GO:0010971 positive regulation of G2/M transition of mitotic cell cycle: Signaling Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0010971 describes any signaling pathway that activates or increases the activity of a cyclin-dependent protein kinase to promote entry from G2 phase into mitosis.
• The defining molecular event is activation of the Cdk1-cyclin B complex, often through activating phosphorylation of Cdc25 phosphatases and removal of inhibitory Wee1-mediated phosphorylation.
• Key positive regulators include RSK, Cdc25A, Cdc25B, Aurora kinase A, protein kinase D2, p115, and GATA1/TAL1-dependent transcriptional programs.
• Dysregulated G2/M transition is linked to cancer, including epithelial ovarian cancer and leukemia, making this process a therapeutic target.
• The target of rapamycin (TOR) signaling pathway controls cell cycle progression, including G2/M, in plants and other eukaryotes.
• Network-level analysis of cell cycle regulators can predict functional modules controlling G2/M progression.
Description
The G2/M transition is the decisive checkpoint that commits a cell to mitosis. GO:0010971, positive regulation of G2/M transition of mitotic cell cycle, captures the signaling events that activate cyclin-dependent protein kinases to drive this switch. This term is essential for understanding how cells integrate growth, stress, and developmental signals to time mitotic entry. Disruption of these pathways contributes to uncontrolled proliferation in cancer and to developmental defects. Researchers study GO:0010971 to identify therapeutic targets, to model cell cycle control in diverse organisms, and to build predictive networks of cell cycle regulators.
positive regulation of G2/M transition of mitotic cell cycle At A Glance
| GO ID | GO:0010971 |
|---|---|
| GO term | positive regulation of G2/M transition of mitotic cell cycle |
| Ontology | biological_process |
| Synonym | positive regulation of cyclin-dependent protein serine/threonine kinase activity involved in G2/M transition of mitotic cell cycle; positive regulation of mitotic entry |
| Major function | Activation of cyclin-dependent protein kinases to promote entry into mitosis |
| Key molecular event | Activating phosphorylation of Cdc25A/Cdc25B and Cdk1 activation |
| Representative regulators | RSK, Cdc25A, Cdc25B, Aurora kinase A, protein kinase D2, p115, GATA1/TAL1 axis |
| Disease relevance | Cancer, including ovarian cancer and leukemia |
| Model organisms | Human cells, Drosophila, plants |
What Is GO:0010971?
GO:0010971 is a biological process term defined as any signaling pathway that activates or increases the activity of a cell cycle cyclin-dependent protein kinase to modulate the switch from G2 phase to M phase of the mitotic cell cycle. In practice, this includes phosphorylation events that activate Cdk1-cyclin B, such as activating phosphorylation of Cdc25A and Cdc25B by RSK, and the removal of inhibitory phosphorylation by Wee1. The term also encompasses upstream regulators such as Aurora kinase A, protein kinase D2, and p115 that promote Cdk1 activation.
Why Is positive regulation of G2/M transition of mitotic cell cycle Important in Cell Biology?
GO:0010971 is important because the G2/M transition is a point of no return in the cell cycle. Positive regulation ensures that mitosis begins only when chromosomes are replicated and damage is repaired. When these pathways are hyperactivated, cells can bypass checkpoints and proliferate abnormally, as seen in epithelial ovarian cancer and leukemia. Conversely, understanding these mechanisms provides opportunities for targeted therapies that selectively block mitotic entry in cancer cells.
• Controls the commitment step for mitosis, ensuring genomic stability.
• Integrates growth and stress signals via TOR and other pathways.
• Dysregulation is a hallmark of many cancers, including ovarian cancer and leukemia.
• Provides targets for pharmacological inhibition of G2/M progression.
• Involves conserved regulators such as Cdc25 and Wee1 across eukaryotes.
• Can be modeled in Drosophila and plants to study developmental timing.
• Enables network-based prediction of cell cycle modules.
• Supports development of anti-leukemic strategies targeting transcriptional axes.
• Helps explain how topoisomerase II manages topological constraints during mitosis.
• Facilitates CRISPR-based functional studies of mitotic entry.
What Happens During positive regulation of G2/M transition of mitotic cell cycle?
Activation of Cdk1-cyclin B
In simple terms: The cell flips the master switch that starts mitosis.
The central event in GO:0010971 is the activation of the Cdk1-cyclin B complex. This requires dephosphorylation of inhibitory sites on Cdk1, often mediated by Cdc25 phosphatases. RSK promotes G2/M transition by activating phosphorylation of Cdc25A and Cdc25B, which in turn activate Cdk1. In Drosophila, p115 is required for Cdk1 activation and G2/M transition.
Removal of inhibitory phosphorylation by Wee1
In simple terms: The brake on mitosis is released.
Wee1 kinase adds inhibitory phosphates to Cdk1, keeping the cell in G2. Positive regulation of G2/M transition involves spatiotemporal regulation of Wee1, including its inactivation or degradation, to allow Cdk1 activation. This step is critical for proper timing of mitotic entry.
Upstream signaling by Aurora kinase A and protein kinase D2
In simple terms: Other kinases give the green light for mitosis.
Aurora kinase A and protein kinase D2 form a signaling axis that promotes G2/M progression. Pharmacological inhibition of this axis suppresses G2/M cell cycle progression and proliferation of epithelial ovarian cancer cells. This demonstrates that positive regulation can be targeted therapeutically.
Transcriptional control by GATA1/TAL1/SGMS1
In simple terms: Gene expression programs also push cells into mitosis.
A novel GATA1/TAL1/Sphingomyelin Synthase 1 (SGMS1) transcriptional axis regulates the cell cycle with implications for anti-leukemic strategies. This axis influences G2/M transition, showing that positive regulation occurs at both transcriptional and post-translational levels.
TOR signaling and cell cycle control
In simple terms: Nutrient-sensing pathways influence when cells divide.
The target of rapamycin (TOR) signaling pathway controls cell cycle progression, including G2/M transition, in plants. This highlights the evolutionary conservation of nutrient-dependent regulation of mitotic entry.
Key Genes Involved in GO:0010971 positive regulation of G2/M transition of mitotic cell cycle
The following genes and proteins are experimentally implicated in positive regulation of G2/M transition of mitotic cell cycle.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RSK | Activates Cdc25A and Cdc25B by phosphorylation | Promotes G2/M transition; target in cancer |
| Cdc25A | Phosphatase that activates Cdk1 | Key effector of mitotic entry |
| Cdc25B | Phosphatase that activates Cdk1 | Key effector of mitotic entry |
| Cdk1 | Cyclin-dependent kinase driving mitosis | Central regulator of G2/M |
| Cyclin B | Regulatory subunit of Cdk1 | Required for mitotic entry |
| Wee1 | Inhibitory kinase of Cdk1 | Regulated at G2/M transition |
| Aurora kinase A | Promotes G2/M progression | Target in ovarian cancer |
| Protein kinase D2 | Signals with Aurora kinase A | Suppresses G2/M when inhibited |
| p115 | Required for Cdk1 activation | Drosophila model of G2/M |
| GATA1 | Transcription factor regulating cell cycle | Leukemia implications |
| TAL1 | Transcription factor partner of GATA1 | Leukemia implications |
| SGMS1 | Sphingomyelin synthase 1 | Part of GATA1/TAL1 axis |
| TOR | Nutrient-sensing kinase | Controls cell cycle in plants |
| Topoisomerase II | Manages DNA topology during mitosis | Cell cycle regulation in tobacco |
| Cdc25 | Family of Cdk1-activating phosphatases | Conserved regulators |
How Is positive regulation of G2/M transition of mitotic cell cycle Regulated?
Positive regulation of G2/M transition is controlled by multiple signaling inputs. The TOR pathway integrates nutrient status to influence cell cycle progression, including G2/M, in plants. In human cells, RSK phosphorylates and activates Cdc25A and Cdc25B, which then activate Cdk1. Aurora kinase A and protein kinase D2 form a signaling axis that promotes G2/M progression, and its inhibition blocks proliferation. Wee1 activity is spatiotemporally regulated to permit Cdk1 activation. Transcriptional regulation by GATA1/TAL1/SGMS1 also modulates the cell cycle.
positive regulation of G2/M transition of mitotic cell cycle and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Aurora kinase A | Epithelial ovarian cancer | Knockout or point-mutation in ovarian cancer cell lines |
| Protein kinase D2 | Epithelial ovarian cancer | Knockout or overexpression in ovarian cancer cells |
| GATA1 | Leukemia | Knockout or knock-in in leukemia cell lines |
| TAL1 | Leukemia | Overexpression or knockout in hematopoietic cells |
| Wee1 | Genomic instability / cancer | Point mutation of phosphorylation sites |
Cancer
Dysregulated positive regulation of G2/M transition contributes to cancer. In epithelial ovarian cancer, inhibition of the protein kinase D2/Aurora kinase A axis suppresses G2/M progression and proliferation, suggesting a therapeutic strategy. In leukemia, the GATA1/TAL1/SGMS1 transcriptional axis regulates the cell cycle and has implications for anti-leukemic strategies.
Developmental disorders
Proper control of G2/M transition is essential for normal development. In Drosophila, p115 is required for Cdk1 activation and G2/M transition, and its loss affects development. In plants, TOR signaling controls cell cycle progression, linking nutrient status to growth.
Genomic instability
Wee1 regulation at the G2/M transition is critical for preventing premature mitosis and maintaining genomic integrity. Topoisomerase II dynamics during the cell cycle manage topological constraints during replication and mitotic chromosome condensation, and their perturbation can lead to genome instability.
From positive regulation of G2/M transition of mitotic cell cycle-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does a candidate gene activate Cdk1? | Knockout cell line followed by Western blot for phospho-Cdk1 |
| Does a mutation in a Cdc25 phosphorylation site affect G2/M? | Point mutation knock-in of Cdc25A/B |
| Does overexpression of Aurora kinase A drive proliferation? | Overexpression cell model |
| Where does a protein localize during G2/M? | Tagged knock-in with fluorescent protein |
| Does a transcriptional axis control G2/M genes? | Knockout of GATA1/TAL1 followed by RNA-seq |
| Can network modules predict G2/M regulators? | Bioinformatics analysis of protein abundance |
How to Study the positive regulation of G2/M transition of mitotic cell cycle Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Flow cytometry | DNA content and cell cycle phase distribution | Assessing G2/M arrest or progression |
| Western blot | Protein phosphorylation and expression levels | Detecting Cdc25A/B and Cdk1 activation |
| Live-cell imaging | Subcellular localization and dynamics | Tracking Wee1 or Cdk1 during G2/M |
| RNA-seq | Transcriptome changes | Identifying G2/M gene expression programs |
| Network analysis | Protein abundance correlations | Predicting cell cycle modules |
| CRISPR knockout | Gene function loss | Testing requirement for G2/M transition |
| CRISPR knock-in | Tagged or mutant protein expression | Studying localization or point mutations |
Flow cytometry
Flow cytometry measures DNA content to assess cell cycle distribution, including the G2/M population. It is widely used to evaluate the effects of genetic perturbations on G2/M transition.
Western blotting for phospho-proteins
Western blotting with phospho-specific antibodies detects activating phosphorylation of Cdc25A/B and Cdk1, providing direct evidence of positive regulation.
Live-cell imaging
Live-cell imaging of fluorescently tagged proteins such as Wee1 or Cdk1 allows spatiotemporal analysis of G2/M transition dynamics.
RNA-seq and bioinformatics
RNA-seq and network analysis identify transcriptional programs and modules controlling G2/M transition, as shown for the GATA1/TAL1 axis and cell cycle regulator networks.
How CRISPR Can Be Used to Study GO:0010971 positive regulation of G2/M transition of mitotic cell cycle
Knockout
CRISPR knockout of candidate genes such as RSK, Cdc25A, or Aurora kinase A can test their requirement for G2/M transition. Loss of p115 in Drosophila impairs Cdk1 activation and G2/M transition, demonstrating the power of knockout approaches.
Point Mutation
Point mutation knock-in can be used to abrogate specific phosphorylation sites, for example in Cdc25A or Cdc25B, to determine whether RSK-mediated phosphorylation is required for G2/M transition. Similarly, mutations in Wee1 phosphorylation sites can reveal regulatory mechanisms.
Knock-in
Knock-in of fluorescent or epitope tags allows visualization and biochemical analysis of proteins such as Wee1 or Cdk1 during the G2/M transition. This approach is valuable for studying spatiotemporal regulation.
Overexpression
Overexpression of positive regulators like Aurora kinase A or protein kinase D2 can drive G2/M progression and proliferation, providing gain-of-function models for cancer research.
How EDITGENE Supports positive regulation of G2/M transition of mitotic cell cycle Research
Researchers studying positive regulation of G2/M transition of mitotic cell cycle-related genes often need to determine whether a candidate gene is causally involved in mitotic entry or is merely correlated with proliferation. CRISPR-based models provide the most direct way to establish causality, from complete knockout to precise point mutations and tagged knock-ins.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of G2/M transition of mitotic cell cycle research.
Frequently Asked Questions About positive regulation of G2/M transition of mitotic cell cycle
What is GO:0010971?
GO:0010971 is the Gene Ontology term for positive regulation of G2/M transition of mitotic cell cycle, defined as any signaling pathway that activates or increases the activity of a cyclin-dependent protein kinase to promote entry into mitosis.
What genes are involved in positive regulation of G2/M transition?
Key genes include RSK, Cdc25A, Cdc25B, Cdk1, cyclin B, Wee1, Aurora kinase A, protein kinase D2, p115, GATA1, TAL1, and SGMS1.
How is G2/M transition activated?
It is activated by removal of inhibitory phosphorylation on Cdk1, often through Cdc25 phosphatases, and by activating phosphorylation of Cdc25A/B by kinases such as RSK.
What is the role of Cdc25 in G2/M transition?
Cdc25A and Cdc25B are phosphatases that activate Cdk1 by removing inhibitory phosphates, and their activating phosphorylation by RSK promotes G2/M transition.
How does Wee1 regulate G2/M transition?
Wee1 adds inhibitory phosphates to Cdk1, and its spatiotemporal regulation is required for proper timing of G2/M transition.
What diseases are linked to dysregulated G2/M transition?
Dysregulation is linked to cancers such as epithelial ovarian cancer and leukemia, where uncontrolled proliferation occurs.
Can CRISPR be used to study G2/M transition?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect gene function in G2/M transition.
What methods measure G2/M transition?
Flow cytometry, Western blotting for phospho-proteins, live-cell imaging, and RNA-seq are commonly used.
Is TOR signaling involved in G2/M transition?
Yes, the target of rapamycin (TOR) signaling pathway controls cell cycle progression, including G2/M transition, in plants.
What is the role of Aurora kinase A in G2/M?
Aurora kinase A, together with protein kinase D2, promotes G2/M progression, and their inhibition suppresses proliferation in ovarian cancer cells.
Conclusion
GO:0010971 encompasses the signaling pathways that activate cyclin-dependent kinases to drive mitotic entry. Key regulators such as RSK, Cdc25A/B, Wee1, Aurora kinase A, and protein kinase D2 have been experimentally linked to this process. Dysregulation contributes to cancer and developmental defects, making these pathways attractive therapeutic targets. CRISPR-based models and bioinformatics approaches continue to advance our understanding of G2/M control.
References
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- 2. Ahmad Z et al.. 2019. Cell cycle control by the target of rapamycin signalling pathway in plants.. J Exp Bot 70(8):2275-2284 PMID: 30918972
- 3. Wu CF et al.. 2014. RSK promotes G2/M transition through activating phosphorylation of Cdc25A and Cdc25B.. Oncogene 33(18):2385-94 PMID: 23708659
- 4. Sachdeva A et al.. 2024. Pharmacological inhibition of protein kinase D2/Aurora kinase A signalling axis suppresses G2/M cell cycle progression and proliferation of epithelial ovarian cancer cells.. Pathol Res Pract 260:155390 PMID: 38878668
- 5. Ibar C et al.. 2017. Drosophila p115 is required for Cdk1 activation and G2/M cell cycle transition.. Mech Dev 144(Pt B):191-200 PMID: 28396045
- 6. Masuda H et al.. 2011. Spatiotemporal regulations of Wee1 at the G2/M transition.. Mol Biol Cell 22(5):555-69 PMID: 21233285
- 7. Singh BN et al.. 2017. Dynamics of tobacco DNA topoisomerases II in cell cycle regulation: to manage topological constrains during replication, transcription and mitotic chromosome condensation and segregation.. Plant Mol Biol 94(6):595-607 PMID: 28634865
- 8. Oguz C et al.. 2017. Predicting network modules of cell cycle regulators using relative protein abundance statistics.. BMC Syst Biol 11(1):30 PMID: 28241833
