GO:1904878 negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1904878 describes any process that stops, prevents, or reduces calcium ion transmembrane transport through high voltage-gated calcium channels (HVCCs).
• This term is a biological_process child of negative regulation of calcium ion transmembrane transport and is synonymous with inhibition of generation of L-type calcium current.
• HVCCs, including Cav1.2 (CACNA1C), Cav1.3 (CACNA1D), and auxiliary subunits, are the principal targets of this regulatory process.
• Dysregulation of this process is linked to cardiac arrhythmias, hypertension, neurodegeneration, and cancer progression.
• Key regulatory mechanisms include phosphorylation by kinases, interaction with calmodulin, and modulation by G-proteins and second messengers.
• CRISPR-based knockout, point-mutation, and knock-in models are essential for dissecting the causal roles of specific residues and regulators in this pathway.
Description
GO:1904878, negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel, is a Gene Ontology biological process that captures the cellular mechanisms which reduce or prevent calcium influx through high voltage-gated calcium channels (HVCCs). These channels are critical for converting electrical signals into intracellular calcium transients that control muscle contraction, neurotransmitter release, and gene expression. The term is synonymous with inhibition of generation of L-type calcium current, reflecting its focus on the L-type family of HVCCs. Understanding this process is fundamental for researchers studying cardiac physiology, neuronal excitability, and calcium-dependent signaling pathways. The regulation of HVCC activity occurs at multiple levels, including channel phosphorylation, protein-protein interactions, and membrane trafficking. For example, CAMK1 phosphoinositide signal-mediated protein sorting and transport network has been implicated in hepatocellular carcinoma, highlighting the broader relevance of calcium transport regulation in disease. This article provides a comprehensive overview of GO:1904878, integrating its definition, molecular players, disease associations, and experimental strategies for investigation.
negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel At A Glance
| GO ID | GO:1904878 |
|---|---|
| GO term | negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel |
| Ontology | biological_process |
| Synonym | inhibition of generation of L-type calcium current |
| Major function | Reduces calcium influx through high voltage-gated calcium channels |
| Parent term | negative regulation of calcium ion transmembrane transport |
| Related cellular component | Voltage-gated calcium channel complex |
| Related molecular function | Calcium channel inhibitor activity |
| Taxonomic range | Eukaryota |
What Is GO:1904878?
According to the Gene Ontology, GO:1904878 is defined as any process that stops, prevents, or reduces the frequency, rate, or extent of calcium ion transmembrane transport via high voltage-gated calcium channel. In other words, it encompasses all molecular events that negatively regulate the movement of calcium ions through voltage-gated calcium channels that activate at high membrane potentials, such as L-type channels. This regulation can occur through direct channel modification, changes in channel abundance at the plasma membrane, or modulation by signaling cascades.
Why Is negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel Important in Cell Biology?
GO:1904878 is important because high voltage-gated calcium channels are central to numerous physiological processes, and their negative regulation is critical for preventing calcium overload, which can lead to cell death and disease. Dysregulated calcium influx through these channels is implicated in cardiac arrhythmias, hypertension, neurodegeneration, and cancer. Understanding the mechanisms that negatively regulate these channels provides insights into therapeutic targets for modulating calcium signaling in various pathological conditions.
• Controls cardiac action potential duration and contractility by limiting L-type calcium current.
• Prevents excitotoxicity in neurons by reducing excessive calcium entry.
• Regulates vascular tone and blood pressure through smooth muscle calcium handling.
• Influences gene expression via calcium-dependent signaling pathways.
• Dysregulation is linked to arrhythmias such as Timothy syndrome and Brugada syndrome.
• Plays a role in cancer cell proliferation and survival, as suggested by computational studies in hepatocellular carcinoma.
• Provides targets for calcium channel blockers used in hypertension and angina.
• Essential for synaptic plasticity and memory formation.
• Modulates immune cell activation and cytokine production.
• Offers potential for CRISPR-based therapeutic intervention in calcium channelopathies.
What Happens During negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel?
Initiation by Signaling Molecules
In simple terms: Signals from outside the cell start the process of reducing calcium entry.
Negative regulation of HVCCs is initiated by various extracellular and intracellular signals, including hormones, neurotransmitters, and changes in membrane potential. These signals activate intracellular cascades that ultimately target the channel. For instance, CAMK1 phosphoinositide signal-mediated protein sorting and transport network has been implicated in hepatocellular carcinoma, suggesting a role in calcium transport regulation.
Phosphorylation of Channel Subunits
In simple terms: Enzymes add phosphate groups to the channel, which can turn it down.
Phosphorylation of HVCC subunits by kinases such as protein kinase A (PKA), protein kinase C (PKC), and Ca2+/calmodulin-dependent kinase II (CaMKII) is a major mechanism of negative regulation. Depending on the site, phosphorylation can reduce channel open probability or promote internalization. The CAMK1 network may influence these phosphorylation events.
Interaction with Regulatory Proteins
In simple terms: Other proteins bind to the channel and inhibit its activity.
Calmodulin, G-protein beta-gamma subunits, and other regulatory proteins can bind to HVCCs and inhibit calcium current. For example, calmodulin binding to the C-terminal tail of Cav1.2 can induce calcium-dependent inactivation, a form of negative regulation. The protein sorting and transport network involving CAMK1 may affect the availability of such regulators.
Channel Internalization and Degradation
In simple terms: The channel is removed from the cell surface, reducing calcium entry.
Long-term negative regulation often involves endocytosis and degradation of HVCCs. Ubiquitination and subsequent proteasomal or lysosomal degradation reduce the number of functional channels at the plasma membrane. The CAMK1 phosphoinositide signal-mediated protein sorting and transport network is directly involved in protein sorting and transport, which could impact channel trafficking.
Feedback Inhibition by Calcium
In simple terms: Calcium itself can act as a brake on its own entry.
Elevated intracellular calcium can trigger negative feedback loops that inhibit HVCCs. This includes calcium-dependent inactivation and activation of calcium-sensitive phosphatases like calcineurin, which can dephosphorylate and inhibit the channel. The interplay with CAMK1 signaling may modulate these feedback mechanisms.
Key Genes Involved in GO:1904878 negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel
The following genes encode proteins that are directly involved in or regulate the negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channels.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CACNA1C | Encodes Cav1.2 alpha-1 subunit of L-type HVCC | Target for calcium channel blockers; mutations cause Timothy syndrome |
| CACNA1D | Encodes Cav1.3 alpha-1 subunit | Involved in sinoatrial node function and deafness |
| CACNA1S | Encodes Cav1.1 alpha-1 subunit | Skeletal muscle excitation-contraction coupling; mutations cause hypokalemic periodic paralysis |
| CACNA1F | Encodes Cav1.4 alpha-1 subunit | Retinal neurotransmission; mutations cause congenital stationary night blindness |
| CACNB1 | Beta subunit of HVCC | Modulates channel gating and trafficking |
| CACNB2 | Beta subunit of HVCC | Mutations linked to Brugada syndrome |
| CACNB3 | Beta subunit of HVCC | Regulates channel inactivation |
| CACNB4 | Beta subunit of HVCC | Mutations cause episodic ataxia |
| CACNA2D1 | Alpha-2/delta subunit | Auxiliary subunit; target of gabapentinoids |
| CACNA2D2 | Alpha-2/delta subunit | Involved in cerebellar function |
| CALM1 | Calmodulin | Calcium sensor mediating inactivation |
| CALM2 | Calmodulin | Mutations cause long QT syndrome |
| CALM3 | Calmodulin | Regulates channel activity |
| CAMK1 | Calcium/calmodulin-dependent protein kinase I | Part of phosphoinositide signal-mediated protein sorting and transport network in HCC |
| GNB1 | G-protein beta subunit | Inhibits HVCCs via G-beta-gamma |
| GNB2 | G-protein beta subunit | Modulates calcium currents |
| PRKACA | Protein kinase A catalytic subunit | Phosphorylates and regulates HVCCs |
| PPP3CA | Calcineurin A alpha | Calcium-dependent phosphatase that can inhibit HVCCs |
How Is negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel Regulated?
The negative regulation of HVCCs is itself tightly regulated by various signaling pathways. For example, the CAMK1 phosphoinositide signal-mediated protein sorting and transport network has been implicated in hepatocellular carcinoma, suggesting that CAMK1 may influence the trafficking and function of HVCCs. Additionally, G-protein coupled receptors can activate G-proteins that directly inhibit HVCCs. Phosphorylation by PKA and PKC can either enhance or inhibit channel activity depending on the context. Calcium-dependent inactivation and calmodulin binding provide feedback regulation. These layers of regulation ensure precise control of calcium influx.
negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CACNA1C | Timothy syndrome, Brugada syndrome | Knock-in mouse models with patient mutations |
| CACNB2 | Brugada syndrome | Knockout and point-mutation cell lines |
| CALM1 | Long QT syndrome | CRISPR knock-in of CALM1 mutations in iPSC-derived cardiomyocytes |
| CAMK1 | Hepatocellular carcinoma | Knockout in HCC cell lines (e.g., HepG2) |
| CACNA1D | Primary aldosteronism, deafness | Overexpression and knockout models |
Cardiac Arrhythmias and Heart Failure
Dysregulation of HVCC negative regulation can lead to excessive calcium influx, prolonging action potentials and causing arrhythmias. Mutations in CACNA1C, CACNB2, and CALM1/2 are associated with Timothy syndrome, Brugada syndrome, and long QT syndrome. The CAMK1 network may also play a role in cardiac calcium handling, though direct evidence is limited.
Neurodegenerative Disorders
In neurons, impaired negative regulation of HVCCs can cause calcium overload, excitotoxicity, and neurodegeneration. This is observed in Parkinson's disease, Alzheimer's disease, and amyotrophic lateral sclerosis. Calcium channel blockers are being investigated as neuroprotective agents.
Cancer
HVCCs and their regulators are implicated in cancer cell proliferation, migration, and survival. In hepatocellular carcinoma, the CAMK1 phosphoinositide signal-mediated protein sorting and transport network has been identified through biocomputation, suggesting a link between calcium transport regulation and cancer. Targeting HVCC negative regulation may offer therapeutic opportunities.
Hypertension
Increased HVCC activity in vascular smooth muscle contributes to hypertension. Negative regulation of these channels is essential for maintaining normal vascular tone. Calcium channel blockers that inhibit L-type channels are widely used to treat hypertension.
From negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CAMK1 affect HVCC trafficking? | CAMK1 knockout cell line (e.g., HEK293T) |
| Does a specific phosphorylation site on Cav1.2 regulate channel inactivation? | Point-mutation knock-in of Cav1.2 in cardiomyocytes |
| Can a disease-associated mutation in CACNA1C be corrected? | CRISPR knock-in of wild-type allele in patient iPSCs |
| How does overexpression of CACNB2 affect calcium current? | Overexpression of CACNB2 in HEK293 cells |
| What is the interactome of HVCC under negative regulation? | Tagged knock-in of CACNA1C for AP-MS |
| Can CRISPR library screening identify novel regulators of HVCC? | Genome-wide CRISPR knockout library in calcium reporter cells |
How to Study the negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Patch-clamp | Ion channel currents | Measuring L-type calcium current inhibition |
| Calcium imaging | Intracellular calcium concentration | High-throughput screening of regulators |
| CRISPR knockout screen | Gene function loss | Identifying negative regulators of HVCC |
| RNA-seq | Transcriptional changes | Assessing expression of HVCC subunits |
| Proteomics | Protein abundance and interactions | Mapping the HVCC interactome |
| Phosphoproteomics | Phosphorylation sites | Identifying kinase targets on HVCCs |
| FRET biosensors | Real-time signaling dynamics | Monitoring cAMP/PKA effects on HVCCs |
Patch-Clamp Electrophysiology
Patch-clamp recording is the gold standard for measuring HVCC currents directly. It can quantify the effects of negative regulators on channel open probability, inactivation kinetics, and current density. This method is essential for validating findings from genetic screens.
Calcium Imaging
Fluorescent calcium indicators (e.g., Fura-2, GCaMP) allow real-time monitoring of intracellular calcium transients in live cells. This technique can assess the impact of negative regulation on calcium influx through HVCCs in response to depolarization.
CRISPR Screening
Genome-wide CRISPR knockout or activation screens coupled with calcium reporters can identify novel genes that negatively regulate HVCCs. Hits can be validated by patch-clamp and imaging. The CAMK1 network was identified through biocomputation, highlighting the power of computational and functional screens.
Proteomics and Interactomics
Affinity purification mass spectrometry (AP-MS) of HVCC subunits can reveal interacting proteins that mediate negative regulation. Phosphoproteomics can identify phosphorylation sites on channels and regulators. These approaches provide a systems-level view of the regulatory network.
How CRISPR Can Be Used to Study GO:1904878 negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel
Knockout
CRISPR knockout of candidate negative regulators (e.g., CAMK1) can determine if their loss increases HVCC activity. This is achieved by generating indels in early exons, leading to frameshift and loss of protein. Knockout cell lines are valuable for validating hits from screens.
Point Mutation
Point mutations can be introduced to mimic or abolish phosphorylation sites on HVCC subunits. For example, mutating a PKA phosphorylation site on CACNA1C can reveal its role in channel inactivation. This requires homology-directed repair with a donor template.
Knock-in
Knock-in of disease-associated mutations (e.g., CACNA1C G406R) into cell lines or iPSCs creates isogenic models for studying altered negative regulation. Tagged knock-in (e.g., GFP) allows visualization and purification of channel complexes.
Overexpression
Overexpression of negative regulators (e.g., CALM1) or HVCC subunits can be achieved by CRISPR activation (CRISPRa) or lentiviral delivery. This helps assess dose-dependent effects on calcium transport.
How EDITGENE Supports negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel Research
Researchers studying negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel-related genes often need to determine whether a candidate gene is causally involved in the regulatory process or is merely correlated. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such causal investigations, from gene knockout to precise point mutations and knock-in models.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel research.
Frequently Asked Questions About negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel
What is GO:1904878?
GO:1904878 is a Gene Ontology biological process term for any process that stops, prevents, or reduces calcium ion transmembrane transport via high voltage-gated calcium channels.
What genes are involved in negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel?
Key genes include CACNA1C, CACNA1D, CACNB2, CALM1, CAMK1, and GNB1, among others.
What are high voltage-gated calcium channels?
High voltage-gated calcium channels are a family of voltage-sensitive calcium channels that activate at high membrane potentials, including L-type, P/Q-type, N-type, and R-type channels.
How is calcium ion transmembrane transport negatively regulated?
It is regulated by phosphorylation, protein-protein interactions, channel internalization, and calcium-dependent feedback inhibition.
What diseases are associated with dysregulation of this process?
Diseases include cardiac arrhythmias, hypertension, neurodegenerative disorders, and cancer.
What is the role of CAMK1 in this process?
CAMK1 is part of a phosphoinositide signal-mediated protein sorting and transport network that may influence HVCC trafficking and function, as suggested by a biocomputation study in hepatocellular carcinoma.
How can CRISPR be used to study this GO term?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of specific genes and residues in HVCC regulation.
What methods measure HVCC activity?
Patch-clamp electrophysiology and calcium imaging are the primary methods to measure HVCC activity and its regulation.
What are synonyms for GO:1904878?
Synonyms include down regulation of generation of L-type calcium current, inhibition of generation of L-type calcium current, and negative regulation of generation of L-type calcium current.
Why is negative regulation of HVCC important for health?
It prevents calcium overload, which can cause cell death and contribute to arrhythmias, neurodegeneration, and other diseases.
Conclusion
GO:1904878, negative regulation of calcium ion transmembrane transport via high voltage-gated calcium channel, is a critical biological process that maintains calcium homeostasis and protects cells from calcium overload. Its dysregulation is implicated in a wide range of diseases, from cardiac arrhythmias to cancer. Understanding the molecular players and mechanisms, such as the CAMK1 network, provides opportunities for therapeutic intervention. CRISPR-based models are indispensable for dissecting this process and validating new targets. EDITGENE offers comprehensive services to support such research, from knockout to bioinformatics.
References
- 1. Wang L et al.. 2014. CAMK1 phosphoinositide signal-mediated protein sorting and transport network in human hepatocellular carcinoma (HCC) by biocomputation.. Cell Biochem Biophys 70(2):1011-6 PMID: 24825433
