. Crosstalk between DNA damage and cGAS-STING immune pathway drives neuroinflammation and dopaminergic neurodegeneration in Parkinson's disease.. Brain Behav Immun 130:106065 PMID: 40752659
- 8. Donahue SL et al.. 2003. Deficient regulation of DNA double-strand break repair in Fanconi anemia fibroblasts.. J Biol Chem 278(32):29487-95 PMID: 12748186
