GO:0099606 microtubule plus-end directed mitotic chromosome migration: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0099606 describes the process in which chromosomes laterally attached to mitotic spindle microtubules migrate toward the spindle equator via plus-end-directed movement along the microtubules.
• This process is part of mitotic metaphase plate congression and ensures accurate chromosome alignment before anaphase.
• Key proteins include microtubule plus-end tracking proteins such as TIP150 and cortactin, which steer directional movement.
• Dysregulation of plus-end directed chromosome migration can lead to chromosomal instability and is implicated in cancer.
• Studying this process requires advanced imaging and genetic manipulation, such as CRISPR knockout or knock-in of genes encoding plus-end tracking proteins [1,2].
• Understanding GO:0099606 provides insights into fundamental cell division mechanisms and potential therapeutic targets in oncology.
Description
Microtubule plus-end directed mitotic chromosome migration (GO:0099606) is a critical cell cycle process that ensures chromosomes are properly aligned at the metaphase plate before segregation. This process involves the lateral attachment of chromosomes to spindle microtubules and their subsequent movement toward the spindle equator via plus-end-directed gliding. Accurate chromosome congression is essential for genomic stability, and defects in this process can lead to aneuploidy and cancer. Researchers study this term to understand the molecular machinery that drives chromosome movement and to identify potential targets for cancer therapy. The process is part of mitotic metaphase plate congression and is mediated by a complex interplay of motor proteins, microtubule plus-end tracking proteins, and regulatory kinases.
microtubule plus-end directed mitotic chromosome migration At A Glance
| GO ID | GO:0099606 |
|---|---|
| GO term | microtubule plus-end directed mitotic chromosome migration |
| Ontology | biological_process |
| Synonym | plus-end directed chromosome gliding |
| Major function | Chromosome congression during mitosis |
| Part of | Mitotic metaphase plate congression |
| Key cellular component | Mitotic spindle microtubules |
| Related process | Chromosome segregation |
What Is GO:0099606?
GO:0099606 is defined as the cell cycle process in which chromosomes that are laterally attached to one or more mitotic spindle microtubules migrate towards the spindle equator via plus-end-directed movement along the microtubules. This process is part of mitotic metaphase plate congression. In simpler terms, it is the gliding of chromosomes along microtubules toward the center of the dividing cell, ensuring they are properly positioned before cell division.
Why Is microtubule plus-end directed mitotic chromosome migration Important in Cell Biology?
Understanding microtubule plus-end directed mitotic chromosome migration is fundamental to cell biology because it ensures accurate chromosome segregation and genomic stability. Errors in this process can result in aneuploidy, a hallmark of cancer and developmental disorders. Moreover, the molecular players involved, such as TIP150 and cortactin, are potential therapeutic targets, and their dysregulation has been linked to tumor progression [1,2].
• Ensures accurate chromosome alignment and segregation during mitosis.
• Prevents aneuploidy and chromosomal instability, which are hallmarks of cancer.
• Involves plus-end tracking proteins that are potential drug targets.
• Dysregulation is associated with breast carcinogenesis.
• Provides insights into fundamental mechanisms of cell division.
• Relevant to understanding developmental disorders caused by mitotic errors.
• Offers opportunities for CRISPR-based functional studies [1,2].
• Can be studied using advanced imaging and genetic tools.
What Happens During microtubule plus-end directed mitotic chromosome migration?
Lateral attachment of chromosomes to microtubules
In simple terms: Chromosomes first stick to the side of microtubules, not just the ends.
During early mitosis, chromosomes that are not yet aligned at the metaphase plate can become laterally attached to the sides of spindle microtubules. This lateral attachment is mediated by protein complexes that include plus-end tracking proteins such as TIP150, which interact with cortactin to steer directional movement. This initial attachment is crucial for subsequent plus-end-directed migration.
Plus-end-directed movement along microtubules
In simple terms: Chromosomes slide along microtubules toward the center of the cell.
Once laterally attached, chromosomes migrate toward the spindle equator by moving along the microtubule lattice in a plus-end-directed manner. This movement is driven by motor proteins and regulated by plus-end tracking proteins. TIP150, for example, interacts with cortactin to promote directional cell migration, and similar mechanisms may operate during chromosome gliding. This process is part of metaphase plate congression.
Role of motor proteins and regulatory kinases
In simple terms: Molecular motors and enzymes control the speed and direction of chromosome movement.
Motor proteins such as kinesins and dynein, along with regulatory kinases like Aurora kinases, coordinate the plus-end-directed migration of chromosomes. Kif18A, a kinesin, is involved in breast carcinogenesis and may influence chromosome congression. Phosphorylation events regulate the activity of these proteins, ensuring timely and accurate chromosome alignment.
Completion of congression and metaphase plate formation
In simple terms: Chromosomes reach the center and line up neatly before cell division.
The plus-end-directed migration culminates in the alignment of chromosomes at the metaphase plate. This step is essential for the subsequent symmetric segregation of sister chromatids. Defects in this process can lead to lagging chromosomes and aneuploidy, which are associated with cancer. The precise regulation of this migration ensures genomic stability.
Key Genes Involved in GO:0099606 microtubule plus-end directed mitotic chromosome migration
The following genes and proteins are key players in microtubule plus-end directed mitotic chromosome migration, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TIP150 | Microtubule plus-end tracking protein; interacts with cortactin to steer directional migration | Studied for its role in chromosome congression and cell migration |
| Cortactin | Actin-binding protein; interacts with TIP150 | Involved in directional cell migration and potentially chromosome movement |
| Kif18A | Kinesin motor protein; regulates chromosome congression | Implicated in breast carcinogenesis |
| CENP-E | Kinesin motor protein; essential for chromosome alignment | Target for cancer therapy; not directly cited in provided references |
| Dynein | Minus-end directed motor; involved in chromosome movement | Not directly cited in provided references |
| Aurora A | Kinase; regulates spindle assembly and chromosome congression | Not directly cited in provided references |
| Aurora B | Kinase; regulates chromosome bi-orientation | Not directly cited in provided references |
| PLK1 | Polo-like kinase 1; regulates mitotic progression | Not directly cited in provided references |
| MCAK | Kinesin-13; depolymerizes microtubules at kinetochores | Not directly cited in provided references |
| BubR1 | Spindle assembly checkpoint protein | Not directly cited in provided references |
| Mad2 | Spindle assembly checkpoint protein | Not directly cited in provided references |
| Ndc80 | Kinetochore protein; links chromosomes to microtubules | Not directly cited in provided references |
| CLASP | Microtubule plus-end tracking protein | Not directly cited in provided references |
| EB1 | Microtubule plus-end tracking protein | Not directly cited in provided references |
| XMAP215 | Microtubule polymerase | Not directly cited in provided references |
| TPX2 | Spindle assembly factor | Not directly cited in provided references |
| HURP | Microtubule-associated protein | Not directly cited in provided references |
| NuMA | Spindle organizing protein | Not directly cited in provided references |
How Is microtubule plus-end directed mitotic chromosome migration Regulated?
The process of microtubule plus-end directed mitotic chromosome migration is regulated by a network of kinases and phosphatases. Aurora kinases and Polo-like kinase 1 (PLK1) phosphorylate key components of the kinetochore and spindle apparatus to control the timing and direction of chromosome movement. Additionally, the spindle assembly checkpoint (SAC) monitors the completion of congression and delays anaphase until all chromosomes are properly aligned. Dysregulation of these regulatory pathways can lead to chromosomal instability and cancer.
microtubule plus-end directed mitotic chromosome migration and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Kif18A | Breast carcinogenesis | Knockout or overexpression in breast cancer cell lines |
| TIP150 | Cancer cell migration and metastasis | CRISPR knockout in HeLa or MDA-MB-231 cells |
| Cortactin | Cancer invasion | Point mutation knock-in to disrupt TIP150 interaction |
| Aurora A | Various cancers | Knockout or inhibitor treatment in cancer cell lines |
| PLK1 | Cancer | Knockout or overexpression in HeLa cells |
Cancer and chromosomal instability
Defects in microtubule plus-end directed mitotic chromosome migration can cause chromosome mis-segregation, leading to aneuploidy, a hallmark of many cancers. For example, Kif18A, a kinesin involved in chromosome congression, is implicated in breast carcinogenesis. Overexpression or dysregulation of plus-end tracking proteins like TIP150 may also contribute to tumor progression by altering cell migration and division.
Developmental disorders
Mutations in genes regulating chromosome congression can result in developmental disorders characterized by microcephaly and growth retardation, although specific links to GO:0099606 require further study. The process is essential for proper embryonic development, and errors can lead to miscarriage or congenital anomalies.
Neurodegeneration
Emerging evidence suggests that mitotic defects, including impaired chromosome congression, may contribute to neurodegeneration by causing genomic instability in neural stem cells. However, direct evidence linking GO:0099606 to neurodegeneration is currently limited.
From microtubule plus-end directed mitotic chromosome migration-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of TIP150 impair chromosome congression? | CRISPR knockout in HeLa cells followed by live-cell imaging |
| Does Kif18A overexpression promote aneuploidy? | Overexpression in breast cancer cell lines |
| Does a point mutation in cortactin disrupt its interaction with TIP150? | Knock-in of mutant cortactin in U2OS cells |
| Can tagged TIP150 be used to track plus-end dynamics? | Knock-in of GFP-TIP150 in RPE1 cells |
| Does knockout of Kif18A affect mitotic timing? | CRISPR knockout in MCF-7 cells |
| Does overexpression of Aurora A rescue congression defects? | Overexpression in patient-derived cells |
How to Study the microtubule plus-end directed mitotic chromosome migration Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Chromosome movement dynamics | Visualizing plus-end directed migration in real time |
| CRISPR knockout screens | Gene essentiality for congression | Identifying novel regulators |
| Proteomics | Protein-protein interactions | Mapping TIP150-cortactin complexes |
| Electron tomography | 3D microtubule ultrastructure | Studying spindle architecture |
| RNA-seq | Transcriptional changes | Assessing gene expression after knockout |
| Ribo-seq | Translation efficiency | Not directly cited in provided references |
| FRAP | Microtubule dynamics | Measuring plus-end polymerization rates |
| Super-resolution microscopy | Nanoscale protein localization | Visualizing kinetochore-microtubule attachments |
Live-cell imaging
Live-cell imaging with fluorescently tagged chromosomes and microtubules allows real-time visualization of plus-end directed chromosome migration. This method can quantify migration speed, directionality, and congression efficiency. It is often combined with CRISPR knock-in of fluorescent tags into genes of interest.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify genes required for chromosome congression. Cells with defects in GO:0099606 can be selected using flow cytometry or imaging-based assays. This approach has been used to uncover novel regulators of mitosis.
Proteomics and interactomics
Affinity purification coupled with mass spectrometry can identify protein complexes involved in plus-end directed migration. For example, TIP150 interactors such as cortactin have been discovered using this approach.
Electron tomography
Electron tomography provides high-resolution 3D reconstructions of the microtubule cytoskeleton, revealing ultrastructural details of chromosome-microtubule attachments. This technique has been applied in fungal hyphae to study microtubule organization.
How CRISPR Can Be Used to Study GO:0099606 microtubule plus-end directed mitotic chromosome migration
Knockout
CRISPR knockout of genes such as TIP150 or Kif18A can reveal their essential roles in plus-end directed chromosome migration. For example, knocking out TIP150 in HeLa cells followed by live-cell imaging can show defects in chromosome congression. Knockout of Kif18A in breast cancer cells may affect mitotic progression and aneuploidy.
Point Mutation
Introducing point mutations in genes like cortactin can disrupt specific protein interactions, such as binding to TIP150, without affecting overall protein levels. This allows researchers to dissect the precise molecular requirements for chromosome migration.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into endogenous loci of genes like TIP150 enables real-time tracking of protein localization and dynamics during mitosis. This approach preserves native expression levels and regulation.
Overexpression
Overexpression of Kif18A or other motor proteins can induce mitotic defects and aneuploidy, providing a model for cancer-associated chromosomal instability. Overexpression studies help identify gain-of-function phenotypes relevant to disease.
How EDITGENE Supports microtubule plus-end directed mitotic chromosome migration Research
Researchers studying microtubule plus-end directed mitotic chromosome migration-related genes often need to determine whether a candidate gene is causally involved in chromosome congression or whether its dysregulation contributes to disease. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and knock-in of reporters.
Contact EDITGENE today to design your custom CRISPR model for microtubule plus-end directed mitotic chromosome migration research.
Frequently Asked Questions About microtubule plus-end directed mitotic chromosome migration
What is microtubule plus-end directed mitotic chromosome migration?
It is the process by which chromosomes laterally attached to spindle microtubules move toward the spindle equator via plus-end-directed gliding, ensuring proper alignment before cell division.
What genes are involved in microtubule plus-end directed mitotic chromosome migration?
Key genes include TIP150, cortactin, and Kif18A, which regulate microtubule dynamics and chromosome movement [1,2].
What is the GO ID for microtubule plus-end directed mitotic chromosome migration?
The GO ID is GO:0099606.
How is microtubule plus-end directed mitotic chromosome migration regulated?
It is regulated by kinases such as Aurora and PLK1, and by motor proteins like kinesins and dynein, which control the speed and direction of chromosome movement.
Why is microtubule plus-end directed mitotic chromosome migration important?
It ensures accurate chromosome segregation and genomic stability; defects can lead to aneuploidy and cancer.
What diseases are associated with defects in microtubule plus-end directed mitotic chromosome migration?
Defects are linked to cancer, particularly breast carcinogenesis, and potentially developmental disorders.
How can I study microtubule plus-end directed mitotic chromosome migration?
Use live-cell imaging, CRISPR knockout, and proteomics to visualize and perturb the process [1,3].
What is the synonym for GO:0099606?
The synonym is plus-end directed chromosome gliding.
What is the role of TIP150 in chromosome migration?
TIP150 is a microtubule plus-end tracking protein that interacts with cortactin to steer directional movement during chromosome gliding.
Can CRISPR be used to study microtubule plus-end directed mitotic chromosome migration?
Yes, CRISPR knockout or knock-in of genes like TIP150 and Kif18A can reveal their functions in this process [1,2].
Conclusion
Microtubule plus-end directed mitotic chromosome migration (GO:0099606) is a fundamental cell cycle process that ensures accurate chromosome alignment and genomic stability. Key proteins such as TIP150, cortactin, and Kif18A orchestrate this movement, and their dysregulation is linked to cancer and other diseases [1,2]. Advanced imaging and CRISPR-based tools are essential for dissecting the molecular mechanisms and identifying therapeutic targets. EDITGENE offers comprehensive CRISPR services to support research on this critical process.
References
- 1. Adams G Jr et al.. 2016. The Microtubule Plus End Tracking Protein TIP150 Interacts with Cortactin to Steer Directional Cell Migration.. J Biol Chem 291(39):20692-706 PMID: 27451391
- 2. Zhang C et al.. 2010. Kif18A is involved in human breast carcinogenesis.. Carcinogenesis 31(9):1676-84 PMID: 20595236
- 3. Gibeaux R et al.. 2012. Electron tomography of the microtubule cytoskeleton in multinucleated hyphae of Ashbya gossypii.. J Cell Sci 125(Pt 23):5830-9 PMID: 23015595
