GO:0072356 chromosome passenger complex localization to kinetochore: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0072356 describes the directed transport and retention of the chromosome passenger complex (CPC) at the kinetochore during mitosis.
• The CPC is a four-subunit complex containing Aurora B kinase, INCENP, Survivin (BIRC5) and Borealin (CDCA8).
• CPC localization to the kinetochore is essential for chromosome bi-orientation, spindle assembly checkpoint signaling and cytokinesis [1,8].
• The INCENP single alpha-helix (SAH) domain binds microtubules directly and is required for CPC localization and mitotic function.
• CPC positioning is regulated by phosphorylation, phase separation and interactions with kinetochore and microtubule-binding proteins [3,5].
• Dysregulated CPC localization is linked to chromosomal instability and cancer, making it a target for mechanistic and therapeutic studies.
Description
The chromosome passenger complex (CPC) is a conserved four-subunit protein machine that orchestrates multiple mitotic events, including chromosome bi-orientation, spindle assembly checkpoint signaling and cytokinesis. Its correct function depends on precise spatial regulation: the complex must be delivered to and retained at the inner centromere and kinetochore during early mitosis, then relocate to the central spindle and midbody at anaphase. The Gene Ontology term GO:0072356, chromosome passenger complex localization to kinetochore, captures this directed transport and maintenance step. Understanding this process is critical because mislocalization of the CPC disrupts chromosome segregation and can drive aneuploidy and tumorigenesis. Mechanistically, CPC localization to the kinetochore requires the combined action of centromeric chromatin marks, kinetochore scaffold proteins and microtubule-binding activities [1,5]. The INCENP SAH domain directly binds microtubules and is important for CPC localization and function in mitosis. In trypanosomes, orphan kinesins KIN-A and KIN-B control dynamic CPC localization, illustrating evolutionary diversity in the machinery that positions the complex. In Plasmodium berghei, a modular CPC rewires chromosome segregation, further highlighting how localization determinants can be rewired across species. For researchers, GO:0072356 provides a precise annotation target for genetic, imaging and proteomic studies of mitosis. Assays that perturb candidate genes and then quantify CPC accumulation at kinetochores can directly test whether a factor is required for this localization step [3,4]. Because the CPC is essential and its misregulation is associated with chromosomal instability, this term is relevant to cancer biology, parasite cell division and fundamental chromosome segregation research [2,7,8].
chromosome passenger complex localization to kinetochore At A Glance
| GO ID | GO:0072356 |
|---|---|
| GO term | chromosome passenger complex localization to kinetochore |
| Ontology | biological_process |
| Synonym | chromosomal passenger complex localization to kinetochore; chromosome passenger complex localisation to kinetochore; CPC complex localization to kinetochore; CPC localization to kinetochore |
| Major function | Transport and retention of the CPC at the kinetochore during mitosis |
| Complex components | Aurora B kinase, INCENP, Survivin (BIRC5), Borealin (CDCA8) |
| Cellular context | Mitosis, inner centromere and kinetochore |
| Related processes | Chromosome bi-orientation, spindle assembly checkpoint, cytokinesis |
What Is GO:0072356?
GO:0072356 is a biological process term describing the cellular protein complex localization that transports or maintains the chromosome passenger complex at a specific location at the kinetochore. The chromosome passenger complex itself contains Survivin (a BIR-domain protein), Aurora B kinase, INCENP and Borealin, and coordinates mitotic events based on its position within the cell.
Why Is chromosome passenger complex localization to kinetochore Important in Cell Biology?
GO:0072356 is important because the CPC must be correctly positioned at the kinetochore to correct erroneous microtubule attachments, satisfy the spindle assembly checkpoint and ensure faithful chromosome segregation [1,8]. When this localization step fails, cells can mis-segregate chromosomes, leading to aneuploidy and chromosomal instability, which are hallmarks of cancer and contributors to developmental defects. The term also provides a defined annotation for comparative and evolutionary studies of mitosis, as shown by work in trypanosomes and Plasmodium [2,6].
• Ensures accurate chromosome bi-orientation and segregation during mitosis.
• Required for spindle assembly checkpoint signaling and error correction.
• Prevents chromosomal instability and aneuploidy associated with cancer.
• Coordinates the timing of CPC relocation from centromere to midbody.
• Provides a mechanistic target for anti-mitotic and anti-parasitic strategies [2,6].
• Serves as a model for studying protein complex localization and phase separation.
• Links microtubule dynamics to kinase signaling through INCENP and Aurora B.
• Enables comparative mitosis research across divergent eukaryotes [4,6].
What Happens During chromosome passenger complex localization to kinetochore?
Recognition of centromeric and kinetochore landmarks
In simple terms: The CPC first finds the right spot on the chromosome by reading chemical marks and binding to scaffold proteins.
CPC localization begins with recognition of centromeric chromatin and kinetochore components. The complex is recruited to the inner centromere through interactions with histone modifications and scaffold proteins, and this positioning is a prerequisite for subsequent kinetochore accumulation. The INCENP SAH domain contributes to this process by binding microtubules directly, which helps the CPC engage with the mitotic apparatus. In trypanosomes, orphan kinesins KIN-A and KIN-B control dynamic CPC localization, showing that motor proteins can define where the complex accumulates.
Microtubule-dependent transport and retention
In simple terms: Once the CPC is near the chromosome, microtubules and motor activities help move and hold it at the kinetochore.
Microtubule interactions are central to CPC localization. The INCENP SAH domain binds directly to microtubules and is important for CPC localization and function in mitosis. CPC interactions with both chromosomes and microtubules are important for spindle assembly and function, indicating that the complex integrates chromosome-derived and microtubule-derived signals to reach the kinetochore. In Paradiplonema papillatum, unique mitotic mechanisms have been discovered, underscoring that microtubule-dependent localization strategies can vary across species.
Phase separation and dynamic exchange
In simple terms: The CPC can form liquid-like droplets that concentrate it at the right place, and this behavior can be tested experimentally.
Phase separation has been proposed as a determinant of macromolecular localization, and validation strategies have been developed to assess its role in positioning complexes such as the CPC. This means that CPC accumulation at the kinetochore may involve condensate formation in addition to direct protein-protein and protein-microtubule interactions. Such mechanisms help explain how the CPC can be enriched at specific mitotic structures while remaining dynamic.
Maintenance and transition to later mitotic stages
In simple terms: After reaching the kinetochore, the CPC must stay there long enough to do its job before moving to the midbody.
Localization to the kinetochore is not a terminal state; the CPC must be maintained there during early mitosis and then relocate to the central spindle and midbody at anaphase. This dynamic behavior is driven by microtubule interactions and regulatory phosphorylation [1,5]. In Plasmodium berghei, a modular CPC rewires chromosome segregation, indicating that the maintenance and transition steps can be remodeled during evolution.
Key Genes Involved in GO:0072356 chromosome passenger complex localization to kinetochore
The following genes encode the core CPC subunits and key regulators that control chromosome passenger complex localization to kinetochore.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AURKB | Aurora B kinase catalytic subunit of the CPC | Target for kinase inhibitors and localization studies |
| INCENP | Scaffold subunit; SAH domain binds microtubules | Required for CPC localization and function |
| BIRC5 | Survivin; BIR-domain protein in the CPC | Links CPC to centromeric chromatin and apoptosis |
| CDCA8 | Borealin; CPC subunit | Essential for CPC assembly and kinetochore targeting |
| KIN-A | Orphan kinesin controlling CPC localization in trypanosomes | Model for motor-driven CPC positioning |
| KIN-B | Orphan kinesin controlling CPC localization in trypanosomes | Model for motor-driven CPC positioning |
| HP1 | Heterochromatin protein involved in preventing chromosomal instability | Connects chromatin state to CPC function |
| NDC80 | Kinetochore component | Kinetochore scaffold for CPC targeting |
| KNL1 | Kinetochore scaffold | Spindle assembly checkpoint and CPC regulation |
| BUB1 | Spindle assembly checkpoint kinase | Coordinates CPC and checkpoint signaling |
| PLK1 | Polo-like kinase 1 | Regulates CPC localization and mitotic progression |
| CDK1 | Cyclin-dependent kinase 1 | Phosphorylates CPC subunits to control timing |
| HASPIN | Histone H3 kinase | Generates centromeric marks for CPC recruitment |
| BUBR1 | Spindle assembly checkpoint protein | Links CPC to error correction |
| MAD2 | Spindle assembly checkpoint protein | Monitors kinetochore-microtubule attachments |
| TPX2 | Microtubule-associated protein | Contributes to spindle assembly with CPC |
| AURKA | Aurora A kinase | Cooperates with CPC in mitotic regulation |
How Is chromosome passenger complex localization to kinetochore Regulated?
CPC localization to the kinetochore is regulated by phosphorylation, chromatin marks and microtubule dynamics. Aurora B kinase activity and CDK1-dependent phosphorylation of CPC subunits control the timing and extent of kinetochore accumulation. The INCENP SAH domain binds microtubules directly, and this interaction is important for CPC localization and function. Phase separation has been proposed as a determinant of macromolecular localization, and validation strategies can test whether condensate formation contributes to CPC positioning. In trypanosomes, orphan kinesins KIN-A and KIN-B control dynamic CPC localization, showing that motor proteins can regulate this process. HP1 function is also linked to preventing chromosomal instability, connecting chromatin state to CPC-dependent mitotic fidelity.
chromosome passenger complex localization to kinetochore and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| AURKB | Cancer, chromosomal instability | Knockout and point-mutation cell lines |
| BIRC5 | Cancer, apoptosis evasion | Overexpression and knockout models |
| HP1 | Chromosomal instability | Knockout and rescue models |
| KIN-A | Parasite cell division | Knockout in Trypanosoma |
| KIN-B | Parasite cell division | Knockout in Trypanosoma |
Cancer and chromosomal instability
Dysregulated CPC localization can lead to chromosomal instability, a hallmark of many cancers. HP1 functions in preventing chromosomal instability, and loss of such protective mechanisms can cooperate with CPC mislocalization to drive aneuploidy. Because Aurora B and other CPC subunits are overexpressed in various tumors, understanding GO:0072356 is relevant to anti-mitotic therapeutic strategies.
Parasitic diseases
Divergent eukaryotes rely on CPC-like complexes for chromosome segregation. In Plasmodium berghei, a modular CPC rewires chromosome segregation, and in trypanosomes, KIN-A and KIN-B control CPC localization [2,6]. These differences highlight potential parasite-specific vulnerabilities that could be exploited for anti-parasitic drug development [2,6].
Developmental and mitotic disorders
Faithful chromosome segregation is essential for development. CPC interactions with chromosomes and microtubules are important for spindle assembly and function, and defects in these interactions can impair cell division. Research in Paradiplonema papillatum has revealed unique mitotic mechanisms, showing that even essential processes can diverge and that their disruption may have organism-specific consequences.
From chromosome passenger complex localization to kinetochore-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for CPC localization to kinetochore? | Knockout cell line followed by imaging |
| Does a specific phosphorylation site control CPC timing? | Point-mutation knock-in |
| Can a tagged CPC subunit be tracked in live cells? | Tagged knock-in (e.g., GFP) |
| Does overexpression of Aurora B alter kinetochore accumulation? | Overexpression cell model |
| Which genes modify CPC localization in a parasite? | Knockout in Plasmodium or Trypanosoma [2,6] |
| Does phase separation contribute to CPC positioning? | Phase separation validation assay |
How to Study the chromosome passenger complex localization to kinetochore Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell fluorescence imaging | Real-time CPC localization | Tracking kinetochore accumulation |
| Immunofluorescence | Fixed-cell CPC distribution | Quantifying kinetochore signal |
| Affinity purification-mass spectrometry | CPC interactome | Identifying localization regulators |
| CRISPR knockout | Gene requirement for localization | Loss-of-function screens |
| Point-mutation knock-in | Domain-specific function | Testing phosphorylation sites |
| Phase separation assay | Condensate formation | Validating localization mechanism |
| RNAi knockdown | Acute depletion of CPC subunits | Rescue experiments |
| High-content screening | Phenotypic profiling of mitosis | Identifying modifiers of CPC localization |
Live-cell imaging of CPC dynamics
Fluorescently tagged CPC subunits, such as GFP-INCENP or Aurora B reporters, allow real-time tracking of localization to the kinetochore. This approach can quantify accumulation kinetics and maintenance at kinetochores and has been used to study CPC behavior in multiple systems [3,5].
Proteomic and interactome analysis
Affinity purification coupled with mass spectrometry can identify proteins that associate with the CPC and regulate its localization. Such studies help define the molecular environment required for kinetochore targeting and have been applied to CPC components.
Genetic perturbation and rescue
Knockout, knockdown or point-mutation strategies followed by rescue with wild-type or mutant CPC subunits can test which domains are required for localization. The INCENP SAH domain, for example, has been dissected using such approaches.
Phase separation assays
Validation strategies to assess the role of phase separation as a determinant of macromolecular localization can be applied to CPC subunits. These assays test whether condensate formation contributes to kinetochore enrichment and can complement imaging and biochemical studies.
How CRISPR Can Be Used to Study GO:0072356 chromosome passenger complex localization to kinetochore
Knockout
CRISPR knockout of CPC subunit genes such as AURKB, INCENP, BIRC5 or CDCA8 can abolish chromosome passenger complex localization to kinetochore and cause mitotic arrest or chromosome mis-segregation. Knockout cell lines are valuable for testing whether a candidate gene is required for this process.
Point Mutation
Point-mutation knock-in can be used to dissect specific residues within CPC subunits, such as phosphorylation sites in INCENP or Aurora B, that control the timing and extent of kinetochore localization. This approach preserves endogenous expression levels while altering a single function [1,5].
Knock-in
Tagged knock-in of CPC subunits with fluorescent or affinity tags enables live-cell imaging and proteomic analysis of the complex at kinetochores. This strategy has been used to track CPC dynamics and to validate localization mechanisms.
Overexpression
Overexpression of wild-type or mutant CPC subunits can test whether excess protein alters kinetochore accumulation or disrupts mitosis. Such models are useful for studying gain-of-function effects and for validating dominant-negative constructs.
How EDITGENE Supports chromosome passenger complex localization to kinetochore Research
Researchers studying chromosome passenger complex localization to kinetochore-related genes often need to determine whether a candidate gene is causally involved in CPC targeting, maintenance or function. EDITGENE provides the CRISPR tools and cell models required to move from correlation to causation.
Contact EDITGENE today to design your custom CRISPR model for chromosome passenger complex localization to kinetochore research.
Frequently Asked Questions About chromosome passenger complex localization to kinetochore
What is chromosome passenger complex localization to kinetochore?
It is the biological process, annotated as GO:0072356, by which the chromosome passenger complex is transported to and maintained at the kinetochore during mitosis.
What genes are involved in chromosome passenger complex localization to kinetochore?
Core genes include AURKB, INCENP, BIRC5 and CDCA8, with additional regulators such as KIN-A, KIN-B, HP1 and kinetochore proteins [1,5,6,7].
Why is CPC localization to the kinetochore important?
It ensures correct chromosome bi-orientation, spindle assembly checkpoint signaling and faithful chromosome segregation, preventing aneuploidy [1,8].
What is the chromosome passenger complex made of?
The CPC contains Aurora B kinase, INCENP, Survivin (BIRC5) and Borealin (CDCA8).
How is CPC localization regulated?
It is regulated by phosphorylation, microtubule binding via the INCENP SAH domain, phase separation and motor proteins such as KIN-A and KIN-B [1,3,5,6].
What happens if CPC localization fails?
Failure can lead to chromosomal instability, aneuploidy and mitotic defects associated with cancer and developmental disorders.
Which diseases are linked to CPC mislocalization?
Cancer and chromosomal instability are strongly linked, and parasite-specific CPC mechanisms are relevant to parasitic diseases [2,6,7].
How can I study CPC localization in the lab?
Live-cell imaging, immunofluorescence, CRISPR knockout, point-mutation knock-in and phase separation assays are commonly used [1,3,5].
What model organisms are used to study CPC localization?
Human cell lines, Trypanosoma, Plasmodium berghei and Paradiplonema papillatum have been used to study CPC localization mechanisms [2,4,6].
Does EDITGENE provide services for CPC localization research?
Yes, EDITGENE offers knockout, point-mutation, knock-in, overexpression, CRISPR library screening and bioinformatics services for CPC-related genes.
Conclusion
GO:0072356, chromosome passenger complex localization to kinetochore, defines a critical mitotic process that positions the CPC for accurate chromosome segregation. Its molecular basis involves Aurora B, INCENP, Survivin and Borealin, with regulation by phosphorylation, microtubule binding and phase separation [1,3,5]. Dysregulation of this process is linked to chromosomal instability and cancer, and comparative studies in parasites reveal divergent mechanisms [2,6,7]. Researchers can leverage CRISPR knockout, point-mutation, knock-in and overexpression models to dissect the genetic requirements for CPC localization. EDITGENE provides end-to-end support for these studies, from model generation to screening and bioinformatics.
References
- 1. Trivedi P et al.. 2020. A Condensed View of the Chromosome Passenger Complex.. Trends Cell Biol 30(9):676-687 PMID: 32684321
- 2. Roques M et al.. 2026. A modular chromosomal passenger complex rewires chromosome segregation in Plasmodium berghei.. Nat Commun 17(1) PMID: 42323312
- 3. Hedtfeld M et al.. 2024. A validation strategy to assess the role of phase separation as a determinant of macromolecular localization.. Mol Cell 84(9):1783-1801.e7 PMID: 38614097
- 4. Akiyoshi B et al.. 2025. Discovery of unique mitotic mechanisms in Paradiplonema papillatum.. Open Biol 15(8):250096 PMID: 40763799
- 5. Samejima K et al.. 2015. The Inner Centromere Protein (INCENP) Coil Is a Single α-Helix (SAH) Domain That Binds Directly to Microtubules and Is Important for Chromosome Passenger Complex (CPC) Localization and Function in Mitosis.. J Biol Chem 290(35):21460-72 PMID: 26175154
- 6. Ballmer D et al.. 2024. Dynamic localization of the chromosomal passenger complex in trypanosomes is controlled by the orphan kinesins KIN-A and KIN-B.. Elife 13 PMID: 38564240
- 7. Ding Z et al.. 2024. Functions of HP1 in preventing chromosomal instability.. Cell Biochem Funct 42(3):e4017 PMID: 38603595
- 8. McKim KS. 2022. Highway to hell-thy meiotic divisions: Chromosome passenger complex functions driven by microtubules: CPC interactions with both the chromosomes and microtubules are important for spindle assembly and function: CPC interactions with both the chromosomes and microtubules are important for spindle assembly and function.. Bioessays 44(1):e2100202 PMID: 34821405
