GO:0000242 pericentriolar material: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000242 pericentriolar material (PCM) is a network of small fibers surrounding centrioles that contains the microtubule nucleating activity of the centrosome.
• The PCM is not amorphous; super-resolution microscopy has revealed a structured, layered architecture with distinct protein subdomains.
• PCM assembly is dynamic and can self-assemble in interphase cells even in the absence of centrioles.
• Key PCM proteins include CDK5RAP2, CEP192, pericentrin (PCNT), and gamma-tubulin, which together nucleate and anchor microtubules.
• PCM dysfunction is linked to cancer, neurodevelopmental disorders, and premature aging, making it a target for CRISPR-based disease modeling.
• CRISPR knockout, point mutation, knock-in, and overexpression models are essential for dissecting PCM gene function and therapeutic potential.
Description
The pericentriolar material (PCM) is a structured network of small fibers that surrounds the centrioles in cells and contains the microtubule nucleating activity of the centrosome. As a critical component of the centrosome, the PCM is responsible for nucleating and anchoring microtubules, thereby organizing the microtubule cytoskeleton during interphase and mitosis. The term GO:0000242 (pericentriolar material) captures this cellular component, which is essential for diverse processes including cell division, polarity, and intracellular transport. Understanding the PCM is fundamental for researchers studying centrosome biology, because defects in PCM assembly or function are associated with a range of human diseases, from cancer to neurodevelopmental disorders. Recent advances in super-resolution microscopy have revealed that the PCM is not an amorphous cloud but a highly organized, layered structure with distinct protein subdomains. Moreover, studies have shown that the PCM can self-assemble in interphase cells even when centrioles are absent, highlighting its dynamic and autonomous properties. This article provides a comprehensive overview of the PCM, covering its definition, structure, key genes, regulatory mechanisms, disease relevance, and the CRISPR-based research methods used to study it.
pericentriolar material At A Glance
| GO ID | GO:0000242 |
|---|---|
| GO term | pericentriolar material |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Microtubule nucleation and anchoring; centrosome organization |
| Definition | A network of small fibers that surrounds the centrioles in cells; contains the microtubule nucleating activity of the centrosome |
| Key components | CDK5RAP2, CEP192, pericentrin (PCNT), gamma-tubulin, and others |
| Related diseases | Cancer, microcephaly, Seckel syndrome, and other centrosome-related disorders |
What Is GO:0000242?
According to the Gene Ontology, GO:0000242 pericentriolar material is defined as a network of small fibers that surrounds the centrioles in cells and contains the microtubule nucleating activity of the centrosome. In simpler terms, it is the protein-rich matrix that forms a halo around the centrioles and serves as the primary site for microtubule nucleation, making it indispensable for centrosome function.
Why Is pericentriolar material Important in Cell Biology?
The pericentriolar material is essential for proper centrosome function, which in turn governs cell division, polarity, and signaling. Because the PCM contains the microtubule nucleating activity of the centrosome, its dysfunction leads to mitotic defects, genomic instability, and developmental abnormalities. Researchers studying cancer, neurodevelopmental disorders, and aging rely on understanding PCM biology to identify therapeutic targets and disease mechanisms.
• PCM is the primary site of microtubule nucleation in cells, critical for spindle assembly and chromosome segregation.
• Mutations in PCM genes such as PCNT and CDK5RAP2 cause microcephaly and other neurodevelopmental disorders.
• PCM amplification is observed in many cancers and correlates with poor prognosis.
• PCM self-assembly properties make it a model for studying biomolecular condensation.
• Super-resolution imaging has revealed PCM subdomains, providing new insights into its organization.
• PCM proteins are targets for CRISPR-based knockout and knock-in studies to model human diseases.
• PCM dynamics are regulated by cell cycle kinases, offering points for pharmacological intervention.
• Understanding PCM maintenance after centriole loss is relevant to aging and degenerative diseases.
What Happens During pericentriolar material?
Assembly and Recruitment
In simple terms: The PCM is built by recruiting specific proteins around the centrioles.
During the cell cycle, PCM components such as CDK5RAP2 and CEP192 are recruited to the centrioles, forming a scaffold that expands in mitosis. This process is regulated by kinases like PLK1 and Aurora A, which phosphorylate PCM proteins to promote their assembly. Recent studies show that PCM can self-assemble in interphase cells even without centrioles, indicating an intrinsic assembly mechanism.
Microtubule Nucleation
In simple terms: The PCM acts as a factory for making microtubules.
The PCM contains gamma-tubulin ring complexes (gamma-TuRCs) that nucleate microtubules. Pericentrin and CDK5RAP2 anchor gamma-TuRCs to the PCM, enabling microtubule growth. This nucleation activity is essential for spindle formation and proper chromosome segregation during mitosis.
Structural Organization
In simple terms: The PCM is not a random cloud but has a structured, layered architecture.
Super-resolution microscopy has revealed that the PCM consists of distinct subdomains, with proteins like pericentrin forming a lattice that organizes the material. This architecture is dynamic and changes during the cell cycle, with the PCM expanding in mitosis and compacting in interphase.
Maintenance and Disassembly
In simple terms: The PCM is maintained and eventually disassembled as cells progress through the cycle.
After mitosis, the PCM is partially disassembled, and its components are recycled for the next cycle. In cells that lose their centrioles, the PCM can be maintained through alternative mechanisms, as shown in studies of centriole degeneration. This maintenance is crucial for cell survival under stress conditions.
Key Genes Involved in GO:0000242 pericentriolar material
The following genes encode key proteins that localize to or regulate the pericentriolar material, and they are frequently studied using CRISPR-based approaches.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CDK5RAP2 | PCM scaffold protein; recruits gamma-TuRC | Mutations cause microcephaly; target for knockout studies |
| CEP192 | Essential for PCM assembly and centriole duplication | Knockout leads to mitotic defects; studied in cancer models |
| PCNT | Major PCM component; anchors gamma-TuRC | Mutations linked to microcephalic osteodysplastic primordial dwarfism type II |
| TUBG1 | Gamma-tubulin; core of gamma-TuRC | Knockout disrupts microtubule nucleation; used in functional studies |
| TUBGCP2 | Gamma-TuRC component | Mutations associated with neurodevelopmental disorders |
| TUBGCP3 | Gamma-TuRC component | Required for PCM-mediated nucleation |
| TUBGCP4 | Gamma-TuRC component | Knockout affects spindle assembly |
| TUBGCP5 | Gamma-TuRC component | Implicated in Prader-Willi syndrome |
| TUBGCP6 | Gamma-TuRC component | Mutations cause microcephaly |
| PLK1 | Kinase regulating PCM assembly | Inhibitors used in cancer therapy; knockout causes mitotic arrest |
| AURKA | Kinase promoting PCM recruitment | Overexpression common in cancers; target for CRISPR studies |
| CEP152 | PCM protein; centriole duplication | Mutations cause Seckel syndrome and microcephaly |
| CEP63 | Centrosomal protein; PCM organization | Knockout leads to mitotic defects |
| SASS6 | Centriole assembly; PCM recruitment | Required for PCM formation |
| STIL | Centriole duplication; PCM integrity | Mutations linked to microcephaly |
| CPAP | Centriole elongation; PCM association | Mutations cause microcephaly |
| PCM1 | PCM component; centriolar satellite protein | Aggregation maintains survival under replication stress |
How Is pericentriolar material Regulated?
The assembly and dynamics of the pericentriolar material are tightly regulated by cell cycle kinases, particularly PLK1 and Aurora A, which phosphorylate PCM components to promote recruitment and expansion during mitosis. Additionally, the PCM can self-assemble in interphase cells through a process that may involve liquid-liquid phase separation, as shown in cells lacking centrioles. Under replication stress, PCM1 aggregation helps maintain cell survival, indicating a stress-responsive regulatory mechanism.
pericentriolar material and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PCNT | Microcephalic osteodysplastic primordial dwarfism type II | Knockout in HEK293T or neural progenitor cells |
| CDK5RAP2 | Primary microcephaly | Knockout in mouse models or iPSCs |
| PLK1 | Cancer (various solid tumors) | Overexpression or knockout in cancer cell lines |
| AURKA | Cancer (breast, colon) | Point mutation knock-in to study kinase activity |
| PCM1 | Replication stress survival | Knockout in cancer cells to assess aggregation |
Cancer
PCM amplification and overexpression of PCM proteins such as PLK1 and Aurora A are common in many cancers and correlate with genomic instability and poor prognosis. Targeting PCM assembly pathways is a potential therapeutic strategy, and CRISPR knockout of PCM genes in cancer cell lines is used to study their role in tumorigenesis.
Neurodevelopmental Disorders
Mutations in PCM genes, including PCNT, CDK5RAP2, and CEP152, cause microcephaly and Seckel syndrome, characterized by reduced brain size and growth retardation. These mutations often disrupt PCM assembly and microtubule nucleation, leading to mitotic defects in neural progenitors.
Aging and Degenerative Diseases
Loss of centrioles and PCM maintenance defects are associated with aging and degenerative diseases. Studies in model organisms have shown that PCM components can aggregate under stress, and this aggregation may be protective or detrimental depending on context.
From pericentriolar material-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CDK5RAP2 disrupt PCM assembly? | CRISPR knockout in HEK293T cells |
| How does PCNT mutation affect microtubule nucleation? | Point mutation knock-in in iPSCs |
| Can PCM self-assemble without centrioles? | Knockout of centriole genes in interphase cells |
| What is the role of PLK1 in PCM expansion? | Overexpression of PLK1 in HeLa cells |
| Does PCM1 aggregation protect against replication stress? | Knockout of PCM1 in cancer cells |
| How does Aurora A regulate PCM recruitment? | Tagged knock-in of AURKA in U2OS cells |
How to Study the pericentriolar material Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Super-resolution microscopy | PCM architecture and protein localization | Studying PCM subdomains |
| Proteomics | PCM protein composition and modifications | Identifying novel PCM components |
| Live-cell imaging | PCM dynamics and microtubule nucleation | Tracking cell cycle-dependent assembly |
| CRISPR knockout screening | Genes required for PCM function | Discovering regulators and drug targets |
| RNA-seq | Transcriptional changes upon PCM perturbation | Assessing cellular stress responses |
| Co-immunoprecipitation | Protein-protein interactions | Mapping PCM interaction network |
| Electron microscopy | Ultrastructure of PCM fibers | Visualizing PCM at high resolution |
Super-Resolution Microscopy
Super-resolution microscopy techniques such as STORM and PALM have revealed the subdiffraction architecture of the PCM, showing distinct subdomains and protein localization patterns. These methods are essential for studying PCM structure at the nanoscale.
Proteomics
Mass spectrometry-based proteomics can identify PCM components and their post-translational modifications, providing insights into assembly and regulation. Proximity labeling approaches like BioID can map the PCM interactome in living cells.
Live-Cell Imaging
Fluorescent tagging of PCM proteins (e.g., GFP-PCNT) allows real-time visualization of PCM dynamics during the cell cycle. This method is used to track assembly, disassembly, and microtubule nucleation events.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes required for PCM assembly and function, as well as synthetic lethal interactions with PCM mutations. These screens are powerful for discovering new regulators and therapeutic targets.
How CRISPR Can Be Used to Study GO:0000242 pericentriolar material
Knockout
CRISPR knockout of PCM genes such as CDK5RAP2 or PCNT is used to study their essential roles in PCM assembly and microtubule nucleation. Knockout cell lines often exhibit mitotic defects, providing insights into gene function and disease mechanisms.
Point Mutation
Introducing disease-associated point mutations (e.g., in PCNT or CDK5RAP2) via CRISPR knock-in allows researchers to model microcephaly and study the molecular consequences of specific mutations. This approach is valuable for understanding genotype-phenotype relationships.
Knock-in
Tagged knock-in of PCM proteins (e.g., GFP or HaloTag) enables live-cell imaging and proteomic analysis of PCM dynamics and interactions. This method is used to track protein localization and turnover in real time.
Overexpression
CRISPR-mediated overexpression of PCM genes such as PLK1 or AURKA is used to model PCM amplification in cancer and study its effects on centrosome function and genomic stability. Overexpression models help identify therapeutic vulnerabilities.
How EDITGENE Supports pericentriolar material Research
Researchers studying pericentriolar material-related genes often need to determine whether a candidate gene is causally involved in PCM assembly, microtubule nucleation, or disease pathogenesis. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from knockout and point mutation models to overexpression and library screening.
Contact EDITGENE today to design your custom CRISPR model for pericentriolar material research.
Frequently Asked Questions About pericentriolar material
What is the pericentriolar material (PCM)?
The pericentriolar material (PCM) is a network of small fibers that surrounds the centrioles in cells and contains the microtubule nucleating activity of the centrosome.
What genes are involved in pericentriolar material?
Key genes include CDK5RAP2, CEP192, PCNT, TUBG1, PLK1, and AURKA, among others.
What is the function of GO:0000242?
GO:0000242 describes the pericentriolar material, which functions as the primary site for microtubule nucleation and anchoring in the centrosome.
How is the pericentriolar material assembled?
PCM assembly involves the recruitment of scaffold proteins like CDK5RAP2 and CEP192, which form a matrix that expands during mitosis and can self-assemble in interphase.
What diseases are associated with pericentriolar material dysfunction?
PCM dysfunction is linked to cancer, microcephaly, Seckel syndrome, and premature aging.
How can CRISPR be used to study pericentriolar material?
CRISPR knockout, point mutation knock-in, and overexpression models allow researchers to dissect PCM gene function and model related diseases.
What is the structure of the pericentriolar material?
Super-resolution microscopy has revealed that the PCM has a structured, layered architecture with distinct protein subdomains, rather than being amorphous.
Can the pericentriolar material form without centrioles?
Yes, studies have shown that PCM can self-assemble in interphase cells even in the absence of centrioles.
What is the role of pericentrin in the PCM?
Pericentrin is a major PCM component that anchors gamma-tubulin ring complexes and helps organize the PCM lattice.
How is the pericentriolar material regulated?
PCM assembly is regulated by cell cycle kinases such as PLK1 and Aurora A, which phosphorylate PCM components.
Conclusion
The pericentriolar material (GO:0000242) is a dynamic and structured network essential for microtubule nucleation and centrosome function. Its assembly and regulation are critical for cell division, and its dysfunction is implicated in cancer, neurodevelopmental disorders, and aging. Advances in super-resolution microscopy and CRISPR-based models continue to unravel the complexities of PCM biology, offering new avenues for therapeutic intervention. EDITGENE's comprehensive CRISPR services support researchers in exploring PCM gene function and disease mechanisms.
References
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