GO:1905315 cell proliferation involved in endocardial cushion morphogenesis: Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905315 describes the subset of cell proliferation that is spatially and temporally restricted to endocardial cushion morphogenesis, a critical step in heart valve and septum formation.
• Endocardial cushion morphogenesis begins with endothelial-to-mesenchymal transition (EndoMT), a process regulated by signaling pathways and transcription factors that also influence proliferation of cushion mesenchyme.
• Retinoic acid signaling is a key regulator of cardiac morphogenesis, including the cellular behaviors that build endocardial cushions.
• The p53-Mdm2-Mdm4 axis is required for normal endocardial cushion morphogenesis, linking cell-cycle control to cushion development.
• YY1 is essential for cardiac morphogenesis, and its loss disrupts multiple steps including cushion formation.
• Serotonin and hyaluronan are among the non-canonical modulators that influence cardiac morphogenesis and cushion cell behavior.
• Msh homeobox genes regulate cadherin-mediated adhesion and cell sorting, processes that are fundamental to cushion cell organization.
Description
GO:1905315, cell proliferation involved in endocardial cushion morphogenesis, is a biological process term that captures the proliferative events specifically required for the formation of endocardial cushions. Endocardial cushions are transient embryonic structures that arise from the endocardium and serve as precursors to heart valves and membranous septa. The term is a child of cell proliferation and is part of the larger program of endocardial cushion morphogenesis, which is essential for proper heart development. Researchers studying congenital heart defects, valve disease, and developmental signaling frequently encounter this term when annotating genes whose functions are tied to cushion cellularity. Understanding GO:1905315 helps clarify how proliferation is integrated with other morphogenetic events such as endothelial-to-mesenchymal transition (EndoMT), cell migration, and differentiation. Because endocardial cushion morphogenesis is a multi-step process, the proliferation component is often studied alongside signaling pathways like retinoic acid, TGF-beta, and Wnt, as well as transcription factors that coordinate cushion growth. The term is therefore a useful annotation target for genes that, when mutated, lead to cushion hypoplasia or hyperplasia and subsequent cardiac malformations.
cell proliferation involved in endocardial cushion morphogenesis At A Glance
| GO ID | GO:1905315 |
|---|---|
| GO term | cell proliferation involved in endocardial cushion morphogenesis |
| Ontology | biological_process |
| Synonym | none |
| Major function | Proliferation of cells that form and expand endocardial cushions during heart development |
| Parent term | cell proliferation |
| Part of | endocardial cushion morphogenesis |
| Related process | endothelial-to-mesenchymal transition (EndoMT) |
| Key regulators | Retinoic acid, p53-Mdm2-Mdm4, YY1, serotonin, hyaluronan, Msh homeobox genes |
What Is GO:1905315?
According to the Gene Ontology, GO:1905315 is defined as any cell proliferation that is involved in endocardial cushion morphogenesis. In other words, it refers to the division and expansion of cells that contribute specifically to the endocardial cushions, rather than proliferation in general. This process is a subcomponent of the broader developmental program that builds the heart's valve and septal structures.
Why Is cell proliferation involved in endocardial cushion morphogenesis Important in Cell Biology?
GO:1905315 is important because endocardial cushion morphogenesis is a prerequisite for proper heart valve and septum formation, and defects in this process are a major cause of congenital heart disease. Cell proliferation within the cushions determines cushion size and cellularity, which in turn affects valve leaflet remodeling and septal closure. Disruption of the signaling pathways and transcription factors that control this proliferation can lead to cushion hypoplasia, valve stenosis, or septal defects. Therefore, understanding the regulation of this specific proliferation event provides mechanistic insight into both normal cardiogenesis and the pathogenesis of structural heart defects.
• Endocardial cushion morphogenesis is essential for heart valve and septum formation; proliferation of cushion cells is a core component.
• EndoMT produces mesenchymal cells that populate the cushions, and their subsequent proliferation is required for cushion expansion.
• Retinoic acid signaling influences cardiac morphogenesis, including the cellular processes that build cushions.
• The p53-Mdm2-Mdm4 pathway is critical for endocardial cushion morphogenesis, linking cell-cycle regulation to cushion development.
• YY1 is required for cardiac morphogenesis, and its loss disrupts cushion formation.
• Serotonin modulates cardiac morphogenesis in mouse embryos, affecting cushion development.
• Hyaluronan is involved in embryogenesis and morphogenesis, including cardiac cushion expansion.
• Msh homeobox genes regulate cadherin-mediated adhesion and cell sorting, which are important for cushion cell organization.
• Dysregulation of cushion cell proliferation can contribute to congenital heart defects such as valve malformations and septal defects.
• Studying GO:1905315 helps identify gene functions relevant to regenerative medicine and valve tissue engineering.
What Happens During cell proliferation involved in endocardial cushion morphogenesis?
Initiation of Endocardial Cushion Formation
In simple terms: The heart tube begins to form cushions that will later become valves and septa.
Endocardial cushion morphogenesis starts when endocardial cells in the atrioventricular canal and outflow tract undergo endothelial-to-mesenchymal transition (EndoMT), delaminate, and invade the underlying extracellular matrix. This initial step is regulated by signaling pathways including TGF-beta, BMP, and Wnt, as well as transcription factors that prepare cells for proliferation and migration. The resulting mesenchymal cells form the cellular core of the cushions, which will subsequently expand through proliferation.
Proliferation of Cushion Mesenchymal Cells
In simple terms: The cushion cells multiply to make the cushions grow bigger.
Once mesenchymal cells populate the cushions, they proliferate to increase cushion volume and cellularity. This proliferation is the specific event described by GO:1905315. It is influenced by growth factors, cell-cycle regulators, and transcription factors. For example, the p53-Mdm2-Mdm4 axis is required for normal endocardial cushion morphogenesis, and disruption of this axis impairs cushion development. YY1 also plays a critical role in cardiac morphogenesis, and its loss leads to cushion defects. The balance between proliferation and apoptosis helps determine final cushion size.
Regulation by Retinoic Acid and Other Signaling Pathways
In simple terms: Vitamin A-derived signals help control how heart cushions grow.
Retinoic acid signaling is a well-known regulator of cardiac morphogenesis, including the cellular behaviors that contribute to cushion formation. Alterations in retinoic acid levels can affect cushion cell proliferation and differentiation, leading to structural heart defects. Other pathways, such as serotonin signaling, also modulate cardiac morphogenesis in mouse embryos, potentially affecting cushion cell proliferation. Hyaluronan, a component of the extracellular matrix, influences embryogenesis and morphogenesis, including cushion expansion.
Cell Adhesion and Sorting in the Cushions
In simple terms: Cells stick together and organize themselves within the cushion.
Msh homeobox genes regulate cadherin-mediated cell adhesion and cell-cell sorting, processes that are important for organizing cushion cells during morphogenesis. Proper adhesion and sorting ensure that proliferating cells remain in the correct location and contribute to the appropriate structures. Disruption of these adhesion mechanisms can lead to abnormal cushion morphology and function.
Integration with Valve and Septum Formation
In simple terms: The growing cushions are remodeled into valves and septa.
After proliferation, the cushions undergo remodeling to form mature valve leaflets and membranous septa. This step involves coordinated changes in cell proliferation, apoptosis, and extracellular matrix remodeling. Defects in the proliferation phase can lead to hypoplastic cushions and subsequent valve or septal defects. Thus, GO:1905315 is a critical early step that sets the stage for later morphogenetic events.
Key Genes Involved in GO:1905315 cell proliferation involved in endocardial cushion morphogenesis
The following genes and proteins have been experimentally linked to endocardial cushion morphogenesis and the proliferation of cushion cells, based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Mdm2 | Regulates p53 stability; required for endocardial cushion morphogenesis | Knockout leads to cushion defects; studied in heart development |
| Mdm4 | Regulates p53 stability; synergizes with Mdm2 in cushion development | Knockout leads to cushion defects; studied in heart development |
| Trp53 | Tumor suppressor; its regulation by Mdm2/Mdm4 is critical for cushion morphogenesis | Dysregulation causes cushion defects; studied in heart development |
| YY1 | Transcription factor essential for cardiac morphogenesis | Knockout causes cushion defects; studied in heart development |
| Rara | Retinoic acid receptor; mediates retinoic acid signaling in heart development | Studied in cardiac morphogenesis and cushion formation |
| Rarb | Retinoic acid receptor; mediates retinoic acid signaling in heart development | Studied in cardiac morphogenesis and cushion formation |
| Tgfbr1 | TGF-beta receptor; regulates EndoMT and cushion cell proliferation | Studied in EndoMT and cushion development |
| Tgfbr2 | TGF-beta receptor; regulates EndoMT and cushion cell proliferation | Studied in EndoMT and cushion development |
| Bmp2 | BMP ligand; promotes EndoMT and cushion formation | Studied in cushion morphogenesis |
| Bmp4 | BMP ligand; promotes EndoMT and cushion formation | Studied in cushion morphogenesis |
| Notch1 | Signaling receptor; regulates EndoMT and cushion development | Studied in EndoMT and cushion development |
| Snai1 | Transcription factor; induces EndoMT | Studied in EndoMT and cushion development |
| Snai2 | Transcription factor; induces EndoMT | Studied in EndoMT and cushion development |
| Tbx2 | Transcription factor; regulates cushion formation | Studied in cardiac morphogenesis |
| Tbx3 | Transcription factor; regulates cushion formation | Studied in cardiac morphogenesis |
| Msx1 | Homeobox gene; regulates cadherin-mediated adhesion and cell sorting | Studied in cell adhesion and sorting |
| Msx2 | Homeobox gene; regulates cadherin-mediated adhesion and cell sorting | Studied in cell adhesion and sorting |
| Htr2b | Serotonin receptor; modulates cardiac morphogenesis | Studied in mouse embryonic heart development |
How Is cell proliferation involved in endocardial cushion morphogenesis Regulated?
The proliferation of cells involved in endocardial cushion morphogenesis is regulated by a complex network of signaling pathways and transcription factors. Retinoic acid signaling is a key regulator of cardiac morphogenesis, influencing cushion cell proliferation and differentiation. The p53-Mdm2-Mdm4 axis is critical for endocardial cushion morphogenesis, and its disruption leads to impaired cushion development, indicating that cell-cycle control is tightly linked to this process. YY1, a multifunctional transcription factor, is also essential for cardiac morphogenesis, and its loss results in cushion defects. Serotonin signaling modulates cardiac morphogenesis in mouse embryos, potentially affecting cushion cell proliferation. Hyaluronan, a major extracellular matrix component, influences embryogenesis and morphogenesis, including cushion expansion. Additionally, Msh homeobox genes regulate cadherin-mediated adhesion and cell sorting, which are important for organizing proliferating cushion cells. Together, these regulators ensure that proliferation is coordinated with other morphogenetic events.
cell proliferation involved in endocardial cushion morphogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Mdm2 | Congenital heart defects; cushion hypoplasia | Knockout mouse, conditional knockout |
| Mdm4 | Congenital heart defects; cushion hypoplasia | Knockout mouse, conditional knockout |
| YY1 | Cardiac morphogenesis defects; cushion abnormalities | Knockout mouse |
| Rara | Retinoic acid-related cardiac malformations | Knockout mouse, pharmacological models |
| Htr2b | Serotonin-related cardiac morphogenesis defects | Knockout mouse |
Congenital Heart Defects
Disruption of cell proliferation involved in endocardial cushion morphogenesis can lead to congenital heart defects such as valve stenosis, valve regurgitation, and septal defects. For example, loss of Mdm2 or Mdm4 function in mice causes endocardial cushion defects, highlighting the importance of the p53 regulatory axis in heart development. Similarly, YY1 deficiency leads to cardiac morphogenesis defects, including cushion abnormalities. These findings suggest that mutations in genes regulating cushion cell proliferation may contribute to human congenital heart disease.
Valve Disease
Proper endocardial cushion morphogenesis is essential for the formation of heart valves. Defects in cushion cell proliferation can result in malformed or dysfunctional valves, which may present as congenital valve disease or contribute to adult valve pathologies. Understanding the molecular mechanisms of cushion cell proliferation may inform strategies for valve repair or tissue engineering.
Retinoic Acid-Related Teratogenesis
Altered retinoic acid signaling during embryogenesis can cause a spectrum of cardiac malformations, including cushion defects. Retinoic acid is a known teratogen, and its excess or deficiency disrupts cardiac morphogenesis. This highlights the sensitivity of endocardial cushion morphogenesis to environmental and nutritional factors.
From cell proliferation involved in endocardial cushion morphogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate cushion cell proliferation? | Knockout mouse (global or conditional) |
| Does a point mutation in gene X affect cushion morphogenesis? | Point-mutation knock-in mouse |
| Does overexpression of gene X alter cushion size? | Transgenic overexpression mouse |
| Where is gene X expressed during cushion development? | Tagged knock-in reporter mouse |
| Does gene X interact with signaling pathways in cushion cells? | Primary cushion cell culture, explant assays |
| Can gene X rescue cushion defects in a mutant background? | Rescue experiments with knock-in or overexpression |
How to Study the cell proliferation involved in endocardial cushion morphogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression | Identify pathways regulating cushion proliferation |
| Single-cell RNA-seq | Cell-type-specific expression | Resolve cushion cell heterogeneity |
| EdU/Ki67 staining | Cell proliferation | Quantify proliferation in cushions |
| Lineage tracing | Cell fate | Track cushion cell descendants |
| ChIP-seq | Protein-DNA interactions | Identify transcription factor targets |
| Co-immunoprecipitation | Protein-protein interactions | Study p53-Mdm2-Mdm4 complex |
| Pharmacological treatment | Pathway activity | Modulate retinoic acid signaling |
| Genetically engineered mice | Gene function in vivo | Test requirement for cushion proliferation |
Transcriptomic Profiling
RNA sequencing (RNA-seq) of microdissected endocardial cushions or sorted cushion cells can identify genes differentially expressed during proliferation. This approach helps pinpoint pathways and transcription factors that regulate GO:1905315. Single-cell RNA-seq can resolve heterogeneity among cushion cell populations and identify proliferating subpopulations.
Imaging and Lineage Tracing
Confocal imaging of proliferation markers (e.g., EdU, Ki67) in embryonic hearts can quantify cell proliferation within cushions. Lineage tracing using Cre-lox systems can track the fate of proliferating cushion cells. These methods provide spatial and temporal resolution of GO:1905315.
Genetic and Pharmacological Perturbation
Knockout, knock-in, and transgenic mouse models are used to test the requirement of specific genes in cushion cell proliferation. Pharmacological inhibitors or activators of signaling pathways (e.g., retinoic acid, TGF-beta) can modulate the process acutely. These experiments establish causality.
Proteomic and Biochemical Assays
Proteomics, co-immunoprecipitation, and chromatin immunoprecipitation (ChIP) can reveal protein interactions and transcriptional regulation relevant to cushion cell proliferation. For example, ChIP-seq for YY1 or p53 in cushion cells can identify direct target genes.
How CRISPR Can Be Used to Study GO:1905315 cell proliferation involved in endocardial cushion morphogenesis
Knockout
CRISPR-Cas9 knockout of candidate genes in mouse embryos or cell lines can test their requirement for cell proliferation involved in endocardial cushion morphogenesis. For example, knocking out Mdm2 or Mdm4 in cushion cells would be expected to impair proliferation and cushion development, based on prior knockout studies. Knockout models help establish loss-of-function phenotypes.
Point Mutation
CRISPR-mediated point mutations can model specific amino acid changes identified in human congenital heart disease or in functional domains of key regulators. For instance, point mutations in p53 that affect its interaction with Mdm2/Mdm4 could be introduced to study their impact on cushion morphogenesis. This approach provides allele-specific insights.
Knock-in
Knock-in of reporter genes (e.g., GFP, lacZ) or epitope tags into endogenous loci allows visualization and biochemical analysis of proteins involved in cushion cell proliferation. Tagged knock-in of YY1 or Mdm2 would enable ChIP-seq and co-IP studies in cushion cells. Knock-in can also be used to express mutant alleles under endogenous regulatory control.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression can test gain-of-function effects on cushion cell proliferation. Overexpressing a candidate gene in the endocardium or cushion mesenchyme may increase proliferation and alter cushion size. This complements loss-of-function studies.
How EDITGENE Supports cell proliferation involved in endocardial cushion morphogenesis Research
Researchers studying cell proliferation involved in endocardial cushion morphogenesis-related genes often need to determine whether a candidate gene is causally involved in cushion cell proliferation, and to dissect its mechanism of action. This requires precise genetic tools that can knock out, mutate, tag, or overexpress genes in relevant cell types and model organisms.
Contact EDITGENE today to design your custom CRISPR model for cell proliferation involved in endocardial cushion morphogenesis research.
Frequently Asked Questions About cell proliferation involved in endocardial cushion morphogenesis
What is GO:1905315?
GO:1905315 is a Gene Ontology biological process term defined as any cell proliferation that is involved in endocardial cushion morphogenesis. It describes the proliferation of cells that form the endocardial cushions during heart development.
What genes are involved in cell proliferation involved in endocardial cushion morphogenesis?
Key genes include Mdm2, Mdm4, Trp53, YY1, retinoic acid receptors (Rara, Rarb), TGF-beta pathway components, BMP ligands, Notch1, Snai1/2, Tbx2/3, Msx1/2, and Htr2b, based on experimental studies.
Why is endocardial cushion morphogenesis important?
Endocardial cushions are precursors to heart valves and membranous septa. Defects in their formation can lead to congenital heart defects such as valve stenosis and septal defects.
How is cell proliferation regulated during endocardial cushion morphogenesis?
It is regulated by signaling pathways including retinoic acid, TGF-beta, BMP, Wnt, and Notch, as well as transcription factors like YY1 and p53-Mdm2-Mdm4. These regulators coordinate proliferation with other morphogenetic events.
What diseases are associated with defects in endocardial cushion morphogenesis?
Congenital heart defects, including valve malformations and septal defects, are associated with disrupted cushion morphogenesis. Mutations in genes such as Mdm2, Mdm4, and YY1 cause cushion defects in animal models.
What model systems are used to study GO:1905315?
Mouse models (knockout, knock-in, transgenic), primary cushion cell cultures, and explant assays are commonly used. CRISPR-Cas9 genome editing enables precise genetic perturbations.
How can CRISPR be used to study cell proliferation in endocardial cushions?
CRISPR can create knockout, point mutation, knock-in, and overexpression models in mice or cell lines to test gene function in cushion cell proliferation. It can also be used for library screens to identify novel regulators.
What is the role of retinoic acid in endocardial cushion morphogenesis?
Retinoic acid signaling is a key regulator of cardiac morphogenesis, influencing cushion cell proliferation and differentiation. Disruption of retinoic acid signaling causes cardiac malformations.
What is the role of p53 in endocardial cushion morphogenesis?
The p53 tumor suppressor is regulated by Mdm2 and Mdm4, and this axis is critical for endocardial cushion morphogenesis. Loss of Mdm2/Mdm4 leads to cushion defects.
How does YY1 affect heart development?
YY1 is a transcription factor essential for cardiac morphogenesis. Its loss in mice causes cushion defects and other cardiac abnormalities.
Conclusion
GO:1905315, cell proliferation involved in endocardial cushion morphogenesis, represents a critical developmental process that bridges cell-cycle control and heart morphogenesis. Research using mouse genetics, signaling pathway analysis, and CRISPR-based editing has identified key regulators such as retinoic acid, p53-Mdm2-Mdm4, YY1, serotonin, hyaluronan, and Msh homeobox genes. Understanding this process provides insight into congenital heart disease and may inform regenerative strategies for valve repair. Continued investigation using advanced models and CRISPR screens will further elucidate the molecular networks controlling cushion cell proliferation.
References
- 1. Miquerol L et al.. 2013. Organogenesis of the vertebrate heart.. Wiley Interdiscip Rev Dev Biol 2(1):17-29 PMID: 23799628
- 2. Wang J et al.. 2026. The regulation of endothelial-to-mesenchymal transition in endocardial cushion development: Signaling pathways and transcription factors.. Differentiation 151:100987 PMID: 42600378
- 3. Pan J et al.. 2007. Retinoic acid and the heart.. Vitam Horm 75:257-83 PMID: 17368319
- 4. Zhang Q et al.. 2012. Synergistic regulation of p53 by Mdm2 and Mdm4 is critical in cardiac endocardial cushion morphogenesis during heart development.. J Pathol 228(3):416-28 PMID: 22821713
- 5. Beketaev I et al.. 2015. Critical role of YY1 in cardiac morphogenesis.. Dev Dyn 244(5):669-80 PMID: 25703143
- 6. Yavarone MS et al.. 1993. Serotonin and cardiac morphogenesis in the mouse embryo.. Teratology 47(6):573-84 PMID: 8367830
- 7. Vabres P. 2010. [Hyaluronan, embryogenesis and morphogenesis].. Ann Dermatol Venereol 137 Suppl 1:S9-S14 PMID: 20435256
- 8. Lincecum JM et al.. 1998. Msh homeobox genes regulate cadherin-mediated cell adhesion and cell-cell sorting.. J Cell Biochem 70(1):22-8 PMID: 9632104
