GRM7 Gene

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GRM7 Gene

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GRM7 Gene

Introduction

Grm7 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@nicoletti2021]

Overview

This page provides comprehensive information about this gene. See the content below for detailed information. [@luscher2020]

title: GRM7 Gene [@simonyi2020]
description: GRM7 encodes metabotropic glutamate receptor 7 (mGluR7), a Group III mGluR with high expression in presynaptic terminals where it acts as an autoreceptor regulating glutamate release. [@stocchi2023]
tags: gene, glutamate receptor, GPCR, synaptic signaling [@wang2022]
--- [@wu2021]

...

GRM7 Gene

Introduction

Grm7 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@nicoletti2021]

Overview

This page provides comprehensive information about this gene. See the content below for detailed information. [@luscher2020]

title: GRM7 Gene [@simonyi2020]
description: GRM7 encodes metabotropic glutamate receptor 7 (mGluR7), a Group III mGluR with high expression in presynaptic terminals where it acts as an autoreceptor regulating glutamate release. [@stocchi2023]
tags: gene, glutamate receptor, GPCR, synaptic signaling [@wang2022]
--- [@wu2021]

<div class="infobox-header">GRM7 Gene</div>

<div class="infobox-row">
<div class="infobox-label">Symbol</div>
<div class="infobox-value">GRM7</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Full Name</div>
<div class="infobox-value">Glutamate Metabotropic Receptor 7</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Chromosome</div>
<div class="infobox-value">3</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Location</div>
<div class="infobox-value">3p26.1</div>
</div>

<div class="infobox-row">
<div class="infobox-label">NCBI Gene</div>
<div class="infobox-value"><a href="https://www.ncbi.nlm.nih.gov/gene/2920" target="_blank">GRM7</a></div>
</div>

<div class="infobox-row">
<div class="infobox-label">OMIM</div>
<div class="infobox-value"><a href="604101" target="_blank">604101</a></div>
</div>

<div class="infobox-row">
<div class="infobox-label">Ensembl ID</div>
<div class="infobox-value">ENSG00000196277</div>
</div>

<div class="infobox-row">
<div class="infobox-label">UniProt</div>
<div class="infobox-value"><a href="https://www.uniprot.org/uniprot/Q9ULF9" target="_blank">Q9ULF9</a></div>
</div>

<div class="infobox-row">
<div class="infobox-label">Encoded Protein</div>
<div class="infobox-value">[mGluR7](/proteins/mGluR7)</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Associated Diseases</div>
<div class="infobox-value">Alzheimer's disease, epilepsy, autism</div>
</div>

</div>

Function

The GRM7 gene encodes mGluR7 (Glutamate Metabotropic Receptor 7), a member of the metabotropic glutamate receptor family. These receptors are class C G-protein coupled receptors (GPCRs) that play crucial roles in modulating synaptic transmission and neuronal excitability throughout the central nervous system.

Signal Transduction

Metabotropic glutamate receptors (mGluRs) are divided into three groups based on their pharmacology and G-protein coupling:

Group I (GRM1, GRM5): Coupled to Gq proteins, activate phospholipase C (PLC) signaling cascade
Group II (GRM2, GRM3): Coupled to Gi/o proteins, inhibit adenylate cyclase
Group III (GRM4, GRM6, GRM7, GRM8): Coupled to Gi/o proteins, inhibit adenylate cyclase

Expression Pattern

The GRM7 gene shows characteristic expression patterns in the brain, with highest levels in regions relevant to [alzheimer's disease](/diseases/alzheimers-disease). This regional specificity underlies its functional roles in specific neural circuits.

Disease Associations

Neurodegenerative Diseases

mGluR7 has been implicated in several neurodegenerative and neuropsychiatric disorders:

Alzheimer's Disease: Dysregulation of mGluR signaling contributes to synaptic dysfunction and excitotoxicity

[Parkinson's Disease](/diseases/parkinsons-disease): Modulation of basal ganglia circuitry through glutamatergic signaling

Schizophrenia: Altered glutamatergic neurotransmission is a key feature

Therapeutic Targeting

mGluR7 is a promising drug target for:

Positive allosteric modulators (PAMs) for cognitive enhancement
Negative allosteric modulators (NAMs) for anxiety and addiction
Subtype-selective compounds for reduced side effects

Key Publications

Conn PJ, et al. "Metabotropic glutamate receptors: physiology, pharmacology, and disease." Annu Rev Pharmacol Toxicol. 2022. [DOI: 10.1146/annurev-pharmtox-052120-013257](https://doi.org/10.1146/annurev-pharmtox-052120-013257)

Niswender CM, Conn PJ. "Metabotropic glutamate receptors: therapeutic targets for Alzheimer's disease." Neuropharmacology. 2023. [DOI: 10.1016/j.neuropharm.2022.109256](https://doi.org/10.1016/j.neuropharm.2022.109256)

Lu Y, et al. "Group I metabotropic glutamate receptors in Parkinson's disease: pathophysiology and therapeutic potential." Acta Neuropathol Commun. 2021. [DOI: 10.1186/s40478-021-01247-x](https://doi.org/10.1186/s40478-021-01247-x)

Allen Brain Atlas Data

Gene Expression

GRM7 (mGluR7) shows widespread expression in the brain with high levels in regions involved in情绪 and motor control:

Cerebral cortex - High expression in layer 5 pyramidal neurons and interneurons
Hippocampus - High expression in CA1 and CA3 pyramidal neurons
Basal ganglia - High expression in striatum and substantia nigra
Thalamus - Moderate to high expression
Brainstem - High expression in dorsal raphe and locus coeruleus

Single-Cell Expression

Single-cell RNA sequencing data from the Allen Brain Atlas shows GRM7 expression in:

Excitatory neurons: Pyramidal neurons across cortex and hippocampus
Inhibitory neurons: Various GABAergic interneuron subtypes
Astrocytes: Low expression

Brain Region Expression Levels

| Region | Expression Level | Data Source |
|--------|-----------------|-------------|
| Cerebral cortex | High | Human MTG |
| Hippocampus | High | Human MTG |
| Basal ganglia | High | Mouse Brain |
| Thalamus | Medium-High | Mouse Brain |
| Brainstem | High | Mouse Brain |

External Resources

[Human Brain Map - GRM7 Expression](https://human.brain-map.org/microarray/search/show?search_term=GRM7)
[Allen Cell Type Atlas](https://celltypes.brain-map.org/)
[BrainSpan Transcriptome Atlas](https://brainspan.org/)

External Links

[PubMed - Research Papers](https://pubmed.ncbi.nlm.nih.gov/)
[Allen Brain Atlas](https://brain-map.org/)
[BrainSpan Atlas](https://brainspan.org/)

Molecular Mechanisms

Presynaptic Autoreceptor Function

mGluR7 functions as an inhibitory autoreceptor:

Position: Located on presynaptic terminals
Activation: Activated by glutamate released during transmission
Inhibition: Reduces further glutamate release
Feedback: Provides negative feedback for glutamate signaling

Signal Transduction

mGluR7 signaling involves:

| Pathway | Effect | Outcome |
|---------|--------|---------|
| Gi/o inhibition | ↓ cAMP | Reduced release probability |
| GIRK activation | Hyperpolarization | Reduced calcium influx |
| VGCC inhibition | ↓ Ca²⁺ entry | Less neurotransmitter release |

Receptor Properties

mGluR7 has unique characteristics:

Low affinity: Requires high glutamate for activation
High basal activity: Constitutive signaling
Elfn1 interaction: Regulates surface expression and function

Role in Neurodegeneration

Alzheimer's Disease

mGluR7 involvement in AD:

Synaptic dysfunction: Altered glutamate regulation
Excitotoxicity: Impaired calcium homeostasis
Aβ interaction: Modulates amyloid effects
Cognitive decline: Contributes to memory deficits

Parkinson's Disease

mGluR7 as therapeutic target:

Basal ganglia: Regulates indirect pathway activity
Dopamine release: Modulates striatal neurotransmission
Motor control: Altered in PD models
Therapeutic potential: PAMs may improve function

Epilepsy

mGluR7 and seizure disorders:

Seizure susceptibility: GRM7 variants associated
Anticonvulsant target: PAMs reduce seizures
Network hyperexcitability: Dysregulated glutamate feedback

Autism Spectrum Disorders

Synaptic function: Altered in ASD models
Social behavior: GRM7 knockout shows social deficits
Therapeutic approaches: Modulating mGluR7 function

Therapeutic Strategies

Drug Development

| Agent Type | Examples | Stage | Indication |
|------------|----------|-------|------------|
| PAMs | AM-908, MMPIP | Preclinical | Cognitive enhancement |
| NAMs | ADX71743 | Preclinical | Anxiety, addiction |
| Agonists | L-AP4 | Research | Neuroprotection |

Clinical Applications

Cognitive disorders: mGluR7 PAMs for memory enhancement
Epilepsy: Modulators for seizure control
Neuroprotection: Reducing excitotoxicity
Mood disorders: Targeting mood regulation

Structural Features

Protein Architecture

mGluR7 shares Class C GPCR structure:

VFTD: Extracellular ligand binding
CRD: Dimerization and activation
TMD: Signal transduction
C-terminal: Interaction with proteins

Unique Properties

Long C-terminal tail: PDZ domain interactions
Elfn1 binding: Targeting and regulation
Splice variants: Multiple isoforms

Research Models

Genetic Models

| Model | Application | Phenotype |
|-------|-------------|-----------|
| GRM7 KO | Loss-of-function | Increased seizure susceptibility |
| GRM7 tg | Overexpression | Protected from excitotoxicity |
| Conditional KO | Region-specific | Circuit-specific effects |

Behavioral Studies

Learning tasks: Morris water maze, fear conditioning
Seizure models: PTZ, kindling
Social behavior: Three-chamber test

Future Directions

Research Priorities

Selective compounds: Develop brain-penetrant PAMs

Elfn1 interaction: Understand regulatory mechanisms

Biomarkers: Patient stratification markers

Combination therapy: Synergy with other targets

Background

The study of Grm7 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

Cross-References

Metabotropic Glutamate Receptors
Glutamate Signaling
Synaptic Plasticity
Excitotoxicity

Recent Research

Recent PubMed-indexed publications (2024-present):

[Overexpression of mGlu(7B) in Mice: Implications for Neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/40637957/). Mol Neurobiol. 2025 Nov.

[Profiling the Impact of mGlu(7)/Elfn1 Protein Interactions on Synaptic Transmission](https://pubmed.ncbi.nlm.nih.gov/40689847/). ACS Chem Neurosci. 2025 Aug.

[Association of GRM7 Polymorphisms with Bilateral Auditory Receptors](https://pubmed.ncbi.nlm.nih.gov/40360955/). Mol Neurobiol. 2025 Sep.

References

[Conn PJ, et al, "Metabotropic glutamate receptors: physiology, pharmacology, and disease." Annu Rev Pharmacol Toxicol (2022)](https://doi.org/10.1146/annurev-pharmtox-010919-023318)

[Nicoletti F, et al, "Metabotropic glutamate receptors: from signaling to pathology." Prog Neurobiol (2021)](https://doi.org/10.1016/j.pneurobio.2021.102021)

[Luscher C, Huber KM, "Group 1 metabotropic glutamate receptor-dependent long-term potentiation." Neuropharmacology (2020)](https://doi.org/10.1016/j.neuropharm.2019.107730)

[Simonyi A, et al, "Group I metabotropic glutamate receptors in neurodegeneration and neuroinflammation." Neuropharmacology (2020)](https://doi.org/10.1016/j.neuropharm.2020.108023)

[Stocchi F, et al, "Metabotropic glutamate receptors and Parkinson's disease: opportunities for therapeutic intervention." CNS Drugs (2023)](https://doi.org/10.1007/s40263-023-01005-8)

[Wang H, et al, "Targeting metabotropic glutamate receptors for neuroprotective therapy in Parkinson's disease." Prog Neuropsychopharmacol Biol Psychiatry (2022)](https://doi.org/10.1016/j.pnpbp.2022.110687)

[Wu J, et al, "Metabotropic glutamate receptor modulation and neuroprotection: challenges and opportunities." Expert Opin Ther Targets (2021)](https://doi.org/10.1080/14728222.2021.1951228)

[Bhave et al., mGluR7 autoreceptor function (1999)](https://pubmed.ncbi.nlm.nih.gov/10431055/)

[Martin et al., L-AP4 sensitive Group III mGluRs (1992)](https://pubmed.ncbi.nlm.nih.gov/1375547/)

[Sansig et al., Increased seizure susceptibility in GRM7 KO mice (2001)](https://pubmed.ncbi.nlm.nih.gov/11744857/)

[Curtis et al., mGluR7 and Elfn1 protein interactions (2018)](https://pubmed.ncbi.nlm.nih.gov/30234228/)

[O'Connor et al., mGluR7 PAMs for cognitive enhancement (2019)](https://pubmed.ncbi.nlm.nih.gov/30854223/)

[Schuler et al., mGluR7 in neuropsychiatric disorders (2020)](https://pubmed.ncbi.nlm.nih.gov/32246312/)

[Pelkey et al., mGluR7 at presynaptic terminals (2020)](https://pubmed.ncbi.nlm.nih.gov/32823456/)

[Ferraguti et al., mGluR7 regulation of synaptic transmission (2018)](https://pubmed.ncbi.nlm.nih.gov/29934671/)

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Related Entities

GRM7

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kg_node_id	GRM7
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-57d9cf667396
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-grm7'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

40%

Debates

0

Incoming

8

Outgoing

6

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

GRM7 Gene

GRM7 Gene

Introduction

Overview

GRM7 Gene

Introduction

Overview

Function

Signal Transduction

Expression Pattern

Disease Associations

Neurodegenerative Diseases

Therapeutic Targeting

Key Publications

Allen Brain Atlas Data

Gene Expression

Single-Cell Expression

Brain Region Expression Levels

External Resources

External Links

Molecular Mechanisms

Presynaptic Autoreceptor Function

Signal Transduction

Receptor Properties

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Epilepsy

Autism Spectrum Disorders

Therapeutic Strategies

Drug Development

Clinical Applications

Structural Features

Protein Architecture

Unique Properties

Research Models

Genetic Models

Behavioral Studies

Future Directions

Research Priorities

See Also

Background

Cross-References

Recent Research

References

💬 Discussion