GO:0030575 nuclear body organization: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0030575 nuclear body organization describes the assembly, arrangement, and disassembly of extra-nucleolar nuclear domains such as nuclear speckles and PML nuclear bodies [1, 7].
• Nuclear bodies are membraneless condensates whose composition and size are controlled by phase separation and RNA-dependent scaffolding [2, 8].
• Nuclear speckles are positioned near highly active genes and support efficient mRNA splicing, linking nuclear body organization to gene expression output [1, 6].
• PML nuclear bodies regulate senescence, apoptosis, and DNA damage responses, and their disruption is associated with acute promyelocytic leukemia and other cancers.
• Proximal proteomics has revealed a landscape of human nuclear condensates, providing a resource for identifying new nuclear body components.
• CRISPR knockout, knock-in, and overexpression models enable causal testing of nuclear body genes in human cell lines [7, 8].
Description
Nuclear body organization (GO:0030575) is the biological process that builds, positions, and remodels the membraneless compartments of the cell nucleus, excluding the nucleolus [1, 7]. These compartments, including nuclear speckles and PML nuclear bodies, concentrate specific proteins and RNAs to carry out functions such as splicing, stress response, and gene regulation [1, 7]. Because nuclear bodies are not enclosed by membranes, their organization depends on weak, multivalent interactions and on RNA scaffolds that can be dynamically regulated [2, 8]. Understanding this process is therefore central to understanding how the nucleus partitions biochemical activities in space and time [1, 8].
nuclear body organization At A Glance
| GO ID | GO:0030575 |
|---|---|
| GO term | nuclear body organization |
| Ontology | biological_process |
| Synonym | nuclear body organisation; nuclear body organization and biogenesis |
| Definition | A process that is carried out at the cellular level which results in the assembly, arrangement of constituent parts, or disassembly of any of the extra-nucleolar nuclear domains usually visualized by confocal microscopy and fluorescent antibodies to specific proteins. |
| Major function | Assembly, positioning, and turnover of membraneless nuclear compartments such as nuclear speckles and PML nuclear bodies [1, 7]. |
| Key structural feature | Membraneless condensates formed by phase separation and RNA-protein scaffolds [2, 8]. |
| Representative bodies | Nuclear speckles, PML nuclear bodies, and other extra-nucleolar condensates [1, 5, 7]. |
| Associated processes | mRNA splicing, DNA damage response, senescence, and gene regulation [1, 6, 7]. |
What Is GO:0030575?
According to the Gene Ontology, GO:0030575 nuclear body organization is a cellular-level process that results in the assembly, arrangement of constituent parts, or disassembly of any extra-nucleolar nuclear domain that is usually visualized by confocal microscopy and fluorescent antibodies to specific proteins [1, 7]. In practice, this includes the formation, maintenance, and turnover of structures such as nuclear speckles and PML nuclear bodies, as well as the positioning of these bodies relative to chromatin [1, 5, 7].
Why Is nuclear body organization Important in Cell Biology?
Nuclear body organization matters because it determines where and when key nuclear reactions occur. Nuclear speckles are positioned near highly expressed genes and support efficient splicing of GC-rich transcripts, so their organization directly influences mRNA output [1, 6]. PML nuclear bodies integrate stress signals and regulate senescence and apoptosis, and their disruption is linked to cancer. Because nuclear bodies are RNA-dependent condensates, their organization also provides a paradigm for understanding how RNA shapes nuclear architecture.
• Nuclear speckles are positioned near active genes and enhance mRNA splicing efficiency.
• PML nuclear bodies regulate senescence, apoptosis, and DNA damage responses.
• Disruption of PML nuclear bodies is associated with acute promyelocytic leukemia and other cancers.
• RNA scaffolds are essential for shaping nuclear organization, including nuclear body formation.
• Phase separation provides a physical mechanism for nuclear body assembly and compositional control.
• Proximal proteomics has mapped human nuclear condensates, revealing new components and disease links.
• Plant nuclear lamina CRWN proteins regulate chromatin organization and nuclear body formation, showing evolutionary conservation.
• Nuclear body organization is a potential therapeutic target in cancers with altered condensate biology.
• Meningioma molecular classification highlights the relevance of nuclear organization to CNS tumors.
• CRISPR screens can identify genes required for nuclear body assembly and maintenance [7, 8].
What Happens During nuclear body organization?
Nucleation and seeding of nuclear bodies
In simple terms: Nuclear bodies start as small seeds that form when certain proteins and RNAs gather together.
Nuclear body organization begins with nucleation, where scaffold proteins and RNAs concentrate to form a seed. Phase separation driven by multivalent interactions among proteins and RNAs is a key mechanism for this seeding [2, 8]. For example, PML protein initiates PML nuclear body formation, and nuclear speckle proteins such as SRRM2 and SON seed speckles [7, 5].
Growth and compositional control
In simple terms: Once seeded, nuclear bodies grow by recruiting more components, but their size and composition are tightly controlled.
After nucleation, nuclear bodies grow by recruiting additional proteins and RNAs. Compositional control is achieved through competitive interactions and post-translational modifications that regulate phase separation. Proximal proteomics has identified numerous components of human nuclear condensates, showing that each body has a distinct molecular signature.
Positioning relative to chromatin
In simple terms: Nuclear bodies are not randomly placed; they are positioned near specific genes to support their activity.
Nuclear speckles localize near highly active genes, and this positioning is important for efficient mRNA splicing. Genome organization around nuclear speckles drives splicing efficiency, indicating that nuclear body positioning is functionally coupled to transcription. RNA helps shape this organization by contributing to the spatial arrangement of nuclear bodies.
Disassembly and turnover
In simple terms: Nuclear bodies can also break apart or be remodeled when cells no longer need them.
Nuclear body organization includes disassembly. During mitosis, many nuclear bodies disassemble and reassemble in daughter cells. Turnover is regulated by changes in protein modifications and RNA availability, allowing cells to adapt nuclear organization to changing conditions [2, 8].
Key Genes Involved in GO:0030575 nuclear body organization
The following genes and proteins are experimentally implicated in nuclear body organization, including nuclear speckle and PML nuclear body components.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PML | Scaffold for PML nuclear bodies | Central to PML body biogenesis and leukemia |
| SRRM2 | Nuclear speckle scaffold protein | Speckle assembly and splicing regulation |
| SON | Nuclear speckle protein | Speckle organization and RNA processing |
| SRRM1 | Nuclear speckle component | Splicing factor recruitment |
| SRSF1 | SR protein in speckles | Splicing and speckle dynamics |
| SRSF2 | SR protein in speckles | Splicing and speckle organization |
| DDX39B | RNA helicase in speckles | mRNA export and speckle function |
| RBM39 | Splicing factor in speckles | Speckle composition and splicing |
| U2AF1 | Splicing factor | Speckle-associated splicing |
| U2AF2 | Splicing factor | Speckle-associated splicing |
| SF3B1 | Spliceosome component | Speckle-related splicing |
| CRWN1 | Plant nuclear lamina protein | Nuclear body formation in plants |
| CRWN4 | Plant nuclear lamina protein | Chromatin and nuclear body regulation |
| SP100 | PML body component | PML body organization |
| DAXX | PML body component | PML body regulation and apoptosis |
| ATRX | PML body associated protein | Chromatin and PML body function |
| SUMO1 | Post-translational modifier | PML body assembly and dynamics |
| NONO | Nuclear body protein | Paraspeckle and nuclear body organization |
How Is nuclear body organization Regulated?
Nuclear body organization is regulated by RNA levels, post-translational modifications, and phase separation properties. RNA is essential for shaping nuclear organization, including the formation and maintenance of nuclear bodies. SUMOylation regulates PML nuclear body assembly and disassembly. Phosphorylation of SR proteins modulates nuclear speckle dynamics and splicing activity. Compositional control of phase-separated bodies is achieved through changes in protein concentration and interaction valency.
nuclear body organization and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PML | Acute promyelocytic leukemia | PML knockout and PML-RARA knock-in in HL-60 or NB4 cells |
| SRRM2 | Splicing dysregulation in cancer | SRRM2 knockout in HeLa or HEK293T cells |
| SON | Splicing and nuclear speckle defects | SON knockout in HAP1 cells |
| SRSF2 | Myelodysplastic syndromes | SRSF2 point mutation knock-in in K562 cells |
| CRWN1 | Plant development | CRWN1 knockout in Arabidopsis |
Cancer and PML nuclear bodies
Disruption of PML nuclear bodies is associated with acute promyelocytic leukemia (APL), where the PML-RARA fusion protein impairs PML body organization. PML body dysfunction also contributes to other cancers by altering senescence and apoptosis. Targeting PML nuclear body biogenesis is being explored as a therapeutic strategy.
Nuclear speckles and splicing dysregulation
Altered nuclear speckle organization can affect mRNA splicing efficiency, which is relevant to cancers with splicing factor mutations [1, 6]. Nuclear speckles enable processing of RNA from GC-rich isochores, and their disruption may contribute to splicing-related diseases.
Neurological and developmental disorders
Meningioma molecular updates highlight the importance of nuclear organization in CNS tumors, although direct links to nuclear body organization require further study. Plant CRWN proteins regulate nuclear body formation, suggesting conserved roles in development.
From nuclear body organization-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does PML loss disrupt nuclear body organization? | PML knockout in human cell lines |
| Does a point mutation in SRSF2 alter speckle dynamics? | SRSF2 point mutation knock-in |
| Can a tagged protein track nuclear body assembly? | Endogenous knock-in of fluorescent tag |
| Does overexpression of SRRM2 enlarge speckles? | SRRM2 overexpression |
| Which genes are required for nuclear body formation? | CRISPR library screening |
| How does RNA affect nuclear body organization? | RNA depletion or RNase treatment |
How to Study the nuclear body organization Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Confocal immunofluorescence | Number, size, and localization of nuclear bodies | Visualizing PML bodies and speckles |
| Live-cell imaging | Dynamics of nuclear body assembly/disassembly | Tracking GFP-tagged PML |
| Proximity proteomics (APEX/BioID) | Protein composition of nuclear bodies | Mapping nuclear condensates |
| RNA-seq | Gene expression and splicing changes | Assessing splicing after speckle disruption |
| CRISPR knockout screening | Genes required for nuclear body formation | Identifying novel regulators |
| FRAP | Molecular turnover within nuclear bodies | Measuring protein dynamics |
| Single-molecule FISH | RNA localization relative to nuclear bodies | Linking RNA to speckles |
| ChIP-seq | Chromatin association of nuclear body proteins | Genome organization around speckles |
Fluorescence microscopy and live imaging
Confocal microscopy with fluorescent antibodies or tagged proteins is the standard method to visualize nuclear bodies and quantify their number, size, and position [1, 7]. Live imaging of GFP-tagged PML or SRRM2 allows tracking of assembly and disassembly dynamics.
Proximity proteomics
Proximal proteomics using APEX or BioID has revealed a landscape of human nuclear condensates, identifying new components of nuclear bodies. This method can map the proteome of specific nuclear bodies in living cells.
RNA-seq and splicing analysis
RNA-seq measures changes in gene expression and splicing upon perturbation of nuclear body genes [1, 6]. Splicing efficiency of GC-rich transcripts is particularly sensitive to nuclear speckle organization.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for nuclear body assembly or maintenance. Hits can be validated by imaging-based assays.
How CRISPR Can Be Used to Study GO:0030575 nuclear body organization
Knockout
CRISPR knockout of PML, SRRM2, or SON can abolish or disrupt nuclear bodies, allowing functional studies of their roles in splicing and stress responses [7, 5]. Knockout cell lines are essential for testing causality.
Point Mutation
Point mutations in splicing factors such as SRSF2 can be introduced to model disease-associated variants and study their impact on nuclear speckle organization. These models help dissect domain-specific functions.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) at endogenous loci enables real-time tracking of nuclear body proteins without overexpression artifacts. Tagged knock-in lines are valuable for imaging-based screens.
Overexpression
Overexpression of scaffold proteins like SRRM2 or PML can drive formation of enlarged or ectopic nuclear bodies, revealing sufficiency for assembly [2, 7]. Overexpression models are useful for testing phase separation properties.
How EDITGENE Supports nuclear body organization Research
Researchers studying nuclear body organization-related genes often need to determine whether a candidate gene is causally involved in the assembly, maintenance, or disassembly of nuclear bodies. EDITGENE provides a comprehensive suite of CRISPR services to enable such causal experiments in relevant cell models.
Contact EDITGENE today to design your custom CRISPR model for nuclear body organization research.
Frequently Asked Questions About nuclear body organization
What is nuclear body organization (GO:0030575)?
It is the biological process that assembles, arranges, and disassembles extra-nucleolar nuclear domains such as nuclear speckles and PML nuclear bodies [1, 7].
What genes are involved in nuclear body organization?
Key genes include PML, SRRM2, SON, SRSF1, SRSF2, and other splicing factors and scaffold proteins [1, 5, 7].
How are nuclear bodies formed?
They form through phase separation and RNA-dependent scaffolding, nucleated by specific proteins [2, 8].
What is the function of nuclear speckles?
Nuclear speckles are positioned near active genes and support efficient mRNA splicing, especially for GC-rich transcripts [1, 6].
What are PML nuclear bodies?
PML nuclear bodies are membraneless compartments that regulate senescence, apoptosis, and DNA damage responses.
How can I study nuclear body organization?
Common methods include confocal imaging, live-cell imaging, proximity proteomics, RNA-seq, and CRISPR screens [1, 5, 7].
What diseases are linked to nuclear body organization?
Disruption of PML nuclear bodies is linked to acute promyelocytic leukemia and other cancers.
Can CRISPR be used to study nuclear bodies?
Yes, CRISPR knockout, knock-in, and overexpression models are widely used to test gene function in nuclear body organization [7, 5].
What is the role of RNA in nuclear body organization?
RNA is essential for shaping nuclear organization, including the formation and maintenance of nuclear bodies.
How does phase separation relate to nuclear bodies?
Phase separation driven by multivalent interactions controls the composition and size of nuclear bodies.
Conclusion
Nuclear body organization (GO:0030575) is a fundamental process that builds and positions membraneless compartments such as nuclear speckles and PML nuclear bodies. These structures are critical for mRNA splicing, stress responses, and gene regulation, and their dysfunction is linked to cancer and other diseases [1, 7]. Continued research using CRISPR models and advanced imaging will further clarify the mechanisms and therapeutic potential of targeting nuclear body organization [5, 8].
References
- 1. Bhat P et al.. 2024. Genome organization around nuclear speckles drives mRNA splicing efficiency.. Nature 629(8014):1165-1173 PMID: 38720076
- 2. Banani SF et al.. 2016. Compositional Control of Phase-Separated Cellular Bodies.. Cell 166(3):651-663 PMID: 27374333
- 3. Soni N et al.. 2025. Meningioma: Molecular Updates from the 2021 World Health Organization Classification of CNS Tumors and Imaging Correlates.. AJNR Am J Neuroradiol 46(2):240-250 PMID: 38844366
- 4. Sakamoto Y. 2020. Nuclear lamina CRWN proteins regulate chromatin organization, gene expression, and nuclear body formation in plants.. J Plant Res 133(4):457-462 PMID: 32232600
- 5. Li R et al.. 2025. Proximal proteomics reveals a landscape of human nuclear condensates.. Nat Cell Biol 27(12):2198-2213 PMID: 41315769
- 6. Małszycki M et al.. 2026. Nuclear speckles enable processing of RNA from GC-rich isochores.. Cell 189(7):2024-2039.e25 PMID: 41747727
- 7. Li Y et al.. 2020. PML Nuclear Body Biogenesis, Carcinogenesis, and Targeted Therapy.. Trends Cancer 6(10):889-906 PMID: 32527650
- 8. Quinodoz SA et al.. 2022. Essential Roles for RNA in Shaping Nuclear Organization.. Cold Spring Harb Perspect Biol 14(5) PMID: 34400555
