GO:0071962 mitotic sister chromatid cohesion, centromeric: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071962 describes the cell cycle process in which centromeres of sister chromatids are joined during mitosis, ensuring accurate chromosome segregation.
• Centromeric cohesion is established during S phase and must be maintained until anaphase, when it is cleaved to allow sister chromatid separation.
• The cohesin complex, Shugoshin (SGO1/SGO2), Bub1, and PP2A are core regulators that protect centromeric cohesion from premature removal.
• Sororin and Wapl antagonistically control cohesin dynamics, with Sororin locking the DNA-exit gate to preserve cohesion.
• Loss of centromeric cohesion leads to chromosome missegregation, aneuploidy, and is implicated in cancer and developmental disorders.
• CRISPR-based knockout, point mutation, knock-in, and overexpression models enable precise dissection of centromeric cohesion genes in human cells.
Description
Mitotic sister chromatid cohesion, centromeric (GO:0071962) is the cell cycle process in which centromeres of sister chromatids are joined during mitosis. This process is essential for the faithful segregation of genetic material, as it counteracts the pulling forces of the mitotic spindle until anaphase onset. The centromeric region is a specialized chromatin domain where cohesion is particularly robust and tightly regulated to ensure that sister chromatids remain paired until every chromosome is properly bi-oriented. Defects in centromeric cohesion result in premature sister chromatid separation, chromosome missegregation, and aneuploidy, which are hallmarks of cancer and several developmental syndromes. Research into GO:0071962 has revealed a conserved molecular machinery centered on the cohesin complex, which forms a ring-like structure that topologically entraps sister DNA molecules. The centromeric pool of cohesin is specifically protected by Shugoshin proteins, which recruit protein phosphatase 2A (PP2A) to counteract the phosphorylation events that would otherwise remove cohesin. Additionally, factors such as Bub1, PHB2, and the Bloom syndrome helicase complex modulate the stability and dynamics of centromeric cohesion. Understanding these mechanisms is critical for deciphering how cells maintain genomic stability and how their failure contributes to disease. This article provides a comprehensive overview of GO:0071962, integrating the official QuickGO definition with mechanistic insights from real PubMed literature. We cover the key stages of centromeric cohesion, the major protein players, regulatory pathways, disease associations, and state-of-the-art research methods including CRISPR-based genome editing. The content is designed to serve as a resource for researchers seeking to study centromeric cohesion in health and disease.
mitotic sister chromatid cohesion, centromeric At A Glance
| GO ID | GO:0071962 |
|---|---|
| GO term | mitotic sister chromatid cohesion, centromeric |
| Ontology | biological_process |
| Synonym | centromeric mitotic sister chromatin cohesion; mitotic sister chromatid cohesion at centromere; sister chromatid cohesion at centromere at mitosis |
| Major function | Joining centromeres of sister chromatids during mitosis to ensure proper chromosome segregation |
| Related cellular component | Cohesin complex, centromere/kinetochore region |
| Key regulators | Shugoshin (SGO1/SGO2), Bub1, PP2A, Sororin, Wapl, PHB2 |
| Disease relevance | Aneuploidy, cancer, developmental disorders |
What Is GO:0071962?
GO:0071962, mitotic sister chromatid cohesion, centromeric, is defined as the cell cycle process in which centromeres of sister chromatids are joined during mitosis. This process ensures that sister chromatids remain physically connected at their centromeres from DNA replication until anaphase, when cohesion is cleaved to permit segregation. It is a specialized subprocess of sister chromatid cohesion that is restricted to the centromeric region and is essential for accurate chromosome segregation.
Why Is mitotic sister chromatid cohesion, centromeric Important in Cell Biology?
Centromeric cohesion is a fundamental safeguard for genomic integrity. It ensures that sister chromatids remain paired until the spindle assembly checkpoint is satisfied, preventing premature separation that would lead to aneuploidy. This process is particularly important in rapidly dividing cells, such as stem cells and cancer cells, where errors in chromosome segregation can drive tumorigenesis or developmental abnormalities. Moreover, centromeric cohesion is mechanistically distinct from arm cohesion, relying on specialized protectors like Shugoshin and PP2A, making it a unique target for understanding cell cycle regulation and for therapeutic intervention.
• Prevents premature sister chromatid separation, a major cause of aneuploidy.
• Ensures accurate chromosome segregation during mitosis, maintaining genomic stability.
• Dysregulation is linked to cancer, including colorectal and breast cancers.
• Mutations in cohesion genes cause developmental disorders such as Cornelia de Lange syndrome.
• Centromeric cohesion is a target for anticancer drugs that induce mitotic catastrophe.
• Provides a model for studying protein phosphatase regulation and kinetochore signaling.
• Involved in the DNA damage response and cell cycle checkpoints.
• Key for understanding stem cell self-renewal and tissue homeostasis.
• Offers insights into meiosis, where centromeric cohesion is differentially regulated.
• Enables CRISPR-based functional genomics of chromosome segregation.
What Happens During mitotic sister chromatid cohesion, centromeric?
Establishment of Centromeric Cohesion
In simple terms: During DNA replication, the cohesin ring is loaded onto sister chromatids and specifically enriched at centromeres.
Centromeric cohesion is established during S phase when the cohesin complex is loaded onto chromatin and becomes acetylated to lock the ring around sister DNA molecules. The centromeric region recruits additional cohesin through mechanisms involving the centromere-specific histone H3 variant CENP-A and other kinetochore proteins. This establishment ensures that sister chromatids are paired at their centromeres immediately after replication.
Protection by Shugoshin and PP2A
In simple terms: Shugoshin proteins act as bodyguards that recruit PP2A to keep cohesin at centromeres protected from removal.
During prophase and prometaphase, the bulk of cohesin is removed from chromosome arms by the Wapl-Pds5 pathway, but centromeric cohesin is protected by Shugoshin (SGO1 in mitosis). Shugoshin recruits protein phosphatase 2A (PP2A) to centromeres, which dephosphorylates cohesin subunits and counteracts the phosphorylation that would otherwise lead to cohesin release. Bub1 kinase is required for centromeric localization of Shugoshin and thus for protection. Structural studies have revealed how Shugoshin and PP2A interact to shield cohesin from Wapl-mediated removal.
Role of Sororin and Wapl in Cohesin Dynamics
In simple terms: Sororin locks the cohesin ring, while Wapl tries to open it; their balance determines cohesion stability.
Sororin is a key protein that binds to cohesin and locks its DNA-exit gate, thereby preserving sister chromatid cohesion. Wapl, on the other hand, promotes cohesin release by interacting with the cohesin complex and opening the gate. The antagonistic relationship between Sororin and Wapl is critical for maintaining centromeric cohesion until anaphase. Recent structural and biochemical studies have elucidated how Sororin competes with Wapl to stabilize the cohesin ring.
Cleavage at Anaphase and Sister Chromatid Separation
In simple terms: At anaphase, a protease called separase cuts cohesin, allowing sister chromatids to be pulled apart.
Once all chromosomes are properly attached to the spindle, the anaphase-promoting complex/cyclosome (APC/C) triggers degradation of securin, releasing separase. Separase cleaves the Scc1/Rad21 subunit of cohesin, opening the ring and allowing sister chromatids to separate. Centromeric cohesion must be maintained until this point; premature cleavage leads to chromosome missegregation. The Bloom syndrome helicase complex is also involved in centromere protection, and its inactivation is required for proper mitosis.
Key Genes Involved in GO:0071962 mitotic sister chromatid cohesion, centromeric
The following genes and proteins are central to centromeric sister chromatid cohesion, as supported by the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SGO1 | Shugoshin 1; protects centromeric cohesin by recruiting PP2A | Knockout causes premature centromeric cohesion loss; cancer drug target |
| SGO2 | Shugoshin 2; meiosis-specific protector of centromeric cohesion | Meiotic cohesion studies; knockout models |
| BUB1 | Kinase required for Shugoshin centromeric localization | Knockout leads to cohesion defects; checkpoint studies |
| PPP2CA | Catalytic subunit of PP2A; dephosphorylates cohesin | Point mutations to dissect phosphatase activity |
| RAD21 | Cohesin subunit cleaved by separase | Knockout is lethal; conditional models for cohesion |
| SMC1A | Cohesin subunit; mutations cause Cornelia de Lange syndrome | Patient-derived mutations; knock-in models |
| SMC3 | Cohesin subunit; acetylated to stabilize ring | Acetylation mutants; overexpression studies |
| WAPL | Promotes cohesin release; antagonizes Sororin | Knockout increases cohesion; interaction studies |
| SORORIN | Locks cohesin DNA-exit gate; protects cohesion | Knockout causes cohesion loss; structural studies |
| PHB2 | Protects sister chromatid cohesion in mitosis | Knockout leads to cohesion defects; cancer relevance |
| BLM | Bloom syndrome helicase; complex inactivated for centromere protection | Knockout causes cohesion abnormalities; cancer predisposition |
| MEI-S332 | Drosophila Shugoshin; centromeric cohesion protector | Genetic models of cohesion |
| PDS5 | Cohesin accessory factor; regulates Wapl | Knockout affects cohesion dynamics |
| ESCO1 | Acetyltransferase for cohesin | Overexpression increases cohesion |
| SEPARASE | Cleaves cohesin at anaphase | Point mutations to block cleavage |
| SECURIN | Inhibits separase until anaphase | Knockout causes premature separation |
| APC/C | Ubiquitin ligase that degrades securin | Knockout arrests mitosis |
| CENP-A | Centromere-specific histone; marks centromere | Knock-in for centromere tagging |
How Is mitotic sister chromatid cohesion, centromeric Regulated?
Centromeric cohesion is regulated by phosphorylation and dephosphorylation events. Bub1 kinase phosphorylates histone H2A at centromeres, which recruits Shugoshin and PP2A. PP2A then dephosphorylates cohesin subunits, protecting them from Wapl-mediated removal. Sororin is also regulated by phosphorylation; its dephosphorylation by PP2A enhances its binding to cohesin. The Bloom syndrome helicase complex must be inactivated during mitosis to prevent premature centromere resolution. Additionally, the APC/C controls separase activation, ensuring that cohesion cleavage occurs only after all chromosomes are properly aligned.
mitotic sister chromatid cohesion, centromeric and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SGO1 | Cancer, aneuploidy | Knockout in HeLa cells; overexpression in cancer lines |
| SMC1A | Cornelia de Lange syndrome | Patient-derived iPSCs; knock-in mutations |
| BLM | Bloom syndrome | Knockout fibroblasts; complementation with wild-type |
| RAD21 | Colorectal cancer | Conditional knockout in mouse models |
| PHB2 | Cancer progression | Knockout in cancer cell lines; xenografts |
Cancer and Aneuploidy
Defects in centromeric cohesion lead to chromosome missegregation and aneuploidy, a hallmark of many cancers. Overexpression of Shugoshin or loss of Wapl can cause cohesion defects that promote tumorigenesis. Mutations in cohesin subunits such as SMC1A and RAD21 are found in colorectal cancer and other malignancies. Targeting centromeric cohesion proteins is a potential anticancer strategy, as cancer cells may be more sensitive to cohesion disruption.
Developmental Disorders (Cohesinopathies)
Mutations in cohesin complex genes cause Cornelia de Lange syndrome and Roberts syndrome, characterized by developmental abnormalities. These mutations often affect centromeric cohesion, leading to mitotic errors in stem cells and impaired tissue development. Understanding how these mutations impact centromeric cohesion is crucial for developing therapeutic approaches.
Bloom Syndrome
Bloom syndrome is caused by mutations in the BLM helicase, which is involved in centromere protection. Loss of BLM leads to increased sister chromatid exchange and cohesion defects, predisposing to cancer. Recent studies show that strict mitotic inactivation of the Bloom syndrome helicase complex is required for centromere protection.
From mitotic sister chromatid cohesion, centromeric-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SGO1 knockout cause premature centromeric cohesion loss? | CRISPR knockout in HeLa or RPE1 cells |
| How do point mutations in RAD21 affect separase cleavage? | Knock-in of mutant RAD21 in human cells |
| Can overexpression of Sororin rescue cohesion defects? | Overexpression of SORORIN in Wapl-depleted cells |
| What is the role of BLM in centromere protection? | Knockout of BLM in fibroblasts |
| Does Bub1 kinase activity regulate Shugoshin localization? | Point mutation of BUB1 kinase domain |
| How does PHB2 protect cohesion? | Knockout and rescue with tagged PHB2 |
How to Study the mitotic sister chromatid cohesion, centromeric Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Dynamics of sister centromere separation | Real-time cohesion analysis |
| Chromosome spreads + FISH | Distance between sister centromeres | Cohesion defect quantification |
| Co-IP + mass spectrometry | Protein-protein interactions | Identifying cohesin regulators |
| CRISPR knockout screens | Gene essentiality for cohesion | Discovery of novel cohesion factors |
| Western blot | Protein expression and phosphorylation | Validating knockout/overexpression |
| Immunofluorescence | Centromeric localization of proteins | Assessing Shugoshin recruitment |
| RNA-seq | Transcriptional changes upon cohesion disruption | Pathway analysis |
| Proximity ligation assay | In situ protein interactions | Detecting Sororin-cohesin binding |
Live-Cell Imaging of Chromosome Segregation
Live-cell imaging using fluorescently tagged histones or centromere proteins allows real-time visualization of sister chromatid cohesion and separation. This method can quantify the timing of centromere splitting and detect premature separation in mutant cells.
Chromosome Spreads and FISH
Chromosome spreads combined with fluorescence in situ hybridization (FISH) can assess centromeric cohesion by measuring the distance between sister centromeres. This technique is useful for evaluating cohesion defects in knockout or mutant cell lines.
Proteomics and Co-Immunoprecipitation
Co-immunoprecipitation followed by mass spectrometry can identify interacting partners of cohesin and its regulators, such as Shugoshin and PP2A. This approach helps map the centromeric cohesion interactome.
CRISPR-Based Functional Genomics
Genome-wide CRISPR knockout screens can identify genes required for centromeric cohesion, using viability or chromosome missegregation as readouts. Such screens have uncovered novel regulators and potential drug targets.
How CRISPR Can Be Used to Study GO:0071962 mitotic sister chromatid cohesion, centromeric
Knockout
CRISPR knockout of genes such as SGO1, BUB1, or WAPL in human cell lines is a powerful approach to study centromeric cohesion. Knockout cells can be analyzed for premature sister chromatid separation, aneuploidy, and cell cycle arrest. For essential genes like RAD21, conditional knockout or degron systems are recommended.
Point Mutation
Introducing point mutations via CRISPR base editing or homology-directed repair allows precise dissection of phosphorylation sites or catalytic residues. For example, mutating the Bub1 kinase domain can reveal its role in Shugoshin recruitment. Point mutations in PP2A subunits can clarify dephosphorylation targets.
Knock-in
Knock-in of fluorescent tags (e.g., GFP, mCherry) at endogenous loci enables live-cell imaging of centromeric proteins. Tagged knock-in of SGO1 or Sororin allows tracking of their localization and dynamics during mitosis. This approach preserves endogenous regulation and expression levels.
Overexpression
Overexpression of cohesion protectors such as Sororin or Shugoshin can rescue cohesion defects or induce hyper-cohesion. Conversely, overexpression of Wapl promotes cohesin release and can cause premature separation. Overexpression studies help establish sufficiency and dominance of specific factors.
How EDITGENE Supports mitotic sister chromatid cohesion, centromeric Research
Researchers studying mitotic sister chromatid cohesion, centromeric-related genes often need to determine whether a candidate gene is causally involved in cohesion maintenance, chromosome segregation, or disease progression. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from gene knockout to precise point mutations and library screening.
Contact EDITGENE today to design your custom CRISPR model for mitotic sister chromatid cohesion, centromeric research.
Frequently Asked Questions About mitotic sister chromatid cohesion, centromeric
What is GO:0071962?
GO:0071962 is the Gene Ontology term for mitotic sister chromatid cohesion, centromeric, the process in which centromeres of sister chromatids are joined during mitosis.
What genes are involved in centromeric sister chromatid cohesion?
Key genes include SGO1, SGO2, BUB1, PPP2CA, RAD21, SMC1A, SMC3, WAPL, SORORIN, PHB2, and BLM.
How is centromeric cohesion protected during mitosis?
Shugoshin recruits PP2A to centromeres, which dephosphorylates cohesin and protects it from Wapl-mediated removal.
What happens if centromeric cohesion is lost?
Loss of centromeric cohesion leads to premature sister chromatid separation, chromosome missegregation, and aneuploidy, which can cause cancer and developmental disorders.
What is the role of Sororin in cohesion?
Sororin locks the DNA-exit gate of cohesin, preserving sister chromatid cohesion.
How does Wapl regulate cohesion?
Wapl promotes cohesin release by opening the DNA-exit gate, antagonizing Sororin.
What is the role of Bub1 in centromeric cohesion?
Bub1 kinase is required for centromeric localization of Shugoshin, thereby protecting cohesion.
How can I study centromeric cohesion using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models allow functional dissection of cohesion genes.
What diseases are associated with centromeric cohesion defects?
Cancer, aneuploidy, Cornelia de Lange syndrome, and Bloom syndrome are linked to cohesion defects.
What methods are used to measure centromeric cohesion?
Live-cell imaging, chromosome spreads with FISH, and immunofluorescence are common methods.
Conclusion
Mitotic sister chromatid cohesion, centromeric (GO:0071962) is a tightly regulated process essential for genomic stability. The interplay between cohesin, Shugoshin, PP2A, Sororin, and Wapl ensures that sister centromeres remain paired until anaphase. Disruption of this process leads to aneuploidy and diseases such as cancer and cohesinopathies. Continued research using CRISPR-based models will further elucidate the molecular details and therapeutic potential of targeting centromeric cohesion.
References
- 1. Zheng G et al.. 2015. Regulation of sister chromatid cohesion during the mitotic cell cycle.. Sci China Life Sci 58(11):1089-98 PMID: 26511516
- 2. Tang Z et al.. 2004. Human Bub1 protects centromeric sister-chromatid cohesion through Shugoshin during mitosis.. Proc Natl Acad Sci U S A 101(52):18012-7 PMID: 15604152
- 3. Chen Q et al.. 2026. Sororin locks the DNA-exit gate of cohesin to preserve sister-chromatid cohesion.. Nat Commun 17(1) PMID: 41807408
- 4. Yuan X et al.. 2024. Molecular mechanism and functional significance of Wapl interaction with the Cohesin complex.. Proc Natl Acad Sci U S A 121(33):e2405177121 PMID: 39110738
- 5. Takata H et al.. 2007. PHB2 protects sister-chromatid cohesion in mitosis.. Curr Biol 17(15):1356-61 PMID: 17656096
- 6. LeBlanc HN et al.. 1999. The mitotic centromeric protein MEI-S332 and its role in sister-chromatid cohesion.. Chromosoma 108(7):401-11 PMID: 10654079
- 7. García-Nieto A et al.. 2023. Structural basis of centromeric cohesion protection.. Nat Struct Mol Biol 30(6):853-859 PMID: 37081319
- 8. Fernández-Casañas M et al.. 2025. Centromere protection requires strict mitotic inactivation of the Bloom syndrome helicase complex.. Nat Commun 16(1):7832 PMID: 40846865
