GO:0090619 meiotic spindle pole: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090619 (meiotic spindle pole) is a cellular_component term describing either end of a meiotic spindle where microtubules are organized, typically containing a microtubule organizing center (MTOC) and accessory molecules.
• Meiotic spindle poles are built from acentriolar MTOCs in oocytes and from spindle pole bodies in yeast, and their focusing depends on motor proteins, microtubule crosslinkers and pericentriolar material.
• Key molecular players include Aurora A, XMAP215/ZYG-9, TACC/TAC-1, KIFC1, CFAP100 and pericentric major satellite transcripts, which together ensure pole coalescence, stability and chromosome segregation.
• Loss of spindle pole integrity causes chromosome missegregation, aneuploidy and meiotic arrest, linking GO:0090619 to infertility, developmental defects and cancer.
• CRISPR knockout, point mutation, knock-in and overexpression models are essential to dissect gene function at the meiotic spindle pole, complemented by live imaging, proteomics and transcriptomics.
• EDITGENE provides end-to-end CRISPR cell model and screening services to accelerate mechanistic and translational research on meiotic spindle pole genes.
Description
The meiotic spindle pole (GO:0090619) is a specialized cellular structure that defines the two ends of the meiotic spindle, the microtubule-based machine that segregates chromosomes during meiosis. Unlike mitotic spindle poles, meiotic poles often lack canonical centrioles in oocytes and instead assemble from acentriolar microtubule organizing centers (MTOCs) that recruit pericentriolar material and motor proteins to focus microtubule minus ends. This organization is critical for bipolar spindle assembly, chromosome congression and accurate reductional and equational divisions. Researchers study GO:0090619 because defects in pole assembly or stability directly cause aneuploidy, meiotic arrest and infertility, and because the underlying mechanisms illuminate general principles of acentrosomal spindle assembly. Recent work has identified diverse regulators, including Aurora A at acentriolar MTOCs, the XMAP215/TACC module, KIFC1, CFAP100 and pericentric satellite transcription, that act at multiple steps to promote pole coalescence and integrity. Understanding these components is essential for modeling meiotic errors in human disease and for developing reproductive and cancer-relevant interventions.
meiotic spindle pole At A Glance
| GO ID | GO:0090619 |
|---|---|
| GO term | meiotic spindle pole |
| Ontology | cellular_component |
| Synonym | None |
| Major function | Organization and focusing of spindle microtubules at the ends of the meiotic spindle; contains MTOC and accessory molecules |
| Cellular context | Meiosis I and meiosis II spindles in oocytes, spermatocytes and fungal meiosis |
| Key structural feature | Acentriolar MTOCs in oocytes; spindle pole bodies in yeast |
| Associated processes | Spindle pole coalescence, bipolar spindle assembly, chromosome segregation, cytokinesis |
What Is GO:0090619?
GO:0090619 (meiotic spindle pole) is defined as either of the ends of a meiotic spindle, a spindle that forms as part of meiosis, where spindle microtubules are organized; it usually contains a microtubule organizing center and accessory molecules, spindle microtubules and astral microtubules. In practice, this term captures the structural and functional pole region that nucleates, anchors and focuses microtubules during meiotic divisions, including acentriolar MTOCs in oocytes and spindle pole bodies in fungi.
Why Is meiotic spindle pole Important in Cell Biology?
The meiotic spindle pole is a focal point for understanding how cells build a bipolar division machinery without canonical centrosomes, and how errors in this process lead to aneuploidy and reproductive failure. Because meiotic spindle pole dysfunction is directly linked to chromosome missegregation, meiotic arrest and developmental abnormalities, it is a high-value target for research in infertility, aneuploidy syndromes and cancer biology.
• Defines the structural ends of the meiotic spindle where microtubules are nucleated and focused.
• Essential for bipolar spindle assembly and accurate chromosome segregation during meiosis.
• Acentriolar MTOC function at meiotic poles is a model for acentrosomal spindle assembly in human oocytes.
• Pole instability causes chromosome missegregation, aneuploidy and meiotic arrest.
• Pericentric major satellite transcription is required for meiotic chromosome stability and spindle pole organization.
• Motor proteins such as KIFC1 and crosslinkers such as XMAP215/TACC regulate pole coalescence and stability.
• CFAP100 couples microtubule glutamylation to spindle pole integrity in keratinocytes, linking pole biology to epidermal development.
• Spindle pole body dynamics in yeast provide a genetically tractable model for meiotic pole function.
• Aurora A at acentriolar MTOCs is critical for assembly of the liquid-like meiotic spindle domain.
• Meiotic spindle pole genes are candidate biomarkers and therapeutic targets in reproductive and proliferative disorders.
What Happens During meiotic spindle pole?
Initiation of meiotic spindle assembly
In simple terms: The cell starts building the meiotic spindle by gathering microtubule-organizing material at the future poles.
During early meiosis, acentriolar MTOCs accumulate and nucleate microtubules that will form the meiotic spindle. In oocytes, Aurora A at acentriolar MTOCs is required for assembly of the liquid-like meiotic spindle domain, and loss of these MTOCs disrupts spindle pole Aurora A and spindle assembly. In yeast, the spindle pole body is the primary microtubule organizing center that drives meiotic chromosome dynamics.
Pole coalescence and focusing
In simple terms: Scattered microtubule-organizing centers merge into two tight poles, giving the spindle a bipolar shape.
Spindle pole coalescence requires motor proteins and microtubule crosslinkers that cluster MTOCs into focused poles. In C. elegans oocytes, XMAP215/ZYG-9 and TACC/TAC-1 act at multiple times during oocyte meiotic spindle assembly and promote both spindle pole coalescence and stability. Context-dependent spindle pole focusing mechanisms further refine pole structure across cell types.
Bipolar spindle stabilization and chromosome capture
In simple terms: Once two poles form, they stabilize the spindle and capture chromosomes for segregation.
Stable bipolar poles are required for chromosome congression and segregation. Pericentric major satellite transcription is essential for meiotic chromosome stability and spindle pole organization, linking pericentromeric chromatin to pole function. In mouse spermatocytes, meiotic progression can occur without the spindle pole clustering motor protein KIFC1 or cytokinesis, forming single-cell late-stage spermatids, indicating redundancy in some pole functions.
Pole integrity and microtubule modifications
In simple terms: Chemical modifications of microtubules help keep the poles strong and functional.
CFAP100 couples microtubule glutamylation to spindle pole integrity in keratinocytes to promote epidermal development, showing that microtubule post-translational modifications contribute to pole stability. This suggests that meiotic spindle poles may similarly depend on microtubule modification enzymes for integrity.
Key Genes Involved in GO:0090619 meiotic spindle pole
The following genes and proteins have been experimentally implicated in meiotic spindle pole organization, focusing, stability or integrity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AURKA | Aurora A kinase at acentriolar MTOCs; required for liquid-like meiotic spindle domain assembly | Loss disrupts spindle pole Aurora A and spindle assembly in oocytes |
| XMAP215/ZYG-9 | Microtubule polymerase promoting spindle pole coalescence and stability | Acts at multiple times during oocyte meiotic spindle assembly |
| TACC/TAC-1 | Microtubule crosslinker and pole focusing factor | Promotes both spindle pole coalescence and stability |
| KIFC1 | Spindle pole clustering motor protein | Meiotic progression can occur without KIFC1 in mouse spermatocytes |
| CFAP100 | Couples microtubule glutamylation to spindle pole integrity | Promotes epidermal development via pole integrity in keratinocytes |
| Pericentric major satellite transcripts | Non-coding transcripts required for meiotic chromosome stability and spindle pole organization | Essential for meiotic chromosome stability and pole organization |
| Spindle pole body components (yeast) | Primary MTOC in fungal meiosis | Model for meiotic chromosome dynamics and pole function |
| Microtubule organizing center (MTOC) proteins | Nucleate and anchor microtubules at meiotic poles | Acentriolar MTOC loss disrupts spindle pole assembly |
| Pericentriolar material (PCM) proteins | Recruit microtubule nucleators and motors to poles | Context-dependent spindle pole focusing |
| Microtubule motors (dynein, kinesins) | Cluster MTOCs and focus spindle poles | Required for pole coalescence and stability |
| Microtubule crosslinkers | Bundle and stabilize microtubules at poles | Promote pole focusing and stability |
| Glutamylation enzymes | Modify microtubules to regulate pole integrity | CFAP100 links glutamylation to pole integrity |
| Chromosome segregation machinery | Ensures accurate chromosome distribution from bipolar poles | Pole defects cause missegregation and aneuploidy |
| Cytokinesis machinery | Coordinates pole function with cell division | Meiotic progression without cytokinesis forms single-cell spermatids |
| Aurora A regulators | Control Aurora A localization and activity at poles | Aurora A at MTOCs is critical for spindle domain assembly |
| Spindle assembly checkpoint proteins | Monitor pole attachment and chromosome bi-orientation | Pole instability triggers meiotic arrest |
| Microtubule severing enzymes | Regulate microtubule dynamics at poles | Contribute to pole focusing and stability |
| Pericentric heterochromatin factors | Maintain pericentric transcription and pole organization | Pericentric major satellite transcription is essential for pole organization |
How Is meiotic spindle pole Regulated?
Meiotic spindle pole organization is regulated by a combination of kinase signaling, motor protein activity and microtubule post-translational modifications. Aurora A at acentriolar MTOCs is required for assembly of the liquid-like meiotic spindle domain, and its loss disrupts spindle pole function. Motor proteins such as KIFC1 contribute to pole clustering, although meiotic progression can occur without KIFC1 in mouse spermatocytes, indicating context-dependent redundancy. Microtubule crosslinkers and polymerases, including XMAP215/ZYG-9 and TACC/TAC-1, act at multiple times to promote pole coalescence and stability. Pericentric major satellite transcription is also required for meiotic chromosome stability and spindle pole organization, linking chromatin state to pole regulation. Microtubule glutamylation, coupled by CFAP100, regulates spindle pole integrity in keratinocytes, suggesting similar modification-dependent regulation may operate in meiosis.
meiotic spindle pole and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AURKA | Oocyte meiotic spindle assembly defects; aneuploidy | Aurka knockout or point-mutation oocyte cell model |
| XMAP215/ZYG-9 | Spindle pole coalescence and stability defects; meiotic errors | ZYG-9 knockout or tagged knock-in in C. elegans oocytes |
| TACC/TAC-1 | Pole focusing defects; chromosome missegregation | TAC-1 knockout or overexpression in oocytes |
| KIFC1 | Spermatid formation defects; meiotic progression without pole clustering | Kifc1 knockout mouse spermatocyte model |
| CFAP100 | Epidermal development defects; spindle pole integrity | CFAP100 knockout or knock-in keratinocyte model |
Aneuploidy and reproductive failure
Defects in meiotic spindle pole organization cause chromosome missegregation and aneuploidy, which are major causes of miscarriage, infertility and developmental disorders. Loss of acentriolar MTOCs disrupts spindle pole Aurora A and spindle assembly in oocytes, directly linking pole dysfunction to meiotic errors. Pericentric major satellite transcription is essential for meiotic chromosome stability and spindle pole organization, and its disruption impairs chromosome segregation.
Cancer and proliferative disorders
Spindle pole abnormalities, including supernumerary or unstable poles, contribute to chromosomal instability in cancer. Although meiotic spindle pole components are primarily studied in meiosis, shared molecular machinery such as Aurora A and microtubule regulators also functions in mitotic cells, and their dysregulation is relevant to tumorigenesis. CFAP100-dependent spindle pole integrity in keratinocytes is linked to epidermal development, highlighting tissue-specific roles of pole regulators.
Developmental defects
Meiotic spindle pole dysfunction can lead to meiotic arrest and abnormal gamete formation, resulting in developmental defects. In mouse spermatocytes, meiotic progression without KIFC1 or cytokinesis forms single-cell late-stage spermatids, indicating that pole clustering defects can alter spermatid formation. CFAP100 couples microtubule glutamylation to spindle pole integrity to promote epidermal development, demonstrating that pole integrity is required for normal tissue development.
From meiotic spindle pole-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for meiotic spindle pole assembly? | CRISPR knockout in oocyte or spermatocyte cell lines |
| Does a specific point mutation in a pole gene cause pole instability? | CRISPR point-mutation knock-in in meiotic cells |
| How does a tagged pole protein localize during meiosis? | CRISPR knock-in of fluorescent or epitope tags |
| Does overexpression of a pole regulator disrupt bipolar spindle formation? | CRISPR overexpression or inducible expression models |
| Which genes are essential for pole coalescence in a genome-wide manner? | CRISPR library screening in meiotic cell models |
| How does pericentric transcription affect pole organization? | Knockout or knockdown of pericentric satellite transcription in oocytes |
How to Study the meiotic spindle pole Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell fluorescence imaging | Pole coalescence, focusing and stability dynamics | Tracking meiotic spindle pole assembly in oocytes |
| Proteomics | Protein composition of isolated spindle poles | Identifying MTOC and pole-associated proteins |
| RNA-seq | Transcript levels including pericentric satellite RNAs | Linking transcription to pole organization |
| CRISPR knockout | Gene requirement for pole assembly and stability | Functional testing of candidate pole genes |
| CRISPR point mutation | Effect of specific amino acid changes on pole function | Modeling disease-associated variants |
| CRISPR knock-in tagging | Localization and dynamics of tagged pole proteins | Visualizing endogenous pole proteins |
| CRISPR overexpression | Consequences of excess pole regulator | Testing dosage effects on bipolar spindle formation |
| CRISPR library screening | Genome-wide identification of pole regulators | Discovering novel meiotic spindle pole genes |
Live-cell imaging of meiotic spindle poles
Live imaging of fluorescently tagged MTOC and microtubule markers allows direct visualization of pole coalescence, focusing and stability during meiosis. This approach has been used to show that XMAP215/ZYG-9 and TACC/TAC-1 act at multiple times during oocyte meiotic spindle assembly to promote pole coalescence and stability, and that Aurora A at acentriolar MTOCs is required for assembly of the liquid-like meiotic spindle domain.
Proteomics of isolated spindle poles
Proteomic analysis of isolated meiotic spindle poles can identify pole-associated proteins, including motors, crosslinkers and MTOC components. Such studies help define the molecular composition of GO:0090619 and reveal context-dependent pole focusing factors.
Transcriptomics and satellite transcription analysis
RNA-seq and nascent transcript profiling can measure pericentric major satellite transcription, which is essential for meiotic chromosome stability and spindle pole organization. This method links chromatin transcription to pole function and can reveal regulatory non-coding RNAs at meiotic poles.
Genetic perturbation and functional assays
Knockout, knockdown and point-mutation models in oocytes, spermatocytes and yeast are used to test gene requirements for pole assembly and chromosome segregation. For example, meiotic progression in multinuclear mouse spermatocytes without KIFC1 or cytokinesis forms single-cell late-stage spermatids, demonstrating functional redundancy.
How CRISPR Can Be Used to Study GO:0090619 meiotic spindle pole
Knockout
CRISPR knockout of candidate genes such as AURKA, XMAP215/ZYG-9 or TACC/TAC-1 can test their requirement for meiotic spindle pole assembly and stability. Knockout models have revealed that loss of acentriolar MTOCs disrupts spindle pole Aurora A and spindle assembly in oocytes, and that KIFC1 is dispensable for meiotic progression in mouse spermatocytes.
Point Mutation
CRISPR point mutation allows precise modeling of disease-associated or functional variants in pole genes, enabling assessment of their impact on pole coalescence and chromosome segregation. This approach is valuable for dissecting domain-specific functions of microtubule crosslinkers and motors at the meiotic spindle pole.
Knock-in
Knock-in of fluorescent or epitope tags at endogenous loci enables real-time visualization of pole proteins and their dynamics during meiosis. Tagged knock-in models have been used to track XMAP215/ZYG-9 and TACC/TAC-1 at meiotic spindle poles and Aurora A at acentriolar MTOCs.
Overexpression
CRISPR-mediated overexpression or inducible expression of pole regulators can reveal dosage-sensitive effects on bipolar spindle formation and pole stability. Overexpression models complement knockout studies by testing whether excess protein disrupts normal pole focusing.
How EDITGENE Supports meiotic spindle pole Research
Researchers studying meiotic spindle pole-related genes often need to determine whether a candidate gene is causally involved in pole assembly, focusing or stability, and which variants or expression levels alter meiotic chromosome segregation. EDITGENE provides the CRISPR cell models, screening platforms and bioinformatics support required to move from candidate gene to mechanistic insight.
Contact EDITGENE today to design your custom CRISPR model for meiotic spindle pole research.
Frequently Asked Questions About meiotic spindle pole
What is GO:0090619 meiotic spindle pole?
GO:0090619 is a cellular_component term describing either of the ends of a meiotic spindle where microtubules are organized, usually containing a microtubule organizing center and accessory molecules, spindle microtubules and astral microtubules.
What genes are involved in meiotic spindle pole organization?
Key genes include AURKA, XMAP215/ZYG-9, TACC/TAC-1, KIFC1 and CFAP100, as well as pericentric major satellite transcripts and spindle pole body components in yeast.
Why is the meiotic spindle pole important for chromosome segregation?
The meiotic spindle pole organizes microtubules into a bipolar spindle, which is required for accurate chromosome congression and segregation; pole defects cause missegregation and aneuploidy.
How is the meiotic spindle pole assembled in oocytes?
In oocytes, acentriolar MTOCs accumulate and nucleate microtubules, and Aurora A at these MTOCs is required for assembly of the liquid-like meiotic spindle domain.
What is the role of Aurora A at the meiotic spindle pole?
Aurora A localizes to acentriolar MTOCs and is required for assembly of the liquid-like meiotic spindle domain; loss of acentriolar MTOCs disrupts spindle pole Aurora A and spindle assembly.
How do XMAP215/ZYG-9 and TACC/TAC-1 function at meiotic spindle poles?
XMAP215/ZYG-9 and TACC/TAC-1 act at multiple times during oocyte meiotic spindle assembly and promote both spindle pole coalescence and stability.
Is KIFC1 required for meiosis?
Meiotic progression in multinuclear mouse spermatocytes can occur without the spindle pole clustering motor protein KIFC1 or cytokinesis, forming single-cell late-stage spermatids, indicating context-dependent redundancy.
What diseases are linked to meiotic spindle pole defects?
Meiotic spindle pole defects are linked to aneuploidy, infertility, miscarriage and developmental disorders, and shared pole machinery is relevant to cancer chromosomal instability.
How can CRISPR be used to study meiotic spindle pole genes?
CRISPR knockout, point mutation, knock-in tagging, overexpression and library screening can test gene requirements, variant effects, localization and dosage sensitivity at the meiotic spindle pole.
What methods are used to study meiotic spindle poles?
Live-cell imaging, proteomics, RNA-seq, genetic perturbation and CRISPR-based functional assays are commonly used to study meiotic spindle pole assembly and function.
Conclusion
GO:0090619 (meiotic spindle pole) is a central cellular_component term for understanding how meiotic cells build a bipolar microtubule machine and segregate chromosomes accurately. Its molecular players, including Aurora A, XMAP215/ZYG-9, TACC/TAC-1, KIFC1 and CFAP100, act in a context-dependent manner to promote pole coalescence, stability and integrity. Defects in these processes cause aneuploidy, meiotic arrest and developmental abnormalities, making meiotic spindle pole research highly relevant to reproductive biology and cancer. CRISPR-based knockout, point mutation, knock-in, overexpression and library screening models, combined with imaging and omics methods, provide a powerful toolkit for dissecting this structure and translating findings into clinical insight.
References
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- 2. Borgal L et al.. 2018. Context-dependent spindle pole focusing.. Essays Biochem 62(6):803-813 PMID: 30429281
- 3. Simerly C et al.. 2025. Meiotic progression in multinuclear mouse spermatocytes without the spindle pole clustering motor protein KIFC1 or cytokinesis forms single-cell late-stage spermatids.. Sci Rep 15(1):36399 PMID: 41107451
- 4. Baumann C et al.. 2023. Pericentric major satellite transcription is essential for meiotic chromosome stability and spindle pole organization.. Open Biol 13(11):230133 PMID: 37935356
- 5. Harvey AM et al.. 2023. C. elegans XMAP215/ZYG-9 and TACC/TAC-1 act at multiple times during oocyte meiotic spindle assembly and promote both spindle pole coalescence and stability.. PLoS Genet 19(1):e1010363 PMID: 36608115
- 6. Wang X et al.. 2021. Loss of acentriolar MTOCs disrupts spindle pole Aurora A and assembly of the liquid-like meiotic spindle domain in oocytes.. J Cell Sci 134(14) PMID: 34152366
- 7. Sun S et al.. 2025. CFAP100 couples microtubule glutamylation to spindle pole integrity in keratinocytes to promote epidermal development.. Nat Commun 16(1):5591 PMID: 40593606
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