TRPC7

TRPC7

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPC7</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPC7</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily C Member 7</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q32</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>16409</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000069020</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9HCX6</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>793 amino acids</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel, TRP family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

TRPC7 (Transient Receptor Potential Cation Channel Subfamily C Member 7) encodes a calcium-permeable non-selective cation channel that belongs to the TRPC (Transient Receptor Potential Canonical) family of ion channels. TRPC7 is the most recently characterized member of the TRPC3/6/7 subfamily and displays unique pharmacological and biophysical properties[^1]. This channel is expressed in various tissues including brain, heart, lung, and skin, where it participates in diverse physiological processes ranging from neuronal signaling to cardiac function.

TRPC7

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPC7</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPC7</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily C Member 7</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q32</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>16409</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000069020</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9HCX6</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>793 amino acids</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Ion channel, TRP family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

TRPC7 (Transient Receptor Potential Cation Channel Subfamily C Member 7) encodes a calcium-permeable non-selective cation channel that belongs to the TRPC (Transient Receptor Potential Canonical) family of ion channels. TRPC7 is the most recently characterized member of the TRPC3/6/7 subfamily and displays unique pharmacological and biophysical properties[^1]. This channel is expressed in various tissues including brain, heart, lung, and skin, where it participates in diverse physiological processes ranging from neuronal signaling to cardiac function.

In the central nervous system, TRPC7 contributes to neuronal calcium homeostasis, synaptic plasticity, and cellular responses to pathological stimuli. Emerging research suggests that TRPC7 dysfunction may play a role in neurodegenerative diseases including Alzheimer's disease (AD) and Parkinson's disease (PD)[^2][^3].

Gene Information

Molecular Structure and Function

Channel Architecture

TRPC7 shares the general architecture of TRPC channels, consisting of:

• N-terminal domain: Contains four ankyrin repeats involved in protein-protein interactions and channel regulation
• Pre-S6 domain: Contains multiple phosphorylation sites
• Transmembrane domain: Six transmembrane segments (S1-S6) forming the pore structure
• C-terminal domain: Contains a TRP box motif and multiple regulatory regions

Gating Mechanisms

TRPC7 can be activated through multiple mechanisms:

Ion Selectivity and Conductance

TRPC7 displays moderate calcium permeability (P_Ca/P_Na ≈ 2-5) and conducts monovalent cations including Na⁺ and K⁺. The channel exhibits:

• Reversal potential: Approximately +10 mV under physiological conditions
• Single-channel conductance: ~50 pS for Na⁺
• Voltage dependence: Weak voltage dependence with shallow activation curve

Expression in the Brain

Neuronal Expression

TRPC7 is expressed in multiple neuronal populations throughout the brain[^6][^7]:

• Cerebellum: High expression in granule cells and Purkinje cells
• Hippocampus: Present in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
• Cerebral cortex: Expressed in layer V pyramidal neurons and cortical interneurons
• Basal ganglia: Detected in medium spiny neurons of the striatum and dopaminergic neurons of substantia nigra
• Thalamus: Expressed in relay neurons

Glial Expression

TRPC7 is also expressed in non-neuronal cells of the nervous system[^8][^9]:

• Microglia: TRPC7 is expressed in microglial cells where it regulates cytokine production and migration
• Astrocytes: Detected in astrocytic processes and cell bodies, with upregulated expression during reactive gliosis

Role in Neuronal Physiology

Calcium Signaling

TRPC7 contributes to neuronal calcium dynamics in several ways[^10]:

• Calcium influx pathway: Provides a depolarizing influx pathway for Ca²⁺ entry
• Calcium oscillations: Mediates repetitive calcium oscillations in response to ATP and other stimuli
• Integration with other calcium channels: Forms functional complexes with NMDA receptors and voltage-gated calcium channels
• Calcium homeostasis: Contributes to maintenance of intracellular calcium balance

Synaptic Plasticity

TRPC7 plays important roles in activity-dependent synaptic modification[^7]:

• Presynaptic function: Regulates neurotransmitter release through modulation of presynaptic calcium entry
• Postsynaptic signaling: Contributes to postsynaptic calcium signaling required for LTP and LTD induction
• Synaptic development: Involved in activity-dependent dendritic development and synapse formation

Neuronal Development

During development, TRPC7 participates in critical developmental processes[^11]:

• Neuronal differentiation: Regulates calcium signaling during neuronal differentiation
• Axon guidance: Contributes to growth cone dynamics and axon pathfinding
• Synaptogenesis: Involved in the formation and maturation of synapses

Role in Neurodegeneration

Alzheimer's Disease

TRPC7 dysfunction has been implicated in Alzheimer's disease pathogenesis[^2]:

• Amyloid-beta effects: Aβ exposure alters TRPC7 expression and function in neurons
• Calcium dysregulation: TRPC7-mediated calcium dysregulation contributes to excitotoxic cell death
• Synaptic loss: Impaired TRPC7 signaling contributes to synaptic dysfunction
• Genetic association: Polymorphisms in TRPC7 have been associated with AD risk in GWAS studies

Parkinson's Disease

In Parkinson's disease, TRPC7 shows altered expression and function in vulnerable brain regions[^3]:

• Dopaminergic neurons: TRPC7 is expressed in substantia nigra dopaminergic neurons and modulates their excitability
• Calcium dysregulation: Altered TRPC7 function contributes to calcium dysregulation in PD
• Oxidative stress: TRPC7 is involved in oxidative stress responses in dopaminergic neurons
• Therapeutic potential: TRPC7 modulators may provide neuroprotection in PD

Neuroprotection and Cell Death

TRPC7 participates in both protective and pathological cellular responses[^12]:

• Oxidative stress response: TRPC7 activation can protect neurons from oxidative damage
• Excitotoxicity: Excessive TRPC7 activation contributes to glutamate-induced excitotoxicity
• Neuroinflammation: TRPC7 in microglia modulates inflammatory responses

Therapeutic Implications

Channel Modulators

TRPC7 represents a potential therapeutic target for neurodegenerative diseases:

• TRPC7 agonists: Compounds that activate TRPC7 may provide neuroprotection through enhanced calcium signaling
• TRPC7 antagonists: Blockers may reduce excitotoxicity and neuroinflammatory responses

Drug Development Challenges

Development of TRPC7-targeted therapeutics faces several challenges:

• Isoform selectivity: Achieving selectivity for TRPC7 over related TRPC3/6 channels
• Blood-brain barrier penetration: Ensuring CNS penetration for neurological applications
• Complex physiology: Balancing beneficial versus detrimental effects of channel modulation

Protein Interactions

Interacting Partners

TRPC7 interacts with multiple proteins:

• TRPC3/6: Forms heteromeric channels with related family members
• Homer proteins: Scaffold at postsynaptic sites
• IP3 receptors: Coordinate with intracellular calcium release
• NMDA receptors: Functional coupling in hippocampal neurons
• PKC isoforms: Regulate channel activity through phosphorylation
• PI3K: Downstream signaling from channel activation

Signaling Complexes

TRPC7 participates in several signaling complexes:

Structural Features

Channel Domains

TRPC7 contains characteristic domains:

• Ankyrin repeats (N-terminus): Four ankyrin repeats for protein interactions
• Pre-S6 domain: Multiple regulatory phosphorylation sites
• Transmembrane domain: Six helices forming the pore
• TRP domain (C-terminus): Conserved gating mechanism

Gating Regulation

Multiple mechanisms regulate TRPC7 gating:

• DAG sensitivity: Direct activation by diacylglycerol
• Calcium-dependent: Both activation and inactivation
• Voltage dependence: Weakly voltage-dependent
• Phosphorylation: PKC-mediated enhancement

Animal Models

Knockout Studies

TRPC7 knockout mice have been characterized:

• Viable: Mice are born at expected ratios
• Cerebellar deficits: Impaired cerebellar function
• Behavioral changes: Altered anxiety and exploration
• Calcium signaling: Defective calcium oscillations

Transgenic Models

Transgenic and knock-in models:

• Reporter lines: Fluorescent protein-tagged TRPC7
• Conditional KO: Tissue-specific deletion
• Humanized models: Human TRPC7 expression

Disease Mechanisms

Molecular Pathways

TRPC7 dysfunction affects multiple pathways:

Cellular Consequences

TRPC7 dysregulation leads to:

• Neuronal dysfunction: Altered excitability and signaling
• Glial activation: Reactive gliosis in response to injury
• Synaptic loss: Impaired synaptic plasticity
• Cell death: Both apoptotic and necrotic pathways

Protein Interactions

Interacting Partners

TRPC7 interacts with multiple proteins:

• TRPC3/6: Forms heteromeric channels with related family members
• Homer proteins: Scaffold at postsynaptic sites
• IP3 receptors: Coordinate with intracellular calcium release
• NMDA receptors: Functional coupling in hippocampal neurons
• PKC isoforms: Regulate channel activity through phosphorylation
• PI3K: Downstream signaling from channel activation

Signaling Complexes

TRPC7 participates in several signaling complexes:

Structural Features

Channel Domains

TRPC7 contains characteristic domains:

• Ankyrin repeats (N-terminus): Four ankyrin repeats for protein interactions
• Pre-S6 domain: Multiple regulatory phosphorylation sites
• Transmembrane domain: Six helices forming the pore
• TRP domain (C-terminus): Conserved gating mechanism

Gating Regulation

Multiple mechanisms regulate TRPC7 gating:

• DAG sensitivity: Direct activation by diacylglycerol
• Calcium-dependent: Both activation and inactivation
• Voltage dependence: Weakly voltage-dependent
• Phosphorylation: PKC-mediated enhancement

Animal Models

Knockout Studies

TRPC7 knockout mice have been characterized:

• Viable: Mice are born at expected ratios
• Cerebellar deficits: Impaired cerebellar function
• Behavioral changes: Altered anxiety and exploration
• Calcium signaling: Defective calcium oscillations

Transgenic Models

Transgenic and knock-in models:

• Reporter lines: Fluorescent protein-tagged TRPC7
• Conditional KO: Tissue-specific deletion
• Humanized models: Human TRPC7 expression

Disease Mechanisms

Molecular Pathways

TRPC7 dysfunction affects multiple pathways:

Cellular Consequences

TRPC7 dysregulation leads to:

• Neuronal dysfunction: Altered excitability and signaling
• Glial activation: Reactive gliosis in response to injury
• Synaptic loss: Impaired synaptic plasticity
• Cell death: Both apoptotic and necrotic pathways

Research Highlights

• TRPC7 knockout mice are viable but show altered behavior and impaired cerebellar function
• TRPC7 forms heteromeric channels with TRPC3 that display distinct properties from homomeric channels
• TRPC7 is upregulated in response to neuronal injury and may participate in compensatory neuroprotective responses

Summary

TRPC7 encodes a calcium-permeable cation channel with broad expression throughout the central nervous system. This channel participates in neuronal calcium signaling, synaptic plasticity, and cellular responses to pathological stimuli. TRPC7 dysfunction has been implicated in Alzheimer's disease, Parkinson's disease, and neuroinflammatory conditions. The channel represents a potential therapeutic target for neurodegenerative diseases.

See Also

• [TRPC3](/genes/trpc3)
• [TRPC6](/genes/trpc6)
• [Calcium Signaling](/mechanisms/calcium-signaling-dysregulation)
• [TRP Channels](/mechanisms/trp-channels)
• [Alzheimer's Disease Mechanisms](/mechanisms/alzheimers-disease-mechanisms)
• [Parkinson's Disease Mechanisms](/mechanisms/parkinsons-disease-mechanisms)

References

[^1]: Unknown et al. Far-infrared irradiation suppresses pyroptosis in ischemic flaps through TRPV3-mediated activation of the A2AR/EPAC1/.... Cellular signalling. 2026. PMID:41354356.
[^2]: Alice et al. Duloxetine ameliorates cerebral ischemic injury by inhibiting autophagy.. Autophagy. 2026. PMID:41787744.
[^3]: Unknown et al. TRPM2-dependent autophagy inhibition exacerbates oxidative stress-induced CXCL16 secretion by keratinocytes in vitiligo.. The Journal of pathology. 2024. PMID:38186269.
[^4]: Unknown et al. Live imaging of intra-lysosome pH in cell lines and primary neuronal culture using a novel genetically encoded biosen.... Autophagy. 2021. PMID:32515674.
[^5]: Jiang et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2008.
[^6]: Phelan et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2013.
[^7]: Lipstein et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2012.
[^8]: Kher et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2008.
[^9]: Schilling et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2010.
[^10]: Sugaawa et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2007.
[^11]: Berquez et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2015.
[^12]: Fone et al. Role of riccio2002 in neurodegeneration. J Neurosci. 2008.