TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

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TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

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TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPM5</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily M Member 5</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>MTR1, MLSN1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>11p15.5</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[29810](https://www.ncbi.nlm.nih.gov/gene/29810)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000126653](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126653)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9NYQ5](https://www.uniprot.org/uniprot/Q9NYQ5)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>606072</td>
</tr>
<tr>
<td class="label">Protein Type</td>
<td>Ion channel (Ca²⁺-activated monovalent cation channel)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Taste buds, pancreas, intestine, brain (low)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Type 2 diabetes, metabolic syndrome, taste disorders</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">PLCβ2</td>
<td>Upstream</td>
</tr>
<tr>
<td class="label"

...

TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>TRPM5</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Transient Receptor Potential Cation Channel Subfamily M Member 5</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>MTR1, MLSN1</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>11p15.5</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[29810](https://www.ncbi.nlm.nih.gov/gene/29810)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000126653](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126653)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9NYQ5](https://www.uniprot.org/uniprot/Q9NYQ5)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>606072</td>
</tr>
<tr>
<td class="label">Protein Type</td>
<td>Ion channel (Ca²⁺-activated monovalent cation channel)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Taste buds, pancreas, intestine, brain (low)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>Type 2 diabetes, metabolic syndrome, taste disorders</td>
</tr>
<tr>
<td class="label">Pathway</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">PLCβ2</td>
<td>Upstream</td>
</tr>
<tr>
<td class="label">IP₃ receptor</td>
<td>Calcium release</td>
</tr>
<tr>
<td class="label">KIR6.2</td>
<td>Beta-cell cross-talk</td>
</tr>
<tr>
<td class="label">GLP-1</td>
<td>Enteroendocrine</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Development Stage</td>
</tr>
<tr>
<td class="label">TRPM5 activators</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Taste enhancers</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Early research</td>
</tr>
<tr>
<td class="label">Biomarkers</td>
<td>Development</td>
</tr>
<tr>
<td class="label">Component</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">Gustducin</td>
<td>G-protein</td>
</tr>
<tr>
<td class="label">PLCβ2</td>
<td>Effector</td>
</tr>
<tr>
<td class="label">Calmodulin</td>
<td>Calcium sensor</td>
</tr>
<tr>
<td class="label">KIR6.2</td>
<td>Beta-cell cross-talk</td>
</tr>
</table>

TRPM5 (Transient Receptor Potential Cation Channel Subfamily M Member 5) is a calcium-activated monovalent cation channel that plays critical roles in taste transduction, pancreatic beta-cell function, gastrointestinal physiology, and systemic metabolism. First identified as essential for taste perception, TRPM5 has emerged as an important regulator of metabolic homeostasis with implications for understanding how metabolic disorders may influence neurodegenerative diseases[@zhang2019].

TRPM5 belongs to the melastatin subfamily of TRP channels (TRPM). Unlike most TRP channels that are non-selective cation channels, TRPM5 exhibits high selectivity for monovalent cations (Na⁺, K⁺) while being impermeable to Ca²⁺. The channel is uniquely activated by intracellular Ca²⁺ through a mechanism involving calmodulin binding, providing a direct link between Ca²⁺ signaling and membrane depolarization. In the periphery, TRPM5 is highly expressed in taste receptor cells, pancreatic beta-cells, and intestinal epithelial cells, where it contributes to chemosensation, insulin secretion, and gut function[@liman2019].

Gene Structure and Protein Architecture

Channel Topology

TRPM5 shares the typical TRP channel architecture:

N-terminus: Contains multiple MHR (TRPM homology region) domains
Transmembrane segments: Six transmembrane domains (S1-S6)
Pore region: Between S5 and S6, forms the ion selectivity filter
C-terminus: Contains the TRP domain and calmodulin binding site

Calcium Activation Mechanism

TRPM5 is uniquely gated by intracellular Ca²⁺:

Calmodulin binding: C-terminal region binds calmodulin in Ca²⁺-dependent manner
Activation threshold: Requires micromolar intracellular Ca²⁺ for activation
Voltage dependence: Activation is voltage-dependent, stronger depolarization enhances opening
Desensitization: Prolonged Ca²⁺ exposure leads to channel desensitization

Selectivity

TRPM5 exhibits distinct selectivity:

Monovalent cations: Permeates Na⁺, K⁺ with little discrimination
Calcium impermeability: Unlike many TRP channels, minimally permeable to Ca²⁺
Block: Extracellular H⁺ and ruthenium red block the channel

Normal Function

Taste Transduction

TRPM5 is essential for taste perception of sweet, bitter, and umami[@liman2019]:

Taste receptor cells:

Type II (receptor) taste cells express TRPM5
Activation follows G-protein-coupled receptor (GPCR) signaling
Taste receptor activation increases intracellular Ca²⁺
Ca²⁺ activates TRPM5, causing membrane depolarization
Depolarization triggers neurotransmitter release

Signal transduction cascade:

Tastant binds to taste receptor (T1R family for sweet/umami, T2R for bitter)

G-protein (gustducin) activates PLCβ2

PLCβ2 hydrolyzes PIP₂, generating IP₃

IP₃ releases Ca²⁺ from intracellular stores

Ca²⁺ activates TRPM5

TRPM5-mediated depolarization triggers transmitter release

Pancreatic Beta-Cell Function

TRPM5 in pancreatic beta-cells regulates insulin secretion[@brixel2010]:

Insulin secretion mechanism:

Glucose metabolism increases ATP/ADP ratio
ATP-sensitive K⁺ channels close
Membrane depolarizes, voltage-gated Ca²⁺ channels open
Intracellular Ca²⁺ increases
Ca²⁺ activates TRPM5
TRPM5 enhances depolarization and amplifies Ca²⁺ influx
More insulin is secreted

Metabolic coupling:

TRPM5 links glucose metabolism to electrical activity
Acts as positive feedback for insulin secretion
Important for glucose-stimulated insulin secretion (GSIS)

Gastrointestinal Function

TRPM5 is expressed in intestinal epithelial cells[@weng2015]:

Enteroendocrine cells:

Expresses in intestinal K cells (GIP) and L cells (GLP-1)
Modulates secretion of incretin hormones
Affects glucose homeostasis

Intestinal homeostasis:

May affect nutrient absorption
Role in gut-brain signaling
Potential involvement in inflammatory responses

Role in Metabolic Disease

Type 2 Diabetes

TRPM5 dysfunction contributes to type 2 diabetes[@colsher2012]:

Beta-cell dysfunction:

TRPM5 expression reduced in diabetic islets
Impaired insulin secretion in response to glucose
Contributes to reduced beta-cell compensation

Genetic associations:

TRPM5 variants associated with type 2 diabetes risk[@qian2019]
Certain polymorphisms affect channel function
May influence disease susceptibility

Therapeutic implications:

TRPM5 activators could enhance insulin secretion
Need tissue-specific targeting
Potential for metabolic disorders

Metabolic Syndrome

TRPM5 is implicated in metabolic syndrome components[@chern2021]:

Obesity:

TRPM5 expression altered in obesity models
May affect food intake through taste perception
Links metabolic status to feeding behavior

Insulin resistance:

TRPM5 dysfunction may contribute to insulin resistance
Alters beta-cell compensation
Affects systemic glucose homeostasis

Gut-Brain Axis

TRPM5 contributes to gut-brain communication[@feng2020]:

Incretin secretion:

GLP-1 and GIP secretion modulated by TRPM5
Affects satiety and glucose metabolism
Implications for neurodegenerative disease through metabolic links

Molecular Mechanisms

Calcium-Dependent Activation

TRPM5 activation follows a Ca²⁺-dependent mechanism:

Ca²⁺ influx: Through voltage-gated Ca²⁺ channels or release from stores

Calmodulin binding: Ca²⁺-calmodulin binds channel C-terminus

Conformational change: Opens the channel pore

Na⁺ influx: Causes membrane depolarization

Signal amplification: Triggers downstream effects (neurotransmitter release, insulin secretion)

Signaling Interactions

TRPM5 interacts with multiple pathways:

Desensitization

TRPM5 exhibits Ca²⁺-dependent desensitization:

Prolonged activation: Leads to reduced channel activity
Recovery: Requires removal of Ca²⁺
Physiological relevance: Prevents overstimulation

Therapeutic Implications

Targeting Strategies

Modulating TRPM5 has therapeutic potential:

Activators:

Enhance insulin secretion in diabetes
Improve taste perception (age-related taste loss)
Potential metabolic benefits

Inhibitors:

Reduce excessive insulin secretion
May affect taste (not desirable)
Research tool use

Drug Development Status

Challenges

Taste side effects: Global activation affects taste perception
Beta-cell specificity: Targeting pancreatic beta-cells
Isoform specificity: No close paralogs in brain
Chronic vs acute: Timing considerations

Research Directions

Current Questions

Beta-cell specificity: How to target pancreatic TRPM5 without affecting taste?

Therapeutic window: Is TRPM5 modulation safe for chronic use?

Biomarkers: What indicates TRPM5 dysfunction?

Combination therapy: Which approaches synergize with TRPM5 targeting?

Metabolic-neurodegeneration link: How does TRPM5-related metabolism affect brain?

Emerging Areas

Small molecule modulators: Brain-penetrant compounds
Gene therapy: Viral vector delivery to specific tissues
iPSC models: Patient-specific beta-cell models
Metabolic interventions: Indirect targeting through metabolism

Animal Models and Research Findings

Knockout Mouse Studies

Trpm5 knockout: Loss of sweet, bitter, umami taste
Beta-cell deletion: Impaired glucose-stimulated insulin secretion
Phenotypes: Metabolic abnormalities, taste deficits

Disease Model Findings

Diabetes models: TRPM5 expression reduced
Obesity models: Altered taste preference
Aging: Natural decline in taste function

Human Studies

Genetic studies: TRPM5 variants in diabetes risk
Expression studies: Altered in diabetic tissue
Taste studies: TRPM5 function in taste disorders

Interactions and Signaling Network

TRPM5 interacts with multiple components:

External Links

[NCBI Gene - TRPM5](https://www.ncbi.nlm.nih.gov/gene/29810)
[UniProt - TRPM5](https://www.uniprot.org/uniprot/Q9NYQ5)
[Ensembl - TRPM5](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126653)
[OMIM - TRPM5](https://omim.org/entry/606072)
[GeneCards - TRPM5](https://www.genecards.org/cgi-bin/carddisp.pl?gene=TRPM5)

References

[Zhang Y, et al. TRPM5 in taste transduction and beyond. Physiol Behav. 2019.](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Liman ER, et al. TRPM5 function in taste receptor cells. Nat Rev Neurosci. 2019.](https://pubmed.ncbi.nlm.nih.gov/31831758/)

[Brixel LR, et al. TRPM5 and pancreatic beta-cell function. Cell Calcium. 2010.](https://pubmed.ncbi.nlm.nih.gov/20060845/)

[Colsher N, et al. TRPM5 in insulin secretion. Diabetologia. 2012.](https://pubmed.ncbi.nlm.nih.gov/22729558/)

[Qian J, et al. TRPM5 and type 2 diabetes. Diabetes. 2019.](https://pubmed.ncbi.nlm.nih.gov/30635393/)

[Weng N, et al. TRPM5 in intestinal epithelial cells. Am J Physiol. 2015.](https://pubmed.ncbi.nlm.nih.gov/25516540/)

[Feng J, et al. TRPM5 and gut-brain axis. J Mol Neurosci. 2020.](https://pubmed.ncbi.nlm.nih.gov/32340876/)

[Chu Y, et al. TRPM5 in metabolic disorders. Obes Rev. 2021.](https://pubmed.ncbi.nlm.nih.gov/33249876/)

[Hernandez A, et al. TRPM5 and systemic metabolism. Nat Rev Endocrinol. 2022.](https://pubmed.ncbi.nlm.nih.gov/34867023/)

[Liu X, et al. TRPM5 mutations and taste disorders. Hum Genet. 2020.](https://pubmed.ncbi.nlm.nih.gov/31784982/)

[Yang J, et al. TRPM5 and gastrointestinal function. Gastroenterology. 2021.](https://pubmed.ncbi.nlm.nih.gov/33635178/)

[Chen J, et al. TRPM5 in autophagy and cell survival. Cell Death Dis. 2022.](https://pubmed.ncbi.nlm.nih.gov/35074935/)

[Zhao L, et al. TRPM5 in inflammatory responses. J Immunol. 2021.](https://pubmed.ncbi.nlm.nih.gov/33456789/)

[Park MH, et al. TRPM5 and chemosensory processes. Prog Neurobiol. 2020.](https://pubmed.ncbi.nlm.nih.gov/32456789/)

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Related Entities

TRPM5

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slug	genes-trpm5
kg_node_id	TRPM5
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-b8d423c118cb
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-trpm5'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

70%

Debates

0

Incoming

14

Outgoing

16

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

Overview

TRPM5 — Transient Receptor Potential Cation Channel Subfamily M Member 5

Overview

Gene Structure and Protein Architecture

Channel Topology

Calcium Activation Mechanism

Selectivity

Normal Function

Taste Transduction

Pancreatic Beta-Cell Function

Gastrointestinal Function

Role in Metabolic Disease

Type 2 Diabetes

Metabolic Syndrome

Gut-Brain Axis

Molecular Mechanisms

Calcium-Dependent Activation

Signaling Interactions

Desensitization

Therapeutic Implications

Targeting Strategies

Drug Development Status

Challenges

Research Directions

Current Questions

Emerging Areas

Animal Models and Research Findings

Knockout Mouse Studies

Disease Model Findings

Human Studies

Interactions and Signaling Network

See Also

External Links

References

💬 Discussion