GO:1902424 negative regulation of attachment of mitotic spindle microtubules to kinetochore: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902424 describes any process that stops, prevents, or reduces the frequency, rate, or extent of spindle microtubule attachment to the kinetochore during mitotic sister chromatid segregation.
• This regulatory process is essential for correcting erroneous kinetochore-microtubule attachments, preventing chromosome mis-segregation and aneuploidy [1,6].
• Key proteins involved include CENP-E, Aurora kinases, MCAK, Ndc80 complex, Ska complex, and CAMP (C13orf8/ZNF828) [1,5,6,7,8].
• Dysregulation of this process is linked to cancer, developmental defects, and aneuploidy-related pathologies [1,4].
• CRISPR knockout, point mutation, knock-in, and overexpression models enable precise dissection of gene function in this pathway [1,7].
• Advanced methods such as live-cell imaging, RNA-seq, and proteomics are used to study the molecular players and dynamics of this regulation [1,6].
Description
The attachment of spindle microtubules to kinetochores is a fundamental step in mitosis, ensuring accurate chromosome segregation. GO:1902424, negative regulation of attachment of mitotic spindle microtubules to kinetochore, encompasses processes that downregulate this attachment, allowing error correction and preventing premature stabilization. This regulation is critical for genomic stability, as improper attachments lead to aneuploidy and cell death. Research into this term has revealed a complex interplay of kinases, motors, and structural proteins that fine-tune kinetochore-microtubule interactions [1,5,7]. Understanding these mechanisms is vital for cancer biology and developmental disorders, where mitotic errors are common. This article synthesizes current knowledge from authoritative sources and provides a guide for experimental investigation using CRISPR and other technologies.
negative regulation of attachment of mitotic spindle microtubules to kinetochore At A Glance
| GO ID | GO:1902424 |
|---|---|
| GO term | negative regulation of attachment of mitotic spindle microtubules to kinetochore |
| Ontology | biological_process |
| Synonym | down regulation of attachment of spindle microtubules to kinetochore during mitosis; inhibition of mitotic bipolar attachment; negative regulation of mitotic attachment of spindle microtubules to kinetochore |
| Major function | Prevents or reduces the attachment of spindle microtubules to kinetochores, allowing error correction and proper chromosome segregation. |
| Related processes | Mitotic spindle organization, chromosome segregation, kinetochore assembly, spindle assembly checkpoint [1,6]. |
| Key regulators | CENP-E, Aurora kinases, MCAK, Ndc80 complex, Ska complex, CAMP [1,5,6,7,8]. |
| Disease relevance | Aneuploidy, cancer, developmental defects [1,4]. |
What Is GO:1902424?
GO:1902424 is defined as any process that stops, prevents, or reduces the frequency, rate, or extent of attachment of spindle microtubules to kinetochore involved in mitotic sister chromatid segregation. In simpler terms, it is the cellular brake that slows or prevents the physical connection between spindle microtubules and kinetochores during mitosis, ensuring that only correct attachments are stabilized.
Why Is negative regulation of attachment of mitotic spindle microtubules to kinetochore Important in Cell Biology?
Regulation of kinetochore-microtubule attachment is crucial for maintaining genomic integrity. Errors in this process can lead to chromosome mis-segregation, aneuploidy, and cell death, which are hallmarks of cancer and developmental disorders [1,4]. Understanding the negative regulation of these attachments provides insights into the mechanisms that safeguard mitosis and offers potential targets for therapeutic intervention.
• Prevents premature stabilization of incorrect kinetochore-microtubule attachments.
• Allows error correction to ensure bipolar attachment and accurate chromosome segregation [1,6].
• Dysregulation leads to aneuploidy, a common feature of cancer cells.
• Involved in the spindle assembly checkpoint, delaying anaphase until all chromosomes are properly attached.
• Key proteins are potential targets for anticancer drugs.
• Plays a role in developmental processes and tissue homeostasis.
• Provides a model for studying protein-protein interactions and kinase signaling [5,7].
• Relevant to understanding chemoresistance and tumor progression.
• Enables research on mitotic timing and fidelity.
• Contributes to the broader field of chromosome biology and genome stability.
What Happens During negative regulation of attachment of mitotic spindle microtubules to kinetochore?
Initiation of attachment and error detection
In simple terms: When microtubules first touch the kinetochore, the cell checks if the connection is correct.
During early mitosis, spindle microtubules probe the kinetochore, and initial attachments are often incorrect (e.g., lateral or monotelic). The cell detects these errors through tension-sensing mechanisms involving Aurora kinases and other regulators. CENP-E, a kinesin motor, plays a key role in chromosome congression and in regulating attachment stability.
Destabilization of incorrect attachments
In simple terms: The cell actively loosens wrong connections to give them a chance to reform correctly.
Negative regulation involves destabilizing incorrect kinetochore-microtubule attachments. MCAK, a kinesin-13, depolymerizes microtubules at the kinetochore to promote turnover and error correction. Aurora kinases phosphorylate kinetochore components to reduce attachment affinity. This process is essential for preventing premature stabilization of erroneous attachments.
Role of the Ndc80 complex and its regulation
In simple terms: The Ndc80 complex is the main anchor for microtubules, and its activity is tuned by other proteins.
The Ndc80 complex forms the core microtubule-binding interface at the kinetochore. Its attachment strength is regulated by phosphorylation and by interacting proteins such as CAMP (C13orf8/ZNF828), which negatively regulates kinetochore-microtubule attachment. Structural studies have revealed how the Ndc80 complex binds microtubules and how modifications can weaken this interaction.
Ska complex and timely progression
In simple terms: The Ska complex helps stabilize attachments, but its regulation ensures timely mitosis.
The Ska complex interacts directly with microtubules and the Ndc80 complex to stabilize attachments. However, its activity is also subject to negative regulation to prevent premature stabilization. Ska3 ensures timely mitotic progression by modulating attachment dynamics. This balance is critical for proper chromosome segregation.
Feedback from centrosomes and Aurora kinases
In simple terms: Signals from centrosomes and Aurora kinases coordinate attachment status with cell cycle progression.
Kinetochore-centrosome feedback involving CENP-E and Aurora kinases controls chromosome congression and attachment stability. Aurora A and B kinases phosphorylate substrates at kinetochores and centrosomes to regulate microtubule attachment and spindle assembly checkpoint signaling. This feedback ensures that only correctly attached chromosomes proceed to anaphase.
Key Genes Involved in GO:1902424 negative regulation of attachment of mitotic spindle microtubules to kinetochore
The following genes and proteins are central to the negative regulation of kinetochore-microtubule attachment, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CENP-E | Kinesin motor involved in chromosome congression and attachment regulation | Regulates attachment stability and spindle checkpoint |
| Aurora A | Kinase that phosphorylates kinetochore and centrosome substrates | Controls spindle assembly and attachment error correction |
| Aurora B | Chromosomal passenger kinase | Phosphorylates kinetochore proteins to destabilize incorrect attachments |
| MCAK | Kinesin-13 microtubule depolymerase | Promotes microtubule turnover at kinetochores for error correction |
| Ndc80 | Core kinetochore-microtubule binding protein | Structural basis of attachment; target of regulatory phosphorylation |
| Nuf2 | Component of Ndc80 complex | Essential for kinetochore-microtubule attachment |
| Spc24 | Component of Ndc80 complex | Required for stable microtubule binding |
| Spc25 | Component of Ndc80 complex | Required for stable microtubule binding |
| Ska1 | Ska complex subunit | Interacts with microtubules and Ndc80 to stabilize attachments |
| Ska2 | Ska complex subunit | Modulates Ska complex function |
| Ska3 | Ska complex subunit | Ensures timely mitotic progression |
| CAMP (C13orf8/ZNF828) | Novel regulator of kinetochore-microtubule attachment | Negatively regulates attachment; potential tumor suppressor |
| SH2D4A | Promotes centrosome maturation | Supports spindle microtubule formation and mitotic progression |
| Lumican | Extracellular matrix protein | Downregulation enhances mitotic defects and aneuploidy |
| BubR1 | Spindle assembly checkpoint kinase | Monitors attachment and regulates checkpoint signaling |
| Mad2 | Spindle assembly checkpoint protein | Inhibits anaphase until attachments are correct |
| PLK1 | Polo-like kinase | Regulates kinetochore-microtubule attachment and checkpoint recovery |
How Is negative regulation of attachment of mitotic spindle microtubules to kinetochore Regulated?
The process of negative regulation of kinetochore-microtubule attachment is itself tightly regulated by phosphorylation and protein-protein interactions. Aurora kinases, particularly Aurora B, phosphorylate kinetochore substrates to reduce attachment affinity, while phosphatases such as PP1 counteract this to stabilize correct attachments. The spindle assembly checkpoint (SAC) monitors attachment status and delays anaphase until all chromosomes are properly bi-oriented. CENP-E and MCAK activities are also modulated by cell cycle kinases, ensuring timely error correction [1,6]. Additionally, the Ska complex is regulated by Aurora B phosphorylation to prevent premature stabilization.
negative regulation of attachment of mitotic spindle microtubules to kinetochore and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Aurora A | Cancer (various solid tumors and leukemias) | Knockout or point mutation in cancer cell lines; xenograft models |
| CENP-E | Aneuploidy, cancer, developmental defects | Knockout in primary cells; patient-derived organoids |
| Lumican | Lung cancer, aneuploidy | Overexpression and knockout in lung cancer cell lines |
| CAMP (ZNF828) | Cancer, kinetochore instability | Knockout and knock-in in HeLa cells |
| MCAK | Cancer, chemoresistance | Point mutation of catalytic domain; overexpression |
Cancer and aneuploidy
Dysregulation of kinetochore-microtubule attachment leads to aneuploidy, a hallmark of many cancers. Downregulation of lumican, an extracellular matrix protein, enhances mitotic defects and aneuploidy in lung cancer cells. Overexpression of Aurora kinases is common in various cancers and correlates with poor prognosis. Targeting the negative regulation of attachment could therefore be a therapeutic strategy.
Developmental disorders
Mutations in genes involved in kinetochore-microtubule attachment can cause developmental defects due to chromosome mis-segregation. For example, defects in CENP-E or Aurora kinases can lead to premature centromere division and mosaic variegated aneuploidy. Understanding these mechanisms may provide insights into rare genetic diseases.
Neurodegeneration
Emerging evidence links mitotic defects and aneuploidy to neurodegenerative diseases such as Alzheimer's. Although direct evidence for GO:1902424 in neurodegeneration is limited, the role of Aurora kinases in neuronal cell cycle re-entry suggests a potential connection.
From negative regulation of attachment of mitotic spindle microtubules to kinetochore-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate kinetochore-microtubule attachment? | CRISPR knockout cell line followed by live-cell imaging of GFP-tagged kinetochore markers |
| What is the role of a specific phosphorylation site in protein Y? | Point mutation (phospho-deficient or phospho-mimetic) knock-in via CRISPR |
| How does a disease-associated mutation affect attachment? | Knock-in of patient mutation in cell lines; patient-derived iPSCs |
| Where and when is protein Z localized during mitosis? | Endogenous knock-in of fluorescent tag (e.g., GFP) using CRISPR |
| Does overexpression of gene W cause mitotic defects? | Doxycycline-inducible overexpression in cell lines |
| What are the interaction partners of protein V? | Knock-in of affinity tag (e.g., BioID, APEX) for proximity proteomics |
How to Study the negative regulation of attachment of mitotic spindle microtubules to kinetochore Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Dynamics of kinetochore-microtubule attachment | Assessing error correction and attachment stability [1,6] |
| RNA-seq | Transcriptional changes | Identifying gene expression signatures upon perturbation |
| Proteomics (AP-MS, BioID) | Protein interactions and modifications | Mapping the interactome of kinetochore proteins [5,7] |
| CRISPR knockout screening | Gene essentiality and synthetic lethality | Discovering novel regulators of mitosis |
| Phosphoproteomics | Phosphorylation sites and signaling | Identifying kinase substrates at kinetochores |
| FRET biosensors | Tension across kinetochores | Measuring attachment status in live cells |
| Electron microscopy | Ultrastructure of kinetochore-microtubule interface | Visualizing attachment defects |
| Flow cytometry | Cell cycle profile and aneuploidy | Quantifying chromosome mis-segregation |
Live-cell imaging
Live-cell imaging of fluorescently tagged kinetochore and microtubule markers allows real-time visualization of attachment dynamics and error correction. This method is essential for assessing the frequency and duration of attachments in wild-type versus mutant cells [1,6].
RNA-seq and transcriptomics
RNA sequencing can reveal changes in gene expression upon perturbation of candidate regulators. It is useful for identifying pathways that compensate or synergize with the negative regulation of attachment.
Proteomics and interactomics
Mass spectrometry-based proteomics, including proximity-dependent labeling (BioID) and affinity purification, can identify protein-protein interactions and post-translational modifications that regulate kinetochore-microtubule attachment [5,7].
CRISPR screening
Genome-wide CRISPR knockout or activation screens can identify novel regulators of mitotic fidelity and kinetochore-microtubule attachment. These screens are powerful for discovering genes that negatively regulate attachment.
How CRISPR Can Be Used to Study GO:1902424 negative regulation of attachment of mitotic spindle microtubules to kinetochore
Knockout
CRISPR knockout of candidate genes (e.g., CENP-E, MCAK, CAMP) can reveal their role in negatively regulating kinetochore-microtubule attachment. Knockout cells often show increased attachment stability, chromosome mis-segregation, and aneuploidy [1,7].
Point Mutation
Introducing point mutations (e.g., phospho-deficient or phospho-mimetic) in genes such as Aurora kinases or Ndc80 can dissect the role of specific residues in attachment regulation. This approach provides mechanistic insights into signaling pathways [1,5].
Knock-in
Knock-in of fluorescent tags (e.g., GFP) or affinity tags (e.g., BioID) allows visualization and interactome analysis of endogenous proteins. This is valuable for studying localization and dynamics of regulators at kinetochores [5,7].
Overexpression
Overexpression of genes like Aurora A or MCAK can cause hyperactive negative regulation, leading to attachment defects and mitotic arrest. Inducible systems allow controlled expression to study dosage effects [1,6].
How EDITGENE Supports negative regulation of attachment of mitotic spindle microtubules to kinetochore Research
Researchers studying negative regulation of attachment of mitotic spindle microtubules to kinetochore-related genes often need to determine whether a candidate gene is causally involved in attachment dynamics, chromosome segregation, and disease. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of attachment of mitotic spindle microtubules to kinetochore research.
Frequently Asked Questions About negative regulation of attachment of mitotic spindle microtubules to kinetochore
What is GO:1902424?
GO:1902424 is a Gene Ontology biological process term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of attachment of spindle microtubules to kinetochore involved in mitotic sister chromatid segregation.
What genes are involved in negative regulation of kinetochore-microtubule attachment?
Key genes include CENP-E, Aurora kinases (A and B), MCAK, Ndc80 complex components (Ndc80, Nuf2, Spc24, Spc25), Ska complex (Ska1, Ska2, Ska3), and CAMP (C13orf8/ZNF828) [1,5,6,7,8].
Why is negative regulation of attachment important for mitosis?
It allows error correction, prevents premature stabilization of incorrect attachments, and ensures accurate chromosome segregation, thereby maintaining genomic stability [1,6].
How does Aurora B kinase negatively regulate kinetochore-microtubule attachment?
Aurora B phosphorylates kinetochore substrates such as Ndc80, reducing their affinity for microtubules and promoting turnover of incorrect attachments [1,5].
What diseases are associated with defects in kinetochore-microtubule attachment?
Defects are linked to aneuploidy, cancer, developmental disorders, and potentially neurodegeneration [1,4].
What methods are used to study negative regulation of kinetochore-microtubule attachment?
Common methods include live-cell imaging, RNA-seq, proteomics, CRISPR screening, and phosphoproteomics [1,4,5,6,7].
How can CRISPR be used to study GO:1902424?
CRISPR knockout, point mutation knock-in, tagged knock-in, and overexpression models allow functional dissection of genes involved in this process [1,5,7].
What is the role of MCAK in kinetochore-microtubule attachment?
MCAK is a kinesin-13 that depolymerizes microtubules at kinetochores, promoting turnover and error correction.
What is the role of CENP-E in mitosis?
CENP-E is a kinesin motor that regulates chromosome congression and attachment stability, and is involved in the spindle assembly checkpoint.
How does the Ska complex contribute to attachment regulation?
The Ska complex interacts with microtubules and Ndc80 to stabilize attachments, but its activity is regulated to ensure timely mitotic progression.
Conclusion
GO:1902424, negative regulation of attachment of mitotic spindle microtubules to kinetochore, is a critical process for mitotic fidelity and genomic stability. Its dysregulation contributes to aneuploidy and cancer, making it a compelling area of research. Advances in CRISPR technology and imaging methods continue to unravel the complex regulatory networks involved. EDITGENE offers a suite of services to support mechanistic studies and therapeutic development targeting this pathway.
References
- 1. Vukušić K et al.. 2025. Kinetochore-centrosome feedback linking CENP-E and Aurora kinases controls chromosome congression.. Nat Commun 16(1):9097 PMID: 41120338
- 2. Yuki R et al.. 2023. SH2D4A promotes centrosome maturation to support spindle microtubule formation and mitotic progression.. Sci Rep 13(1):2067 PMID: 36739326
- 4. Yang CT et al.. 2020. Downregulation of lumican enhanced mitotic defects and aneuploidy in lung cancer cells.. Cell Cycle 19(1):97-108 PMID: 31760859
- 5. Ciferri C et al.. 2008. Implications for kinetochore-microtubule attachment from the structure of an engineered Ndc80 complex.. Cell 133(3):427-39 PMID: 18455984
- 6. Domnitz SB et al.. 2012. MCAK activity at microtubule tips regulates spindle microtubule length to promote robust kinetochore attachment.. J Cell Biol 197(2):231-7 PMID: 22492725
- 7. Itoh G et al.. 2011. CAMP (C13orf8, ZNF828) is a novel regulator of kinetochore-microtubule attachment.. EMBO J 30(1):130-44 PMID: 21063390
- 8. Abad MA et al.. 2016. Ska3 Ensures Timely Mitotic Progression by Interacting Directly With Microtubules and Ska1 Microtubule Binding Domain.. Sci Rep 6:34042 PMID: 27667719
