GO:0034506 chromosome, centromeric core domain: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034506 describes the innermost core of the centromere, where CENP-A nucleosomes and their binding proteins form the foundation for kinetochore assembly.
• The core centromeric nucleosome complex contains CENP-A, CENP-B, CENP-C, and other proteins that create a specialized chromatin environment essential for chromosome segregation.
• CENP-A mislocalization and defects in histone supply chains can cause chromosomal instability, highlighting the importance of core domain integrity.
• Centromere organization is influenced by electrostatic repulsion and higher-order chromatin folding, as shown by recent biophysical models.
• The centromeric core domain is evolutionarily conserved but varies across species, including equids and C. elegans, reflecting adaptation.
• Studying this domain requires advanced methods such as CRISPR knockout, knock-in of tagged CENP-A, and high-resolution imaging.
Description
The centromere is the chromosomal region that ensures accurate chromosome segregation during cell division. At its heart lies the centromeric core domain, defined by GO:0034506 as the innermost portion of the centromeric region, encompassing the core region and the proteins that bind to it. This domain is essential for assembling the kinetochore, the protein machine that attaches chromosomes to spindle microtubules. Research has shown that the core centromeric nucleosome complex, containing CENP-A and other proteins, forms a specialized chromatin structure critical for centromere identity and function. Defects in this domain can lead to chromosomal instability, aneuploidy, and diseases such as cancer. Understanding the molecular composition and regulation of the centromeric core domain is therefore a fundamental goal in chromosome biology. Recent studies have revealed that proteins like CDCA7 act as hemimethylated DNA sensors that influence centromeric chromatin, while DNAJC9 maintains histone supply fidelity to prevent CENP-A mislocalization. Moreover, the organization of the centromere is governed by electrostatic repulsion and higher-order folding, as proposed in recent models. These findings underscore the dynamic and tightly regulated nature of the centromeric core domain. In this article, we synthesize current knowledge on the components, assembly, and research methods related to GO:0034506, providing a resource for researchers studying chromosome segregation and related diseases.
chromosome, centromeric core domain At A Glance
| GO ID | GO:0034506 |
|---|---|
| GO term | chromosome, centromeric core domain |
| Ontology | cellular_component |
| Synonym | chromosome, centric core region; chromosome, centromeric core region |
| Major function | Provides a structural platform for kinetochore assembly and chromosome segregation |
| Key components | CENP-A, CENP-B, CENP-C, and other centromeric proteins |
| Associated processes | Chromosome segregation, centromere organization, histone supply |
| Evolutionary conservation | Conserved but variable across species such as equids and C. elegans |
What Is GO:0034506?
GO:0034506, chromosome, centromeric core domain, refers to the innermost portion of the centromeric region of a chromosome. It includes the core region of the centromere and the proteins that bind to it, forming a specialized chromatin domain that serves as the foundation for kinetochore assembly and chromosome segregation.
Why Is chromosome, centromeric core domain Important in Cell Biology?
The centromeric core domain is critical for faithful chromosome segregation, and its dysfunction leads to aneuploidy, chromosomal instability, and diseases including cancer and developmental disorders. Understanding its composition and regulation provides insights into fundamental chromosome biology and potential therapeutic targets.
• Ensures accurate chromosome segregation during mitosis and meiosis.
• Defects cause chromosomal instability and aneuploidy, hallmarks of cancer.
• CENP-A mislocalization is linked to centromere dysfunction and disease.
• Core domain proteins are potential targets for cancer therapeutics.
• Evolutionary studies reveal conserved and species-specific centromere features.
• Electrostatic interactions govern centromere organization and function.
• Hemimethylated DNA sensors like CDCA7 influence centromeric chromatin.
• Histone supply chains maintain CENP-A fidelity and genome stability.
• Core domain assembly is essential for meiosis and fertility.
• Research tools like CRISPR enable functional dissection of centromeric components.
Core Domain of the Centromere: Assembly and Function
What Happens During chromosome, centromeric core domain Assembly?
In simple terms: The centromeric core domain is built by loading special proteins onto DNA to form a foundation for chromosome separation.
Assembly begins with the deposition of CENP-A, a histone H3 variant, into nucleosomes at the centromere. This process requires chaperones and is regulated by histone supply chains; DNAJC9 ensures fidelity of histone supply to prevent CENP-A mislocalization. The core centromeric nucleosome complex includes CENP-A, CENP-B, CENP-C, and other proteins that together form a stable structure. CDCA7, a hemimethylated DNA sensor, contributes to centromeric chromatin organization by recognizing specific DNA modifications. Electrostatic repulsion between nucleosomes and higher-order folding further shape the core domain architecture. In meiosis, CENP-A and KNL-2/M18BP1 regulate outer kinetochore assembly, ensuring proper chromosome segregation.
Structure and Composition of chromosome, centromeric core domain
In simple terms: The core domain is made of a special nucleosome containing CENP-A and several binding proteins that together form a compact structure.
The core centromeric nucleosome complex is a specialized chromatin particle containing CENP-A, CENP-B, CENP-C, and additional factors. CENP-A replaces histone H3 in centromeric nucleosomes, creating a unique epigenetic mark. CENP-B binds to the CENP-B box in centromeric DNA, while CENP-C connects the nucleosome to the kinetochore. Other proteins such as CENP-N, CENP-T, and CENP-W contribute to the inner kinetochore plate. The structure is further stabilized by electrostatic interactions and may adopt a higher-order folded conformation. Evolutionary studies in equids show that CENP-A and centromere composition can vary, reflecting adaptation. In C. elegans, KNL-2/M18BP1 is essential for centromere assembly during meiosis.
Molecular Mechanism of chromosome, centromeric core domain
In simple terms: The core domain works by recognizing specific DNA marks and assembling proteins that pull chromosomes apart.
The molecular mechanism involves recognition of centromeric DNA and histone modifications. CDCA7 senses hemimethylated DNA and recruits factors that maintain centromeric chromatin. CENP-A nucleosomes serve as a platform for binding of CENP-C, which in turn recruits outer kinetochore components. DNAJC9 maintains the supply of histones to ensure proper CENP-A incorporation. Electrostatic repulsion between nucleosomes may drive the formation of a defined core domain size. During meiosis, CENP-A and KNL-2/M18BP1 regulate the timing of outer kinetochore assembly. These mechanisms ensure that each chromosome has a single functional centromere.
Regulation of chromosome, centromeric core domain
In simple terms: The core domain is controlled by proteins that ensure the right amount of CENP-A is placed at the right place.
Regulation occurs at multiple levels. DNAJC9 prevents CENP-A mislocalization by maintaining histone supply chain fidelity. CDCA7 acts as a sensor of hemimethylated DNA, linking DNA methylation status to centromeric chromatin. In Schizosaccharomyces pombe, heterochromatin regulation pathways influence centromere function. Electrostatic interactions and chromatin folding provide biophysical constraints on core domain organization. During meiosis, CENP-A and KNL-2/M18BP1 coordinate outer kinetochore assembly. These regulatory mechanisms ensure genome stability.
Key Genes Involved in GO:0034506 chromosome, centromeric core domain
The following genes and proteins are key components or regulators of the chromosome, centromeric core domain (GO:0034506).
| Gene | Major Role | Research Relevance |
|---|---|---|
| CENPA | Centromeric histone H3 variant, defines centromere identity | Essential for kinetochore assembly; mislocalization causes instability |
| CENPB | Binds CENP-B box in centromeric DNA | Structural component of core centromeric nucleosome |
| CENPC | Links centromeric chromatin to kinetochore | Key for kinetochore assembly and chromosome segregation |
| CDCA7 | Hemimethylated DNA sensor | Regulates centromeric chromatin and genome stability |
| DNAJC9 | Histone chaperone | Prevents CENP-A mislocalization and chromosomal instability |
| KNL2 | Kinetochore null 2, centromere assembly factor | Required for CENP-A deposition and meiosis |
| M18BP1 | Mis18 binding protein 1 | Part of CENP-A deposition machinery |
| CENPN | Inner kinetochore protein | Binds CENP-A nucleosomes |
| CENPT | Inner kinetochore protein | Connects centromere to outer kinetochore |
| CENPW | Inner kinetochore protein | Part of CENP-T-W-S-X complex |
| CENPS | Inner kinetochore protein | Part of CENP-T-W-S-X complex |
| CENPX | Inner kinetochore protein | Part of CENP-T-W-S-X complex |
| HJURP | CENP-A chaperone | Deposits CENP-A at centromere |
| RSF1 | Chromatin remodeler | Regulates centromeric chromatin |
| CHD1 | Chromatin remodeler | Influences centromere function |
| SWI6 | Heterochromatin protein | Centromere function in S. pombe |
| CLR4 | Histone methyltransferase | H3K9 methylation at centromeres |
How Is chromosome, centromeric core domain Regulated?
Regulation of the centromeric core domain involves histone chaperones, DNA methylation sensors, and chromatin remodelers. DNAJC9 maintains histone supply to ensure CENP-A fidelity. CDCA7 senses hemimethylated DNA and influences centromeric chromatin. In S. pombe, heterochromatin regulation pathways including CLR4 and SWI6 control centromere function. Electrostatic interactions and higher-order folding provide biophysical regulation. During meiosis, CENP-A and KNL-2/M18BP1 regulate outer kinetochore assembly.
chromosome, centromeric core domain and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CENPA | Cancer, chromosomal instability | Knockout and overexpression in cancer cell lines |
| DNAJC9 | Chromosomal instability | Knockout in HeLa or HCT116 cells |
| CDCA7 | Immunodeficiency, centromeric instability | Knockout in patient-derived cells |
| KNL2 | Infertility, meiotic defects | Knockout in C. elegans |
| CENPC | Cancer, aneuploidy | Point mutation knock-in in cell lines |
Chromosomal Instability and Cancer
Defects in the centromeric core domain lead to chromosomal instability (CIN), a hallmark of cancer. DNAJC9 depletion causes CENP-A mislocalization and CIN. CENP-A overexpression is observed in many cancers and correlates with poor prognosis. Targeting centromeric proteins is a potential therapeutic strategy.
Developmental Disorders and Infertility
Proper centromere function is essential for meiosis; defects can cause infertility and developmental disorders. KNL-2/M18BP1 is required for meiosis in C. elegans. Mutations in centromeric proteins may lead to aneuploidy syndromes.
Viral Integration and Genome Stability
Centromeric regions are hotspots for viral integration, which can disrupt core domain function. HIV-1 reservoirs have been studied in this context. However, direct links to centromeric core domain remain to be fully elucidated.
From chromosome, centromeric core domain-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does CENP-A mislocalization cause CIN? | CENPA knockout and overexpression cell lines |
| What is the role of CDCA7 in centromeric chromatin? | CDCA7 knockout cells |
| How does DNAJC9 maintain histone supply? | DNAJC9 knockout and tagged knock-in |
| What is the structure of core centromeric nucleosome? | Recombinant nucleosome assembly and cryo-EM |
| How does KNL-2 regulate meiosis? | KNL2 knockout in C. elegans |
| How do electrostatic forces shape centromere? | Biophysical modeling and simulation |
How to Study the chromosome, centromeric core domain Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Protein-DNA binding | Mapping CENP-A and CENP-C at centromeres |
| Cryo-EM | 3D structure | Core centromeric nucleosome structure |
| Mass spectrometry | Protein composition | Identifying core complex components |
| CRISPR screen | Gene function | Identifying regulators of centromere |
| Live-cell imaging | Dynamic localization | Tracking centromere during mitosis |
| ATAC-seq | Chromatin accessibility | Assessing centromeric chromatin state |
| DNA methylation profiling | DNA methylation status | Detecting hemimethylated DNA |
| FRAP | Protein turnover | Measuring CENP-A dynamics |
Genomic and Epigenomic Approaches
ChIP-seq for CENP-A and other centromeric proteins maps their binding sites. ATAC-seq assesses chromatin accessibility. DNA methylation profiling identifies hemimethylated DNA recognized by CDCA7.
Proteomics and Structural Biology
Mass spectrometry identifies core centromeric complex components. Cryo-EM reveals nucleosome structure. Crosslinking mass spectrometry maps interactions.
Imaging and Live-Cell Analysis
Fluorescence microscopy visualizes centromere dynamics. Live-cell imaging tracks chromosome segregation. FRAP measures protein turnover at centromeres.
Functional Genomics and CRISPR Screens
CRISPR knockout screens identify genes required for centromere function. RNAi and CRISPRi validate candidates. Bioinformatics integrates multi-omics data.
How CRISPR Can Be Used to Study GO:0034506 chromosome, centromeric core domain
Knockout
CRISPR knockout of CENPA, DNAJC9, or CDCA7 disrupts centromeric core domain function, causing chromosomal instability and cell death. Knockout models are used to study gene essentiality and identify suppressors.
Point Mutation
Point mutations in CENPA or CENPC can be introduced to dissect domain-specific functions, such as CENP-A deposition or kinetochore binding. These models reveal structure-function relationships.
Knock-in
Knock-in of tagged CENP-A (e.g., GFP) allows live-cell imaging and proteomics. Knock-in of disease-associated mutations models human disorders.
Overexpression
Overexpression of CENP-A is common in cancer and causes mislocalization and instability. Overexpression models help study oncogenic roles and test therapeutics.
How EDITGENE Supports chromosome, centromeric core domain Research
Researchers studying chromosome, centromeric core domain-related genes often need to determine whether a candidate gene is causally involved in centromere function, chromosomal stability, or disease. EDITGENE provides comprehensive CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for chromosome, centromeric core domain research.
Frequently Asked Questions About chromosome, centromeric core domain
What is GO:0034506?
GO:0034506 is the Gene Ontology term for chromosome, centromeric core domain, the innermost portion of the centromere containing CENP-A nucleosomes and binding proteins.
What genes are involved in chromosome, centromeric core domain?
Key genes include CENPA, CENPB, CENPC, CDCA7, DNAJC9, KNL2, and M18BP1.
Why is the centromeric core domain important?
It ensures accurate chromosome segregation; defects cause chromosomal instability and cancer.
How is the centromeric core domain assembled?
CENP-A is deposited by chaperones like HJURP, and DNAJC9 maintains histone supply fidelity.
What diseases are linked to centromeric core domain defects?
Cancer, infertility, and developmental disorders are associated with centromere dysfunction.
What methods study the centromeric core domain?
ChIP-seq, cryo-EM, CRISPR screens, and live-cell imaging are commonly used.
What is the role of CDCA7 in centromeres?
CDCA7 is a hemimethylated DNA sensor that influences centromeric chromatin.
How does DNAJC9 prevent CENP-A mislocalization?
DNAJC9 maintains histone supply chain fidelity, ensuring proper CENP-A incorporation.
Is the centromeric core domain conserved?
It is conserved but varies across species, as seen in equids and C. elegans.
How can CRISPR help study centromeric core domain?
CRISPR knockout, knock-in, and screens enable functional dissection of centromeric genes.
Conclusion
The chromosome, centromeric core domain (GO:0034506) is a fundamental cellular component required for genome stability. Its assembly and regulation involve a complex network of proteins, including CENP-A, CDCA7, and DNAJC9. Dysregulation leads to chromosomal instability and diseases such as cancer. Continued research using advanced CRISPR and imaging technologies will further illuminate its mechanisms and therapeutic potential.
References
- 1. Wassing IE et al.. 2024. CDCA7 is an evolutionarily conserved hemimethylated DNA sensor in eukaryotes.. Sci Adv 10(34):eadp5753 PMID: 39178260
- 2. Cappelletti E et al.. 2025. CENP-A and centromere evolution in equids.. Chromosome Res 33(1):13 PMID: 40586953
- 3. Jiang C et al.. 2020. Distinct viral reservoirs in individuals with spontaneous control of HIV-1.. Nature 585(7824):261-267 PMID: 32848246
- 4. Bell C et al.. 2025. An electrostatic repulsion model of centromere organisation.. bioRxiv PMID: 40950056
- 5. Muhammad A et al.. 2024. A systematic quantitative approach comprehensively defines domain-specific functional pathways linked to Schizosaccharomyces pombe heterochromatin regulation.. Nucleic Acids Res 52(22):13665-13689 PMID: 39565189
- 6. Balachandra V et al.. 2024. DNAJC9 prevents CENP-A mislocalization and chromosomal instability by maintaining the fidelity of histone supply chains.. EMBO J 43(11):2166-2197 PMID: 38600242
- 7. Allu PK et al.. 2019. Structure of the Human Core Centromeric Nucleosome Complex.. Curr Biol 29(16):2625-2639.e5 PMID: 31353180
- 8. Bellutti L et al.. 2024. Regulation of outer kinetochore assembly during meiosis I and II by CENP-A and KNL-2/M18BP1 in C. elegans oocytes.. Curr Biol 34(21):4853-4868.e6 PMID: 39353426
