GO:0003185 sinoatrial valve morphogenesis: Development, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0003185 sinoatrial valve morphogenesis is the biological process that generates and organizes the sinoatrial (SA) valve, a critical structure at the junction of the sinus venosus and the atrium.
• Endocardial NOTCH1 signaling is a master regulator of sinus venosus valve and sinoatrial node development, linking valve morphogenesis to pacemaker formation.
• The transcription factor Shox2 is essential for sinoatrial and pacemaking development, and its mutation disrupts SA valve morphogenesis.
• Hedgehog signaling controls sinoatrial node development and atrioventricular cushion formation, implicating it in SA valve morphogenesis.
• Translational control of furina by an RNA regulon is required for left-right patterning, heart morphogenesis, and cardiac valve function, including the SA valve.
• Defects in SA valve morphogenesis are linked to abnormal atrial automaticity and arrhythmogenic areas in the adult heart [5,8].
Description
The sinoatrial (SA) valve, also known as the sinus venosus valve, is an embryonic structure that forms at the junction between the sinus venosus and the primitive atrium. Its morphogenesis, defined by GO:0003185, is the process in which the structure of the sinoatrial valve is generated and organized. This process is critical for proper cardiac development and for establishing the conduction system that controls heart rhythm [1,5]. In humans and other vertebrates, the SA valve contributes to the formation of the sinoatrial node and the venous pole of the heart, and its malformation is associated with congenital arrhythmias and abnormal atrial automaticity. Research into sinoatrial valve morphogenesis has revealed a complex interplay of signaling pathways and transcription factors. Endocardial NOTCH1 signaling controls both sinus venosus valve and sinoatrial node development, highlighting a shared molecular program. The homeodomain transcription factor Shox2 is essential for sinoatrial and pacemaking development, and its targeted mutation in mice leads to severe defects in SA valve morphogenesis. Hedgehog signaling also plays a role in sinoatrial node development and atrioventricular cushion formation, suggesting broader involvement in valve morphogenesis. Additionally, translational control of furina by an RNA regulon is important for left-right patterning, heart morphogenesis, and cardiac valve function, including the SA valve. Understanding GO:0003185 is important for researchers studying congenital heart defects, arrhythmias, and the evolutionary origins of the conduction system. The SA valve is a key anatomical landmark that correlates with adult arrhythmogenic areas, making it a relevant model for understanding abnormal atrial automaticity. This article synthesizes current knowledge on the genes, mechanisms, and research methods used to study sinoatrial valve morphogenesis, providing a resource for both human readers and AI-driven retrieval systems.
sinoatrial valve morphogenesis At A Glance
| GO ID | GO:0003185 |
|---|---|
| GO term | sinoatrial valve morphogenesis |
| Ontology | biological_process |
| Synonym | SA valve morphogenesis |
| Major function | Generation and organization of the sinoatrial valve structure during heart development |
| Related anatomy | Sinus venosus, primitive atrium, sinoatrial junction |
| Key signaling pathways | NOTCH1, Hedgehog, Shox2-dependent transcriptional programs |
| Associated diseases | Congenital arrhythmias, abnormal atrial automaticity, conduction system defects |
What Is GO:0003185?
GO:0003185 sinoatrial valve morphogenesis is the biological process in which the structure of the sinoatrial valve is generated and organized. This includes the coordinated cellular behaviors, tissue interactions, and genetic programs that shape the valve during embryonic development. The term is synonymous with SA valve morphogenesis and falls under the biological_process ontology aspect.
Why Is sinoatrial valve morphogenesis Important in Cell Biology?
Sinoatrial valve morphogenesis is important because the SA valve is a critical component of the embryonic heart that contributes to the formation of the sinoatrial node and the conduction system. Defects in this process can lead to congenital heart defects, arrhythmias, and abnormal atrial automaticity [1,5,8]. Studying GO:0003185 provides insights into the molecular mechanisms of heart development and may inform regenerative strategies for cardiac conduction disorders.
• The SA valve is essential for proper separation of the sinus venosus and atrium, influencing blood flow and heart rhythm.
• NOTCH1 signaling in the endocardium controls both SA valve and sinoatrial node development, linking valve morphogenesis to pacemaker function.
• Shox2 mutations disrupt SA valve morphogenesis and cause severe pacemaking defects, highlighting its role in conduction system development.
• Hedgehog signaling regulates sinoatrial node development and atrioventricular cushion formation, suggesting a broader role in valve morphogenesis.
• Translational control of furina by an RNA regulon is required for cardiac valve function, including the SA valve.
• Abnormal SA valve development is associated with arrhythmogenic areas in the adult heart, relevant to atrial fibrillation and other arrhythmias.
• The SA valve serves as a model for understanding the evolutionary origins of the cardiac conduction system.
• Human embryonic studies using HNK-1 antigen expression reveal the development of cardiac conduction tissue, including the SA valve region.
• Zebrafish atrioventricular canal analyses provide molecular building blocks of the secondary pacemaker region, relevant to SA valve research.
• Understanding SA valve morphogenesis may aid in developing therapies for congenital heart block and sinus node dysfunction.
What Happens During sinoatrial valve morphogenesis?
Endocardial NOTCH1 signaling initiates SA valve development
In simple terms: NOTCH1 signaling in the inner lining of the heart triggers the formation of the sinoatrial valve.
Endocardial NOTCH1 signaling is a key initiator of sinus venosus valve and sinoatrial node development. In mice, conditional deletion of Notch1 in the endocardium leads to defective SA valve morphogenesis and impaired sinoatrial node formation. This signaling pathway coordinates the expression of downstream targets that drive cellular changes required for valve formation.
Shox2-dependent transcriptional regulation
In simple terms: The Shox2 gene acts as a master switch that controls the development of the sinoatrial valve and pacemaker cells.
The homeodomain transcription factor Shox2 is essential for sinoatrial and pacemaking development. Targeted mutation of Shox2 in mice results in severe defects in SA valve morphogenesis and loss of pacemaker function. Shox2 regulates a network of genes involved in conduction system development, and its expression is required for the proper patterning of the SA valve region.
Hedgehog signaling in sinoatrial node and valve formation
In simple terms: Hedgehog signaling helps build both the sinoatrial node and the cushions that form heart valves.
Hedgehog signaling controls sinoatrial node development and atrioventricular cushion formation. Perturbation of Hedgehog signaling in zebrafish and mice leads to defects in these structures, suggesting its involvement in SA valve morphogenesis. This pathway may interact with NOTCH1 and Shox2 to coordinate valve and node development.
Translational control by RNA regulons
In simple terms: RNA regulons control when and how much protein is made from genes needed for heart valve formation.
Translational control of furina by an RNA regulon is important for left-right patterning, heart morphogenesis, and cardiac valve function. Disruption of this regulon in zebrafish leads to cardiac valve defects, including the SA valve. This highlights the role of post-transcriptional regulation in SA valve morphogenesis.
Contribution of the secondary pacemaker region
In simple terms: The atrioventricular canal contains molecular building blocks that contribute to the secondary pacemaker region, similar to the SA valve.
Genomic and physiological analyses of the zebrafish atrioventricular canal reveal molecular building blocks of the secondary pacemaker region, which shares developmental origins with the SA valve. These findings suggest that common molecular programs underlie the formation of pacemaker and valve structures.
Key Genes Involved in GO:0003185 sinoatrial valve morphogenesis
The following genes and proteins have been experimentally implicated in sinoatrial valve morphogenesis and related developmental processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NOTCH1 | Endocardial signaling receptor controlling sinus venosus valve and sinoatrial node development | Conditional knockout models reveal SA valve defects |
| SHOX2 | Homeodomain transcription factor essential for sinoatrial and pacemaking development | Targeted mutation causes SA valve morphogenesis defects |
| FURINA | Proprotein convertase regulated by an RNA regulon; required for cardiac valve function | Translational control affects left-right patterning and valve formation |
| GLI1 | Hedgehog signaling effector involved in sinoatrial node development | Hedgehog pathway manipulation affects SA node and cushion formation |
| GLI2 | Hedgehog signaling effector | Implicated in atrioventricular cushion formation |
| PTCH1 | Hedgehog receptor | Regulates Hedgehog signaling in heart development |
| HNK-1 | Carbohydrate epitope marking conduction tissue | Used to study human cardiac conduction tissue development |
| TBX3 | Transcription factor marking the sinoatrial node and conduction system | Expressed in SA valve region during development |
| TBX2 | Transcription factor involved in chamber specification | May interact with SA valve morphogenesis |
| NKX2-5 | Cardiac transcription factor | Mutations cause conduction defects and may affect SA valve |
| HCN4 | Ion channel underlying pacemaker current | Expressed in SA node and valve region |
| CAV1.3 | L-type calcium channel | Contributes to pacemaker function in SA node |
| ISL1 | Transcription factor in cardiac progenitors | Marks cells contributing to SA valve and node |
| PITX2 | Left-right patterning transcription factor | Mutations cause atrial fibrillation and may affect SA valve |
| BMP2 | Signaling ligand in cushion formation | Involved in atrioventricular cushion and valve development |
| BMP4 | Signaling ligand in heart development | Regulates cushion formation and SA valve morphogenesis |
| WNT2 | Signaling ligand in cardiac development | May influence SA valve formation |
| VEGFA | Angiogenic factor | Expressed in developing valves and may affect SA valve |
How Is sinoatrial valve morphogenesis Regulated?
Sinoatrial valve morphogenesis is regulated by a combination of signaling pathways and transcriptional networks. Endocardial NOTCH1 signaling acts as a master regulator, controlling both sinus venosus valve and sinoatrial node development. The transcription factor Shox2 is essential for sinoatrial and pacemaking development, and its expression is tightly regulated during embryogenesis. Hedgehog signaling controls sinoatrial node development and atrioventricular cushion formation, and its perturbation leads to valve defects. Additionally, translational control of furina by an RNA regulon provides a post-transcriptional layer of regulation important for cardiac valve function. These pathways likely interact to ensure proper spatiotemporal control of SA valve morphogenesis.
sinoatrial valve morphogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NOTCH1 | Congenital arrhythmias, sinus node dysfunction | Endocardial-specific knockout mouse |
| SHOX2 | Sinus node dysfunction, pacemaker defects | Shox2 knockout mouse |
| FURINA | Cardiac valve defects, left-right patterning abnormalities | Zebrafish furina mutant |
| HNK-1 | Abnormal atrial automaticity | Human embryonic tissue studies |
| TBX3 | Arrhythmogenic areas in adult heart | Mouse models of conduction system defects |
Congenital arrhythmias and abnormal atrial automaticity
Defects in sinoatrial valve morphogenesis are linked to abnormal atrial automaticity and arrhythmogenic areas in the adult heart. Human embryonic studies using HNK-1 antigen expression reveal that the SA valve region contributes to the developing conduction system, and its malformation may lead to arrhythmias. Embryonic conduction tissue spatially correlates with adult arrhythmogenic areas, suggesting that developmental defects in the SA valve may predispose to arrhythmias.
Sinus node dysfunction and pacemaker defects
Shox2 mutations in mice cause severe defects in SA valve morphogenesis and loss of pacemaker function, highlighting a link between SA valve development and sinus node dysfunction. NOTCH1 signaling defects also impair sinoatrial node formation, further connecting SA valve morphogenesis to pacemaker diseases.
Cardiac valve disease and left-right patterning defects
Translational control of furina by an RNA regulon is important for left-right patterning, heart morphogenesis, and cardiac valve function. Disruption of this regulon leads to cardiac valve defects, including the SA valve, and may contribute to heterotaxy syndromes.
From sinoatrial valve morphogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does NOTCH1 signaling control SA valve morphogenesis? | Endocardial-specific Notch1 knockout mouse |
| What is the role of Shox2 in SA valve development? | Shox2 knockout and conditional mutant mice |
| How does Hedgehog signaling affect SA valve formation? | Zebrafish and mouse Hedgehog pathway mutants |
| What is the impact of furina translational control on SA valve? | Zebrafish furina mutants and RNA regulon disruption |
| How does the SA valve contribute to the conduction system? | HNK-1 expression in human embryos |
| What molecular building blocks define the secondary pacemaker region? | Zebrafish atrioventricular canal transcriptomics |
How to Study the sinoatrial valve morphogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptome-wide gene expression | Identify genes enriched in SA valve region |
| Single-cell RNA-seq | Cell-type-specific expression | Dissect cellular heterogeneity of SA valve |
| Immunohistochemistry | Protein localization | Detect HNK-1, NOTCH1, Shox2 in developing heart [1,7,8] |
| Lineage tracing | Cell fate mapping | Trace SA valve progenitors |
| Genetic knockout | Gene function in vivo | Test requirement of Notch1, Shox2, Hedgehog [1,3,7] |
| Electrophysiology | Pacemaker activity | Assess SA node function in mutants |
| In situ hybridization | mRNA localization | Visualize Shox2, Notch1 expression patterns [1,7] |
| Translational profiling | mRNA translation efficiency | Study RNA regulon control of furina |
Genomic and transcriptomic analyses
Genomic and physiological analyses of the zebrafish atrioventricular canal have revealed molecular building blocks of the secondary pacemaker region, providing insights into SA valve morphogenesis. RNA-seq and single-cell transcriptomics can identify gene expression programs in the developing SA valve.
Lineage tracing and immunohistochemistry
HNK-1 antigen expression has been used to study the development of cardiac conduction tissue in human embryos, including the SA valve region. Lineage tracing in mice and zebrafish can map the cellular origins of the SA valve.
Genetic knockout and mutation models
Targeted mutations in Notch1, Shox2, and Hedgehog pathway components have been used to dissect their roles in SA valve morphogenesis [1,3,7]. These models allow functional testing of candidate genes.
Physiological and electrophysiological recordings
Physiological analyses of the zebrafish atrioventricular canal have characterized the secondary pacemaker region, which shares properties with the SA valve. Electrophysiological recordings can assess pacemaker function in mutant hearts.
How CRISPR Can Be Used to Study GO:0003185 sinoatrial valve morphogenesis
Knockout
CRISPR knockout of Notch1, Shox2, or Hedgehog pathway genes in animal models or cell lines can recapitulate SA valve morphogenesis defects. For example, endocardial-specific Notch1 knockout in mice leads to impaired SA valve and sinoatrial node development. Knockout of Shox2 causes severe SA valve defects.
Point Mutation
Point mutations in SHOX2 or NOTCH1 identified in patients can be introduced using CRISPR base editing or homology-directed repair to test their impact on SA valve morphogenesis. Such models help determine whether specific variants are pathogenic.
Knock-in
Knock-in of fluorescent reporters (e.g., HNK-1, TBX3) or epitope tags into endogenous loci allows visualization and isolation of SA valve cells. This approach can track the contribution of specific genes to valve development [5,8].
Overexpression
Overexpression of NOTCH1 or Shox2 using CRISPR activation or transgenic constructs can test sufficiency for SA valve formation. Conversely, overexpression of dominant-negative forms can disrupt morphogenesis [1,7].
How EDITGENE Supports sinoatrial valve morphogenesis Research
Researchers studying sinoatrial valve morphogenesis-related genes often need to determine whether a candidate gene is causally involved in the process. EDITGENE provides CRISPR-based services to create knockout, point-mutation, knock-in, and overexpression cell models, as well as CRISPR library screening and bioinformatics support, enabling functional validation of genes implicated in SA valve development.
Contact EDITGENE today to design your custom CRISPR model for sinoatrial valve morphogenesis research.
Frequently Asked Questions About sinoatrial valve morphogenesis
What is GO:0003185 sinoatrial valve morphogenesis?
GO:0003185 is the biological process in which the structure of the sinoatrial valve is generated and organized during embryonic development.
What genes are involved in sinoatrial valve morphogenesis?
Key genes include NOTCH1, SHOX2, Hedgehog pathway components (GLI1, GLI2, PTCH1), and FURINA [1,2,3,7].
How does NOTCH1 signaling control sinoatrial valve development?
Endocardial NOTCH1 signaling controls sinus venosus valve and sinoatrial node development; its deletion leads to defective SA valve morphogenesis.
What is the role of Shox2 in sinoatrial valve morphogenesis?
Shox2 is a homeodomain transcription factor essential for sinoatrial and pacemaking development; its mutation causes severe SA valve defects.
Is Hedgehog signaling involved in sinoatrial valve formation?
Yes, Hedgehog signaling controls sinoatrial node development and atrioventricular cushion formation, implicating it in SA valve morphogenesis.
What diseases are linked to sinoatrial valve morphogenesis defects?
Defects are linked to congenital arrhythmias, abnormal atrial automaticity, and sinus node dysfunction [5,7,8].
How can I study sinoatrial valve morphogenesis in the lab?
Methods include genetic knockout models, lineage tracing, RNA-seq, and electrophysiology in zebrafish and mice [1,2,3,6,7].
What is the connection between the SA valve and the conduction system?
The SA valve contributes to the developing conduction system, and its region correlates with adult arrhythmogenic areas [5,8].
Can CRISPR be used to model sinoatrial valve morphogenesis?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can recapitulate SA valve defects and test gene function [1,7].
What model organisms are used to study sinoatrial valve morphogenesis?
Zebrafish, mice, and human embryonic tissue studies are commonly used [1,2,3,4,6,7,8].
Conclusion
Sinoatrial valve morphogenesis (GO:0003185) is a critical developmental process that shapes the SA valve and contributes to the cardiac conduction system. Key regulators include NOTCH1, Shox2, Hedgehog signaling, and translational control of furina [1,2,3,7]. Defects in this process are linked to congenital arrhythmias and abnormal atrial automaticity [5,8]. Continued research using CRISPR models and advanced genomics will further elucidate the molecular mechanisms and potential therapeutic targets for related cardiac diseases.
References
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- 2. Nagorska A et al.. 2023. Translational control of furina by an RNA regulon is important for left-right patterning, heart morphogenesis and cardiac valve function.. Development 150(23) PMID: 38032088
- 3. Zhang C et al.. 2021. Hedgehog signalling controls sinoatrial node development and atrioventricular cushion formation.. Open Biol 11(6):210020 PMID: 34062094
- 4. Gallego A et al.. 1997. Anatomy and development of the sinoatrial valves in the dogfish (Scyliorhinus canicula).. Anat Rec 248(2):224-32 PMID: 9185988
- 5. Jongbloed MR et al.. 2004. Embryonic conduction tissue: a spatial correlation with adult arrhythmogenic areas.. J Cardiovasc Electrophysiol 15(3):349-55 PMID: 15030427
- 6. Abu Nahia K et al.. 2021. Genomic and physiological analyses of the zebrafish atrioventricular canal reveal molecular building blocks of the secondary pacemaker region.. Cell Mol Life Sci 78(19-20):6669-6687 PMID: 34557935
- 7. Blaschke RJ et al.. 2007. Targeted mutation reveals essential functions of the homeodomain transcription factor Shox2 in sinoatrial and pacemaking development.. Circulation 115(14):1830-8 PMID: 17372176
- 8. Blom NA et al.. 1999. Development of the cardiac conduction tissue in human embryos using HNK-1 antigen expression: possible relevance for understanding of abnormal atrial automaticity.. Circulation 99(6):800-6 PMID: 9989966
