GO:0000278 mitotic cell cycle: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000278 mitotic cell cycle describes progression through the canonical G1, S, G2, and M phases, including genome replication and chromosome segregation into daughter cells.
• Mitotic exit is controlled by conserved checkpoints and regulatory networks, as shown in Saccharomyces cerevisiae.
• Core cell cycle machinery is not only proliferative but also critically involved in the life and death of post-mitotic neurons.
• Sister chromatid cohesion is dynamically regulated during the mitotic cell cycle to ensure faithful chromosome segregation.
• Myt1 kinase couples mitotic cell cycle exit with differentiation in Drosophila, linking cell cycle control to development.
• Genome-wide mapping has identified mammalian cell-cycle invariant and mitotic-specific macroH2A1 domains, providing chromatin-level markers of mitotic progression.
Description
The mitotic cell cycle (GO:0000278) is the most common eukaryotic cell cycle, canonically comprising four successive phases: G1, S, G2, and M. It includes replication of the genome and the subsequent segregation of chromosomes into daughter cells. In some variant cell cycles, nuclear replication or nuclear division may not be followed by cell division, or G1 and G2 phases may be absent. This process is fundamental to growth, development, and tissue homeostasis, and its dysregulation is associated with diseases such as cancer and neurodegeneration. Research into the mitotic cell cycle spans model organisms from yeast to mammals. In Saccharomyces cerevisiae, mitotic exit is regulated by cell cycle checkpoints that ensure proper coordination of events. In metazoans, the core cell cycle machinery is crucially involved in both life and death of post-mitotic neurons, highlighting its importance beyond proliferation. The mitotic cell cycle is also characterized by dynamic chromatin changes; genome-wide identification of mammalian cell-cycle invariant and mitotic-specific macroH2A1 domains has provided insights into chromatin organization during mitosis. Understanding the molecular mechanisms of the mitotic cell cycle is essential for basic biology and for developing therapeutic strategies targeting cell proliferation.
mitotic cell cycle At A Glance
| GO ID | GO:0000278 |
|---|---|
| GO term | mitotic cell cycle |
| Ontology | biological_process |
| Synonym | mitosis |
| Major function | Progression through G1, S, G2, and M phases, including genome replication and chromosome segregation |
| Definition source | QuickGO |
| Related processes | Cell cycle checkpoints, sister chromatid cohesion, mitotic exit |
| Model organisms | Saccharomyces cerevisiae, Drosophila, mammals |
What Is GO:0000278?
The mitotic cell cycle (GO:0000278) is the biological process of progression through the phases of the most common eukaryotic cell cycle, which canonically comprises four successive phases called G1, S, G2, and M. It includes replication of the genome and the subsequent segregation of chromosomes into daughter cells. In some variant cell cycles, nuclear replication or nuclear division may not be followed by cell division, or G1 and G2 phases may be absent.
Why Is mitotic cell cycle Important in Cell Biology?
The mitotic cell cycle is central to cell proliferation, development, and tissue renewal. Its precise regulation ensures genomic stability, and its dysregulation can lead to cancer, developmental disorders, and neurodegeneration. Core cell cycle machinery is crucially involved in both life and death of post-mitotic neurons, indicating that cell cycle components have functions beyond proliferation. In yeast, mitotic exit is tightly controlled by cell cycle checkpoints, providing a paradigm for understanding conserved regulatory mechanisms. Moreover, the mitotic cell cycle is linked to differentiation, as Myt1 kinase couples mitotic cell cycle exit with differentiation in Drosophila. Therefore, studying this process is essential for understanding basic biology and for identifying therapeutic targets.
• Ensures accurate genome replication and chromosome segregation during cell division.
• Dysregulation is a hallmark of cancer and other proliferative disorders.
• Core cell cycle machinery influences the life and death of post-mitotic neurons.
• Checkpoint control of mitotic exit is conserved from yeast to humans.
• Sister chromatid cohesion is dynamically regulated to prevent aneuploidy.
• Mitotic cell cycle exit is coupled with differentiation in developmental contexts.
• Cell cycle re-entry can occur in post-mitotic, terminally differentiated cells, with implications for disease.
• Chromatin domains such as macroH2A1 mark mitotic-specific states.
• Cell cycle perturbation can uncouple mitotic progression and invasive behavior.
• Understanding mitotic cell cycle mechanisms informs cancer therapy and regenerative medicine.
What Happens During mitotic cell cycle?
G1 Phase: Cell Growth and Preparation
In simple terms: The cell grows and prepares to copy its DNA.
During G1 phase, the cell grows and monitors its environment and internal state before committing to DNA replication. This phase is part of the canonical mitotic cell cycle, which comprises G1, S, G2, and M phases. In some variant cell cycles, G1 may be absent. The core cell cycle machinery is active during G1, and its regulation is crucial for the life and death of post-mitotic neurons.
S Phase: DNA Replication
In simple terms: The cell copies its entire genome.
S phase is dedicated to the replication of the genome, ensuring that each daughter cell receives a complete set of chromosomes. This is a defining feature of the mitotic cell cycle. Sister chromatid cohesion is established during S phase and is essential for proper chromosome segregation later in mitosis.
G2 Phase: Checkpoint and Preparation for Mitosis
In simple terms: The cell checks for errors and prepares to divide.
In G2 phase, the cell continues to grow and synthesizes proteins necessary for mitosis. Checkpoints ensure that DNA replication is complete and undamaged before entering M phase. Regulation of mitotic exit by cell cycle checkpoints has been extensively studied in Saccharomyces cerevisiae. Myt1 kinase couples mitotic cell cycle exit with differentiation in Drosophila, highlighting the interplay between cell cycle progression and developmental signals.
M Phase: Mitosis and Cytokinesis
In simple terms: The cell divides its nucleus and cytoplasm.
M phase encompasses mitosis, where chromosomes are segregated into two daughter nuclei, followed by cytokinesis. Sister chromatid cohesion is dynamically regulated during the mitotic cell cycle to ensure faithful chromosome segregation. Mitotic progression is accompanied by specific chromatin changes, such as the formation of mitotic-specific macroH2A1 domains. In post-mitotic cells, cell cycle re-entry can occur, as evidenced in terminally differentiated feline neurons.
Mitotic Exit and Checkpoint Control
In simple terms: The cell ensures division is complete before finishing.
Mitotic exit is a tightly regulated process that ensures the cell has properly segregated its chromosomes before completing division. Cell cycle checkpoints play a critical role in this regulation, as reviewed in Saccharomyces cerevisiae. In Drosophila, Myt1 kinase couples mitotic exit with differentiation, linking cell cycle termination to developmental programs. Perturbation of the cell cycle can uncouple mitotic progression and invasive behavior in post-mitotic cells.
Key Genes Involved in GO:0000278 mitotic cell cycle
The following genes and proteins are key regulators and components of the mitotic cell cycle, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDK1 | Cyclin-dependent kinase 1; drives entry into and progression through mitosis | Core regulator of mitotic cell cycle; target for cell cycle studies |
| CCNB1 | Cyclin B1; regulatory subunit of CDK1 | Controls mitotic entry and exit; widely studied in cell cycle research |
| Myt1 | Kinase that inhibits CDK1; couples mitotic exit with differentiation | Studied in Drosophila for linking cell cycle exit and differentiation |
| CDC20 | Activator of the anaphase-promoting complex; promotes mitotic exit | Key regulator of mitotic exit; studied in yeast and mammals |
| Securin | Inhibits separase; regulates sister chromatid separation | Involved in sister chromatid cohesion and segregation |
| Separase | Cleaves cohesin; enables sister chromatid separation | Central to chromosome segregation during mitosis |
| Cohesin | Holds sister chromatids together until anaphase | Dynamically regulated during mitotic cell cycle |
| macroH2A1 | Histone variant; forms mitotic-specific chromatin domains | Genome-wide mapping identified cell-cycle invariant and mitotic-specific domains |
| Cyclin D | Regulates G1 progression | Core cell cycle machinery in neurons and other cells |
| CDK4/6 | Kinases that drive G1 progression | Targets in cancer and cell cycle studies |
| p53 | Tumor suppressor; monitors DNA damage and cell cycle checkpoints | Frequently studied in cell cycle and cancer research |
| RB1 | Retinoblastoma protein; regulates G1/S transition | Key regulator of cell cycle entry |
| PLK1 | Polo-like kinase 1; regulates mitotic entry and exit | Important for mitotic progression and checkpoint control |
| Aurora A | Kinase involved in centrosome maturation and mitotic entry | Studied in mitosis and cancer |
| Aurora B | Chromosomal passenger kinase; regulates chromosome segregation | Critical for mitotic fidelity |
| Bub1 | Spindle assembly checkpoint kinase | Ensures proper chromosome segregation |
| Mad2 | Spindle assembly checkpoint protein | Prevents anaphase until all chromosomes are attached |
How Is mitotic cell cycle Regulated?
The mitotic cell cycle is regulated by a complex network of checkpoints and kinases. In Saccharomyces cerevisiae, mitotic exit is controlled by cell cycle checkpoints that coordinate the completion of mitosis with cytokinesis. Core cell cycle machinery, including CDKs and cyclins, is crucially involved in both life and death of post-mitotic neurons, indicating that regulation extends beyond proliferation. Myt1 kinase couples mitotic cell cycle exit with differentiation in Drosophila, providing a link between cell cycle regulation and developmental signals. Sister chromatid cohesion is dynamically regulated during the mitotic cell cycle to ensure faithful chromosome segregation. Additionally, cell cycle perturbation can uncouple mitotic progression and invasive behavior in post-mitotic cells.
mitotic cell cycle and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CDK1 | Cancer; cell cycle dysregulation | Knockout or point mutation in cancer cell lines |
| Myt1 | Developmental disorders; differentiation defects | Drosophila knockout or overexpression |
| Cohesin | Aneuploidy; cancer | Knockout or point mutation in mammalian cells |
| macroH2A1 | Chromatin regulation in cancer | Knockout or tagged knock-in in cell lines |
| p53 | Cancer; cell cycle checkpoint defects | Knockout or point mutation in cancer models |
Cancer and Proliferative Disorders
Dysregulation of the mitotic cell cycle is a hallmark of cancer. Core cell cycle machinery is crucially involved in both life and death of post-mitotic neurons, and its misregulation can contribute to tumorigenesis. Checkpoint control of mitotic exit, as studied in yeast, is often compromised in cancer cells, leading to genomic instability. Sister chromatid cohesion defects can cause aneuploidy, a common feature of cancer.
Neurodegeneration and Post-Mitotic Neuron Biology
Core cell cycle machinery is crucially involved in both life and death of post-mitotic neurons. Aberrant cell cycle re-entry in post-mitotic, terminally differentiated feline neurons has been observed, suggesting that cell cycle dysregulation may contribute to neurodegeneration. Understanding how mitotic cell cycle components function in post-mitotic cells is essential for developing therapies for neurodegenerative diseases.
Developmental Disorders and Differentiation
Myt1 kinase couples mitotic cell cycle exit with differentiation in Drosophila, indicating that disruption of this coupling can lead to developmental abnormalities. Cell cycle perturbation can uncouple mitotic progression and invasive behavior in a post-mitotic cell, which may have implications for developmental and metastatic processes.
From mitotic cell cycle-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate mitotic entry? | Knockout cell line (e.g., CRISPR KO) followed by cell cycle analysis |
| Does a point mutation in gene Y affect mitotic exit? | Point mutation knock-in cell line |
| How does gene Z localization change during mitosis? | Tagged knock-in (e.g., GFP) and live-cell imaging |
| Does overexpression of gene W cause mitotic defects? | Overexpression cell line |
| What is the role of gene V in sister chromatid cohesion? | Knockout or knockdown followed by chromosome spreads |
| Does gene U couple mitotic exit with differentiation? | Drosophila overexpression or knockout |
How to Study the mitotic cell cycle Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Mitotic shake-off | Enrichment of mitotic cells | Cell cycle synchronization |
| Flow cytometry | DNA content and cell cycle phase distribution | Analysis of cell cycle progression |
| Genome-wide mapping (e.g., ChIP-seq) | Chromatin domains and histone variants | Identification of mitotic-specific macroH2A1 domains |
| Live-cell imaging | Dynamic protein localization and chromosome segregation | Studying sister chromatid cohesion |
| RNA-seq | Transcriptional changes during cell cycle | Gene expression profiling across cell cycle phases |
| Proteomics | Protein abundance and modifications | Identifying cell cycle-regulated proteins |
| CRISPR knockout screens | Essential genes for mitotic cell cycle | Functional genomics of cell cycle regulators |
| Checkpoint assays | Spindle assembly checkpoint activity | Studying mitotic arrest and exit |
Cell Cycle Synchronization and Flow Cytometry
Synchronization methods such as mitotic shake-off allow researchers to obtain populations of cells at specific cell cycle stages. Flow cytometry can then measure DNA content to assess progression through G1, S, G2, and M phases. These techniques are fundamental for studying the mitotic cell cycle.
Genome-Wide Mapping of Chromatin Domains
Genome-wide identification of mammalian cell-cycle invariant and mitotic-specific macroH2A1 domains provides a method to study chromatin changes during the mitotic cell cycle. This approach can reveal how chromatin organization contributes to mitotic progression and cell cycle regulation.
Live-Cell Imaging of Mitotic Progression
Live-cell imaging using tagged proteins allows real-time visualization of mitotic events such as chromosome segregation and cytokinesis. This method is useful for studying dynamic processes like sister chromatid cohesion and mitotic exit.
Genetic and Pharmacological Perturbation
Knockout, knockdown, or pharmacological inhibition of cell cycle regulators can reveal their functions. For example, studies in Saccharomyces cerevisiae have used genetic approaches to dissect mitotic exit checkpoints. In Drosophila, Myt1 kinase was studied by genetic manipulation to link mitotic exit with differentiation.
How CRISPR Can Be Used to Study GO:0000278 mitotic cell cycle
Knockout
CRISPR knockout of mitotic cell cycle genes can reveal their essential functions. For example, knocking out CDK1 or cyclin B1 leads to cell cycle arrest, helping to define their roles in mitotic progression. Knockout of cohesin subunits results in sister chromatid cohesion defects.
Point Mutation
Point mutations can be introduced to study specific phosphorylation sites or catalytic residues. For instance, mutating Myt1 kinase domains can elucidate its role in coupling mitotic exit with differentiation. Point mutations in checkpoint genes can reveal their contribution to mitotic fidelity.
Knock-in
Knock-in of tagged versions of cell cycle proteins (e.g., GFP) allows live-cell imaging of mitotic dynamics. Tagged macroH2A1 can be used to visualize mitotic-specific chromatin domains. Knock-in of mutant alleles can also model disease-associated variants.
Overexpression
Overexpression of cell cycle regulators can drive cells into mitosis or cause mitotic defects. For example, overexpression of Myt1 in Drosophila affects differentiation. Overexpression of cyclins can lead to premature mitotic entry.
How EDITGENE Supports mitotic cell cycle Research
Researchers studying mitotic cell cycle-related genes often need to determine whether a candidate gene is causally involved in cell cycle progression, checkpoint control, or chromosome segregation. CRISPR-based models provide a powerful way to test these hypotheses by creating precise genetic perturbations in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for mitotic cell cycle research.
Frequently Asked Questions About mitotic cell cycle
What is the mitotic cell cycle?
The mitotic cell cycle (GO:0000278) is the progression through the phases of the most common eukaryotic cell cycle, comprising G1, S, G2, and M phases, including genome replication and chromosome segregation into daughter cells.
What genes are involved in the mitotic cell cycle?
Key genes include CDK1, CCNB1, Myt1, CDC20, separase, cohesin, macroH2A1, and checkpoint genes such as Bub1 and Mad2 [1,4,6,8].
How is mitotic exit regulated?
Mitotic exit is regulated by cell cycle checkpoints and kinases such as Myt1, which couples mitotic exit with differentiation in Drosophila [1,4].
What is the role of sister chromatid cohesion in mitosis?
Sister chromatid cohesion holds sister chromatids together until anaphase and is dynamically regulated during the mitotic cell cycle to ensure faithful chromosome segregation.
Can post-mitotic neurons re-enter the cell cycle?
Yes, evidence of cell cycle re-entry has been observed in post-mitotic, terminally differentiated feline neurons, suggesting that core cell cycle machinery can be reactivated.
What are mitotic-specific macroH2A1 domains?
These are chromatin domains marked by the histone variant macroH2A1 that are specific to mitosis, identified through genome-wide mapping.
How do checkpoints control mitotic progression?
Checkpoints monitor the completion of critical events, such as DNA replication and chromosome attachment, and delay mitotic exit until errors are corrected, as studied in Saccharomyces cerevisiae.
What methods are used to study the mitotic cell cycle?
Common methods include mitotic shake-off, flow cytometry, live-cell imaging, genome-wide mapping, and CRISPR screens [3,6,8].
What diseases are associated with mitotic cell cycle dysregulation?
Cancer, neurodegeneration, and developmental disorders are associated with defects in mitotic cell cycle regulation [2,4,5].
How can CRISPR be used to study mitotic cell cycle genes?
CRISPR can create knockout, point mutation, knock-in, and overexpression models to dissect gene function in mitotic progression and checkpoint control [1,4,6,8].
Conclusion
The mitotic cell cycle (GO:0000278) is a fundamental biological process that ensures accurate genome replication and chromosome segregation. Its regulation by checkpoints and core cell cycle machinery is conserved across eukaryotes. Dysregulation of this process is linked to cancer, neurodegeneration, and developmental disorders [2,4,5]. Advances in CRISPR-based models and genome-wide screening are accelerating the discovery of new regulators and therapeutic targets. EDITGENE provides comprehensive services to support mitotic cell cycle research, from custom cell models to bioinformatics analysis.
References
- 1. Matellán L et al.. 2020. Regulation of Mitotic Exit by Cell Cycle Checkpoints: Lessons From Saccharomyces cerevisiae.. Genes (Basel) 11(2) PMID: 32059558
- 2. Marlier Q et al.. 2020. Core cell cycle machinery is crucially involved in both life and death of post-mitotic neurons.. Cell Mol Life Sci 77(22):4553-4571 PMID: 32476056
- 3. Kato TA. 2025. Mitotic Shake-Off and Cell Cycle Synchronization.. Methods Mol Biol 2933:81-85 PMID: 40418477
- 4. Willms RJ et al.. 2020. Myt1 Kinase Couples Mitotic Cell Cycle Exit with Differentiation in Drosophila.. Cell Rep 33(7):108400 PMID: 33207203
- 5. Wisnet K et al.. 2022. Evidence of cell cycle re-entry in post-mitotic, terminally differentiated feline neurons.. Histochem Cell Biol 158(2):193-198 PMID: 35551458
- 6. Zhang L et al.. 2023. Genome-wide identification of mammalian cell-cycle invariant and mitotic-specific macroH2A1 domains.. Biosci Trends 17(5):393-400 PMID: 37778979
- 7. Martinez MAQ et al.. 2024. Cell cycle perturbation uncouples mitotic progression and invasive behavior in a post-mitotic cell.. Differentiation 137:100765 PMID: 38522217
- 8. Zheng G et al.. 2015. Regulation of sister chromatid cohesion during the mitotic cell cycle.. Sci China Life Sci 58(11):1089-98 PMID: 26511516
