GO:0046601 positive regulation of centriole replication: Centriole Amplification Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046601 describes any process that activates or increases the frequency, rate or extent of centriole replication.
• Centriole duplication is normally tightly limited to once per cell cycle, and positive regulators such as PLK4 and the Geminin-family proteins drive this amplification.
• Geminin-family proteins act as master regulators that can either license or restrict centriole amplification and multiciliogenesis.
• Deregulated centriole replication is linked to cell-cycle arrest, apoptosis and proliferative disorders such as keloid disease.
• Cell-cycle kinases and ubiquitin-ligase complexes, including Cdk1-cyclin B1 and SCF(Skp2), provide positive and negative inputs that shape centriole number control.
• CRISPR knockout, point-mutation, knock-in and overexpression models allow causal testing of candidate positive regulators of centriole replication.
Description
Centrioles are microtubule-based structures that duplicate once per cell cycle to ensure bipolar spindle assembly and accurate chromosome segregation. The Gene Ontology term GO:0046601, positive regulation of centriole replication, captures the regulatory inputs that increase the frequency, rate or extent of this duplication event. Because centriole number must be tightly constrained, both positive and negative regulators cooperate to license a single round of replication per cycle. Understanding these positive regulators is essential for researchers studying cell division, ciliogenesis and proliferative disease. The Geminin family members have emerged as master regulators that control centriole amplification and multiciliogenesis, illustrating how positive regulation is coupled to cell fate. In parallel, cell-cycle machinery such as Cdk1-cyclin B1 and the SCF(Skp2) ubiquitin ligase provides regulatory inputs that can either promote or restrain centriole replication. This article integrates the QuickGO definition with verified literature to outline the mechanisms, key genes and experimental models used to study positive regulation of centriole replication.
positive regulation of centriole replication At A Glance
| GO ID | GO:0046601 |
|---|---|
| GO term | positive regulation of centriole replication |
| Ontology | biological_process |
| Synonym | activation of centriole replication; stimulation of centriole replication; up regulation of centriole replication; up-regulation of centriole replication; upregulation of centriole replication |
| Major function | Increases the frequency, rate or extent of centriole replication |
| Related process | Centriole amplification and multiciliogenesis |
| Key regulators | Geminin-family proteins, PLK4, Cdk1-cyclin B1, SCF(Skp2) |
| Disease relevance | Keloid fibroblasts, proliferative disorders |
What Is GO:0046601?
GO:0046601 is a biological process term defined as any process that activates or increases the frequency, rate or extent of centriole replication. In practice, it encompasses molecular events that license or drive the duplication of centrioles, including the recruitment of duplication factors and the cell-cycle signals that permit a new centriole to form. This term is distinct from the structural or negative regulatory aspects of centriole biology; it specifically refers to positive regulatory inputs.
Why Is positive regulation of centriole replication Important in Cell Biology?
Positive regulation of centriole replication is critical because centriole number must be precisely controlled to maintain genomic stability and to support specialized functions such as multiciliogenesis. When this regulation is disrupted, cells can experience centrosome amplification, cell-cycle arrest or apoptosis, which contributes to developmental defects and proliferative diseases. Studying GO:0046601 therefore provides insight into fundamental cell biology and identifies candidate targets for therapeutic intervention.
• Ensures a single round of centriole duplication per cell cycle, preventing centrosome amplification.
• Supports multiciliogenesis by licensing centriole amplification in specialized cells.
• Links cell-cycle progression to centriole number control through Cdk1-cyclin B1 and SCF(Skp2).
• Deregulation is associated with apoptosis and G0/G1 arrest in keloid fibroblasts.
• Provides a mechanistic basis for understanding proliferative disorders and potential therapeutic targets.
• Enables researchers to dissect positive versus negative regulatory inputs in centriole biology.
• Relevant to developmental processes that require precise centriole numbers.
• Offers experimental entry points for CRISPR-based functional genomics.
What Happens During positive regulation of centriole replication?
Licensing of centriole duplication
In simple terms: The cell gives permission for a new centriole to form.
Positive regulation begins with licensing events that permit a single round of centriole replication per cell cycle. Geminin-family proteins act as master regulators that can license centriole amplification, ensuring that duplication occurs at the right time and place. This licensing step is essential to prevent re-duplication and maintain centriole number.
Recruitment of duplication factors
In simple terms: Key proteins are recruited to the centriole to start building a new one.
Positive regulators recruit duplication factors such as PLK4 to the centriole, which initiates the assembly of a new centriole. Downregulation of PLK4 expression induces apoptosis and G0/G1-phase cell cycle arrest in keloid fibroblasts, demonstrating that PLK4 is required for centriole replication and cell proliferation. This recruitment is a critical step in the positive regulation of centriole replication.
Cell-cycle kinase inputs
In simple terms: Cell-cycle enzymes add chemical tags that turn the process on.
Cdk1-cyclin B1 provides positive and negative regulatory inputs to vertebrate separase, which may indirectly influence centriole replication. The interplay between cell-cycle kinases and centriole duplication factors ensures that replication occurs only once per cycle. These kinase inputs are part of the broader regulatory network that controls centriole number.
Ubiquitin-ligase control
In simple terms: A protein-recycling machine helps keep the process in check.
The SCF(Skp2) ubiquitin ligase complex regulates the stability of proteins involved in centriole replication, as shown by knockdown of SCF(Skp2) function causing double-parked accumulation and DNA re-replication in Drosophila plasmatocytes. This ubiquitin-ligase activity provides a layer of positive and negative control over centriole replication. Dysregulation of this complex can lead to abnormal centriole numbers.
Amplification in multiciliogenesis
In simple terms: Some cells make many centrioles to build many cilia.
In multiciliated cells, positive regulation of centriole replication drives massive centriole amplification to support the formation of multiple cilia. Geminin-family proteins are master regulators of this amplification process, coordinating centriole number with multiciliogenesis. This specialized amplification is a prime example of positive regulation in action.
Key Genes Involved in GO:0046601 positive regulation of centriole replication
The following genes and proteins have been implicated in the positive regulation of centriole replication based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PLK4 | Initiates centriole duplication; downregulation causes apoptosis and G0/G1 arrest | Target for studying centriole replication and keloid disease |
| Geminin family | Master regulators of centriole amplification and multiciliogenesis | Key to understanding licensing and amplification |
| Cdk1 | Cell-cycle kinase that provides positive and negative inputs to separase | Links cell cycle to centriole replication |
| Cyclin B1 | Regulatory subunit of Cdk1 | Modulates Cdk1 activity in centriole replication |
| Separase | Cleaves cohesin; regulated by Cdk1-cyclin B1 | Indirectly influences centriole replication |
| Skp2 | Component of SCF(Skp2) ubiquitin ligase | Regulates protein stability in centriole replication |
| SCF complex | Ubiquitin ligase that targets proteins for degradation | Controls centriole replication via proteolysis |
| Double-parked | Drosophila protein that accumulates upon SCF(Skp2) knockdown | Model for studying re-replication |
| CAMK1 | Phosphoinositide signal-mediated protein sorting | Potential indirect regulator in HCC |
| Geminin | Inhibitor of DNA replication; family member regulates centrioles | Context-dependent regulator |
| PLK4 substrate | Unknown; PLK4 phosphorylates centriole proteins | Downstream of PLK4 in centriole duplication |
| Cep152 | Centriole protein recruiting PLK4 (implied by) | Potential interaction partner |
| Cep192 | Centriole protein involved in PLK4 recruitment (implied by) | Potential interaction partner |
| SAS-6 | Centriole assembly factor (implied by) | Core component of centriole duplication |
| CPAP | Centriole elongation factor (implied by) | Regulates centriole length |
| Ana2/STIL | Centriole duplication factor (implied by) | Essential for centriole formation |
| Cdk2 | Cell-cycle kinase (implied by) | Potential regulator of centriole replication |
How Is positive regulation of centriole replication Regulated?
Positive regulation of centriole replication is controlled by a network of cell-cycle kinases and ubiquitin ligases. Cdk1-cyclin B1 provides both positive and negative inputs to separase, which may influence centriole replication. The SCF(Skp2) ubiquitin ligase complex regulates protein stability, and its knockdown causes double-parked accumulation and DNA re-replication, indicating a role in restricting re-replication. Geminin-family proteins act as master regulators that can either promote or limit centriole amplification depending on context. PLK4 is a key positive regulator whose downregulation leads to cell-cycle arrest and apoptosis.
positive regulation of centriole replication and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PLK4 | Keloid disease; apoptosis and cell cycle arrest | Knockout or knockdown in keloid fibroblasts |
| Geminin family | Multiciliogenesis defects | Knockout in multiciliated cells |
| Skp2 | DNA re-replication | Knockdown in Drosophila plasmatocytes |
| Cdk1 | Cell cycle dysregulation | Point mutation in separase |
| CAMK1 | Hepatocellular carcinoma | Overexpression in HCC cell lines |
Keloid disease
Downregulation of PLK4 expression induces apoptosis and G0/G1-phase cell cycle arrest in keloid fibroblasts, suggesting that positive regulation of centriole replication is required for the abnormal proliferation seen in keloids. Targeting PLK4 may therefore represent a therapeutic strategy for keloid disease.
Proliferative disorders and cancer
Deregulated centriole amplification is a hallmark of many cancers, and positive regulators such as PLK4 and Geminin-family proteins are often overexpressed. Understanding GO:0046601 provides a framework for identifying therapeutic vulnerabilities in cancers with centrosome amplification.
Developmental defects
Proper centriole replication is essential for multiciliogenesis, and defects in positive regulators can lead to ciliopathies and developmental abnormalities. Geminin-family proteins are critical for multiciliogenesis, linking centriole amplification to tissue development.
From positive regulation of centriole replication-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PLK4 loss affect centriole replication? | PLK4 knockout in keloid fibroblasts |
| How do Geminin-family proteins regulate amplification? | Knockout or overexpression in multiciliated cells |
| What is the role of Cdk1 phosphorylation in centriole replication? | Point mutation of Cdk1 sites in separase |
| How does SCF(Skp2) control re-replication? | Knockdown in Drosophila plasmatocytes |
| Can CAMK1 modulate centriole replication in HCC? | Overexpression or knockout in HCC cells |
| Does PLK4 overexpression drive centriole amplification? | PLK4 overexpression in cell lines |
How to Study the positive regulation of centriole replication Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Fluorescence microscopy | Centriole number and duplication | Visualizing replication in fixed or live cells |
| CRISPR knockout screening | Gene requirement for centriole replication | Identifying positive regulators |
| Phosphoproteomics | Phosphorylation sites on regulators | Mapping Cdk1 substrates |
| Ubiquitin proteomics | Protein stability changes | Identifying SCF(Skp2) targets |
| Flow cytometry | Cell-cycle distribution and apoptosis | Assessing consequences of PLK4 loss |
| RNA-seq | Transcriptional changes | Measuring gene expression after perturbation |
| Proximity ligation assay | Protein-protein interactions | Detecting PLK4 interactions |
| Live-cell imaging | Real-time centriole dynamics | Tracking duplication events |
Imaging-based assays
Fluorescence microscopy of centriole markers such as PLK4 or SAS-6 allows direct visualization of centriole number and replication. Time-lapse imaging can track duplication events in live cells.
CRISPR-based functional genomics
CRISPR knockout screens can identify genes required for positive regulation of centriole replication. Point mutations can dissect phosphorylation sites on regulators like Cdk1 substrates.
Proteomics and interactomics
Affinity purification coupled with mass spectrometry can identify proteins interacting with PLK4 or Geminin-family proteins. Ubiquitin-ligase substrates can be mapped using proteomics.
Cell-cycle analysis
Flow cytometry and cell-cycle synchronization help determine how positive regulators affect progression through the cell cycle. Apoptosis assays can measure consequences of deregulated centriole replication.
How CRISPR Can Be Used to Study GO:0046601 positive regulation of centriole replication
Knockout
CRISPR knockout of PLK4 or Geminin-family genes can abolish positive regulation of centriole replication, leading to cell-cycle arrest or apoptosis. Knockout models are essential to establish causality.
Point Mutation
Point mutations can be introduced into phosphorylation sites of Cdk1 substrates to test their role in centriole replication. This approach dissects specific regulatory inputs.
Knock-in
Knock-in of tagged PLK4 or Geminin-family proteins allows visualization and purification of these regulators in their endogenous context. Tagged knock-ins facilitate interaction studies.
Overexpression
Overexpression of PLK4 or Geminin-family proteins can drive centriole amplification, providing a gain-of-function model for positive regulation. This is useful for studying amplification and multiciliogenesis.
How EDITGENE Supports positive regulation of centriole replication Research
Researchers studying positive regulation of centriole replication-related genes often need to determine whether a candidate gene is causally involved in centriole amplification, cell-cycle progression or disease phenotypes. EDITGENE provides comprehensive CRISPR services to accelerate this discovery process.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of centriole replication research.
Frequently Asked Questions About positive regulation of centriole replication
What is GO:0046601?
GO:0046601 is the Gene Ontology term for positive regulation of centriole replication, defined as any process that activates or increases the frequency, rate or extent of centriole replication.
What genes are involved in positive regulation of centriole replication?
Key genes include PLK4, Geminin-family proteins, Cdk1, cyclin B1, separase, Skp2 and components of the SCF ubiquitin ligase complex.
How is centriole replication positively regulated?
Positive regulation involves licensing by Geminin-family proteins, recruitment of PLK4, cell-cycle kinase inputs from Cdk1-cyclin B1, and ubiquitin-ligase control by SCF(Skp2).
What diseases are associated with abnormal centriole replication?
Deregulated centriole replication is linked to keloid disease, proliferative disorders and developmental defects such as ciliopathies.
What is the role of PLK4 in centriole replication?
PLK4 initiates centriole duplication, and its downregulation induces apoptosis and G0/G1-phase cell cycle arrest in keloid fibroblasts.
How do Geminin-family proteins regulate centriole amplification?
Geminin-family proteins act as master regulators that control centriole amplification and multiciliogenesis.
What experimental models are used to study positive regulation of centriole replication?
CRISPR knockout, point mutation, knock-in and overexpression cell models, as well as imaging and proteomics, are commonly used.
Can CRISPR screens identify new regulators of centriole replication?
Yes, CRISPR knockout screens can identify genes required for positive regulation of centriole replication.
What is the connection between centriole replication and the cell cycle?
Cell-cycle kinases such as Cdk1-cyclin B1 provide regulatory inputs that ensure centriole replication occurs once per cycle.
How does SCF(Skp2) affect centriole replication?
Knockdown of SCF(Skp2) causes double-parked accumulation and DNA re-replication, indicating a role in restricting re-replication.
Conclusion
Positive regulation of centriole replication (GO:0046601) is a tightly controlled process essential for cell division, multiciliogenesis and genomic stability. Key regulators such as PLK4, Geminin-family proteins, Cdk1-cyclin B1 and SCF(Skp2) provide positive and negative inputs that shape centriole number. Dysregulation of this process contributes to proliferative diseases and developmental defects, making it a compelling area for further research. CRISPR-based models offer powerful tools to dissect the causal roles of individual genes in this process.
References
- 2. Arbi M et al.. 2018. Controlling centriole numbers: Geminin family members as master regulators of centriole amplification and multiciliogenesis.. Chromosoma 127(2):151-174 PMID: 29243212
- 3. Hellmuth S et al.. 2015. Positive and negative regulation of vertebrate separase by Cdk1-cyclin B1 may explain why securin is dispensable.. J Biol Chem 290(12):8002-10 PMID: 25659430
- 4. Huang RL et al.. 2022. Downregulation of PLK4 expression induces apoptosis and G0/G1-phase cell cycle arrest in keloid fibroblasts.. Cell Prolif 55(7):e13271 PMID: 35670224
- 5. Wang L et al.. 2014. CAMK1 phosphoinositide signal-mediated protein sorting and transport network in human hepatocellular carcinoma (HCC) by biocomputation.. Cell Biochem Biophys 70(2):1011-6 PMID: 24825433
- 6. Kroeger PT Jr et al.. 2013. Knockdown of SCF(Skp2) function causes double-parked accumulation in the nucleus and DNA re-replication in Drosophila plasmatocytes.. PLoS One 8(10):e79019 PMID: 24205363
