GO:0005876 spindle microtubule: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005876 spindle microtubule is a cellular component ontology term describing any microtubule that is part of a mitotic or meiotic spindle and anchored at one spindle pole.
• Spindle microtubules are dynamic polymers of alpha/beta-tubulin that self-organize into bipolar arrays to segregate chromosomes during cell division.
• Microtubule length correlates with spindle length in C. elegans meiosis, linking polymer dynamics to spindle scale.
• In human oocytes, spindle pole organization depends on a liquid-like spindle domain that promotes acentrosomal spindle assembly.
• Redundant microtubule crosslinkers prevent meiotic spindle bending to ensure diploid offspring in C. elegans.
• TACC3-ch-TOG interaction regulates spindle microtubule assembly by controlling centrosomal recruitment of gamma-TuRC.
Description
The spindle microtubule (GO:0005876) is a fundamental cellular component defined as any microtubule that is part of a mitotic or meiotic spindle and anchored at one spindle pole. This term captures the structural and functional unit of the spindle apparatus, the microtubule-based machine that segregates chromosomes during cell division. Spindle microtubules are not a static scaffold; they are highly dynamic polymers whose length, number, and organization are tightly regulated to ensure accurate chromosome segregation. Understanding spindle microtubules is therefore central to cell biology, developmental biology, and cancer research. Defects in spindle microtubule assembly or organization lead to chromosome missegregation, aneuploidy, and meiotic errors such as those observed in human oocytes. Because spindle microtubules are anchored at spindle poles, their study intersects with centrosome biology, acentrosomal spindle assembly, and the mechanics of force generation. Researchers use this GO term to annotate gene products that localize to or function within the spindle microtubule array, enabling systematic analysis of spindle biology across model organisms and human cells.
spindle microtubule At A Glance
| GO ID | GO:0005876 |
|---|---|
| GO term | spindle microtubule |
| Ontology | cellular_component |
| Synonym | none |
| Definition | Any microtubule that is part of a mitotic or meiotic spindle; anchored at one spindle pole. |
| Major function | Forms the structural and dynamic framework for chromosome segregation during mitosis and meiosis. |
| Related structures | Spindle poles, kinetochores, centrosomes, and the spindle midzone. |
| Key polymers | Alpha/beta-tubulin heterodimers assembled into polarized microtubules. |
| Model systems | C. elegans meiosis, human oocytes, marine embryos, and cultured mammalian cells. |
What Is GO:0005876?
According to the Gene Ontology, GO:0005876 spindle microtubule refers to any microtubule that is part of a mitotic or meiotic spindle and is anchored at one spindle pole. In practical terms, this includes the kinetochore microtubules that attach to chromosomes, the interpolar microtubules that overlap in the spindle midzone, and the astral microtubules that emanate from the poles. The term is a cellular component annotation, meaning it describes where a gene product acts rather than what it does. Spindle microtubules are built from alpha/beta-tubulin heterodimers and are organized by microtubule-organizing centers, including centrosomes and acentrosomal pathways in oocytes. Their dynamic instability allows rapid assembly and disassembly, which is essential for spindle assembly, chromosome alignment, and anaphase segregation.
Why Is spindle microtubule Important in Cell Biology?
Spindle microtubules are essential for faithful chromosome segregation, and their dysfunction is directly linked to aneuploidy, infertility, and cancer. The dynamic properties of spindle microtubules determine spindle length and shape, which in turn influence the fidelity of chromosome segregation. In human oocytes, spindle pole organization and instability are major contributors to meiotic errors, and understanding the underlying microtubule behavior is critical for reproductive biology. Because many chemotherapeutic agents target microtubule dynamics, spindle microtubules are also a central focus in cancer pharmacology. Moreover, the self-organization principles of spindle microtubules inform synthetic biology and soft matter physics. Studying this GO term helps researchers connect molecular mechanisms to cellular outcomes and disease phenotypes.
• Spindle microtubules are the core structural elements that segregate chromosomes during mitosis and meiosis.
• Microtubule length correlates with spindle length, linking polymer dynamics to spindle scale.
• Acentrosomal spindle assembly in mammalian oocytes relies on a liquid-like spindle domain that organizes microtubules.
• Spindle pole organization and instability in human oocytes are major causes of meiotic errors.
• Redundant microtubule crosslinkers prevent meiotic spindle bending, ensuring diploid offspring.
• TACC3-ch-TOG interaction regulates spindle microtubule assembly via centrosomal gamma-TuRC recruitment.
• Microtubule end-clustering maintains a steady-state spindle shape.
• Spindle microtubule dynamics are conserved across marine embryos and non-model organisms.
• Defects in spindle microtubules contribute to aneuploidy and cancer.
• Spindle microtubules are targets of anti-mitotic drugs used in chemotherapy.
What Happens During spindle microtubule?
Nucleation and assembly
In simple terms: Spindle microtubules start to form when tubulin subunits are nucleated at spindle poles.
Spindle microtubule assembly begins with nucleation of alpha/beta-tubulin heterodimers, often facilitated by the gamma-tubulin ring complex (gamma-TuRC) at centrosomes. TACC3-ch-TOG interaction regulates spindle microtubule assembly by controlling centrosomal recruitment of gamma-TuRC. In acentrosomal systems such as mammalian oocytes, a liquid-like spindle domain promotes spindle assembly by concentrating tubulin and regulatory factors. Self-organization of spindle-like microtubule structures can occur in vitro, demonstrating the intrinsic capacity of microtubules to form bipolar arrays.
Dynamic instability and length regulation
In simple terms: Spindle microtubules grow and shrink rapidly, and their length is tuned to spindle size.
Spindle microtubules exhibit dynamic instability, switching between growth and shrinkage. Microtubule length correlates with spindle length in C. elegans meiosis, suggesting that polymer length is actively regulated to match spindle dimensions. Microtubule end-clustering maintains a steady-state spindle shape, highlighting the importance of end-binding proteins in length control. Measuring mitotic spindle and microtubule dynamics in marine embryos and non-model organisms provides quantitative parameters for these processes.
Spindle pole organization and anchoring
In simple terms: Spindle microtubules are anchored at spindle poles, which organize the bipolar array.
Spindle microtubules are anchored at one spindle pole, and pole organization is critical for bipolar spindle formation. In human oocytes, spindle pole organization and instability are key determinants of meiotic fidelity. Acentrosomal spindle assembly in mammalian oocytes depends on a liquid-like spindle domain that promotes pole organization. Redundant microtubule crosslinkers prevent meiotic spindle bending, ensuring proper pole separation and diploid offspring in C. elegans.
Chromosome segregation and force generation
In simple terms: Spindle microtubules pull chromosomes apart during cell division.
During anaphase, spindle microtubules shorten and slide to segregate chromosomes. Microtubule end-clustering maintains a steady-state spindle shape, which is essential for coordinated force generation. The dynamic properties of spindle microtubules, including their length and crosslinking, ensure accurate chromosome segregation. Defects in these processes lead to chromosome missegregation and aneuploidy.
Key Genes Involved in GO:0005876 spindle microtubule
The following genes and proteins are experimentally validated components or regulators of spindle microtubules (GO:0005876) based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TUBB | Beta-tubulin subunit of microtubules | Core structural component; mutations affect spindle microtubule dynamics. |
| TUBA1A | Alpha-tubulin subunit of microtubules | Core structural component; mutations linked to neurodevelopmental disorders. |
| TACC3 | Regulates spindle microtubule assembly via gamma-TuRC recruitment | Key regulator of centrosomal microtubule nucleation. |
| ch-TOG | Microtubule polymerase; interacts with TACC3 | Controls spindle microtubule assembly and centrosomal gamma-TuRC recruitment. |
| gamma-TuRC components | Nucleate microtubules at centrosomes | Essential for spindle microtubule nucleation. |
| KIF11 (Eg5) | Kinesin motor; crosslinks and slides antiparallel microtubules | Required for bipolar spindle assembly. |
| KIF2A | Kinesin motor; depolymerizes microtubules | Regulates spindle microtubule length and pole focusing. |
| TPX2 | Microtubule nucleation and bundling factor | Promotes spindle assembly and microtubule crosslinking. |
| NuMA | Spindle pole organizer | Maintains spindle pole integrity and microtubule clustering. |
| Dynein | Minus-end-directed motor | Anchors and focuses spindle microtubules at poles. |
| CLASP | Microtubule plus-end tracking protein | Regulates microtubule dynamics and spindle length. |
| EB1 (MAPRE1) | Plus-end tracking protein | Tracks growing microtubule ends; regulates spindle positioning. |
| PRC1 | Microtubule crosslinker | Crosslinks antiparallel microtubules in the spindle midzone. |
| KIF4A | Kinesin motor; regulates midzone microtubules | Required for spindle midzone organization. |
| Aurora A | Kinase; regulates centrosome maturation and spindle assembly | Phosphorylates spindle assembly factors. |
| PLK1 | Kinase; regulates spindle assembly and microtubule dynamics | Controls TACC3 and other spindle proteins. |
| MAD1/MAD2 | Spindle assembly checkpoint proteins | Monitor microtubule-kinetochore attachment. |
| BUB1/BUBR1 | Spindle assembly checkpoint kinases | Ensure accurate chromosome segregation. |
How Is spindle microtubule Regulated?
Spindle microtubule dynamics and organization are regulated by a network of kinases, phosphatases, and microtubule-associated proteins. Aurora A and PLK1 kinases control centrosome maturation and spindle assembly by phosphorylating downstream effectors. TACC3-ch-TOG interaction is regulated by Aurora A phosphorylation, which controls centrosomal recruitment of gamma-TuRC and spindle microtubule assembly. In human oocytes, spindle pole organization and instability are influenced by the liquid-like spindle domain, which concentrates regulatory factors. Redundant microtubule crosslinkers, such as PRC1 and KIF4A, prevent meiotic spindle bending and ensure proper force balance. Microtubule end-clustering proteins maintain steady-state spindle shape by regulating plus-end dynamics. Additionally, the spindle assembly checkpoint monitors microtubule-kinetochore attachments to delay anaphase until all chromosomes are properly aligned.
spindle microtubule and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TACC3 | Cancer; spindle assembly defects | Knockout or point-mutation in cancer cell lines; xenograft models. |
| ch-TOG | Cancer; microtubule nucleation defects | Knockout or overexpression in HeLa cells; live imaging. |
| TUBB | Neurodevelopmental disorders; tubulinopathies | Knock-in of patient mutations in iPSC-derived neurons. |
| TUBA1A | Lissencephaly; microcephaly | Knockout or knock-in in mouse models. |
| PRC1 | Meiotic spindle bending; aneuploidy | Knockout in C. elegans; live imaging. |
Spindle microtubules and cancer
Aneuploidy and chromosomal instability are hallmarks of cancer, and defects in spindle microtubule dynamics contribute to these phenotypes. Many anti-mitotic chemotherapeutics, such as taxanes and vinca alkaloids, target spindle microtubules to arrest cell division. TACC3 and ch-TOG, which regulate spindle microtubule assembly, are overexpressed in various cancers and are being explored as therapeutic targets. Understanding spindle microtubule regulation in cancer cells can reveal mechanisms of drug resistance and identify new targets.
Spindle microtubules and reproductive disorders
In human oocytes, spindle pole organization and instability are major causes of meiotic errors, leading to infertility, miscarriage, and aneuploidy syndromes such as Down syndrome. Acentrosomal spindle assembly in oocytes relies on a liquid-like spindle domain, and its disruption leads to spindle defects. Redundant microtubule crosslinkers prevent meiotic spindle bending, and their loss results in aneuploid offspring in C. elegans. These findings highlight the importance of spindle microtubule integrity for reproductive health.
Spindle microtubules and neurodevelopmental disorders
Mutations in tubulin genes (TUBA1A, TUBB) that affect microtubule dynamics cause a range of neurodevelopmental disorders, including lissencephaly and microcephaly. Because spindle microtubules are essential for neural progenitor cell division, defects in their assembly or regulation can lead to impaired brain development. Studying spindle microtubule components in model organisms and human cells helps elucidate these disease mechanisms.
From spindle microtubule-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate spindle microtubule assembly? | Knockout cell lines (e.g., HeLa, RPE1) with live-cell imaging of tubulin. |
| Does a point mutation in gene X affect spindle microtubule dynamics? | Point-mutation knock-in cell lines; measure microtubule lifetime and spindle length. |
| Does gene X localize to spindle microtubules? | Tagged knock-in (e.g., GFP) in cell lines; confocal microscopy. |
| Does overexpression of gene X cause spindle defects? | Overexpression cell lines; quantify spindle morphology and chromosome alignment. |
| Does gene X interact with TACC3/ch-TOG? | Co-immunoprecipitation and proximity ligation in knockout/knock-in backgrounds. |
| Does gene X affect meiotic spindle assembly? | C. elegans or mouse oocyte models; live imaging. |
How to Study the spindle microtubule Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging with GFP-tubulin | Microtubule dynamics and spindle morphology | Real-time analysis of spindle assembly in cultured cells. |
| Fluorescence recovery after photobleaching (FRAP) | Microtubule turnover rates | Measuring spindle microtubule stability. |
| Electron microscopy | Ultrastructure of spindle microtubules | High-resolution imaging of microtubule arrays. |
| Co-immunoprecipitation | Protein-protein interactions | Identifying spindle microtubule-associated proteins. |
| RNA interference / CRISPR knockout | Gene function in spindle assembly | Loss-of-function studies in cell lines and C. elegans. |
| Quantitative image analysis | Spindle length and microtubule length | Correlating microtubule length with spindle length. |
| In vitro reconstitution | Self-organization of microtubules | Studying minimal spindle-like structures. |
| Spindle assembly checkpoint assays | Chromosome segregation fidelity | Assessing aneuploidy and mitotic arrest. |
Live-cell imaging of spindle microtubules
Live-cell imaging using fluorescently labeled tubulin (e.g., GFP-tubulin) allows real-time visualization of spindle microtubule dynamics. This method measures microtubule growth rates, shrinkage rates, and spindle length. It is applicable to cultured cells, C. elegans embryos, and marine embryos. Quantitative analysis of microtubule length and spindle length can reveal correlations.
Measuring microtubule dynamics in non-model organisms
Measuring mitotic spindle and microtubule dynamics in marine embryos and non-model organisms requires specialized protocols for sample preparation and imaging. These methods provide insights into conserved and divergent mechanisms of spindle assembly. They are particularly useful for studying acentrosomal spindle assembly in oocytes.
Genetic perturbation and phenotypic analysis
Knockout, knockdown, or overexpression of spindle microtubule regulators followed by phenotypic analysis (e.g., chromosome segregation errors, spindle morphology) identifies gene function. For example, knockout of redundant microtubule crosslinkers in C. elegans causes meiotic spindle bending. TACC3 depletion impairs centrosomal gamma-TuRC recruitment and spindle microtubule assembly.
Biochemical and proteomic approaches
Co-immunoprecipitation, mass spectrometry, and proximity labeling can identify interacting partners of spindle microtubule proteins. These methods help build the molecular interaction network of spindle microtubules. For instance, the TACC3-ch-TOG interaction was defined biochemically and validated by functional assays.
How CRISPR Can Be Used to Study GO:0005876 spindle microtubule
Knockout
CRISPR knockout of genes encoding spindle microtubule components or regulators (e.g., TACC3, ch-TOG, PRC1) allows researchers to assess loss-of-function phenotypes. For example, TACC3 knockout impairs spindle microtubule assembly and centrosomal gamma-TuRC recruitment. Knockout of redundant crosslinkers in C. elegans causes meiotic spindle bending. Knockout cell lines are valuable for studying spindle assembly and chromosome segregation.
Point Mutation
CRISPR point mutation (base editing or homology-directed repair) can introduce disease-associated or phospho-null/phospho-mimetic mutations into spindle microtubule genes. This approach helps dissect the functional significance of specific residues, such as those in TACC3 that mediate Aurora A phosphorylation. Point-mutation models are useful for studying tubulinopathies and cancer-associated mutations.
Knock-in
CRISPR knock-in of fluorescent tags (e.g., GFP, mCherry) or epitope tags into endogenous spindle microtubule genes enables live-cell imaging and biochemical purification. Tagged knock-in of tubulin or TACC3 allows visualization of spindle microtubule dynamics at endogenous expression levels. This approach is ideal for studying protein localization and dynamics.
Overexpression
CRISPR-mediated overexpression (e.g., via safe-harbor integration) of spindle microtubule regulators can reveal gain-of-function phenotypes. Overexpression of TACC3 or ch-TOG may disrupt spindle microtubule assembly and cause chromosome missegregation. Overexpression models are useful for studying oncogenic roles of spindle proteins.
How EDITGENE Supports spindle microtubule Research
Researchers studying spindle microtubule-related genes often need to determine whether a candidate gene is causally involved in spindle assembly, chromosome segregation, or disease. EDITGENE provides a comprehensive suite of CRISPR services to create precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for spindle microtubule research.
Frequently Asked Questions About spindle microtubule
What is GO:0005876 spindle microtubule?
GO:0005876 is a Gene Ontology cellular component term defined as any microtubule that is part of a mitotic or meiotic spindle and anchored at one spindle pole.
What genes are involved in spindle microtubule assembly?
Key genes include TUBB, TUBA1A, TACC3, ch-TOG, gamma-TuRC components, KIF11, TPX2, NuMA, and PRC1, among others.
How do spindle microtubules form?
Spindle microtubules form by nucleation of alpha/beta-tubulin heterodimers, often facilitated by gamma-TuRC at centrosomes, and self-organize into bipolar arrays.
What is the function of spindle microtubules?
Spindle microtubules segregate chromosomes during mitosis and meiosis by attaching to kinetochores and generating forces that pull sister chromatids apart.
How are spindle microtubules regulated?
They are regulated by kinases such as Aurora A and PLK1, microtubule-associated proteins, and crosslinkers like PRC1 and KIF4A.
What diseases are associated with spindle microtubule defects?
Spindle microtubule defects are linked to cancer, infertility, meiotic errors, and neurodevelopmental disorders such as lissencephaly.
How can I study spindle microtubules in the lab?
Common methods include live-cell imaging with GFP-tubulin, FRAP, co-immunoprecipitation, and CRISPR knockout or knock-in models.
What is the role of TACC3 in spindle microtubules?
TACC3 interacts with ch-TOG to regulate spindle microtubule assembly by controlling centrosomal recruitment of gamma-TuRC.
Why is spindle microtubule length important?
Microtubule length correlates with spindle length, which is critical for proper chromosome segregation and spindle scaling.
Can CRISPR be used to study spindle microtubules?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect spindle microtubule gene function.
Conclusion
Spindle microtubules (GO:0005876) are dynamic, essential structures that drive chromosome segregation in mitosis and meiosis. Their assembly, length regulation, and organization are controlled by a complex network of tubulin subunits, motors, crosslinkers, and kinases. Defects in spindle microtubules cause aneuploidy, infertility, and cancer, making them important targets for basic and translational research. Advances in live-cell imaging, CRISPR genome editing, and quantitative analysis continue to reveal how spindle microtubules self-organize and function. EDITGENE provides comprehensive CRISPR services to support researchers in building precise cell models for spindle microtubule studies.
References
- 1. Zimyanin V et al.. 2024. Microtubule length correlates with spindle length in C. elegans meiosis.. Cytoskeleton (Hoboken) 81(8):356-368 PMID: 38450962
- 2. So C et al.. 2022. Mechanism of spindle pole organization and instability in human oocytes.. Science 375(6581):eabj3944 PMID: 35143306
- 3. So C et al.. 2019. A liquid-like spindle domain promotes acentrosomal spindle assembly in mammalian oocytes.. Science 364(6447) PMID: 31249032
- 4. Edozie B et al.. 2019. Self-organization of spindle-like microtubule structures.. Soft Matter 15(24):4797-4807 PMID: 31123741
- 5. Chenevert J et al.. 2024. Measuring Mitotic Spindle and Microtubule Dynamics in Marine Embryos and Non-model Organisms.. Methods Mol Biol 2740:187-210 PMID: 38393477
- 6. Hueschen CL et al.. 2019. Microtubule End-Clustering Maintains a Steady-State Spindle Shape.. Curr Biol 29(4):700-708.e5 PMID: 30744975
- 7. Li W et al.. 2023. Redundant microtubule crosslinkers prevent meiotic spindle bending to ensure diploid offspring in C. elegans.. PLoS Genet 19(12):e1011090 PMID: 38150489
- 8. Rajeev R et al.. 2023. TACC3-ch-TOG interaction regulates spindle microtubule assembly by controlling centrosomal recruitment of γ-TuRC.. Biosci Rep 43(3) PMID: 36790370
