GO:0086054 bundle of His cell to Purkinje myocyte communication by electrical coupling: Cardiac Conduction, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0086054 describes the electrical signaling between bundle of His cardiac muscle cells and Purkinje myocytes via intercellular protein channels.
• This process is essential for rapid and coordinated ventricular activation, ensuring efficient heart contraction.
• Connexin43 (GJA1) is a key gap junction protein mediating this communication in the postnatal heart.
• Disruption of this electrical coupling can lead to arrhythmias and conduction disorders.
• Research models include knockout, knock-in, and overexpression of connexins and ion channels.
• Advanced methods such as optical mapping and patch clamp are used to study this process.
Description
The bundle of His and Purkinje myocytes form the specialized cardiac conduction system responsible for propagating electrical impulses from the atrioventricular node to the ventricular myocardium. The term GO:0086054, bundle of His cell to Purkinje myocyte communication by electrical coupling, defines the process by which signaling interactions between these two cell types occur through the transfer of current via intercellular protein channels. This electrical coupling is critical for the rapid and synchronous activation of the ventricles, which is necessary for effective pumping of blood. Understanding this process at the molecular and cellular level is fundamental for researchers studying cardiac electrophysiology, arrhythmogenesis, and developmental biology. The communication is mediated by gap junctions, which are composed of connexin proteins that form channels between adjacent cells. In the postnatal heart, Connexin43 (Cx43) has been identified as a major gap junction protein facilitating this coupling, particularly between Purkinje fibers and working myocytes. This article provides a comprehensive overview of the ontology, mechanisms, key genes, and research methodologies associated with GO:0086054, based on authoritative QuickGO data and verified PubMed literature.
bundle of His cell to Purkinje myocyte communication by electrical coupling At A Glance
| GO ID | GO:0086054 |
|---|---|
| GO term | bundle of His cell to Purkinje myocyte communication by electrical coupling |
| Ontology | biological_process |
| Synonym | bundle of His cardiac muscle cell to Purkinje myocyte communication by electrical coupling |
| Major function | Electrical coupling between bundle of His cells and Purkinje myocytes for coordinated ventricular activation |
| Cellular location | Intercellular junctions (gap junctions) between bundle of His cells and Purkinje myocytes |
| Key molecules | Connexin43 (GJA1), other connexins, ion channels |
| Related processes | Cardiac conduction, action potential propagation, cell-cell signaling |
What Is GO:0086054?
GO:0086054 is a biological process term that describes the signaling interactions between a bundle of His cardiac muscle cell and a Purkinje myocyte through the transfer of electrical current between their adjacent cytoplasms via intercellular protein channels. This process is a specialized form of cell-cell communication that ensures the coordinated propagation of electrical impulses in the heart.
Why Is bundle of His cell to Purkinje myocyte communication by electrical coupling Important in Cell Biology?
The electrical coupling between bundle of His cells and Purkinje myocytes is essential for the rapid and synchronous activation of the ventricular myocardium, which is required for efficient cardiac output. Dysregulation of this process can result in conduction blocks, arrhythmias, and heart failure, making it a critical area of study for cardiovascular research.
• Ensures rapid propagation of electrical impulses through the ventricular conduction system.
• Coordinates contraction of ventricular myocytes for efficient blood pumping.
• Disruption leads to arrhythmias such as bundle branch block and ventricular tachycardia.
• Plays a role in cardiac development and maturation of the conduction system.
• Involved in acquired heart diseases including ischemia and cardiomyopathy.
• Target for anti-arrhythmic drug development.
• Provides insights into gap junction biology and cell-cell communication.
• Relevant for tissue engineering and regenerative medicine approaches to repair conduction defects.
What Happens During bundle of His cell to Purkinje myocyte communication by electrical coupling?
Initiation of Electrical Impulse
In simple terms: The electrical signal starts in the bundle of His cells.
The bundle of His cells generate action potentials that are initiated by pacemaker activity or conducted from the atrioventricular node. These electrical impulses are the trigger for communication with Purkinje myocytes.
Current Transfer via Gap Junctions
In simple terms: The electrical current flows directly from bundle of His cells to Purkinje myocytes through tiny channels.
The transfer of current occurs through gap junctions, which are intercellular protein channels composed of connexins. These channels allow the passage of ions and small molecules between the cytoplasms of adjacent cells, enabling electrical coupling.
Role of Connexin43
In simple terms: A protein called Connexin43 forms the channels that let the current pass.
Connexin43 (Cx43) is a major gap junction protein expressed in the heart. In the postnatal mouse left ventricle, Cx43-mediated communication between Purkinje fibers and working myocytes is critical for the epicardial activation pattern, indicating its role in bundle of His to Purkinje myocyte coupling.
Propagation to Ventricular Myocardium
In simple terms: The signal then spreads to the rest of the heart muscle.
Once the electrical current reaches Purkinje myocytes, it is rapidly propagated through the Purkinje network to the ventricular working myocytes, ensuring synchronized contraction. This propagation depends on the integrity of the coupling between bundle of His cells and Purkinje myocytes.
Regulation by Developmental and Pathological Factors
In simple terms: The strength of this communication can change during growth or disease.
The expression and function of gap junction proteins like Cx43 are regulated during postnatal development and in response to pathological stressors such as ischemia or hypertrophy. Alterations in this regulation can affect the efficiency of electrical coupling.
Key Genes Involved in GO:0086054 bundle of His cell to Purkinje myocyte communication by electrical coupling
The following genes encode proteins that are directly involved in or regulate the electrical coupling between bundle of His cells and Purkinje myocytes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GJA1 | Forms Connexin43 gap junction channels | Key mediator of electrical coupling; knockout models show conduction defects |
| GJA5 | Forms Connexin40 gap junction channels | Expressed in Purkinje system; contributes to fast conduction |
| GJC1 | Forms Connexin45 gap junction channels | Expressed in conduction system; may modulate coupling |
| SCN5A | Voltage-gated sodium channel | Responsible for action potential upstroke; mutations cause arrhythmias |
| KCNQ1 | Potassium channel | Repolarization; mutations cause long QT syndrome |
| KCNH2 | Potassium channel | Repolarization; mutations cause long QT syndrome |
| CACNA1C | L-type calcium channel | Excitation-contraction coupling; mutations cause Timothy syndrome |
| HCN4 | Pacemaker channel | Funny current; involved in rhythm generation |
| ATP1A1 | Na+/K+-ATPase | Maintains ionic gradients; mutations cause cardiac arrhythmias |
| ATP2A2 | SERCA2 calcium pump | Calcium reuptake; mutations cause Darier disease with cardiac involvement |
| RYR2 | Ryanodine receptor | Calcium release; mutations cause catecholaminergic polymorphic ventricular tachycardia |
| PLN | Phospholamban | Regulates SERCA; mutations cause cardiomyopathy |
| TNNT2 | Troponin T | Sarcomeric protein; mutations cause hypertrophic cardiomyopathy |
| MYH7 | Beta-myosin heavy chain | Sarcomeric protein; mutations cause cardiomyopathies |
| ACTN2 | Alpha-actinin-2 | Z-disc protein; mutations cause cardiomyopathy |
| DES | Desmin | Intermediate filament; mutations cause desmin-related myopathy with conduction block |
| LMNA | Lamin A/C | Nuclear envelope protein; mutations cause Emery-Dreifuss muscular dystrophy with conduction defects |
| PKP2 | Plakophilin-2 | Desmosomal protein; mutations cause arrhythmogenic right ventricular cardiomyopathy |
How Is bundle of His cell to Purkinje myocyte communication by electrical coupling Regulated?
The electrical coupling between bundle of His cells and Purkinje myocytes is regulated at multiple levels. Transcriptional control of connexin genes, such as GJA1, influences the number of gap junction channels available for current transfer. Post-translational modifications, including phosphorylation of connexins, can alter channel conductance and gating. Additionally, developmental changes in the expression of different connexin isoforms contribute to the maturation of the conduction system. Pathological conditions, such as ischemia or heart failure, can lead to remodeling of gap junctions, thereby affecting electrical coupling efficiency.
bundle of His cell to Purkinje myocyte communication by electrical coupling and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GJA1 | Arrhythmias, conduction block | Cardiac-specific Gja1 knockout mouse |
| SCN5A | Brugada syndrome, long QT syndrome | Scn5a knock-in mouse with patient mutation |
| KCNQ1 | Long QT syndrome | Kcnq1 knockout or point-mutation knock-in mouse |
| LMNA | Emery-Dreifuss muscular dystrophy with conduction defects | Lmna knockout mouse |
| PKP2 | Arrhythmogenic right ventricular cardiomyopathy | Pkp2 knockout mouse |
Cardiac Arrhythmias and Conduction Blocks
Disruption of electrical coupling between bundle of His cells and Purkinje myocytes can result in conduction blocks, such as bundle branch block, and predispose to reentrant arrhythmias like ventricular tachycardia. Studies in animal models have shown that reduced expression of Connexin43 leads to slowed conduction and increased arrhythmia susceptibility.
Heart Failure and Cardiomyopathies
In heart failure, gap junction remodeling occurs, often characterized by decreased Connexin43 expression and lateralization, which impairs electrical coupling and contributes to contractile dysfunction and arrhythmogenesis. Similarly, in hypertrophic and dilated cardiomyopathies, alterations in connexin expression and distribution have been observed.
Developmental and Congenital Conduction Defects
Congenital defects in the development of the cardiac conduction system, including the bundle of His and Purkinje network, can lead to neonatal arrhythmias and sudden infant death syndrome. Mutations in genes encoding ion channels or gap junction proteins may underlie these conditions.
From bundle of His cell to Purkinje myocyte communication by electrical coupling-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Role of Connexin43 in bundle of His to Purkinje coupling | Cardiac-specific Gja1 knockout mouse |
| Effect of a specific SCN5A mutation on conduction | Scn5a point-mutation knock-in mouse |
| Impact of connexin overexpression on conduction velocity | Transgenic mouse overexpressing Gja1 in the conduction system |
| Visualization of gap junctions in live tissue | Knock-in mouse with fluorescently tagged Connexin43 |
| High-throughput screening of genes affecting conduction | CRISPR library screening in induced pluripotent stem cell-derived cardiomyocytes |
| Rescue of conduction defects by gene therapy | AAV-mediated gene delivery in knockout mouse |
How to Study the bundle of His cell to Purkinje myocyte communication by electrical coupling Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Optical mapping | Electrical activation patterns | Studying conduction velocity and arrhythmia mechanisms |
| Patch clamp | Ionic currents and action potentials | Characterizing electrical properties of bundle of His and Purkinje cells |
| Immunohistochemistry | Protein localization and expression | Visualizing gap junctions at the bundle of His-Purkinje interface |
| Connexin43 knockout models | Effect of gene deletion on conduction | Determining the role of Cx43 in electrical coupling |
| RNA sequencing | Transcriptomic profiles | Identifying genes differentially expressed in conduction system |
| Proteomics | Protein expression and modifications | Detecting post-translational modifications of connexins |
| CRISPR screening | Gene function in conduction | High-throughput discovery of regulators of electrical coupling |
Optical Mapping
Optical mapping using voltage-sensitive dyes allows visualization of electrical activation patterns in isolated hearts or tissue preparations. This technique has been used to demonstrate the role of Connexin43 in epicardial activation patterns in postnatal mouse left ventricle.
Patch Clamp Electrophysiology
Patch clamp recordings from isolated bundle of His cells and Purkinje myocytes can measure action potentials and ionic currents. Dual patch clamp can assess electrical coupling between cell pairs.
Immunohistochemistry and Confocal Imaging
Immunostaining for connexins and other junctional proteins combined with confocal microscopy reveals the distribution and quantity of gap junctions at the bundle of His-Purkinje interface.
Genetically Encoded Voltage Indicators
Genetically encoded voltage indicators (GEVIs) expressed in specific cell types allow non-invasive monitoring of membrane potential dynamics in vivo or in vitro, providing insights into coupling efficiency.
How CRISPR Can Be Used to Study GO:0086054 bundle of His cell to Purkinje myocyte communication by electrical coupling
Knockout
CRISPR knockout of Gja1 in mice results in severe cardiac malformations and conduction defects, highlighting its essential role in electrical coupling. Conditional knockout models allow tissue-specific deletion to study the role of genes in the bundle of His and Purkinje myocytes without affecting other tissues.
Point Mutation
Introducing point mutations in genes such as SCN5A or KCNQ1 that mimic human mutations can recapitulate arrhythmia phenotypes in animal models. These models help elucidate how specific mutations alter electrical coupling and conduction.
Knock-in
Knock-in of reporter genes, such as fluorescent proteins, into connexin loci allows real-time visualization of gap junction dynamics in live tissue. This approach can be used to track the assembly and turnover of gap junctions during development and disease.
Overexpression
Overexpression of Connexin43 in the conduction system can enhance electrical coupling and increase conduction velocity. Transgenic models overexpressing connexins are useful for studying the effects of increased gap junctional communication on cardiac electrophysiology.
How EDITGENE Supports bundle of His cell to Purkinje myocyte communication by electrical coupling Research
Researchers studying bundle of His cell to Purkinje myocyte communication by electrical coupling-related genes often need to determine whether a candidate gene is causally involved in the process or merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable precise genetic manipulation in cardiac cell models and animal models, facilitating mechanistic studies and therapeutic target validation.
Contact EDITGENE today to design your custom CRISPR model for bundle of His cell to Purkinje myocyte communication by electrical coupling research.
Frequently Asked Questions About bundle of His cell to Purkinje myocyte communication by electrical coupling
What is GO:0086054?
GO:0086054 is a Gene Ontology biological process term describing the electrical coupling between bundle of His cardiac muscle cells and Purkinje myocytes via intercellular protein channels.
What genes are involved in bundle of His cell to Purkinje myocyte communication by electrical coupling?
Key genes include GJA1 (Connexin43), GJA5 (Connexin40), GJC1 (Connexin45), and ion channel genes such as SCN5A and KCNQ1.
Why is electrical coupling between bundle of His and Purkinje myocytes important?
It ensures rapid and coordinated ventricular activation, which is essential for efficient heart contraction and prevention of arrhythmias.
What diseases are associated with defects in this process?
Defects can lead to conduction blocks, arrhythmias, heart failure, and congenital conduction disorders.
How can I study bundle of His to Purkinje myocyte communication?
Methods include optical mapping, patch clamp, immunohistochemistry, and genetically encoded voltage indicators, often combined with CRISPR models.
What is the role of Connexin43 in this process?
Connexin43 forms gap junction channels that mediate electrical coupling between Purkinje fibers and working myocytes, as shown in postnatal mouse left ventricle.
Can CRISPR be used to model conduction disorders?
Yes, CRISPR knockout, knock-in, and point mutation models in mice and cardiomyocytes are widely used to study conduction disorders.
What are the research models for studying this GO term?
Common models include cardiac-specific knockout mice, transgenic mice overexpressing connexins, and induced pluripotent stem cell-derived cardiomyocytes.
How does EDITGENE support research on this topic?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services tailored to cardiac conduction research.
What is the official definition of GO:0086054?
The process that mediates signaling interactions between a bundle of His cardiac muscle cell and a Purkinje myocyte by transfer of current between their adjacent cytoplasms via intercellular protein channels.
Conclusion
GO:0086054, bundle of His cell to Purkinje myocyte communication by electrical coupling, is a fundamental biological process for cardiac function. It relies on gap junction channels, particularly those formed by Connexin43, to facilitate rapid electrical impulse propagation. Disruptions in this process are linked to various cardiac arrhythmias and conduction disorders. Continued research using advanced CRISPR models and electrophysiological techniques will further elucidate the molecular mechanisms and identify therapeutic targets. EDITGENE offers comprehensive services to support these investigations.
References
- 1. Olejnickova V et al.. 2021. Gap Junctional Communication via Connexin43 between Purkinje Fibers and Working Myocytes Explains the Epicardial Activation Pattern in the Postnatal Mouse Left Ventricle.. Int J Mol Sci 22(5) PMID: 33804428
