GO:0160123 structural constituent of nuclear lamina: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0160123 defines the molecular function of proteins that provide structural integrity to the nuclear lamina, a dense fibrillar network underlying the inner nuclear membrane.
• Core structural constituents include lamins (LMNA, LMNB1, LMNB2) and lamin-associated proteins such as LAP2alpha (TMPO), emerin (EMD), and LBR.
• The nuclear lamina is not merely a static scaffold; it organizes chromatin, anchors nuclear pore complexes, and transmits mechanical signals.
• Mutations in lamina proteins cause laminopathies, including striated muscle diseases, lipodystrophies, and premature aging syndromes.
• Proximity-dependent biotin identification (BioID) has expanded the inventory of nuclear lamina-associated proteins, revealing dynamic interactions.
• Plant and algal models reveal deep evolutionary conservation of nuclear lamina components, offering tractable systems for functional studies.
Description
The nuclear lamina is a proteinaceous meshwork that lines the inner surface of the nuclear envelope in metazoans and plants. It provides mechanical stability to the nucleus and serves as a platform for chromatin organization, gene regulation, and nuclear envelope integrity. The Gene Ontology term GO:0160123, structural constituent of nuclear lamina, describes the molecular function of proteins that contribute to this structural framework. Understanding this function is critical because disruptions in lamina components underlie a spectrum of human diseases, collectively termed laminopathies, which include muscular dystrophies, cardiomyopathies, and premature aging disorders. Moreover, the lamina is hijacked during viral infection, as seen with herpes simplex virus, which breaches the lamina during assembly. Research into the structural constituents of the nuclear lamina has been accelerated by advanced proteomic and imaging techniques, such as proximity-dependent biotin identification (BioID), which identified numerous lamina-associated proteins. Comparative studies in plants and algae have further highlighted conserved and divergent features of this structure. This article synthesizes current knowledge on the molecular function, key genes, disease relevance, and experimental models for studying GO:0160123.
structural constituent of nuclear lamina At A Glance
| GO ID | GO:0160123 |
|---|---|
| GO term | structural constituent of nuclear lamina |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Provides structural integrity to the nuclear lamina, a fibrillar network underlying the inner nuclear membrane. |
| Key proteins | Lamins (LMNA, LMNB1, LMNB2), LAP2alpha (TMPO), emerin (EMD), LBR. |
| Associated cellular component | Nuclear lamina (GO:0005652). |
| Disease relevance | Mutations cause laminopathies including striated muscle diseases and premature aging. |
| Evolutionary conservation | Present in metazoans, plants, and algae with structural diversity. |
What Is GO:0160123?
GO:0160123, structural constituent of nuclear lamina, is a molecular function term defined as the action of a molecule that contributes to the structural integrity of the nuclear lamina. In other words, it describes proteins that physically build and maintain the fibrous network underlying the inner nuclear membrane, providing mechanical support and organizing nuclear architecture.
Why Is structural constituent of nuclear lamina Important in Cell Biology?
The structural constituent of nuclear lamina function is fundamental to nuclear architecture and cell physiology. Proteins fulfilling this function maintain nuclear shape, resist mechanical stress, and organize chromatin into functional domains. Defects in these proteins lead to a wide range of human diseases, including muscular dystrophies, cardiomyopathies, lipodystrophies, and accelerated aging syndromes. Additionally, the nuclear lamina is a key battleground during viral infection, as viruses like herpes simplex virus disrupt it to release capsids. Understanding this function is therefore essential for developmental biology, mechanobiology, and disease research.
• Maintains nuclear mechanical stability and shape.
• Organizes chromatin and regulates gene expression.
• Anchors nuclear pore complexes and other envelope proteins.
• Mutations cause laminopathies such as Emery-Dreifuss muscular dystrophy and Hutchinson-Gilford progeria syndrome.
• Involved in viral pathogenesis, including herpes simplex virus egress.
• Provides a platform for signaling and mechanotransduction.
• Evolutionarily conserved across plants and algae, enabling comparative studies.
• Target for proximity proteomics to discover novel lamina-associated proteins.
• Potential therapeutic target for laminopathies and cancer.
• Key to understanding nuclear envelope reassembly after mitosis.
Molecular Mechanism of structural constituent of nuclear lamina
Lamin polymerization and filament assembly
In simple terms: Lamins link together to form long fibers that make up the nuclear lamina.
Lamins are type V intermediate filament proteins that assemble into higher-order filaments. They form dimers through coiled-coil interactions, which then associate head-to-tail to form protofilaments and eventually a meshwork. This assembly is critical for the structural integrity of the nuclear lamina. The dimerization interface of LAP2alpha, a lamin-associated protein, has been structurally characterized, revealing how it may interact with lamins.
Interaction with inner nuclear membrane proteins
In simple terms: Lamina proteins bind to proteins embedded in the nuclear membrane to anchor the meshwork.
Structural constituents of the nuclear lamina interact with integral inner nuclear membrane proteins such as emerin, LBR, and LAP2alpha. These interactions anchor the lamina to the membrane and connect it to the cytoskeleton. For example, LAP2alpha binds to lamins and chromatin, contributing to nuclear organization.
Chromatin tethering and genome organization
In simple terms: The lamina grabs onto DNA to help organize it inside the nucleus.
The nuclear lamina serves as a platform for genome organization by tethering chromatin domains to the nuclear periphery. This tethering is mediated by lamina-associated proteins that bind to specific chromatin marks or DNA sequences. This function influences gene expression and DNA replication timing.
Dynamic regulation during mitosis and viral infection
In simple terms: The lamina can be taken apart and rebuilt, and viruses can break it.
During mitosis, the nuclear lamina disassembles and reassembles, a process regulated by phosphorylation of lamins. Viruses such as herpes simplex virus breach the lamina during assembly to facilitate capsid release. These dynamic changes highlight the regulated nature of this structural function.
Key Genes Involved in GO:0160123 structural constituent of nuclear lamina
The following genes encode proteins that function as structural constituents of the nuclear lamina or are closely associated with it.
| Gene | Major Role | Research Relevance |
|---|---|---|
| LMNA | Primary lamin A/C; forms filamentous meshwork | Mutations cause laminopathies; widely studied |
| LMNB1 | Lamin B1; component of the lamina | Altered in aging and cancer; structural role |
| LMNB2 | Lamin B2; component of the lamina | Less studied; potential redundancy with LMNB1 |
| TMPO | LAP2alpha; binds lamins and chromatin | Structural basis for dimerization solved |
| EMD | Emerin; inner nuclear membrane protein | Mutations cause Emery-Dreifuss muscular dystrophy |
| LBR | Lamin B receptor; anchors lamina to membrane | Involved in chromatin organization |
| LEMD3 | MAN1; inner nuclear membrane protein | Regulates TGF-beta signaling; laminopathy link |
| SYNE1 | Nesprin-1; links nucleus to cytoskeleton | Muscular dystrophy and cerebellar ataxia |
| SYNE2 | Nesprin-2; links nucleus to cytoskeleton | Similar to SYNE1; mechanotransduction |
| BANF1 | BAF; binds DNA and lamina proteins | Mutations cause progeroid syndrome |
| ZMPSTE24 | Metalloprotease processing prelamin A | Defects cause restrictive dermopathy |
| NUP153 | Nuclear pore protein; interacts with lamina | Links lamina to nuclear pores |
| SUN1 | Inner nuclear membrane protein; LINC complex | Connects lamina to cytoskeleton |
| SUN2 | Inner nuclear membrane protein; LINC complex | Similar to SUN1 |
| AKAP149 | Anchors protein kinase A to lamina | Regulates lamin phosphorylation |
| PRKACA | Catalytic subunit of PKA; phosphorylates lamins | Regulates lamina disassembly |
| CDK1 | Cyclin-dependent kinase 1; phosphorylates lamins | Controls mitotic lamina disassembly |
How Is structural constituent of nuclear lamina Regulated?
The structural constituent of nuclear lamina function is regulated primarily through post-translational modifications, especially phosphorylation. During mitosis, CDK1 phosphorylates lamins, causing disassembly of the lamina, which is reversed by phosphatases during reassembly. Additionally, the processing of prelamin A by ZMPSTE24 is crucial for proper lamin A incorporation into the lamina; defects lead to progeroid syndromes. Viral proteins can also modulate lamina integrity, as seen with herpes simplex virus.
structural constituent of nuclear lamina and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| LMNA | Emery-Dreifuss muscular dystrophy, progeria | Knockout and point-mutation mice, patient iPSCs |
| ZMPSTE24 | Restrictive dermopathy | Zmpste24 knockout mice |
| EMD | Emery-Dreifuss muscular dystrophy | Emd knockout mice, CRISPR KO cells |
| LMNB1 | Adult-onset autosomal dominant leukodystrophy | Transgenic overexpression mice |
| BANF1 | Nestor-Guillermo progeria syndrome | Knock-in mice, patient fibroblasts |
Laminopathies: Striated muscle diseases
Mutations in LMNA and other lamina genes cause striated muscle laminopathies, including Emery-Dreifuss muscular dystrophy, limb-girdle muscular dystrophy, and dilated cardiomyopathy. These diseases highlight the importance of the nuclear lamina in muscle function and mechanotransduction.
Premature aging syndromes
Hutchinson-Gilford progeria syndrome and restrictive dermopathy result from mutations in LMNA or ZMPSTE24, leading to accumulation of toxic prelamin A or progerin. These defects disrupt the nuclear lamina and cause accelerated aging.
Viral pathogenesis
Herpes simplex virus breaches the nuclear lamina during assembly to facilitate capsid release. This process involves viral proteins that disrupt lamina structure, highlighting the lamina as a target during infection.
From structural constituent of nuclear lamina-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of LMNA disrupt nuclear lamina integrity? | LMNA knockout cell lines (e.g., HeLa, HEK293) |
| How do point mutations in LMNA cause progeria? | Knock-in mice expressing progerin |
| Can wild-type lamin A rescue lamina defects? | Overexpression of LMNA in patient fibroblasts |
| What proteins interact with lamin B1? | Tagged knock-in of LMNB1 with BioID |
| How does emerin anchor to the lamina? | Point mutations in EMD, knock-in models |
| Does lamin phosphorylation regulate disassembly? | Phospho-mutant knock-in of LMNA |
How to Study the structural constituent of nuclear lamina Process
| Method | What It Measures | Typical Application |
|---|---|---|
| BioID | Proximity interactions of lamina proteins | Discovering novel lamina-associated proteins |
| X-ray crystallography | 3D structure of protein domains | Understanding LAP2alpha dimerization |
| Immunofluorescence | Localization and morphology of lamina | Assessing lamina integrity in disease models |
| Electron microscopy | Ultrastructure of nuclear envelope | Visualizing lamina breaches during viral infection |
| RNA-seq | Gene expression changes | Profiling laminopathy models |
| Proteomics | Protein abundance and modifications | Identifying phosphorylated lamins |
| CRISPR screening | Functional gene identification | Finding modifiers of lamina stability |
| Co-immunoprecipitation | Protein-protein interactions | Validating lamina interactions |
Proximity-dependent biotin identification (BioID)
BioID uses a promiscuous biotin ligase fused to a lamina protein to label nearby proteins in living cells. This method has identified numerous lamina-associated proteins, expanding the inventory of structural constituents.
Structural biology (X-ray crystallography, NMR)
Structural studies, such as the crystal structure of LAP2alpha dimerization domain, reveal how lamina proteins interact at the molecular level.
Imaging (fluorescence and electron microscopy)
Immunofluorescence and electron microscopy visualize the nuclear lamina and its disruption in disease or infection.
Genomic and proteomic approaches
RNA-seq and proteomics can assess expression changes in lamina genes and identify post-translational modifications.
How CRISPR Can Be Used to Study GO:0160123 structural constituent of nuclear lamina
Knockout
CRISPR knockout of lamina genes such as LMNA, LMNB1, or EMD in cell lines (e.g., HeLa, HEK293) can reveal their essential roles in nuclear stability and cell viability. These models are valuable for studying laminopathies and testing rescue strategies.
Point Mutation
Introducing disease-associated point mutations (e.g., LMNA p.G608G for progeria) via CRISPR base editing or HDR allows precise modeling of laminopathies and investigation of molecular mechanisms.
Knock-in
Knock-in of tags (e.g., GFP, BioID) into endogenous lamina genes enables live-cell imaging and proximity proteomics to study dynamics and interactions.
Overexpression
Overexpression of wild-type or mutant lamina proteins (e.g., progerin) in cells can mimic disease phenotypes and test therapeutic interventions.
How EDITGENE Supports structural constituent of nuclear lamina Research
Researchers studying structural constituent of nuclear lamina-related genes often need to determine whether a candidate gene is causally involved in nuclear organization, disease pathogenesis, or viral infection. EDITGENE provides comprehensive CRISPR-based services to create precise cellular and animal models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for structural constituent of nuclear lamina research.
Frequently Asked Questions About structural constituent of nuclear lamina
What is GO:0160123?
GO:0160123 is a Gene Ontology molecular function term defined as the action of a molecule that contributes to the structural integrity of the nuclear lamina.
What genes are involved in structural constituent of nuclear lamina?
Key genes include LMNA, LMNB1, LMNB2, TMPO, EMD, and LBR, among others.
What diseases are associated with nuclear lamina proteins?
Mutations cause laminopathies such as Emery-Dreifuss muscular dystrophy, dilated cardiomyopathy, and Hutchinson-Gilford progeria syndrome.
How is the nuclear lamina studied?
Common methods include BioID, immunofluorescence, electron microscopy, and CRISPR-based gene editing.
What is the role of lamins in the nuclear lamina?
Lamins are intermediate filament proteins that polymerize to form the structural meshwork of the nuclear lamina.
Can CRISPR be used to model laminopathies?
Yes, CRISPR knockout, point mutation, and knock-in models are widely used to study laminopathy mechanisms and test therapies.
What is the evolutionary conservation of the nuclear lamina?
Nuclear lamina components are conserved in metazoans, plants, and algae, with structural diversity.
How does the nuclear lamina regulate gene expression?
It tethers chromatin to the nuclear periphery, influencing gene expression and genome organization.
What is the role of the nuclear lamina in viral infection?
Viruses like herpes simplex virus breach the lamina during assembly to release capsids.
What experimental models are available for studying nuclear lamina?
Models include knockout mice, patient-derived iPSCs, and CRISPR-edited cell lines.
Conclusion
The structural constituent of nuclear lamina function (GO:0160123) is essential for nuclear architecture, mechanotransduction, and genome organization. Its disruption leads to a range of human diseases, from muscular dystrophies to premature aging. Advances in CRISPR gene editing and proximity proteomics continue to illuminate the molecular players and mechanisms. EDITGENE offers a suite of services to help researchers model and study these components effectively.
References
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- 3. Azibani F et al.. 2014. Striated muscle laminopathies.. Semin Cell Dev Biol 29:107-15 PMID: 24440603
- 4. Ciska M et al.. 2014. The intriguing plant nuclear lamina.. Front Plant Sci 5:166 PMID: 24808902
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