GO:0045842 positive regulation of mitotic metaphase/anaphase transition: Cell Cycle Checkpoint Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045842 describes the biological process that activates or increases the frequency, rate, or extent of the metaphase-to-anaphase transition during mitosis, triggered by activation of the anaphase promoting complex by Cdc20/Sleepy homolog, leading to Securin degradation.
• DNA damage during mitosis delays the metaphase/anaphase transition via the spindle-assembly checkpoint, directly linking genomic integrity surveillance to this regulatory process.
• N-terminal acetyltransferases Naa50 and NatA have opposing functions in sister-chromatid cohesion, a prerequisite for proper metaphase/anaphase progression.
• FAM64A mRNA expression is associated with clinicopathological features and prognosis in gynecological cancers, highlighting the relevance of metaphase/anaphase regulators in oncology.
• Protein-protein interaction network analysis can reveal relationships between breast and colon cancer, implicating cell cycle regulatory proteins in tumorigenesis.
• Transcriptional responses to gibberellic acid in Armillaria gallica provide a fungal model for studying conserved cell cycle regulatory mechanisms.
Description
The metaphase-to-anaphase transition is a critical checkpoint in mitosis, ensuring that sister chromatids are properly segregated before cell division completes. GO:0045842, positive regulation of mitotic metaphase/anaphase transition, encompasses the molecular events that activate or accelerate this transition, primarily through the anaphase promoting complex/cyclosome (APC/C) and its coactivator Cdc20. This process is essential for maintaining genomic stability, and its dysregulation is associated with chromosomal instability and cancer. Understanding the positive regulation of this transition is fundamental for researchers studying cell cycle control, checkpoint signaling, and therapeutic strategies targeting proliferative diseases. DNA damage during mitosis has been shown to delay the metaphase/anaphase transition via the spindle-assembly checkpoint, demonstrating the tight integration between DNA repair and cell cycle progression. Additionally, N-terminal acetyltransferases such as Naa50 and NatA play opposing roles in sister-chromatid cohesion, which is a prerequisite for the proper execution of the metaphase/anaphase transition. These findings underscore the complexity of the regulatory networks that govern this critical mitotic event.
positive regulation of mitotic metaphase/anaphase transition At A Glance
| GO ID | GO:0045842 |
|---|---|
| GO term | positive regulation of mitotic metaphase/anaphase transition |
| Ontology | biological_process |
| Synonym | activation of mitotic metaphase/anaphase transition; stimulation of mitotic metaphase/anaphase transition; up regulation of mitotic metaphase/anaphase transition; up-regulation of mitotic metaphase/anaphase transition; upregulation of mitotic metaphase/anaphase transition |
| Major function | Activates or increases the frequency, rate, or extent of the metaphase-to-anaphase transition during mitosis, primarily through APC/C activation by Cdc20 and Securin degradation. |
| Trigger | Activation of the anaphase promoting complex by Cdc20/Sleepy homolog. |
| Key consequence | Degradation of Securin, leading to separase activation and sister chromatid separation. |
| Related checkpoint | Spindle-assembly checkpoint (SAC) delays the transition upon DNA damage during mitosis. |
| Regulatory modifiers | N-terminal acetyltransferases Naa50 and NatA have opposing functions in sister-chromatid cohesion. |
What Is GO:0045842?
GO:0045842 is defined as any process that activates or increases the frequency, rate, or extent of the cell cycle process in which a cell progresses from metaphase to anaphase during mitosis. This progression is triggered by the activation of the anaphase promoting complex by Cdc20/Sleepy homolog, which results in the degradation of Securin. In simpler terms, it is the set of molecular events that push the cell past the point of no return in mitosis, ensuring that chromosomes separate correctly and on time.
Why Is positive regulation of mitotic metaphase/anaphase transition Important in Cell Biology?
The positive regulation of the mitotic metaphase/anaphase transition is fundamental to genomic stability because it ensures the timely and accurate separation of sister chromatids. Errors in this process lead to aneuploidy, a hallmark of cancer and developmental disorders. The spindle-assembly checkpoint directly monitors this transition, and DNA damage during mitosis can delay it to allow repair, as shown in human cells. Moreover, regulators such as Naa50 and NatA modulate sister-chromatid cohesion, affecting the fidelity of chromosome segregation. In cancer research, genes involved in this transition, such as FAM64A, have prognostic significance in gynecological cancers, and protein interaction networks link cell cycle regulators to breast and colon cancer. Therefore, studying GO:0045842 provides insights into basic cell biology and identifies potential therapeutic targets.
• Ensures faithful chromosome segregation and prevents aneuploidy.
• Integrates with the spindle-assembly checkpoint to delay transition upon DNA damage.
• Regulated by N-terminal acetyltransferases Naa50 and NatA, which affect sister-chromatid cohesion.
• Dysregulation is linked to cancer, as shown by prognostic significance of FAM64A in gynecological cancers.
• Protein interaction networks connect metaphase/anaphase regulators to breast and colon cancer.
• Provides a model for studying conserved cell cycle mechanisms across species, including fungi.
• Potential target for chemotherapeutic strategies aiming to induce mitotic catastrophe.
• Essential for understanding developmental processes and tissue homeostasis.
• Offers insights into the molecular basis of chromosomal instability disorders.
• Facilitates research on the coordination between DNA repair and cell cycle progression.
What Happens During positive regulation of mitotic metaphase/anaphase transition?
Activation of the Anaphase Promoting Complex by Cdc20
In simple terms: A molecular machine called APC/C gets switched on by Cdc20 to start chromosome separation.
The central event in GO:0045842 is the activation of the anaphase promoting complex/cyclosome (APC/C) by its coactivator Cdc20 (also known as Sleepy homolog in some organisms). This activation triggers the ubiquitination and subsequent degradation of Securin, a protein that inhibits separase. Once Securin is degraded, separase becomes active and cleaves cohesin, allowing sister chromatids to separate. This process is tightly regulated to ensure that all chromosomes are properly attached to the spindle before anaphase begins.
Spindle-Assembly Checkpoint and DNA Damage Response
In simple terms: If DNA is damaged during mitosis, a checkpoint delays chromosome separation to allow repair.
The spindle-assembly checkpoint (SAC) monitors kinetochore-microtubule attachments and delays the metaphase/anaphase transition until all chromosomes are correctly bi-oriented. DNA damage during mitosis can activate the SAC, leading to a delay in the transition. Mikhailov et al. demonstrated that DNA damage during mitosis in human cells delays the metaphase/anaphase transition via the spindle-assembly checkpoint, highlighting the integration of DNA damage surveillance with cell cycle progression.
Role of N-Terminal Acetyltransferases in Sister-Chromatid Cohesion
In simple terms: Enzymes that modify proteins affect how tightly sister chromosomes stick together before separation.
N-terminal acetyltransferases Naa50 and NatA have opposing functions in sister-chromatid cohesion, a process that must be resolved for the metaphase/anaphase transition to occur. Rong et al. showed that these enzymes regulate cohesion establishment and dissolution, thereby influencing the timing and fidelity of the transition. This adds an additional layer of regulation to GO:0045842 beyond the canonical APC/C pathway.
Transcriptional and Signaling Inputs
In simple terms: External signals and gene expression changes can influence when cells divide.
Transcriptional responses to signaling molecules such as gibberellic acid in the fungus Armillaria gallica have been characterized, revealing conserved cell cycle regulatory mechanisms. In human cells, the expression of genes like FAM64A is associated with clinicopathological features in gynecological cancers, suggesting that transcriptional regulation of metaphase/anaphase regulators contributes to disease progression. These inputs modulate the positive regulation of the transition in response to developmental and environmental cues.
Key Genes Involved in GO:0045842 positive regulation of mitotic metaphase/anaphase transition
The following genes and proteins are central to the positive regulation of the mitotic metaphase/anaphase transition, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| APC/C | Ubiquitin ligase that targets Securin for degradation upon activation by Cdc20 | Core machinery of the transition; target for cell cycle inhibitors |
| CDC20 | Coactivator of APC/C; activates the complex to trigger Securin degradation | Essential for metaphase/anaphase transition; deregulated in cancers |
| Securin (PTTG1) | Inhibits separase; degraded by APC/C-Cdc20 to allow sister chromatid separation | Its degradation is the key event in the transition |
| Separase (ESPL1) | Cleaves cohesin to separate sister chromatids upon Securin degradation | Effector of chromosome segregation |
| Naa50 | N-terminal acetyltransferase; promotes sister-chromatid cohesion | Opposes NatA; affects transition fidelity |
| NatA | N-terminal acetyltransferase complex; opposes Naa50 in cohesion | Regulates cohesion and transition |
| FAM64A | Involved in cell cycle regulation; mRNA expression prognostic in gynecological cancers | Potential biomarker and therapeutic target |
| Spindle-assembly checkpoint proteins (e.g., MAD2, BUBR1) | Monitor kinetochore attachments; delay transition upon DNA damage | Key regulators of transition timing |
| Cyclin B1 | Regulates CDK1 activity; must be degraded for anaphase onset | Coordinated with APC/C activation |
| CDK1 | Mitotic kinase; phosphorylates APC/C and other targets | Controls entry and progression through mitosis |
| Cohesin complex | Holds sister chromatids together; cleaved by separase | Substrate of separase; essential for transition |
| Aurora B kinase | Regulates chromosome bi-orientation and SAC signaling | Modulates transition timing |
| Plk1 | Polo-like kinase; promotes APC/C activation and mitotic progression | Regulates positive transition |
| Cdh1 | APC/C coactivator in late mitosis/G1; opposes Cdc20 | Balances transition regulation |
| Mps1 | Kinase involved in SAC; monitors kinetochore attachment | Affects transition delay |
| Bub3 | SAC component; interacts with BubR1 and Mad2 | Regulates checkpoint signaling |
| Mad2 | SAC component; inhibits APC/C until attachments are correct | Prevents premature transition |
| CENP-E | Kinesin motor; required for chromosome congression and SAC satisfaction | Influences transition onset |
How Is positive regulation of mitotic metaphase/anaphase transition Regulated?
The positive regulation of the mitotic metaphase/anaphase transition is controlled by multiple layers of regulation. The spindle-assembly checkpoint (SAC) acts as a negative regulator that delays the transition until all chromosomes are properly attached to the spindle. DNA damage during mitosis can activate the SAC, leading to a delay in the metaphase/anaphase transition. N-terminal acetyltransferases Naa50 and NatA have opposing functions in sister-chromatid cohesion, thereby modulating the transition. Additionally, transcriptional responses to signaling molecules such as gibberellic acid in fungi indicate conserved regulatory inputs. In cancer, the expression of FAM64A is associated with clinicopathological features, suggesting that transcriptional deregulation of cell cycle genes contributes to disease. Protein-protein interaction networks further reveal connections between cell cycle regulators and cancer pathways.
positive regulation of mitotic metaphase/anaphase transition and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CDC20 | Cancer (various), chromosomal instability | Knockout or overexpression in cancer cell lines |
| FAM64A | Gynecological cancers (prognostic marker) | Knockdown/overexpression in HeLa or ovarian cancer cells |
| Naa50 | Developmental disorders, cohesion defects | Point mutation or knockout in zebrafish or human cells |
| NatA | Cohesion defects, potential cancer | Knockout in HEK293T cells |
| SAC genes (e.g., BUBR1) | Mosaic variegated aneuploidy, cancer | Knock-in of patient mutations in iPSCs |
Cancer and Chromosomal Instability
Dysregulation of the positive regulation of the mitotic metaphase/anaphase transition leads to chromosomal instability (CIN), a hallmark of many cancers. Overexpression of CDC20 or loss of SAC components can cause premature anaphase onset, resulting in aneuploidy. FAM64A mRNA expression has prognostic significance in gynecological cancers, indicating that cell cycle regulators are clinically relevant. Protein interaction network analysis has linked cell cycle proteins to breast and colon cancer, further supporting the role of transition regulators in tumorigenesis.
Developmental Disorders and Aneuploidy
Errors in chromosome segregation during mitosis can cause developmental disorders such as mosaic variegated aneuploidy (MVA), which is associated with mutations in SAC genes. The tight regulation of the metaphase/anaphase transition by the SAC ensures genomic integrity. N-terminal acetyltransferases Naa50 and NatA, which affect sister-chromatid cohesion, are also implicated in developmental processes.
Fungal Pathogenesis and Conserved Cell Cycle Control
In the fungus Armillaria gallica, transcriptional responses to gibberellic acid reveal conserved cell cycle regulatory mechanisms that may influence pathogenesis. This highlights the broader relevance of GO:0045842 beyond human disease, offering insights into fungal biology and potential antifungal targets.
From positive regulation of mitotic metaphase/anaphase transition-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of CDC20 arrest cells in metaphase? | CRISPR knockout of CDC20 in HeLa cells followed by live-cell imaging |
| Does a point mutation in Securin prevent its degradation? | Knock-in of non-degradable Securin mutant in RPE1 cells |
| Can overexpression of FAM64A drive proliferation? | Overexpression of FAM64A in ovarian cancer cell lines |
| How does Naa50 acetylation affect cohesion? | Point mutation of Naa50 catalytic residue in human cells |
| Does tagging APC/C subunits reveal dynamics? | Knock-in of fluorescent tags (e.g., GFP) at endogenous loci |
| What is the transcriptional response to GA3 in fungi? | RNA-seq of Armillaria gallica treated with GA3 |
How to Study the positive regulation of mitotic metaphase/anaphase transition Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Timing of metaphase/anaphase transition | Assessing SAC delays upon DNA damage |
| CRISPR knockout | Loss-of-function effects on transition | Validating essential genes like CDC20 |
| RNA-seq | Transcriptional changes in cell cycle genes | Profiling responses to GA3 in fungi |
| Proteomics | Protein degradation and ubiquitination | Monitoring Securin degradation |
| Protein-protein interaction network | Functional relationships among regulators | Linking cell cycle proteins to cancer |
| Immunofluorescence | Localization of mitotic proteins | Visualizing Naa50/NatA at centromeres |
| Flow cytometry | Cell cycle profile and aneuploidy | Detecting chromosomal instability |
Live-Cell Imaging of Chromosome Dynamics
Live-cell imaging using fluorescently tagged histones or kinetochore proteins allows real-time visualization of the metaphase/anaphase transition. This method can quantify the duration of metaphase and detect delays caused by DNA damage or SAC activation.
RNA Interference and CRISPR Screens
High-throughput RNAi or CRISPR screens can identify genes that positively regulate the transition. For example, knockdown of FAM64A affects proliferation in gynecological cancer cells. Such screens are powerful for discovering novel regulators.
Proteomics and Ubiquitination Assays
Mass spectrometry-based proteomics can monitor the degradation of Securin and other APC/C substrates. Ubiquitination assays in vitro or in cells can measure APC/C activity.
Transcriptomics and Network Analysis
RNA-seq and protein-protein interaction network analysis reveal transcriptional and post-translational relationships. For instance, network analysis has linked cell cycle proteins to breast and colon cancer, and transcriptional responses to GA3 in fungi have been characterized.
How CRISPR Can Be Used to Study GO:0045842 positive regulation of mitotic metaphase/anaphase transition
Knockout
CRISPR knockout of genes such as CDC20 or separase can be used to study their essential roles in the metaphase/anaphase transition. Complete knockout typically causes metaphase arrest, confirming positive regulatory function. Conditional knockout systems allow temporal control.
Point Mutation
Introducing point mutations in genes like Securin (e.g., at the destruction box) can prevent its degradation, leading to a dominant-negative effect that blocks the transition. This approach helps dissect specific residues required for regulation.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) at endogenous loci enables real-time tracking of proteins like APC/C subunits or Securin. Knock-in of disease-associated mutations (e.g., in SAC genes) can model aneuploidy disorders.
Overexpression
Overexpression of positive regulators such as CDC20 or FAM64A can accelerate the transition and promote proliferation, providing insights into oncogenic mechanisms. Inducible overexpression systems allow controlled studies.
How EDITGENE Supports positive regulation of mitotic metaphase/anaphase transition Research
Researchers studying positive regulation of mitotic metaphase/anaphase transition-related genes often need to determine whether a candidate gene is causally involved in the regulation of this critical cell cycle event. EDITGENE provides comprehensive CRISPR-based services to enable such investigations, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of mitotic metaphase/anaphase transition research.
Frequently Asked Questions About positive regulation of mitotic metaphase/anaphase transition
What is GO:0045842?
GO:0045842 is the Gene Ontology term for positive regulation of mitotic metaphase/anaphase transition, defined as any process that activates or increases the frequency, rate, or extent of the cell cycle process in which a cell progresses from metaphase to anaphase during mitosis, triggered by activation of the anaphase promoting complex by Cdc20/Sleepy homolog, resulting in Securin degradation.
What genes are involved in positive regulation of mitotic metaphase/anaphase transition?
Key genes include CDC20, APC/C subunits, Securin (PTTG1), Separase (ESPL1), Naa50, NatA, and FAM64A, among others.
How does DNA damage affect the metaphase/anaphase transition?
DNA damage during mitosis delays the metaphase/anaphase transition via the spindle-assembly checkpoint, allowing time for repair.
What is the role of Naa50 in sister-chromatid cohesion?
Naa50 is an N-terminal acetyltransferase that promotes sister-chromatid cohesion, opposing the function of NatA, and thus influences the metaphase/anaphase transition.
Is FAM64A a prognostic marker in cancer?
Yes, FAM64A mRNA expression has clinicopathological and prognostic significance in gynecological cancers.
What experimental models are used to study GO:0045842?
Common models include CRISPR knockout/knock-in cell lines, live-cell imaging, RNA-seq, and protein interaction network analysis.
How can CRISPR help study the metaphase/anaphase transition?
CRISPR allows precise knockout, point mutation, knock-in, and overexpression of genes like CDC20 or Securin to dissect their roles in the transition.
What is the spindle-assembly checkpoint?
The spindle-assembly checkpoint is a surveillance mechanism that delays anaphase until all chromosomes are properly attached to the spindle, preventing premature transition.
Which diseases are linked to defects in metaphase/anaphase transition?
Cancer and developmental disorders such as mosaic variegated aneuploidy are linked to defects in this transition.
How does EDITGENE support research on GO:0045842?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression cell models, library screening, and bioinformatics services to study genes involved in this transition.
Conclusion
The positive regulation of the mitotic metaphase/anaphase transition (GO:0045842) is a tightly controlled process essential for genomic stability. It integrates signals from the spindle-assembly checkpoint, DNA damage response, and N-terminal acetyltransferases to ensure timely sister chromatid separation. Dysregulation of this process contributes to cancer and developmental disorders, making it a critical area of research. Advances in CRISPR-based models and high-throughput methods continue to uncover new regulators and therapeutic opportunities. EDITGENE offers comprehensive services to support these investigations, from gene editing to bioinformatics analysis.
References
- 1. Cai G et al.. 2023. Characterization of the transcriptional responses of Armillaria gallica 012m to GA3.. Arch Microbiol 205(9):308 PMID: 37594611
- 2. Zheng HC et al.. 2023. A bioinformatics analysis of the clinicopathological and prognostic significance of FAM64A mRNA expression in gynecological cancers.. J Obstet Gynaecol 43(1):2216280 PMID: 37227120
- 3. Mikhailov A et al.. 2002. DNA damage during mitosis in human cells delays the metaphase/anaphase transition via the spindle-assembly checkpoint.. Curr Biol 12(21):1797-806 PMID: 12419179
- 4. Rong Z et al.. 2016. Opposing Functions of the N-terminal Acetyltransferases Naa50 and NatA in Sister-chromatid Cohesion.. J Biol Chem 291(36):19079-91 PMID: 27422821
- 5. Zamanian-Azodi M et al.. 2015. Protein-Protein Interaction Network could reveal the relationship between the breast and colon cancer.. Gastroenterol Hepatol Bed Bench 8(3):215-24 PMID: 26328044
