GO:1990498 mitotic spindle microtubule: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1990498 (mitotic spindle microtubule) defines any microtubule that is part of a mitotic spindle and anchored at one spindle pole.
• These microtubules are dynamic polymers that drive chromosome segregation and spindle positioning during mitosis.
• Key regulators include KIF15, dynein, and SH2D4A, which control microtubule bundling, sliding, and nucleation.
• Dysregulation of mitotic spindle microtubules is linked to chromosomal instability and cancer.
• Advanced imaging and quantitative methods are essential to measure microtubule dynamics in diverse model systems.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal testing of spindle microtubule genes.
Description
The mitotic spindle is a complex molecular machine that segregates chromosomes during cell division. At its core are microtubules, dynamic polymers of tubulin that form the spindle apparatus. GO:1990498, mitotic spindle microtubule, refers specifically to any microtubule that is part of a mitotic spindle and anchored at one spindle pole. These microtubules are essential for chromosome capture, alignment, and segregation, and their dynamics are tightly regulated in space and time. Understanding the components, assembly, and regulation of mitotic spindle microtubules is fundamental to cell biology and has direct implications for cancer and developmental disorders. Researchers study these structures using advanced imaging, genetic perturbation, and quantitative modeling across model organisms.
mitotic spindle microtubule At A Glance
| GO ID | GO:1990498 |
|---|---|
| GO term | mitotic spindle microtubule |
| Ontology | cellular_component |
| Synonym | none |
| Major function | Chromosome segregation and spindle positioning during mitosis |
| Location | Mitotic spindle, anchored at spindle poles |
| Key components | Tubulin, KIF15, dynein, SH2D4A, and associated MAPs |
| Related processes | Mitotic spindle assembly, chromosome segregation, cytokinesis |
What Is GO:1990498?
GO:1990498 (mitotic spindle microtubule) is a cellular component term describing any microtubule that is part of a mitotic spindle and anchored at one spindle pole. This includes kinetochore microtubules, interpolar microtubules, and astral microtubules, all of which contribute to spindle architecture and function.
Why Is mitotic spindle microtubule Important in Cell Biology?
Mitotic spindle microtubules are central to faithful chromosome segregation, and their dysfunction leads to aneuploidy, a hallmark of cancer and developmental disorders. They are also targets of chemotherapeutic drugs like taxanes and vinca alkaloids, making them a focal point for cancer research. Moreover, understanding their assembly and dynamics informs basic mechanisms of cell division and provides insights into tissue homeostasis and regeneration.
• Essential for accurate chromosome segregation during mitosis.
• Dysregulation causes chromosomal instability and aneuploidy, driving tumorigenesis.
• Target of anti-mitotic drugs used in cancer therapy.
• Required for spindle positioning and asymmetric cell division.
• Involved in mitotic spindle assembly and maintenance.
• Regulated by motor proteins like dynein and KIF15.
• Nucleation and organization differ between plant and animal cells.
• Quantitative imaging reveals dynamic instability parameters.
• Membrane interactions influence spindle function.
• CRISPR screens identify novel regulators of spindle microtubules.
What Happens During mitotic spindle microtubule?
Microtubule nucleation and spindle assembly
In simple terms: New microtubules are born and organized into a spindle shape.
In animal cells, microtubule nucleation occurs at centrosomes, which duplicate and mature before mitosis. SH2D4A promotes centrosome maturation to support spindle microtubule formation. In vascular plant cells, nucleation occurs at the nuclear envelope and other sites, establishing the mitotic spindle. Antiparallel microtubule bundling by KIF15 supports spindle assembly.
Chromosome capture and alignment
In simple terms: Microtubules grab chromosomes and line them up in the middle.
Kinetochore microtubules attach to chromosomes and align them at the metaphase plate. This process requires dynamic instability and motor proteins like dynein, which slides microtubules and positions the spindle. The precision of spindle positioning depends on microtubule pushing forces.
Chromosome segregation and spindle elongation
In simple terms: Microtubules pull chromosomes apart and push the spindle poles apart.
During anaphase, kinetochore microtubules shorten to pull sister chromatids to opposite poles, while interpolar microtubules slide apart to elongate the spindle. Dynein and KIF15 are key motors in these events. Regulation of microtubule dynamics is critical for timely segregation.
Spindle disassembly and cytokinesis
In simple terms: The spindle breaks down after chromosomes are separated.
After chromosome segregation, the spindle disassembles, and a contractile ring forms to divide the cell. Microtubule dynamics are downregulated, and spindle components are recycled. Membrane remodeling also contributes to spindle function and disassembly.
Key Genes Involved in GO:1990498 mitotic spindle microtubule
The following genes and proteins are key players in the structure, regulation, and function of mitotic spindle microtubules.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TUBA1A | Alpha-tubulin, core microtubule subunit | Mutations cause tubulinopathies and mitotic defects |
| TUBB | Beta-tubulin, core microtubule subunit | Target of anti-mitotic drugs; mutations in cancer |
| KIF15 | Motor protein, antiparallel microtubule bundling | Essential for spindle assembly and maintenance |
| DYNC1H1 | Dynein heavy chain, microtubule sliding | Mutations linked to neurodevelopmental disorders |
| SH2D4A | Centrosome maturation and spindle formation | Regulates mitotic progression |
| PLK1 | Mitotic kinase, regulates spindle assembly | Overexpressed in cancers; drug target |
| AURKA | Centrosome maturation and spindle assembly | Amplified in cancers; target of inhibitors |
| TPX2 | Spindle assembly factor, activates AURKA | Required for spindle integrity |
| NUMA1 | Spindle positioning and organization | Regulates dynein at spindle poles |
| CLASP1 | Microtubule plus-end tracking protein | Regulates kinetochore microtubule dynamics |
| EB1 (MAPRE1) | Plus-end tracking protein | Controls microtubule dynamics and spindle orientation |
| MCAK (KIF2C) | Kinesin-13, depolymerizes microtubules | Regulates error correction in kinetochore attachment |
| CENPA | Centromeric histone H3 variant | Required for kinetochore assembly |
| NDC80 | Kinetochore component | Links chromosomes to microtubules |
| BUB1 | Spindle assembly checkpoint kinase | Ensures accurate chromosome segregation |
| MAD2L1 | Spindle assembly checkpoint protein | Prevents anaphase until all chromosomes are attached |
| TP53 | Tumor suppressor, monitors spindle integrity | Mutations allow proliferation with spindle defects |
How Is mitotic spindle microtubule Regulated?
Mitotic spindle microtubule dynamics are regulated by a network of kinases and phosphatases, including PLK1, AURKA, and CDK1, which phosphorylate microtubule-associated proteins and motors. The spindle assembly checkpoint (SAC) monitors kinetochore-microtubule attachments and delays anaphase until all chromosomes are properly attached. Motor proteins such as dynein and KIF15 generate forces that organize and position the spindle. Additionally, membrane-associated factors contribute to spindle regulation.
mitotic spindle microtubule and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TUBA1A | Tubulinopathy, lissencephaly | Knock-in mouse or human iPSC-derived neurons |
| DYNC1H1 | Neurodevelopmental disorder | Point mutation knock-in in mice |
| SH2D4A | Cancer, chromosomal instability | Knockout in cancer cell lines |
| AURKA | Cancer, mitotic defects | Overexpression in cell lines |
| TP53 | Cancer, spindle checkpoint defects | Knockout in organoids |
Cancer and chromosomal instability
Dysregulation of mitotic spindle microtubules leads to chromosomal instability (CIN), a hallmark of many cancers. Overexpression of spindle assembly factors like SH2D4A or AURKA can promote tumorigenesis by causing aneuploidy. Anti-mitotic drugs targeting microtubules are used in chemotherapy, but resistance often arises.
Neurodevelopmental disorders
Mutations in tubulin genes (e.g., TUBA1A, TUBB) and dynein (DYNC1H1) cause neurodevelopmental disorders such as lissencephaly and microcephaly, highlighting the importance of spindle microtubules in neural progenitor division.
Plant development and agriculture
In plants, mitotic spindle microtubules are essential for growth and development. Studies in vascular plants reveal unique nucleation mechanisms that could be targeted for crop improvement.
From mitotic spindle microtubule-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate spindle microtubule dynamics? | Knockout cell line (e.g., HeLa, RPE1) |
| Does a specific mutation in tubulin affect spindle function? | Point mutation knock-in via CRISPR |
| Where does protein X localize during mitosis? | Tagged knock-in (e.g., GFP) in cell lines |
| Does overexpression of gene Y cause aneuploidy? | Overexpression cell line |
| What are the interactors of spindle protein Z? | BioID or APEX2 knock-in |
| Can we identify novel regulators of spindle microtubules? | CRISPR library screening |
How to Study the mitotic spindle microtubule Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Microtubule dynamics, spindle assembly | Quantifying dynamic instability in real time |
| CRISPR knockout | Gene function loss | Identifying essential spindle regulators |
| CRISPR knock-in | Protein localization and dynamics | Tagging endogenous proteins with fluorophores |
| Overexpression | Gain-of-function effects | Testing oncogenic potential of spindle genes |
| RNA-seq | Transcriptional changes | Assessing gene expression after spindle perturbation |
| Proteomics | Protein interactions and abundance | Identifying spindle-associated complexes |
| CRISPR library screening | Genome-wide fitness | Discovering novel mitotic regulators |
Live-cell imaging and quantitative analysis
Live-cell imaging of fluorescently labeled tubulin allows measurement of microtubule dynamics, spindle assembly, and chromosome segregation in real time. Advanced microscopy techniques such as spinning-disk confocal or lattice light-sheet microscopy provide high spatiotemporal resolution.
Genetic perturbation and CRISPR screens
CRISPR knockout, point mutation, and overexpression models enable causal testing of gene function in spindle microtubule regulation. Genome-wide CRISPR screens can identify novel genes required for mitotic spindle assembly and chromosome segregation.
Biochemical and proteomic approaches
Proteomics and interactomics (e.g., BioID, APEX) can identify protein complexes associated with spindle microtubules. These methods complement imaging and genetic approaches to build a comprehensive understanding of spindle function.
Model organisms and comparative studies
Studies in marine embryos, plants, and other non-model organisms reveal conserved and divergent mechanisms of spindle microtubule assembly and dynamics. These comparative approaches provide evolutionary insights and potential agricultural applications.
How CRISPR Can Be Used to Study GO:1990498 mitotic spindle microtubule
Knockout
CRISPR knockout of genes encoding spindle microtubule components (e.g., KIF15, SH2D4A) can reveal their essential roles in mitosis. For example, SH2D4A knockout impairs centrosome maturation and spindle formation.
Point Mutation
Introducing disease-associated point mutations (e.g., in TUBA1A or DYNC1H1) via CRISPR allows study of their effects on spindle microtubule dynamics and chromosome segregation.
Knock-in
Tagged knock-in of spindle proteins (e.g., GFP-tubulin) enables live-cell imaging of microtubule dynamics and spindle assembly. This approach preserves endogenous regulation.
Overexpression
Overexpression of spindle assembly factors (e.g., AURKA, PLK1) can induce aneuploidy and transformation, providing models for cancer research.
How EDITGENE Supports mitotic spindle microtubule Research
Researchers studying mitotic 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 generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for mitotic spindle microtubule research.
Frequently Asked Questions About mitotic spindle microtubule
What is GO:1990498?
GO:1990498 is a Gene Ontology term for mitotic spindle microtubule, defined as any microtubule that is part of a mitotic spindle and anchored at one spindle pole.
What genes are involved in mitotic spindle microtubules?
Key genes include TUBA1A, TUBB, KIF15, DYNC1H1, SH2D4A, PLK1, AURKA, and many others.
How are mitotic spindle microtubules regulated?
They are regulated by kinases (e.g., PLK1, AURKA), motor proteins (e.g., dynein, KIF15), and the spindle assembly checkpoint.
What diseases are associated with mitotic spindle microtubule defects?
Defects are linked to cancer, chromosomal instability, and neurodevelopmental disorders such as lissencephaly.
What methods are used to study mitotic spindle microtubules?
Live-cell imaging, CRISPR screens, proteomics, and biochemical assays are commonly used.
What is the role of KIF15 in the mitotic spindle?
KIF15 bundles antiparallel microtubules to support spindle assembly and maintenance.
How does SH2D4A affect spindle microtubules?
SH2D4A promotes centrosome maturation, which is required for spindle microtubule formation.
Can CRISPR be used to study mitotic spindle microtubules?
Yes, CRISPR knockout, knock-in, point mutation, and overexpression models are powerful tools for functional studies.
What is the spindle assembly checkpoint?
The spindle assembly checkpoint monitors kinetochore-microtubule attachments and delays anaphase until all chromosomes are properly attached.
Why are mitotic spindle microtubules important for cancer research?
They are targets of anti-mitotic drugs, and their dysregulation causes chromosomal instability, a hallmark of cancer.
Conclusion
GO:1990498 (mitotic spindle microtubule) represents a fundamental component of cell division, with critical roles in chromosome segregation and spindle positioning. Its regulation involves a complex interplay of motor proteins, kinases, and structural components, and its dysfunction is linked to cancer and developmental disorders. Advanced CRISPR models and imaging techniques continue to unravel the mechanisms of spindle microtubule function, offering new avenues for therapeutic intervention.
References
- 1. Vicente JJ et al.. 2019. The quantification and regulation of microtubule dynamics in the mitotic spindle.. Curr Opin Cell Biol 60:36-43 PMID: 31108428
- 2. Salazar BM et al.. 2024. Antiparallel microtubule bundling supports KIF15-driven mitotic spindle assembly.. Mol Biol Cell 35(6):ar84 PMID: 38598297
- 3. 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
- 4. Scholey JM. 2025. Mitotic spindle membranes.. Mol Biol Cell 36(4):re1 PMID: 40067152
- 5. Masoud K et al.. 2013. Microtubule nucleation and establishment of the mitotic spindle in vascular plant cells.. Plant J 75(2):245-57 PMID: 23521421
- 6. Yuki R et al.. 2023. SH2D4A promotes centrosome maturation to support spindle microtubule formation and mitotic progression.. Sci Rep 13(1):2067 PMID: 36739326
- 7. Yildiz A et al.. 2023. Dyneins.. Curr Biol 33(24):R1274-R1279 PMID: 38113834
- 8. Howard J et al.. 2017. Physical Limits on the Precision of Mitotic Spindle Positioning by Microtubule Pushing forces: Mechanics of mitotic spindle positioning.. Bioessays 39(11) PMID: 28960439
