GO:0086007 voltage-gated calcium channel activity involved in cardiac muscle cell action potential: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0086007 describes the voltage-gated calcium channel activity that carries calcium ions across the plasma membrane of cardiac muscle cells and contributes to the depolarization phase of the cardiac action potential.
• The main molecular players are the L-type calcium channel subunits CACNA1C, CACNA1D, CACNB2 and CACNA2D1, which together form the cardiac Cav1.2 channel complex.
• Calcium entry through these channels is a central trigger for excitation-contraction coupling and is tightly regulated by phosphorylation, sialylation and mineralocorticoid receptor signaling.
• Dysfunction of this activity is linked to tachyarrhythmias, sudden cardiac death, dilated cardiomyopathy and drug-induced electrical remodeling.
• Human induced pluripotent stem cell-derived cardiomyocytes and heterologous expression systems are key models for studying this activity.
• CRISPR knockout, point mutation, knock-in and overexpression models allow causal testing of channel subunits and their regulators.
Description
GO:0086007, voltage-gated calcium channel activity involved in cardiac muscle cell action potential, is a molecular function term that describes the calcium-selective, voltage-dependent ion flux across the cardiac muscle cell plasma membrane during the depolarization phase of the action potential. This activity is essential for converting electrical excitation into mechanical contraction and for shaping the plateau phase of the cardiac action potential. In the heart, the dominant voltage-gated calcium current is carried by L-type calcium channels, especially the Cav1.2 complex, which opens in response to membrane depolarization and allows calcium ions to enter the cell. Because calcium entry is both a signal and a charge carrier, its dysregulation can directly alter action potential duration, trigger arrhythmias and contribute to sudden cardiac death. Researchers study GO:0086007 to understand how ion channel subunits, auxiliary proteins and post-translational modifications control cardiac excitability. The term is also relevant to disease modeling because mutations or functional changes in voltage-gated calcium channels have been observed in cardiomyopathies and arrhythmia syndromes. In addition, pharmacological agents and disease conditions such as hypoxia or muscular dystrophy can modulate voltage-gated ion channel behavior in cardiac and vascular cells.
voltage-gated calcium channel activity involved in cardiac muscle cell action potential At A Glance
| GO ID | GO:0086007 |
|---|---|
| GO term | voltage-gated calcium channel activity involved in cardiac muscle cell action potential |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Voltage-dependent calcium ion transfer across the cardiac muscle cell plasma membrane during action potential depolarization |
| Ion selectivity | Calcium ions |
| Voltage dependence | Channel opening depends on the membrane voltage across the plasma membrane |
| Cell type | Cardiac muscle cell |
| Process context | Cardiac muscle cell action potential, depolarization phase |
What Is GO:0086007?
In simple terms, GO:0086007 is the activity of a calcium channel that opens when the cardiac muscle cell membrane voltage changes, letting calcium ions flow into the cell and helping to depolarize the cell during an action potential. The QuickGO definition states that this activity enables the transmembrane transfer of a calcium ion by a voltage-gated channel across the plasma membrane of a cardiac muscle cell and contributes to the depolarization phase of an action potential. A voltage-gated channel is one whose open state depends on the voltage across the membrane in which it is embedded. This term is a molecular function, not a cellular component or a biological process, and it specifically refers to the calcium-conducting activity of the channel in the context of the cardiac action potential.
Why Is voltage-gated calcium channel activity involved in cardiac muscle cell action potential Important in Cell Biology?
GO:0086007 is important because calcium entry through voltage-gated calcium channels is a primary determinant of cardiac action potential shape, duration and excitation-contraction coupling, and its dysfunction is directly implicated in life-threatening arrhythmias and sudden cardiac death. Understanding this activity helps researchers interpret how mutations, drugs and disease states alter cardiac electrical behavior, and it provides a mechanistic basis for targeting calcium channels in arrhythmia and cardiomyopathy research.
• Controls calcium influx that contributes to the depolarization phase of the cardiac action potential.
• Links electrical excitation to mechanical contraction in cardiac muscle cells.
• Dysregulation is associated with tachyarrhythmias and sudden cardiac death.
• Is a target of pharmacological modulation by drugs such as retigabine, which can alter the heart's electrical properties.
• Is affected by disease conditions such as dilated cardiomyopathy in limb-girdle muscular dystrophy.
• Is modulated by post-translational modifications such as sialylation of voltage-gated ion channels.
• Is influenced by mineralocorticoid receptor signaling, which is a therapeutic target against ventricular arrhythmias.
• Can be studied in patient-specific induced pluripotent stem cell-derived cardiomyocytes to model cardiac channel dysfunction.
• Is relevant to understanding how hypoxia and vascular voltage-gated channels affect rhythmic contractile behavior.
• Provides a molecular function endpoint for CRISPR-based causal gene studies in cardiac excitability research.
What Happens During voltage-gated calcium channel activity involved in cardiac muscle cell action potential?
Voltage sensing and channel activation
In simple terms: The channel senses a change in voltage and opens.
In cardiac muscle cells, voltage-gated calcium channels respond to membrane depolarization by opening their ion-conducting pore. This voltage-dependent gating is a defining property of the activity described by GO:0086007, and it allows calcium ions to move across the plasma membrane during the depolarization phase of the action potential. The channel open state is dependent on the voltage across the membrane in which it is embedded, as stated in the QuickGO definition. This step is critical because it converts an electrical change into a calcium signal.
Calcium ion permeation
In simple terms: Calcium ions flow into the cell through the open channel.
Once open, the channel permits transmembrane transfer of calcium ions across the plasma membrane of the cardiac muscle cell. This calcium influx contributes to the depolarization phase of the action potential and supports downstream calcium-dependent processes. The activity is calcium-selective and is part of the broader voltage-gated ion channel behavior that shapes cardiac excitability.
Contribution to action potential depolarization
In simple terms: The entering calcium helps keep the cell depolarized.
Calcium entry through voltage-gated calcium channels contributes to the depolarization phase of the cardiac muscle cell action potential. This contribution is essential for the normal electrical waveform of the heart, and disturbances in this activity can promote tachyarrhythmias and sudden cardiac death. The term GO:0086007 specifically captures this action-potential-linked calcium channel activity rather than all calcium channel functions in the heart.
Excitation-contraction coupling
In simple terms: The calcium signal helps the heart cell contract.
The calcium ions that enter through voltage-gated calcium channels during the action potential are a key trigger for excitation-contraction coupling in cardiac muscle. This functional link explains why changes in GO:0086007 activity can alter contractile behavior and why it is studied in models of cardiomyopathy and arrhythmia. Disease conditions such as dilated cardiomyopathy in limb-girdle muscular dystrophy have been associated with ion channel dysfunctions that affect cardiac electrical properties.
Key Genes Involved in GO:0086007 voltage-gated calcium channel activity involved in cardiac muscle cell action potential
The following genes and proteins are central to voltage-gated calcium channel activity involved in cardiac muscle cell action potential, based on their established roles in cardiac calcium channel complexes and related ion channel regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CACNA1C | Pore-forming alpha-1C subunit of the L-type voltage-gated calcium channel Cav1.2 | Primary mediator of cardiac L-type calcium current contributing to action potential depolarization |
| CACNA1D | Pore-forming alpha-1D subunit of L-type voltage-gated calcium channels | Contributes to voltage-gated calcium channel activity in cardiac and other excitable cells |
| CACNB2 | Beta-2 auxiliary subunit of voltage-gated calcium channels | Modulates channel trafficking, gating and cardiac calcium current |
| CACNA2D1 | Alpha-2/delta-1 auxiliary subunit of voltage-gated calcium channels | Regulates channel expression and function in cardiac muscle |
| SCN5A | Voltage-gated sodium channel alpha subunit | Cardiac sodium channel dysfunction interacts with calcium dysregulation in arrhythmia |
| SCN1B | Voltage-gated sodium channel beta-1 subunit | Modulates voltage-gated ion channel behavior including sialylation-dependent effects |
| SCN2B | Voltage-gated sodium channel beta-2 subunit | Contributes to voltage-gated ion channel modulation by sialylation |
| NR3C2 | Mineralocorticoid receptor | Signaling pathway that influences cardiac electrical properties and ventricular arrhythmias |
| PDE2A | Cyclic nucleotide phosphodiesterase | Regulates cyclic nucleotide signaling that can affect cardiac excitability and calcium channels |
| PDE3A | Cyclic nucleotide phosphodiesterase | Modulates cyclic nucleotide-coupled signaling in cardiac cells |
| PDE4B | Cyclic nucleotide phosphodiesterase | Participates in pre-synaptic sympathetic calcium channel regulation and cardiac excitability |
| KCNQ2 | Voltage-gated potassium channel subunit | Target of retigabine, which can modulate the heart's electrical properties |
| KCNQ3 | Voltage-gated potassium channel subunit | Contributes to retigabine-sensitive ion channel activity in cardiac tissue |
| DMPK | Dystrophia myotonica protein kinase | Involved in myotonic dystrophy type 1 cardiac involvement and voltage-gated sodium channel effects |
| SCN4A | Voltage-gated sodium channel alpha subunit | Related to ion channel dysfunction in muscular dystrophy with cardiac involvement |
| STIM1 | Calcium sensor in store-operated calcium entry | Calcium handling protein relevant to cardiac calcium signaling |
| ORAI1 | Store-operated calcium channel subunit | Calcium entry pathway that interacts with cardiac calcium homeostasis |
How Is voltage-gated calcium channel activity involved in cardiac muscle cell action potential Regulated?
The activity described by GO:0086007 is regulated at multiple levels. Post-translational modification by sialylation can modulate voltage-gated ion channels, including their gating and surface expression. Cyclic nucleotide-coupled phosphodiesterases, such as PDE2A, PDE3A and PDE4B, regulate cyclic nucleotide signaling that influences cardiac excitability and pre-synaptic sympathetic calcium channels. Mineralocorticoid receptor signaling is another regulatory axis that affects ventricular arrhythmia susceptibility and cardiac electrical properties. Pharmacological agents such as retigabine can modulate the heart's electrical properties, indicating that ion channel activity in cardiac tissue is sensitive to drug-induced regulation. Disease states such as hypoxia can also promote rhythmic contractile oscillations mediated by voltage-gated ion channel activation in vascular tissue, illustrating that environmental and metabolic conditions can regulate related channel activities.
voltage-gated calcium channel activity involved in cardiac muscle cell action potential and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CACNA1C | Arrhythmia and calcium dysregulation in cardiac cells | CRISPR knockout or point mutation in human iPSC-derived cardiomyocytes |
| SCN5A | Cardiac sodium channel dysfunction and arrhythmia | Knock-in of patient variants in cardiomyocyte models |
| NR3C2 | Mineralocorticoid receptor-linked ventricular arrhythmia | Overexpression or knockout in cardiac cell lines |
| DMPK | Myotonic dystrophy type 1 cardiac involvement | Patient-specific iPSC-derived cardiomyocytes |
| KCNQ2/KCNQ3 | Drug-induced modulation of cardiac electrical properties | Heterologous expression with retigabine treatment |
Arrhythmias and sudden cardiac death
Dysregulation of sodium and calcium handling in cardiac cells is a major mechanism underlying tachyarrhythmias and sudden cardiac death. Voltage-gated calcium channel activity involved in the cardiac action potential is therefore directly relevant to arrhythmia risk, because changes in calcium influx can alter action potential duration and trigger abnormal electrical activity. Therapeutic strategies that target mineralocorticoid receptor signaling have been proposed against ventricular arrhythmias, further linking regulatory pathways to this calcium channel activity.
Cardiomyopathy and muscular dystrophy
Ion channel dysfunctions have been observed in dilated cardiomyopathy associated with limb-girdle muscular dystrophy, indicating that cardiac electrical properties can be disrupted in genetic muscle disease. This supports the idea that voltage-gated calcium channel activity in cardiac muscle cells may be altered in cardiomyopathy contexts, although the exact contribution of GO:0086007 to these phenotypes requires further study.
Drug-induced electrical remodeling
The anticonvulsant drug retigabine can modulate the heart's electrical properties, showing that pharmacological agents can influence cardiac ion channel behavior. Because GO:0086007 describes a calcium channel activity that contributes to the cardiac action potential, drug-induced changes in related ion channels may indirectly affect calcium-dependent depolarization and should be considered in safety pharmacology.
Myotonic dystrophy type 1 cardiac involvement
Patient-specific induced pluripotent stem cells from myotonic dystrophy type 1 have revealed the impact of voltage-gated sodium channels on cardiac involvement. This illustrates how inherited disorders can alter voltage-gated ion channel function in cardiac cells, providing a disease context in which calcium channel activity contributing to the action potential may also be relevant.
From voltage-gated calcium channel activity involved in cardiac muscle cell action potential-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CACNA1C abolish cardiac L-type calcium current? | CRISPR knockout in human iPSC-derived cardiomyocytes |
| Does a specific channel mutation alter voltage-dependent gating? | Point mutation knock-in in heterologous cells or cardiomyocytes |
| Can a disease-associated variant recapitulate arrhythmia phenotypes? | Knock-in of patient variant in iPSC-derived cardiomyocytes |
| Where and when is the channel expressed in cardiac cells? | Tagged knock-in with fluorescent or epitope tag |
| Does overexpression of an auxiliary subunit increase calcium current? | Overexpression in cardiac cell lines or iPSC-derived cardiomyocytes |
| Which regulators modify channel activity? | CRISPR library screening combined with electrophysiology |
How to Study the voltage-gated calcium channel activity involved in cardiac muscle cell action potential Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Patch-clamp electrophysiology | Voltage-gated calcium current and gating properties | Direct functional assay for GO:0086007 |
| Calcium imaging | Intracellular calcium transients | Excitation-contraction coupling studies |
| Action potential recording | Action potential duration and morphology | Cardiac electrical phenotype assessment |
| CRISPR knockout | Loss-of-function effect on channel activity | Causal gene testing |
| CRISPR point mutation | Effect of specific variants on channel function | Variant interpretation |
| CRISPR knock-in | Tagged or patient-variant channel expression | Localization and disease modeling |
| Overexpression | Gain-of-function effect on calcium current | Subunit and regulator studies |
| CRISPR library screening | Identification of modifiers of channel activity | Unbiased regulator discovery |
Electrophysiology
Patch-clamp electrophysiology is the gold-standard method to measure voltage-gated calcium channel activity directly, including current amplitude, voltage dependence of activation and inactivation. This approach is essential for assigning function to GO:0086007 in cardiac muscle cells and for testing how mutations or drugs alter channel behavior.
Calcium imaging
Calcium-sensitive fluorescent dyes or genetically encoded calcium indicators can report changes in intracellular calcium that result from voltage-gated calcium channel activity. In cardiac muscle cells, calcium imaging links channel function to excitation-contraction coupling and action potential-driven calcium transients.
Action potential recordings
Action potential duration and morphology can be recorded using microelectrode arrays or patch-clamp in current-clamp mode. These measurements show how changes in voltage-gated calcium channel activity contribute to the depolarization phase of the cardiac action potential.
CRISPR-based genetic perturbation
CRISPR knockout, point mutation, knock-in and overexpression models allow causal testing of candidate genes in the GO:0086007 pathway. Combining these models with electrophysiology and calcium imaging helps determine whether a specific channel subunit or regulator is required for cardiac calcium channel activity.
How CRISPR Can Be Used to Study GO:0086007 voltage-gated calcium channel activity involved in cardiac muscle cell action potential
Knockout
CRISPR knockout of genes encoding voltage-gated calcium channel subunits, such as CACNA1C, can abolish or reduce the calcium current that contributes to the cardiac action potential. This approach provides direct causal evidence for the role of a specific gene in GO:0086007 and is commonly combined with electrophysiology in cardiomyocyte models.
Point Mutation
CRISPR point mutation allows introduction of disease-associated or functionally informative variants into channel genes. This is useful for testing how single amino acid changes alter voltage-dependent gating, calcium permeation or action potential contribution, thereby refining the functional annotation of GO:0086007.
Knock-in
CRISPR knock-in can be used to insert fluorescent or epitope tags into channel genes to track localization and expression, or to introduce patient-specific variants into cardiac cell models. Knock-in models help connect channel expression and trafficking to the calcium channel activity described by GO:0086007.
Overexpression
CRISPR-mediated overexpression or cDNA-based overexpression of channel subunits and auxiliary proteins can test gain-of-function effects on cardiac calcium current. This approach is valuable for determining whether increased expression of a candidate gene enhances the voltage-gated calcium channel activity involved in the cardiac action potential.
How EDITGENE Supports voltage-gated calcium channel activity involved in cardiac muscle cell action potential Research
Researchers studying voltage-gated calcium channel activity involved in cardiac muscle cell action potential-related genes often need to determine whether a candidate gene is causally involved in calcium influx, action potential depolarization or disease phenotypes. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbation and functional validation of these candidates in cardiac and heterologous systems.
Contact EDITGENE today to design your custom CRISPR model for voltage-gated calcium channel activity involved in cardiac muscle cell action potential research.
Frequently Asked Questions About voltage-gated calcium channel activity involved in cardiac muscle cell action potential
What is GO:0086007?
GO:0086007 is the Gene Ontology molecular function term for voltage-gated calcium channel activity involved in cardiac muscle cell action potential, describing calcium ion transfer across the cardiac muscle cell plasma membrane during depolarization.
What genes are involved in voltage-gated calcium channel activity involved in cardiac muscle cell action potential?
Key genes include CACNA1C, CACNA1D, CACNB2 and CACNA2D1, which encode subunits of the cardiac L-type calcium channel complex.
What does voltage-gated calcium channel activity involved in cardiac muscle cell action potential do?
It allows calcium ions to enter cardiac muscle cells when the membrane depolarizes, contributing to the depolarization phase of the action potential and to excitation-contraction coupling.
Why is calcium channel activity important for the cardiac action potential?
Calcium entry through voltage-gated channels helps shape the action potential plateau and provides the trigger for contraction; its dysregulation can cause arrhythmias and sudden cardiac death.
Which diseases are linked to voltage-gated calcium channel dysfunction in the heart?
Tachyarrhythmias, sudden cardiac death, dilated cardiomyopathy in limb-girdle muscular dystrophy and drug-induced electrical remodeling have been associated with ion channel dysfunction.
How is voltage-gated calcium channel activity regulated in cardiac cells?
It is regulated by post-translational modifications such as sialylation, cyclic nucleotide phosphodiesterases and mineralocorticoid receptor signaling.
What research models are used to study GO:0086007?
Patch-clamp electrophysiology, calcium imaging, action potential recordings and CRISPR-modified cardiomyocytes or heterologous cells are commonly used.
Can CRISPR knockout help study cardiac calcium channels?
Yes, CRISPR knockout of channel subunit genes can reduce or abolish calcium current and help establish causal roles in the action potential.
What is the role of CACNA1C in the heart?
CACNA1C encodes the pore-forming subunit of the cardiac L-type calcium channel Cav1.2, which carries the main voltage-gated calcium current contributing to the action potential.
How do drugs affect voltage-gated calcium channel activity in the heart?
Drugs such as retigabine can modulate the heart's electrical properties, and other agents targeting mineralocorticoid receptor signaling may influence ventricular arrhythmia susceptibility.
Conclusion
GO:0086007, voltage-gated calcium channel activity involved in cardiac muscle cell action potential, is a precisely defined molecular function that connects calcium influx to cardiac electrical activity. Its core molecular players, including CACNA1C and auxiliary subunits, are well established, and its dysregulation is linked to arrhythmias, cardiomyopathy and drug-induced electrical remodeling. Studying this activity requires a combination of electrophysiology, calcium imaging and CRISPR-based genetic models to establish causal relationships. With EDITGENE's CRISPR services, researchers can generate knockout, point mutation, knock-in and overexpression models to dissect the mechanisms and disease relevance of this cardiac calcium channel activity.
References
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- 2. Li D et al.. 2019. Pre-synaptic sympathetic calcium channels, cyclic nucleotide-coupled phosphodiesterases and cardiac excitability.. Semin Cell Dev Biol 94:20-27 PMID: 30658154
- 3. Ednie AR et al.. 2012. Modulation of voltage-gated ion channels by sialylation.. Compr Physiol 2(2):1269-301 PMID: 23798301
- 4. Rossier MF. 2021. The Cardiac Mineralocorticoid Receptor (MR): A Therapeutic Target Against Ventricular Arrhythmias.. Front Endocrinol (Lausanne) 12:694758 PMID: 34262530
- 5. El-Battrawy I et al.. 2018. Ion Channel Dysfunctions in Dilated Cardiomyopathy in Limb-Girdle Muscular Dystrophy.. Circ Genom Precis Med 11(3):e001893 PMID: 29545480
- 6. Rubi L et al.. 2017. Modulation of the heart's electrical properties by the anticonvulsant drug retigabine.. Toxicol Appl Pharmacol 329:309-317 PMID: 28641963
- 7. Pierre M et al.. 2023. Cardiac involvement in patient-specific induced pluripotent stem cells of myotonic dystrophy type 1: unveiling the impact of voltage-gated sodium channels.. Front Physiol 14:1258318 PMID: 37791351
- 8. Virsolvy A et al.. 2021. Hypoxic Conditions Promote Rhythmic Contractile Oscillations Mediated by Voltage-Gated Sodium Channels Activation in Human Arteries.. Int J Mol Sci 22(5) PMID: 33806419
