GO:0048251 elastic fiber assembly: Extracellular Matrix Assembly, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0048251 (elastic fiber assembly) is the biological process that builds extracellular matrix fibers enabling tissues to recoil after transient stretching.
• Elastic fiber assembly requires tropoelastin, fibrillin microfibrils, and accessory proteins such as MAGP-2 and lysyl oxidase for cross-linking.
• Defects in elastic fiber assembly cause diseases including supravalvular aortic stenosis, cutis laxa, and emphysema.
• Mechanical ventilation and hemodynamic forces influence elastic fiber assembly in lung and vascular tissues.
• CRISPR knockout, knock-in, and overexpression models are essential to dissect gene function in elastic fiber assembly.
• Studying this process requires ultrastructural imaging, proteomics, and functional stretch-recoil assays.
Description
Elastic fiber assembly (GO:0048251) is the biological process that constructs extracellular matrix fibers capable of recoiling after transient stretching, providing resilience to tissues such as skin, lungs, and large arteries. This process is fundamental for organ function, as elastic fibers allow repeated cycles of extension and relaxation without damage. Disruption of elastic fiber assembly leads to a spectrum of pathologies, including aortic stenosis, cutis laxa, and emphysema, making it a critical area of biomedical research. Understanding the molecular players and regulatory mechanisms of elastic fiber assembly is essential for developing therapeutic strategies. Recent advances in three-dimensional vascular models and CRISPR-based gene editing have accelerated the study of this process.
elastic fiber assembly At A Glance
| GO ID | GO:0048251 |
|---|---|
| GO term | elastic fiber assembly |
| Ontology | biological_process |
| Synonym | elastic fibre assembly, elastin fiber assembly, elastin fibre assembly |
| Major function | Assembly of extracellular matrix fibers that enable recoil after transient stretching |
| Key components | Tropoelastin, fibrillin microfibrils, MAGP-2, lysyl oxidase |
| Associated diseases | Supravalvular aortic stenosis, cutis laxa, emphysema |
| Research models | Knockout mice, 3D vascular models, CRISPR-edited cells |
What Is GO:0048251?
Elastic fiber assembly is the biological process in which cells secrete and organize components to form extracellular matrix fibers that enable the matrix to recoil after transient stretching. This process involves the deposition of tropoelastin onto microfibrillar scaffolds, cross-linking by lysyl oxidase, and interaction with accessory proteins to create durable, elastic fibers.
Why Is elastic fiber assembly Important in Cell Biology?
Elastic fiber assembly is essential for the mechanical integrity of dynamic tissues, and its dysfunction underlies numerous congenital and acquired disorders. Because elastic fibers are long-lived and poorly regenerated, defects in assembly have profound consequences for tissue homeostasis and repair. Research into this process informs therapeutic approaches for cardiovascular, pulmonary, and dermatological diseases.
• Provides recoil and resilience to arteries, lungs, and skin.
• Mutations in elastin and fibrillin genes cause supravalvular aortic stenosis and Marfan syndrome.
• Impaired assembly contributes to emphysema and chronic obstructive pulmonary disease.
• Mechanical ventilation can disrupt elastic fiber assembly in neonatal lungs.
• MAGP-2 enhances elastic fiber assembly and is a potential therapeutic target.
• Three-dimensional vascular models enable study of smooth muscle cell-derived elastic fibers.
• Elastic fiber assembly is critical for skin elasticity and wound healing.
• Understanding assembly mechanisms aids tissue engineering and regenerative medicine.
• Dysregulation is linked to hypertension and vascular stiffening.
• CRISPR screens can identify novel regulators of elastic fiber assembly.
What Happens During elastic fiber assembly?
Tropoelastin Secretion and Microfibril Scaffold Formation
In simple terms: Cells first build a scaffold of microfibrils and then deposit elastin onto it.
Elastic fiber assembly begins with the secretion of tropoelastin and the formation of fibrillin-rich microfibrils, which serve as a scaffold for elastin deposition. Fibrillin microfibrils provide structural support and guide the assembly process. Tropoelastin molecules are then aligned along these microfibrils, ready for cross-linking.
Cross-Linking by Lysyl Oxidase
In simple terms: Enzymes cross-link elastin molecules to make the fiber stable and stretchy.
Lysyl oxidase (LOX) catalyzes the oxidative deamination of lysine residues in tropoelastin, forming cross-links that stabilize the elastic fiber. These cross-links are essential for the fiber's ability to recoil after stretching. Without proper cross-linking, elastic fibers are fragile and non-functional.
Role of Accessory Proteins such as MAGP-2
In simple terms: Helper proteins like MAGP-2 assist in assembling the elastic fiber.
Microfibril-associated glycoprotein-2 (MAGP-2) stimulates elastic fiber assembly by promoting tropoelastin deposition onto microfibrils. MAGP-2 interacts with fibrillin and enhances the assembly process. Other accessory proteins, including fibulins and EMILINs, also contribute to elastic fiber integrity.
Mechanical and Environmental Influences
In simple terms: Physical forces and ventilation can affect how elastic fibers are built.
Mechanical ventilation in neonatal lungs can disrupt elastic fiber assembly, leading to alveolar simplification. Hemodynamic forces in blood vessels influence smooth muscle cell-derived elastic fiber assembly, as shown in three-dimensional vascular models. These mechanical cues are integrated into the assembly process.
Key Genes Involved in GO:0048251 elastic fiber assembly
The following genes and proteins are central to elastic fiber assembly, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ELN | Encodes tropoelastin, the core component of elastic fibers | Mutations cause supravalvular aortic stenosis and cutis laxa |
| FBN1 | Encodes fibrillin-1, a major microfibril component | Mutations cause Marfan syndrome |
| FBN2 | Encodes fibrillin-2, involved in microfibril assembly | Associated with congenital contractural arachnodactyly |
| LOX | Cross-links elastin and collagen | Defects lead to aortic aneurysms and skin laxity |
| MFAP2 | Encodes MAGP-2, stimulates elastic fiber assembly | Knockout impairs elastic fiber formation |
| MFAP5 | Encodes MAGP-1, interacts with fibrillin | Regulates microfibril stability |
| EFEMP1 | Encodes fibulin-3, involved in elastic fiber assembly | Mutations cause retinal degeneration |
| EFEMP2 | Encodes fibulin-4, essential for elastic fiber integrity | Defects cause cutis laxa and aortic aneurysms |
| EMILIN1 | Elastin microfibril interface protein | Regulates elastic fiber assembly in blood vessels |
| LTBP2 | Latent TGF-beta binding protein 2 | Mutations cause glaucoma and cutis laxa |
| LTBP4 | Latent TGF-beta binding protein 4 | Defects lead to cutis laxa and pulmonary emphysema |
| TGFB1 | Regulates extracellular matrix production | Influences elastic fiber assembly via signaling |
| BMP1 | Procollagen C-proteinase, processes tropoelastin | Required for elastic fiber assembly |
| ADAMTS2 | Procollagen N-proteinase | Mutations cause dermatosparaxis |
| COL1A1 | Collagen type I, interacts with elastic fibers | Provides structural support |
| COL3A1 | Collagen type III, co-assembles with elastin | Mutations cause vascular Ehlers-Danlos syndrome |
| SLC2A10 | Glucose transporter, regulates TGF-beta | Mutations cause arterial tortuosity syndrome |
How Is elastic fiber assembly Regulated?
Elastic fiber assembly is regulated at multiple levels, including transcriptional control of ELN and FBN1 by TGF-beta signaling, post-translational modification by lysyl oxidase, and mechanical forces that modulate assembly in vascular and pulmonary tissues. MAGP-2 enhances assembly by promoting tropoelastin deposition. Additionally, microRNAs and extracellular matrix proteases can influence the stability of assembled fibers.
elastic fiber assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ELN | Supravalvular aortic stenosis, cutis laxa | ELN knockout mouse, patient iPSC-derived smooth muscle cells |
| FBN1 | Marfan syndrome | FBN1 knockout mouse, CRISPR knock-in of patient mutations |
| LOX | Aortic aneurysm, skin laxity | LOX knockout mouse, overexpression in fibroblasts |
| EFEMP2 | Cutis laxa, aortic aneurysm | EFEMP2 knockout mouse, 3D vascular model |
| MFAP2 | Elastic fiber assembly defects | MFAP2 knockout mouse, overexpression in cell culture |
Supravalvular Aortic Stenosis and Cutis Laxa
Mutations in ELN cause supravalvular aortic stenosis, characterized by narrowing of the aorta due to defective elastic fiber assembly. Cutis laxa, a connective tissue disorder with loose skin, can result from mutations in ELN, EFEMP2, or LTBP4, all of which impair elastic fiber assembly.
Emphysema and Chronic Obstructive Pulmonary Disease
Impaired elastic fiber assembly in the lung contributes to emphysema, where loss of alveolar elasticity leads to airspace enlargement. Mechanical ventilation can exacerbate this by disrupting assembly in neonates.
Marfan Syndrome and Related Aortopathies
FBN1 mutations cause Marfan syndrome, characterized by aortic aneurysms and skeletal abnormalities due to defective microfibril assembly. Other aortopathies, such as arterial tortuosity syndrome, involve impaired elastic fiber assembly.
From elastic fiber assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate elastic fiber assembly? | CRISPR knockout in human fibroblasts or smooth muscle cells |
| What is the effect of a patient mutation in ELN? | Point mutation knock-in via CRISPR in iPSCs |
| Can wild-type gene rescue assembly defects? | Knock-in of tagged wild-type gene for live imaging |
| Does overexpression of MAGP-2 enhance assembly? | Overexpression of MFAP2 in 3D vascular models |
| Which genes are essential for cross-linking? | CRISPR library screening targeting ECM genes |
| How does mechanical force affect assembly? | 3D vascular model with controlled pulsatile stretch |
How to Study the elastic fiber assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Transmission electron microscopy | Ultrastructure of elastic fibers | Assessing assembly defects in knockout models |
| Mass spectrometry | Protein composition and cross-links | Identifying novel components and validating cross-linking |
| Mechanical testing | Tissue elasticity and recoil | Functional assessment of engineered tissues |
| Immunofluorescence | Localization of elastin and fibrillin | Visualizing assembly in cell culture |
| CRISPR knockout screening | Gene essentiality for assembly | Discovery of novel regulators |
| RNA-seq | Transcriptional changes | Evaluating gene expression during assembly |
| Western blot | Protein expression levels | Validating knockout or overexpression |
| 3D vascular model | Smooth muscle cell-derived assembly | Studying hemodynamic effects |
Ultrastructural Imaging
Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) reveal the ultrastructure of elastic fibers, including microfibril organization and elastin core formation. These methods are critical for assessing assembly defects in knockout models.
Proteomics and Cross-Link Analysis
Mass spectrometry-based proteomics identifies components of elastic fibers and quantifies cross-links such as desmosine and isodesmosine. This approach validates the role of lysyl oxidase and accessory proteins.
Functional Stretch-Recoil Assays
Mechanical testing of tissue or engineered constructs measures elasticity and recoil capacity, providing functional readouts of elastic fiber assembly. These assays are essential for linking molecular changes to tissue mechanics.
CRISPR Screening and Bioinformatics
Genome-wide CRISPR knockout screens combined with bioinformatics can identify novel regulators of elastic fiber assembly. Pathway enrichment and network analysis prioritize candidate genes for functional validation.
How CRISPR Can Be Used to Study GO:0048251 elastic fiber assembly
Knockout
CRISPR knockout of candidate genes such as ELN, FBN1, or LOX in human fibroblasts or smooth muscle cells abolishes elastic fiber assembly, providing causal evidence for their roles. These models are used to study disease mechanisms and test rescue strategies.
Point Mutation
CRISPR point mutation knock-in introduces patient-specific mutations (e.g., in ELN or FBN1) to model diseases like supravalvular aortic stenosis or Marfan syndrome. These models help dissect the impact of single amino acid changes on assembly.
Knock-in
Tagged knock-in of elastin or fibrillin enables live-cell imaging and biochemical tracking of assembly dynamics. Knock-in of wild-type genes can rescue knockout phenotypes, confirming gene function.
Overexpression
Overexpression of accessory proteins such as MAGP-2 (MFAP2) enhances elastic fiber assembly in cell culture and 3D models. Overexpression studies identify rate-limiting steps and potential therapeutic targets.
How EDITGENE Supports elastic fiber assembly Research
Researchers studying elastic fiber assembly-related genes often need to determine whether a candidate gene is causally involved in the assembly process or merely correlated with it. CRISPR-based models provide the gold standard for establishing causality, and EDITGENE offers a comprehensive suite of services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for elastic fiber assembly research.
Frequently Asked Questions About elastic fiber assembly
What is elastic fiber assembly?
Elastic fiber assembly (GO:0048251) is the biological process that builds extracellular matrix fibers enabling tissues to recoil after stretching, involving tropoelastin, fibrillin microfibrils, and cross-linking enzymes.
What genes are involved in elastic fiber assembly?
Key genes include ELN, FBN1, FBN2, LOX, MFAP2, MFAP5, EFEMP1, EFEMP2, EMILIN1, LTBP2, LTBP4, and others.
What diseases are linked to elastic fiber assembly defects?
Defects cause supravalvular aortic stenosis, cutis laxa, Marfan syndrome, emphysema, and arterial tortuosity syndrome.
How is elastic fiber assembly regulated?
It is regulated by TGF-beta signaling, lysyl oxidase cross-linking, mechanical forces, and accessory proteins like MAGP-2.
What methods study elastic fiber assembly?
Electron microscopy, mass spectrometry, mechanical testing, CRISPR screens, and 3D vascular models are commonly used.
What is the role of lysyl oxidase in elastic fiber assembly?
Lysyl oxidase cross-links tropoelastin molecules, stabilizing the elastic fiber for recoil.
Can CRISPR be used to study elastic fiber assembly?
Yes, CRISPR knockout, knock-in, and overexpression models are powerful tools to dissect gene function in this process.
What is MAGP-2 and how does it affect elastic fiber assembly?
MAGP-2 (encoded by MFAP2) stimulates elastic fiber assembly by promoting tropoelastin deposition onto microfibrils.
Why is elastic fiber assembly important for lung function?
It provides alveolar elasticity; impaired assembly leads to emphysema and respiratory failure.
What are the synonyms for elastic fiber assembly?
Synonyms include elastic fibre assembly, elastin fiber assembly, and elastin fibre assembly.
Conclusion
Elastic fiber assembly (GO:0048251) is a fundamental biological process that maintains tissue elasticity and resilience. Its disruption leads to a range of debilitating diseases, underscoring the need for continued research. CRISPR-based models and advanced imaging techniques are invaluable for uncovering the molecular mechanisms and identifying therapeutic targets.
References
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- 3. Shifren A et al.. 2006. The stumbling block in lung repair of emphysema: elastic fiber assembly.. Proc Am Thorac Soc 3(5):428-33 PMID: 16799087
- 4. Urbán Z et al.. 2000. Elastic-fiber pathologies: primary defects in assembly-and secondary disorders in transport and delivery.. Am J Hum Genet 67(1):4-7 PMID: 10841812
- 5. Sawada Y et al.. 2025. Development of a three-dimensional experimental vascular model with smooth muscle cell-derived cross-linked elastic fiber assembly.. Acta Biomater 208:266-279 PMID: 41138823
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- 7. Kielty CM et al.. 2005. Fibrillin microfibrils.. Adv Protein Chem 70:405-36 PMID: 15837522
- 8. Lemaire R et al.. 2007. Microfibril-associated MAGP-2 stimulates elastic fiber assembly.. J Biol Chem 282(1):800-8 PMID: 17099216
