GO:1905316 superior endocardial cushion morphogenesis: Heart Valve Development, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905316 (superior endocardial cushion morphogenesis) is the developmental process that builds the dorsal/superior endocardial cushion, a precursor structure of the atrioventricular septal complex and valves.
• The superior endocardial cushion is a transient mesenchymal tissue formed by endocardial cells that undergo endothelial-to-mesenchymal transition and invade the cardiac jelly.
• Defects in superior endocardial cushion morphogenesis are linked to atrioventricular septal defects and trisomy 16-associated heart malformations in mouse models.
• Lineage tracing and morphogenetic analyses have shown that endocardial cushion cells contribute to valve leaflets and septal structures.
• Human studies of tricuspid valve and tendon of Todaro development provide anatomical context for superior cushion derivatives.
• CRISPR-based knockout, knock-in, and overexpression models in mice, avian embryos, and cell lines are key tools for dissecting superior endocardial cushion morphogenesis.
Description
Superior endocardial cushion morphogenesis (GO:1905316) is the developmental process by which the superior (dorsal) endocardial cushion is generated and organized. This cushion is a critical transient structure in the embryonic heart, forming part of the atrioventricular septal complex and contributing to valve and septal development. Understanding this process is essential because disruptions in endocardial cushion formation underlie congenital heart defects such as atrioventricular septal defects. The superior endocardial cushion is populated by endocardial cells that delaminate, undergo endothelial-to-mesenchymal transition, and invade the cardiac jelly, a process that has been studied in mouse and avian models. Lineage and morphogenetic analyses have clarified how cushion cells contribute to valve leaflets and septal structures. Human anatomical studies of tricuspid valve and tendon of Todaro development provide complementary insights into the derivatives of these cushions. Researchers studying GO:1905316 aim to understand the cellular and molecular mechanisms that pattern this cushion, with implications for diagnosing and modeling congenital heart disease.
superior endocardial cushion morphogenesis At A Glance
| GO ID | GO:1905316 |
|---|---|
| GO term | superior endocardial cushion morphogenesis |
| Ontology | biological_process |
| Synonym | dorsal endocardial cushion morphogenesis |
| Definition | The developmental process by which a superior endocardial cushion is generated and organized. |
| Major function | Formation and organization of the superior (dorsal) endocardial cushion, a precursor to atrioventricular septal structures and valves. |
| Related structures | Atrioventricular septal complex, tricuspid valve, tendon of Todaro |
| Associated defects | Atrioventricular septal defects, trisomy 16-associated heart malformations |
| Model organisms | Mouse, avian embryos |
What Is GO:1905316?
GO:1905316, superior endocardial cushion morphogenesis, is defined as the developmental process by which a superior endocardial cushion is generated and organized. This process encompasses the formation, cellular reorganization, and shaping of the dorsal endocardial cushion, a mesenchymal structure derived from endocardial cells that contributes to the atrioventricular septal complex and cardiac valves.
Why Is superior endocardial cushion morphogenesis Important in Cell Biology?
Superior endocardial cushion morphogenesis is important because it is a fundamental step in building the atrioventricular septal complex and cardiac valves. Defects in this process are associated with congenital heart malformations such as atrioventricular septal defects, which are clinically significant. Mouse models, including trisomy 16, have linked abnormal endocardial cushion development to heart loop architecture defects. Understanding the cellular and molecular regulation of this cushion is therefore critical for uncovering the etiology of congenital heart disease and for developing experimental models.
• Provides the developmental basis for the atrioventricular septal complex and valve formation.
• Disruption leads to atrioventricular septal defects, a common congenital heart malformation.
• Trisomy 16 mouse models show endocardial cushion abnormalities linked to heart loop defects.
• Lineage tracing reveals cushion cells contribute to valve leaflets and septa.
• Human anatomical studies of tricuspid valve and tendon of Todaro development inform cushion derivatives.
• Avian models allow noninvasive manipulation of cardiogenesis for functional studies.
• Ellis-van Creveld syndrome cases include congenital heart defects, highlighting clinical relevance.
• CRISPR-based models enable causal testing of candidate genes in cushion morphogenesis.
What Happens During superior endocardial cushion morphogenesis?
Formation of the endocardial cushion
In simple terms: The heart tube develops a jelly-like cushion that will later become part of the heart's valves and septa.
The superior endocardial cushion forms as endocardial cells in the atrioventricular canal region delaminate and invade the cardiac jelly, creating a mesenchymal cushion. This process is a key early step in heart morphogenesis and is conserved in mouse and avian embryos.
Endothelial-to-mesenchymal transition
In simple terms: Cells lining the heart change into a type that can move and build new structures.
Endocardial cells undergo endothelial-to-mesenchymal transition (EndMT), losing endothelial markers and gaining mesenchymal properties, which allows them to populate the cushion. Lineage analysis has shown that these cells subsequently contribute to valve and septal tissues.
Cushion organization and remodeling
In simple terms: The cushion is reshaped into more defined structures that will become valves and septa.
After formation, the superior endocardial cushion is organized and remodeled, with cells arranging into patterns that prefigure the atrioventricular septal complex. Morphogenetic studies in mouse and human have detailed how these cushions contribute to the tricuspid valve and tendon of Todaro.
Integration with heart loop architecture
In simple terms: The cushion develops in coordination with the heart tube as it loops and twists.
Endocardial cushion development is closely linked to heart loop architecture; in trisomy 16 mice, abnormal cushion formation correlates with altered heart looping. This integration ensures proper alignment of septal and valvular structures.
Key Genes Involved in GO:1905316 superior endocardial cushion morphogenesis
The following genes and proteins have been implicated in endocardial cushion development and related congenital heart defects based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Nkx2-5 | Cardiac transcription factor | Studied in endocardial cushion and heart loop development |
| Tbx5 | Transcription factor in heart development | Associated with atrioventricular septal defects |
| GATA4 | Cardiac transcription factor | Linked to endocardial cushion and valve formation |
| Mef2c | Transcription factor | Involved in cardiac morphogenesis |
| Vegf | Signaling molecule | Regulates EndMT in cushions |
| Notch1 | Signaling receptor | Controls EndMT and cushion formation |
| Tgfbr2 | TGF-beta receptor | Mediates EndMT in endocardial cushions |
| Bmp2 | Bone morphogenetic protein | Induces cushion mesenchyme |
| Bmp4 | Bone morphogenetic protein | Involved in cushion remodeling |
| Sox9 | Transcription factor | Expressed in valve precursors |
| Wnt/beta-catenin | Signaling pathway | Regulates cushion cell proliferation |
| Periostin | Extracellular matrix protein | Expressed in cushion mesenchyme |
| Versican | Extracellular matrix proteoglycan | Major component of cardiac jelly |
| Hyaluronan | Extracellular matrix component | Essential for cushion expansion |
| E-cadherin | Cell adhesion molecule | Lost during EndMT |
| N-cadherin | Cell adhesion molecule | Gained during EndMT |
| Snail | Transcription factor | Induces EndMT |
| Slug | Transcription factor | Promotes mesenchymal phenotype |
How Is superior endocardial cushion morphogenesis Regulated?
The regulation of superior endocardial cushion morphogenesis involves signaling pathways such as TGF-beta, BMP, Notch, and Wnt, which control endothelial-to-mesenchymal transition and cushion cell behavior. These pathways are modulated by transcription factors including Nkx2-5, GATA4, and Tbx5, which are critical for heart development. In trisomy 16 mouse models, altered gene dosage affects cushion formation and heart looping.
superior endocardial cushion morphogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Nkx2-5 | Congenital heart defects | Knockout mouse |
| Tbx5 | Atrioventricular septal defects | Point mutation knock-in mouse |
| GATA4 | Septal defects | Overexpression in cell line |
| Notch1 | Valve disease | Knockout mouse |
| Bmp2 | Cushion defects | Conditional knockout mouse |
Atrioventricular septal defects
Atrioventricular septal defects are congenital heart malformations that arise from abnormal development of the endocardial cushions, including the superior cushion. Developmental studies in human and mouse have linked these defects to disrupted cushion morphogenesis.
Trisomy 16-associated heart malformations
The trisomy 16 mouse model exhibits endocardial cushion abnormalities and altered heart loop architecture, providing insights into congenital heart defects associated with chromosomal abnormalities.
Ellis-van Creveld syndrome
Ellis-van Creveld syndrome is a ciliopathy that includes congenital heart defects, and case studies have documented cardiac anomalies potentially related to endocardial cushion development.
Tricuspid valve anomalies
Human studies of tricuspid valve formation have detailed the contribution of endocardial cushions to valve leaflets, linking cushion morphogenesis to valve disease.
From superior endocardial cushion morphogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate superior cushion formation? | Knockout mouse |
| Does a point mutation in gene Y cause septal defects? | Point mutation knock-in mouse |
| Can we tag a cushion marker for lineage tracing? | Tagged knock-in mouse |
| Does overexpression of gene Z expand the cushion? | Overexpression transgenic mouse |
| What is the effect of gene W on EndMT? | Avian embryo photoablation |
| Can we screen for modifiers of cushion morphogenesis? | CRISPR library screening in cell lines |
How to Study the superior endocardial cushion morphogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lineage tracing | Cell fate and contribution | Determine cushion derivatives |
| Two-photon microscopy | Live imaging of cardiogenesis | Photoablation in avian embryos |
| Histology | Tissue structure | Human embryonic heart studies |
| In situ hybridization | Gene expression patterns | Cushion marker localization |
| Immunofluorescence | Protein localization | EndMT marker analysis |
| RNA-seq | Transcriptome profiling | Cushion cell gene expression |
| CRISPR knockout | Gene function | Causal testing in mouse |
| Morpholino knockdown | Gene knockdown | Avian embryo studies |
Lineage tracing and morphogenetic analysis
Lineage tracing using genetic markers allows researchers to follow the fate of endocardial cushion cells and determine their contribution to valves and septa. Morphogenetic analysis in mouse and avian embryos provides spatial and temporal resolution of cushion development.
Two-photon microscopy and photoablation
Two-photon microscopy-guided femtosecond-laser photoablation enables noninvasive creation of localized heart defects in avian embryos, allowing functional studies of cushion morphogenesis.
Human anatomical and histological studies
Detailed anatomical studies of human embryonic and fetal hearts, such as those on tricuspid valve and tendon of Todaro development, provide essential baseline data for understanding cushion derivatives.
Genetic mouse models
Mouse models, including trisomy 16 and targeted knockouts, are used to dissect the genetic control of endocardial cushion morphogenesis and associated heart defects.
How CRISPR Can Be Used to Study GO:1905316 superior endocardial cushion morphogenesis
Knockout
CRISPR knockout of candidate genes in mouse or cell lines can test their requirement for superior endocardial cushion morphogenesis, as demonstrated for genes like Nkx2-5 and Notch1.
Point Mutation
Introducing point mutations via CRISPR knock-in allows modeling of specific human variants associated with atrioventricular septal defects, such as those in Tbx5.
Knock-in
Tagged knock-in of fluorescent reporters or lineage markers enables visualization and tracking of cushion cells during development.
Overexpression
CRISPR activation or transgenic overexpression can test gain-of-function effects of genes like GATA4 or Bmp2 on cushion expansion and remodeling.
How EDITGENE Supports superior endocardial cushion morphogenesis Research
Researchers studying superior endocardial cushion morphogenesis-related genes often need to determine whether a candidate gene is causally involved in cushion formation, remodeling, or associated congenital heart defects. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell and animal models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for superior endocardial cushion morphogenesis research.
Frequently Asked Questions About superior endocardial cushion morphogenesis
What is superior endocardial cushion morphogenesis?
It is the developmental process by which the superior (dorsal) endocardial cushion is generated and organized, as defined by GO:1905316.
What genes are involved in superior endocardial cushion morphogenesis?
Genes such as Nkx2-5, Tbx5, GATA4, Notch1, and Bmp2 have been implicated in endocardial cushion development and related heart defects.
What is the role of the superior endocardial cushion in heart development?
It contributes to the atrioventricular septal complex and cardiac valves, including the tricuspid valve.
How is superior endocardial cushion morphogenesis studied?
Researchers use mouse and avian models, lineage tracing, two-photon microscopy, and CRISPR-based genetic manipulation.
What diseases are associated with defects in superior endocardial cushion morphogenesis?
Atrioventricular septal defects and other congenital heart malformations are linked to abnormal cushion development.
What is the synonym for GO:1905316?
The synonym is dorsal endocardial cushion morphogenesis.
Which model organisms are used to study superior endocardial cushion morphogenesis?
Mouse and avian embryos are commonly used.
What is endothelial-to-mesenchymal transition in the context of this cushion?
It is the process by which endocardial cells transform into mesenchymal cells that populate the cushion.
Can CRISPR be used to study superior endocardial cushion morphogenesis?
Yes, CRISPR knockout, knock-in, and overexpression models enable functional testing of candidate genes.
What are the derivatives of the superior endocardial cushion?
Derivatives include parts of the atrioventricular septal complex, tricuspid valve, and tendon of Todaro.
Conclusion
Superior endocardial cushion morphogenesis (GO:1905316) is a critical developmental process that builds the dorsal endocardial cushion, a precursor to atrioventricular septal structures and cardiac valves. Disruptions in this process are linked to congenital heart defects such as atrioventricular septal defects. Continued research using CRISPR models and advanced imaging will further elucidate the genetic and cellular mechanisms governing this process.
References
- 1. Webb S et al.. 1996. Endocardial cushion development and heart loop architecture in the trisomy 16 mouse.. Dev Dyn 206(3):301-9 PMID: 8896985
- 2. Lamers WH et al.. 1995. Formation of the tricuspid valve in the human heart.. Circulation 91(1):111-21 PMID: 7805192
- 3. Wenink AC et al.. 1988. Developmental aspects of atrioventricular septal defects.. Int J Cardiol 18(1):65-78 PMID: 3343065
- 4. Yalcin HC et al.. 2010. Two-photon microscopy-guided femtosecond-laser photoablation of avian cardiogenesis: noninvasive creation of localized heart defects.. Am J Physiol Heart Circ Physiol 299(5):H1728-35 PMID: 20709864
- 5. Webb S et al.. 1998. Formation of the atrioventricular septal structures in the normal mouse.. Circ Res 82(6):645-56 PMID: 9546373
- 6. de Lange FJ et al.. 2004. Lineage and morphogenetic analysis of the cardiac valves.. Circ Res 95(6):645-54 PMID: 15297379
- 7. Hills CB et al.. 2011. Ellis-van Creveld syndrome and congenital heart defects: presentation of an additional 32 cases.. Pediatr Cardiol 32(7):977-82 PMID: 21533779
- 8. Domènech-Mateu JM et al.. 1994. Development of the tendon of Todaro during the human embryonic and fetal periods.. Anat Rec 238(3):374-82 PMID: 8179219
