GO:0000775 chromosome, centromeric region: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0000775 defines the centromeric region of a chromosome, encompassing centromeric DNA and its associated proteins.
• Centromeres are essential for faithful chromosome segregation and genome stability.
• Centromeric DNA is characterized by repetitive sequences and epigenetic marks such as CENP-A.
• Dysregulation of centromeric regions is linked to cancer, infertility, and developmental disorders.
• Advanced techniques like CRISPR screening and ChIP-seq enable functional dissection of centromeric components.
• EDITGENE offers tailored CRISPR services to model centromere-related genes and mutations.
Description
The centromeric region of a chromosome, defined by the Gene Ontology term GO:0000775, is a specialized chromatin domain that ensures accurate chromosome segregation during cell division. It comprises centromeric DNA and a complex of associated proteins, including histone H3 variant CENP-A and kinetochore components. This region is critical for maintaining genomic integrity, and its dysfunction is implicated in various human diseases, including cancer and infertility. Understanding the molecular architecture and regulation of the centromeric region is therefore a fundamental goal in cell biology and genomics. Recent advances in sequencing and genome editing have provided unprecedented insights into centromere organization and function.
chromosome, centromeric region At A Glance
| GO ID | GO:0000775 |
|---|---|
| GO term | chromosome, centromeric region |
| Ontology | cellular_component |
| Synonym | centromere, centromere complex, chromosome, centric region, chromosome, pericentric region |
| Major function | Chromosome segregation and kinetochore assembly |
| Definition | The region of a chromosome that includes the centromeric DNA and associated proteins. |
| Related processes | Mitosis, meiosis, chromosome segregation |
| Key proteins | CENP-A, CENP-B, CENP-C, kinetochore proteins |
What Is GO:0000775?
GO:0000775 describes the region of a chromosome that includes the centromeric DNA and its associated proteins. In monocentric chromosomes, this region is a single localized area, whereas in holocentric chromosomes, it is distributed along the entire chromosome length. This definition encompasses both the DNA sequences and the protein machinery that assemble into a functional centromere, which serves as the attachment site for spindle fibers during mitosis and meiosis.
Why Is chromosome, centromeric region Important in Cell Biology?
The centromeric region is indispensable for genome stability, as it ensures the equal distribution of genetic material to daughter cells during cell division. Errors in centromere function lead to aneuploidy, a hallmark of cancer and developmental disorders. Moreover, centromeric regions are hotspots for chromosomal rearrangements and are implicated in conditions such as polycystic ovary syndrome and infertility. Studying this region is therefore crucial for understanding basic chromosome biology and for developing therapeutic strategies targeting genomic instability.
• Ensures accurate chromosome segregation during mitosis and meiosis.
• Prevents aneuploidy, a common feature of cancer cells.
• Centromeric DNA repeats and proteins are involved in meiotic drive and reproductive disorders.
• Serves as a platform for kinetochore assembly and spindle attachment.
• Centromere dysfunction is linked to infertility and pregnancy loss.
• Provides targets for cancer therapeutics aimed at chromosomal instability.
• Centromeric patterns are chromosome-specific and can be used for genome mapping.
• Epigenetic regulation of centromeres influences gene expression and chromatin structure.
• Centromeric regions are involved in gross chromosomal rearrangements.
• Understanding centromere biology aids in synthetic chromosome design and gene therapy.
What Happens During chromosome, centromeric region?
Centromere Specification and Assembly
In simple terms: The centromere is marked by a special histone protein that tells the cell where to build the kinetochore.
Centromere identity is epigenetically defined by the histone H3 variant CENP-A, which replaces H3 in centromeric nucleosomes. CENP-A deposition is cell-cycle regulated and requires the chaperone HJURP. This mark recruits other centromere proteins, including CENP-B, CENP-C, and CENP-T, forming the inner centromere.
Kinetochore Formation
In simple terms: The kinetochore is a protein machine that attaches chromosomes to the spindle fibers.
The inner centromere proteins recruit kinetochore components, such as NDC80 complex, which directly bind to microtubules. Phosphorylation by Aurora B kinase regulates kinetochore-microtubule attachments and error correction. This ensures proper chromosome bi-orientation and segregation.
Centromeric Cohesion and Segregation
In simple terms: Sister chromatids are held together at the centromere until it is time to separate.
Cohesin complexes enriched at the centromere mediate sister chromatid cohesion. Separase cleaves cohesin at anaphase, allowing sister chromatids to segregate to opposite poles. Defects in this process lead to aneuploidy and chromosomal instability.
Centromeric DNA Replication and Timing
In simple terms: Centromeric DNA replicates at a specific time during the cell cycle to ensure proper assembly.
Centromeric regions often replicate late in S phase, which may contribute to their unique chromatin state. Replication timing is regulated by chromatin context and can influence centromere function. Disruption of replication timing can lead to centromeric rearrangements.
Key Genes Involved in GO:0000775 chromosome, centromeric region
The following genes and proteins are key players in the structure and function of the chromosome, centromeric region.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CENPA | Histone H3 variant, marks active centromeres | Epigenetic marker; knockout causes mitotic defects |
| CENPB | Binds CENP-B box in centromeric DNA | Involved in centromere organization; knockout viable but affects fertility |
| CENPC | Inner kinetochore protein, links CENP-A to kinetochore | Essential for kinetochore assembly; knockout is lethal |
| NDC80 | Kinetochore component, binds microtubules | Direct role in chromosome segregation; mutations cause aneuploidy |
| AURKB | Aurora kinase B, regulates kinetochore-microtubule attachments | Phospho-regulation of kinetochore; inhibitor studies |
| HJURP | Chaperone for CENP-A deposition | Regulates centromere identity; overexpression causes ectopic centromeres |
| KNL1 | Kinetochore scaffold protein | Spindle assembly checkpoint; mutations linked to cancer |
| MIS12 | Kinetochore protein complex | Essential for chromosome segregation |
| SEPARASE | Cleaves cohesin at anaphase | Regulates sister chromatid separation |
| COHESIN | Holds sister chromatids together | Centromeric cohesion; mutations cause cohesinopathies |
| CENPT | Inner kinetochore protein | Links centromere to kinetochore |
| CENPW | Centromere protein W | Part of kinetochore; role in mitosis |
| BUB1 | Spindle checkpoint kinase | Monitors kinetochore attachment |
| MAD2 | Spindle checkpoint protein | Prevents anaphase until all chromosomes attached |
| TTK | Mps1 kinase, regulates checkpoint | Phospho-regulation of kinetochore |
| PLK1 | Polo-like kinase 1, regulates mitosis | Centromere assembly and checkpoint |
| CENPE | Kinesin motor protein | Chromosome congression; mutations cause cancer |
| INCENP | Chromosomal passenger complex | Regulates Aurora B activity |
How Is chromosome, centromeric region Regulated?
The centromeric region is regulated at multiple levels, including epigenetic marking by CENP-A, cell-cycle-dependent phosphorylation by Aurora B and other kinases, and replication timing. CENP-A deposition is tightly coupled to the cell cycle and requires HJURP. Phosphorylation of kinetochore proteins by Aurora B, Mps1, and Plk1 controls microtubule attachment and spindle checkpoint signaling. Additionally, centromeric DNA replication timing is regulated and may influence centromere function.
chromosome, centromeric region and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CENPA | Cancer, aneuploidy | Knockout and overexpression cell lines |
| AURKB | Cancer, mitotic defects | Point mutation and inhibitor studies |
| COHESIN | Cornelia de Lange syndrome | Knock-in of patient mutations |
| CENPE | Cancer, developmental disorders | Knockout and point mutation models |
| X centromere | Polycystic ovary syndrome | Knock-in of pericentromeric variants |
Cancer and Aneuploidy
Centromere dysfunction leads to chromosome missegregation and aneuploidy, a hallmark of many cancers. Overexpression of CENP-A and other centromere proteins is observed in various tumors and correlates with poor prognosis. Targeting centromere-associated kinases such as Aurora B is a therapeutic strategy in clinical trials.
Reproductive Disorders and Infertility
Centromeric drive on the X chromosome has been proposed to explain the prevalence of polycystic ovary syndrome (PCOS) and other conditions. Abnormal centromere function can cause meiotic errors, leading to infertility and miscarriage.
Developmental Disorders
Mutations in kinetochore and centromere proteins cause developmental disorders such as microcephaly and primordial dwarfism. Cohesinopathies, such as Cornelia de Lange syndrome, result from mutations in cohesin complex components that affect centromeric cohesion.
From chromosome, centromeric region-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does CENP-A overexpression cause ectopic centromeres? | Overexpression cell model |
| What is the effect of CENP-A knockout on mitosis? | Knockout cell model |
| How do Aurora B point mutations affect kinetochore function? | Point mutation knock-in |
| Can we tag CENP-C to visualize kinetochores? | Tagged knock-in |
| What is the role of centromeric cohesion in aneuploidy? | Knockout of cohesin subunits |
| How do pericentromeric variants affect PCOS risk? | Knock-in of risk alleles |
How to Study the chromosome, centromeric region Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Protein-DNA interactions | Mapping CENP-A and centromere proteins |
| CRISPR screen | Gene essentiality and function | Identifying centromere regulators |
| Live-cell imaging | Protein dynamics and chromosome movement | Kinetochore tracking |
| Mass spectrometry | Protein-protein interactions | Centromere complex composition |
| Replication timing assay | DNA replication timing | Centromeric replication |
| FISH | Chromosome structure and rearrangements | Centromeric rearrangements |
| Phospho-proteomics | Kinase substrates | Aurora B signaling |
Genomic and Epigenomic Profiling
ChIP-seq for CENP-A and other centromere proteins identifies centromeric chromatin domains. Centromeric patterns can be mapped using chromosome-specific approaches. These methods reveal the epigenetic landscape of centromeres.
Imaging and Live-Cell Analysis
Fluorescence microscopy of tagged centromere proteins allows visualization of kinetochore dynamics. Live-cell imaging can track chromosome segregation errors in real time.
CRISPR Screening and Functional Genomics
Genome-wide CRISPR screens can identify genes required for centromere function and chromosome segregation. Pooled screens with centromere-specific reporters enable high-throughput discovery.
Proteomics and Interaction Studies
Affinity purification coupled with mass spectrometry identifies centromere protein complexes. Proximity labeling can map kinetochore interactomes.
How CRISPR Can Be Used to Study GO:0000775 chromosome, centromeric region
Knockout
CRISPR knockout of centromere genes such as CENPA or CENPC disrupts centromere function and causes mitotic defects. These models are valuable for studying essentiality and identifying compensatory pathways.
Point Mutation
Introducing point mutations in kinetochore genes (e.g., AURKB) allows dissection of phosphorylation-dependent functions. Such models mimic patient mutations and reveal mechanistic insights.
Knock-in
Knock-in of tagged centromere proteins (e.g., GFP-CENPA) enables live-cell imaging and proteomic studies. Knock-in of disease-associated variants helps model human conditions.
Overexpression
Overexpression of CENP-A or HJURP can induce ectopic centromere formation and aneuploidy. These models are useful for studying centromere plasticity and cancer.
How EDITGENE Supports chromosome, centromeric region Research
Researchers studying chromosome, centromeric region-related genes often need to determine whether a candidate gene is causally involved in centromere function and disease. EDITGENE provides comprehensive CRISPR-based services to create precise cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for chromosome, centromeric region research.
Frequently Asked Questions About chromosome, centromeric region
What is the chromosome, centromeric region (GO:0000775)?
It is the region of a chromosome that includes centromeric DNA and associated proteins, essential for chromosome segregation.
What genes are involved in the centromeric region?
Key genes include CENPA, CENPB, CENPC, NDC80, AURKB, and others listed in the key genes table.
What diseases are associated with centromere dysfunction?
Cancer, aneuploidy, infertility, PCOS, and developmental disorders.
How can I study centromere function using CRISPR?
Use knockout, point mutation, knock-in, or overexpression models to dissect gene function.
What is the role of CENP-A in the centromere?
CENP-A is a histone H3 variant that epigenetically marks active centromeres.
How is the centromere regulated during the cell cycle?
Through phosphorylation by Aurora B, Plk1, and other kinases, and via CENP-A deposition timing.
What methods are used to analyze centromeric regions?
ChIP-seq, CRISPR screens, live-cell imaging, and proteomics.
Can centromere proteins be targeted for cancer therapy?
Yes, inhibitors of Aurora B and other mitotic kinases are in clinical trials.
What is the difference between monocentric and holocentric centromeres?
Monocentric centromeres are localized to a single region, while holocentric centromeres are distributed along the chromosome.
How does EDITGENE support centromere research?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services.
Conclusion
The chromosome, centromeric region (GO:0000775) is a fundamental cellular component that ensures genome stability through accurate chromosome segregation. Its dysfunction is linked to cancer, infertility, and developmental disorders, making it a critical area of research. Advances in CRISPR-based models and genomic technologies continue to unravel the complexities of centromere biology, offering new avenues for therapeutic intervention.
References
- 1. Moore T. 2024. X centromeric drive may explain the prevalence of polycystic ovary syndrome and other conditions: Genomic structure of the human X chromosome pericentromeric region is consistent with meiotic drive associated with PCOS and other conditions.. Bioessays 46(9):e2400056 PMID: 39072829
- 2. Corda L et al.. 2025. Chromosome-specific centromeric patterns define the centeny map of the human genome.. Science 389(6755):eads3484 PMID: 40608920
- 4. Xu R et al.. 2023. Gross Chromosomal Rearrangement at Centromeres.. Biomolecules 14(1) PMID: 38254628
- 5. Talbert PB et al.. 2020. What makes a centromere?. Exp Cell Res 389(2):111895 PMID: 32035948
- 6. Klemm C et al.. 2021. Cell-cycle phospho-regulation of the kinetochore.. Curr Genet 67(2):177-193 PMID: 33221975
- 7. Watanabe Y et al.. 2012. Replication timing in a single human chromosome 11 transferred into the Chinese hamster ovary (CHO) cell line.. Gene 510(1):1-6 PMID: 22964274
