GO:0051983 regulation of chromosome segregation: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051983 regulation of chromosome segregation describes any biological process that modulates the frequency, rate or extent of chromosome segregation, the orderly separation of sister chromatids or homologous chromosomes during cell division.
• Chromosome segregation is driven by spindle microtubules, kinesin motors, dynein, cohesin and condensin complexes, and is monitored by checkpoints that delay anaphase until errors are corrected.
• Regulation occurs at multiple levels, including motor protein activity, cohesin acetylation and cleavage, chromosome condensation, and nuclear envelope remodeling in closed mitosis.
• Defects in chromosome segregation regulation cause aneuploidy, a hallmark of cancer and a cause of infertility, miscarriage and developmental disorders.
• CRISPR knockout, point-mutation, knock-in and overexpression models enable causal testing of segregation regulators in human cells and model organisms.
• EDITGENE provides end-to-end CRISPR cell model and library screening services to dissect regulation of chromosome segregation at scale.
Description
GO:0051983 regulation of chromosome segregation is a Gene Ontology biological process term that covers any process that modulates the frequency, rate or extent of chromosome segregation, the mechanism by which sister chromatids or homologous chromosomes are physically separated during mitosis and meiosis. Accurate chromosome segregation depends on the coordinated action of the spindle apparatus, microtubule motors, cohesin and condensin complexes, and cell-cycle checkpoints that detect and correct attachment errors. Because errors in this process produce aneuploidy, a common feature of cancer and a cause of infertility and developmental disorders, understanding its regulation is a central goal in cell biology and medicine. Research on regulation of chromosome segregation spans model organisms from yeast to mouse oocytes and human cells, and employs genetics, live-cell imaging, proteomics and CRISPR-based perturbation. Key regulatory nodes include kinesin-8 motors that control microtubule dynamics and chromosome movements, dynein that positions the spindle and clears checkpoint proteins, and cohesin complexes whose acetylation and cleavage are tightly regulated during meiosis. This article summarizes the ontology definition, core mechanisms, key genes, disease links, and experimental strategies for studying GO:0051983, with a focus on how CRISPR models and screening can accelerate discovery.
regulation of chromosome segregation At A Glance
| GO ID | GO:0051983 |
|---|---|
| GO term | regulation of chromosome segregation |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Modulates the frequency, rate or extent of chromosome segregation during mitosis and meiosis |
| Key molecular players | Kinesin-8 motors, dynein, cohesin (including Rec8), condensin, spindle checkpoint proteins |
| Cellular context | Mitosis, meiosis, closed mitosis with nuclear envelope remodeling |
| Disease relevance | Aneuploidy, cancer, oocyte maturation defects, infertility |
| Research methods | Live-cell imaging, CRISPR KO/point mutation/knock-in, overexpression, proteomics, screening |
What Is GO:0051983?
In our own words, GO:0051983 regulation of chromosome segregation refers to any biological process that controls the frequency, rate or extent of chromosome segregation. Chromosome segregation itself is the process in which sister chromatids or homologous chromosomes are separated and distributed to daughter cells during mitosis or meiosis. Regulation therefore includes processes that modulate spindle assembly and dynamics, kinetochore-microtubule attachments, cohesin and condensin function, motor protein activity, checkpoint signaling, and nuclear envelope remodeling that influence when and how chromosomes separate.
Why Is regulation of chromosome segregation Important in Cell Biology?
Regulation of chromosome segregation is fundamental to genome stability: even mild errors in this process generate aneuploid cells, which are a hallmark of human cancers and a leading cause of miscarriage and developmental disorders. Because chromosome segregation is executed by a large, druggable machinery of motors, kinases and cohesin regulators, understanding its regulation provides both mechanistic insight into cell division and potential therapeutic entry points.
• Prevents aneuploidy, a hallmark of many solid tumors and leukemias.
• Ensures faithful meiotic chromosome segregation, critical for fertility and oocyte quality.
• Coordinates spindle assembly, kinetochore attachments and checkpoint signaling.
• Controls chromosome condensation and sister chromatid cohesion, which are prerequisites for segregation.
• Regulates motor proteins such as kinesin-8 and dynein that position chromosomes and the spindle.
• Influences nuclear envelope dynamics during closed mitosis in fungi.
• Provides targets for anti-mitotic and anti-aneuploidy drug discovery.
• Enables CRISPR-based functional genomics of segregation regulators in human cells.
What Happens During regulation of chromosome segregation?
Spindle assembly and microtubule dynamics
In simple terms: The cell builds a microtubule spindle that will pull chromosomes apart, and its dynamics are tuned by motors and regulators.
Regulation of chromosome segregation begins with controlled spindle assembly and microtubule dynamics. Kinesin-8 motors regulate microtubule length and chromosome movements, thereby influencing the fidelity of segregation. Dynein contributes to spindle positioning, pole focusing and the removal of checkpoint proteins from kinetochores, all of which modulate when anaphase proceeds. In closed mitosis, nuclear envelope remodeling also affects chromosome segregation, as an excess of nuclear envelope alters the efficiency of segregation.
Cohesin and condensin control
In simple terms: Ring-shaped protein complexes hold sister chromatids together and compact chromosomes, and their regulation determines when separation occurs.
Cohesin complexes hold sister chromatids together until anaphase, and their regulation is essential for chromosome segregation. Acetylation of Rec8 cohesin complexes regulates reductional chromosome segregation in meiosis, providing a molecular switch that controls when homologs separate. Chromosome condensation, mediated by condensin and other factors, is also regulated to ensure that chromosomes are compact and mechanically stable during segregation.
Checkpoint surveillance and error correction
In simple terms: Quality-control checkpoints detect improper chromosome attachments and delay division until errors are fixed.
Regulation of chromosome segregation includes checkpoint pathways that monitor kinetochore-microtubule attachments and delay anaphase until errors are corrected. Dynein-mediated transport contributes to checkpoint silencing by removing checkpoint proteins from kinetochores. This surveillance ensures that chromosomes segregate with high fidelity and prevents aneuploidy.
Meiotic-specific regulation
In simple terms: In meiosis, special rules govern how homologous chromosomes and sister chromatids separate in two consecutive divisions.
Meiosis requires distinct regulation of chromosome segregation to achieve reductional and equational divisions. Fbxo30 regulates chromosome segregation during oocyte meiosis, and its loss affects meiotic progression. Rec8 cohesin acetylation controls reductional segregation, ensuring that homologs separate in meiosis I while sisters remain together until meiosis II. Chemical treatments such as reversine and proTAME alter chromosome segregation during mouse oocyte maturation, demonstrating that meiotic segregation is sensitive to small-molecule perturbation.
Bacterial chromosome partitioning as a parallel system
In simple terms: Bacteria also regulate chromosome segregation, using partitioning proteins that are controlled by phosphorylation.
Although mechanistically distinct, bacterial chromosome partitioning provides a parallel example of segregation regulation. The chromosome partitioning protein RocS is regulated by phosphorylation, and its molecular dissection has revealed how post-translational modification controls its function. This illustrates that regulation of chromosome segregation is an evolutionarily conserved theme across kingdoms.
Key Genes Involved in GO:0051983 regulation of chromosome segregation
The following genes and proteins are experimentally implicated in regulation of chromosome segregation, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KIF18A | Kinesin-8 motor regulating microtubule dynamics and chromosome movements | Target for studying mitotic spindle regulation and aneuploidy |
| KIF18B | Kinesin-8 family member controlling microtubule length | Model for motor-dependent segregation fidelity |
| DYNCH1 | Dynein heavy chain involved in spindle positioning and checkpoint silencing | Key node in dynein-mediated chromosome segregation |
| DYNLL1 | Dynein light chain contributing to dynein function | Component of dynein regulation in mitosis |
| REC8 | Meiotic cohesin subunit whose acetylation regulates reductional segregation | Central to meiotic chromosome segregation studies |
| FBXO30 | E3 ubiquitin ligase regulating oocyte meiotic chromosome segregation | Implicated in oocyte meiosis and female fertility |
| RocS | Bacterial chromosome partitioning protein regulated by phosphorylation | Model for phosphorylation-dependent segregation control |
| Condensin subunits (e.g., SMC2, SMC4) | Chromosome condensation and structural maintenance | Required for compaction during segregation |
| Cohesin subunits (e.g., SMC1, SMC3, RAD21) | Sister chromatid cohesion | Core machinery whose regulation determines segregation timing |
| Spindle checkpoint proteins (e.g., MAD2, BUB1) | Monitor kinetochore attachments and delay anaphase | Checkpoint regulation of segregation fidelity |
| Aurora kinases (e.g., AURKA, AURKB) | Regulate kinetochore-microtubule attachments and condensation | Key regulators of chromosome segregation |
| PLK1 | Polo-like kinase controlling mitotic progression | Regulates multiple steps of chromosome segregation |
| Separase (ESPL1) | Cleaves cohesin to trigger anaphase | Executioner of sister chromatid separation |
| Securin (PTTG1) | Inhibits separase until anaphase | Regulatory control of cohesin cleavage |
| Nucleoporins (e.g., NUP98) | Nuclear envelope remodeling in closed mitosis | Affects chromosome segregation under nuclear envelope excess |
| Reversine-sensitive targets (e.g., MPS1) | Chemical perturbation of segregation | Small-molecule probes of oocyte maturation |
| proTAME targets (APC/C) | Proteasome-dependent control of segregation | Chemical tool for meiotic segregation studies |
| RocS kinase (unknown) | Phosphorylation of RocS | Bacterial segregation regulation |
How Is regulation of chromosome segregation Regulated?
Regulation of chromosome segregation is itself regulated at multiple levels. Post-translational modification is a recurring theme: acetylation of Rec8 cohesin complexes controls reductional segregation in meiosis, and phosphorylation of the bacterial partitioning protein RocS regulates its function. Motor proteins such as kinesin-8 and dynein are regulated by cell-cycle kinases and by interactions with their cargo and adaptors, which tunes microtubule dynamics and checkpoint silencing. Checkpoint pathways provide temporal regulation by delaying anaphase until all chromosomes are properly attached. In closed mitosis, nuclear envelope dynamics add a spatial layer of regulation. Chemical probes such as reversine and proTAME can acutely perturb these regulatory circuits during oocyte maturation.
regulation of chromosome segregation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KIF18A | Aneuploidy and cancer | CRISPR knockout in cancer cell lines; live-cell imaging |
| REC8 | Meiotic aneuploidy and infertility | Knock-in of acetylation-deficient Rec8 in mouse oocytes |
| FBXO30 | Oocyte maturation defects | Oocyte-specific knockout mouse |
| DYNCH1 | Mitotic errors and cancer | Point-mutation knock-in of dynein mutants |
| RocS | Bacterial chromosome partitioning | Phospho-mutant knock-in in bacteria |
Cancer and aneuploidy
Errors in regulation of chromosome segregation produce aneuploidy, a hallmark of cancer. Dysregulation of motors such as kinesin-8 and dynein, as well as checkpoint and cohesin regulators, can promote chromosomal instability and tumor evolution. Because many segregation regulators are druggable enzymes or motors, they are actively explored as anti-cancer targets.
Oocyte maturation defects and infertility
Meiotic chromosome segregation is uniquely error-prone in human oocytes, and its misregulation contributes to aneuploid eggs, miscarriage and infertility. Fbxo30 regulates oocyte meiotic chromosome segregation, and its perturbation affects meiotic progression. Chemical treatments such as reversine and proTAME alter chromosome segregation during mouse oocyte maturation, providing models for studying meiotic errors. Rec8 cohesin acetylation is also critical for reductional segregation, linking cohesin regulation to meiotic fidelity.
Developmental disorders and nuclear envelope-related pathology
In closed mitosis, an excess of nuclear envelope impairs chromosome segregation, suggesting that nuclear envelope remodeling is important for genome stability. Defects in chromosome condensation and segregation have been linked to developmental abnormalities in model systems. Bacterial partitioning defects, while not human disease, inform conserved mechanisms of segregation regulation.
From regulation of chromosome segregation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate gene required for chromosome segregation? | CRISPR knockout cell line |
| Does a specific phosphorylation or acetylation site regulate segregation? | Point-mutation knock-in |
| Does a motor domain mutation alter microtubule dynamics? | Knock-in of mutant kinesin-8 |
| Where and when does a regulator localize during mitosis? | Tagged knock-in with fluorescent protein |
| Does overexpression of a regulator cause aneuploidy? | Doxycycline-inducible overexpression |
| Which genes modulate segregation in a genome-wide manner? | CRISPR library screening |
How to Study the regulation of chromosome segregation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Chromosome segregation dynamics and errors | Quantifying lagging chromosomes and anaphase bridges |
| CRISPR knockout | Gene requirement for segregation | Testing candidate regulators |
| Point-mutation knock-in | Site-specific regulatory modifications | Acetylation or phosphorylation site function |
| Overexpression | Gain-of-function effects on segregation | Inducing aneuploidy or segregation defects |
| CRISPR library screening | Genome-wide modifiers of segregation | Identifying novel regulators |
| Proteomics | Protein interactions and modifications | Mapping cohesin and motor regulation |
| Chemical perturbation | Acute effects on segregation machinery | Reversine and proTAME studies in oocytes |
| Fluorescent tagging | Subcellular localization and dynamics | Tracking kinetochore and spindle proteins |
Live-cell imaging of chromosome segregation
Live-cell imaging with fluorescently tagged histones, kinetochores and spindle markers allows direct visualization of chromosome segregation dynamics and the effects of regulatory perturbations. Time-lapse microscopy can quantify lagging chromosomes, anaphase bridges and segregation errors in real time.
CRISPR-based perturbation and screening
CRISPR knockout, point-mutation knock-in and overexpression enable causal testing of segregation regulators. Pooled CRISPR screens can identify genes whose loss alters chromosome segregation or aneuploidy. These approaches are complemented by chemical perturbation with reversine or proTAME to acutely modulate segregation.
Proteomics and post-translational modification analysis
Mass spectrometry-based proteomics can map acetylation and phosphorylation sites on cohesin and partitioning proteins, revealing regulatory modifications such as Rec8 acetylation and RocS phosphorylation. These datasets guide functional validation by point-mutation knock-in.
Genetic and chemical perturbation in model organisms
Mouse oocytes, yeast and bacteria provide tractable systems for studying regulation of chromosome segregation. Oocyte maturation assays with reversine and proTAME reveal meiotic-specific regulation, while bacterial RocS mutants illuminate phosphorylation-dependent partitioning. Closed mitosis models in fungi allow manipulation of nuclear envelope dynamics.
How CRISPR Can Be Used to Study GO:0051983 regulation of chromosome segregation
Knockout
CRISPR knockout of candidate genes such as KIF18A, FBXO30 or REC8 enables loss-of-function analysis of their roles in regulation of chromosome segregation. Knockout cell lines can be subjected to live-cell imaging and aneuploidy assays to quantify segregation defects.
Point Mutation
Point-mutation knock-in is used to test the function of specific regulatory residues, such as acetylation sites on Rec8 or phosphorylation sites on RocS. This approach distinguishes site-specific regulation from total loss of protein function.
Knock-in
Knock-in of fluorescent or epitope tags allows visualization and biochemical isolation of segregation regulators in their native context. Tagged knock-in models are valuable for tracking kinetochore and spindle proteins during mitosis and meiosis.
Overexpression
CRISPR-mediated overexpression or inducible expression of segregation regulators can reveal gain-of-function phenotypes, including aneuploidy and chromosome missegregation. Overexpression models complement knockout studies by testing sufficiency.
How EDITGENE Supports regulation of chromosome segregation Research
Researchers studying regulation of chromosome segregation-related genes often need to determine whether a candidate gene is causally involved in segregation fidelity, which regulatory residues matter, and how its perturbation affects aneuploidy and cell viability. EDITGENE provides validated CRISPR cell models and screening services to answer these questions efficiently and reproducibly.
Contact EDITGENE today to design your custom CRISPR model for regulation of chromosome segregation research.
Frequently Asked Questions About regulation of chromosome segregation
What is GO:0051983 regulation of chromosome segregation?
GO:0051983 is a Gene Ontology biological process term describing any process that modulates the frequency, rate or extent of chromosome segregation, the separation of sister chromatids or homologous chromosomes during cell division.
What genes are involved in regulation of chromosome segregation?
Key genes include kinesin-8 motors such as KIF18A, dynein components, cohesin subunits including REC8, FBXO30, condensin subunits, and checkpoint kinases.
How is chromosome segregation regulated during meiosis?
Meiotic segregation is regulated by cohesin acetylation, such as Rec8 acetylation, and by factors like Fbxo30, which control reductional versus equational division.
What happens when chromosome segregation is dysregulated?
Dysregulation causes aneuploidy, which is a hallmark of cancer and a cause of infertility and developmental defects.
Which motors regulate chromosome segregation?
Kinesin-8 motors regulate microtubule dynamics and chromosome movements, while dynein controls spindle positioning and checkpoint silencing.
How can I study regulation of chromosome segregation with CRISPR?
CRISPR knockout, point-mutation knock-in, tagged knock-in and overexpression models allow causal testing of segregation regulators, complemented by live-cell imaging and screening.
Is regulation of chromosome segregation conserved in bacteria?
Yes, bacteria regulate chromosome partitioning through proteins such as RocS, which is controlled by phosphorylation.
What diseases are linked to chromosome segregation defects?
Cancer, infertility, miscarriage and developmental disorders are linked to errors in chromosome segregation regulation.
What methods are used to measure chromosome segregation?
Live-cell imaging, CRISPR screening, proteomics and chemical perturbation with reversine or proTAME are commonly used.
Does the nuclear envelope affect chromosome segregation?
In closed mitosis, an excess of nuclear envelope impairs chromosome segregation, indicating that nuclear envelope remodeling is part of its regulation.
Conclusion
GO:0051983 regulation of chromosome segregation is a central biological process that ensures faithful genome inheritance by coordinating spindle dynamics, motor proteins, cohesin and condensin function, and checkpoint surveillance. Its dysregulation underlies aneuploidy, cancer and meiotic defects, making it a high-value area for mechanistic and translational research. CRISPR-based knockout, point-mutation, knock-in, overexpression and library screening approaches now enable systematic dissection of this process, and EDITGENE provides the tools and services to support such studies.
References
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- 3. Yonekura S et al.. 2025. Effects of reversine and proTAME treatment on chromosome segregation during mouse oocyte maturation.. Zygote 33(4):195-202 PMID: 40887771
- 4. Demuysere M et al.. 2024. Molecular dissection of the chromosome partitioning protein RocS and regulation by phosphorylation.. J Bacteriol 206(10):e0029124 PMID: 39315781
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- 6. McHugh B et al.. 2003. Regulation of chromosome condensation and segregation.. Curr Opin Genet Dev 13(2):185-90 PMID: 12672496
- 7. Raaijmakers JA et al.. 2014. Function and regulation of dynein in mitotic chromosome segregation.. Chromosoma 123(5):407-22 PMID: 24871939
- 8. Li Z et al.. 2024. Acetylation of Rec8 cohesin complexes regulates reductional chromosome segregation in meiosis.. Life Sci Alliance 7(6) PMID: 38575358
