Globus Pallidus externa (GPe) Neurons
<table class="infobox infobox-celltype">
<tr>
<th class="infobox-header" colspan="2">Globus Pallidus externa (GPe) Neurons</th>
</tr>
<tr>
<td class="label">Allen Atlas ID</td>
<td><a href="https://portal.brain-map.org/atlases-and-data/rnaseq" target="_blank">CS202210140_3528</a></td>
</tr>
<tr>
<td class="label">Lineage</td>
<td>Neuron > GABAergic > Basal ganglia indirect pathway</td>
</tr>
<tr>
<td class="label">Markers</td>
<td>GAD1, GAD2, PPP1R1B, NPY, PV</td>
</tr>
<tr>
<td class="label">Brain Regions</td>
<td>Globus pallidus externa</td>
</tr>
<tr>
<td class="label">Disease Vulnerability</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntingtons)</td>
</tr>
</table>
Globus Pallidus externa (GPe) Neurons
Introduction
Globus Pallidus Externa (Gpe) Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
...Globus Pallidus externa (GPe) Neurons
<table class="infobox infobox-celltype">
<tr>
<th class="infobox-header" colspan="2">Globus Pallidus externa (GPe) Neurons</th>
</tr>
<tr>
<td class="label">Allen Atlas ID</td>
<td><a href="https://portal.brain-map.org/atlases-and-data/rnaseq" target="_blank">CS202210140_3528</a></td>
</tr>
<tr>
<td class="label">Lineage</td>
<td>Neuron > GABAergic > Basal ganglia indirect pathway</td>
</tr>
<tr>
<td class="label">Markers</td>
<td>GAD1, GAD2, PPP1R1B, NPY, PV</td>
</tr>
<tr>
<td class="label">Brain Regions</td>
<td>Globus pallidus externa</td>
</tr>
<tr>
<td class="label">Disease Vulnerability</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntingtons)</td>
</tr>
</table>
Globus Pallidus externa (GPe) Neurons
Introduction
Globus Pallidus Externa (Gpe) Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
Mermaid diagram (expand to render)
Globus Pallidus externa (GPe) Neurons are a specialized cell type classified within the Neuron > GABAergic > Basal ganglia indirect pathway lineage. These cells are primarily found in Globus pallidus externa and are characterized by expression of marker genes including GAD1, GAD2, PPP1R1B, NPY. They are selectively vulnerable in Parkinson's Disease, Huntington's Disease.
Morphology and Markers
Globus Pallidus externa (GPe) Neurons are identified by the expression of the following key marker genes:
These markers are used for immunohistochemical identification and single-cell RNA sequencing classification, as catalogued in the [Allen Cell Type Atlas](https://portal.brain-map.org/atlases-and-data/rnaseq).
Normal Function
Globus Pallidus externa (GPe) Neurons play essential roles in neural circuits and brain function. They are found in the following brain regions:
Their normal functions include maintaining neural circuit integrity, signal processing, and contributing to the homeostasis of their local microenvironment.
Vulnerability in Disease
Globus Pallidus externa (GPe) Neurons show selective vulnerability in the following neurodegenerative conditions:
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Huntington's Disease](/diseases/huntingtons-disease)
The selective vulnerability of these cells is an active area of research, with factors including metabolic demands, calcium handling, exposure to toxic protein aggregates, and cell-autonomous gene expression programs contributing to their susceptibility.
Transcriptomic Profile
Single-cell and single-nucleus RNA sequencing studies have revealed the transcriptomic signature of Globus Pallidus externa (GPe) Neurons. Key differentially expressed genes from the Allen Cell Type Atlas and related datasets include the marker genes listed above. These transcriptomic profiles help identify subtypes and disease-associated gene expression changes.
Key Publications
[GPe circuit dysfunction in Parkinson's disease](https://doi.org/10.1038/s41593-022-01104-5). Nat Neurosci, 2022.
External Links
- Allen Cell Type Atlas: [https://portal.brain-map.org/atlases-and-data/rnaseq](https://portal.brain-map.org/atlases-and-data/rnaseq)
- Allen Human Brain Atlas: [https://human.brain-map.org/](https://human.brain-map.org/)
- [Cell Types Index](/cell-types)- [Diseases Index](/diseases)eases Index
- [Mechanisms Index](/mechanisms) --
Background
The study of Globus Pallidus Externa (Gpe) Neurons 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.
GPe in Parkinson's Disease
The external segment of the globus pallidus (GPe) is a central hub in the basal ganglia indirect pathway. In Parkinson's disease, decreased dopaminergic inhibition leads to abnormal GPe activity that contributes to motor dysfunction[@bugalho2012].
Pathway alterations in PD
In the PD state:
- Reduced dopamine causes increased striatal D2 receptor activity
- This enhances inhibition of GPe neurons
- GPe activity becomes irregular and oscillatory
- These changes contribute to excessive STN and GPi excitation[@bevan2002]
GPe in Dystonia
Dystonia is associated with altered GPe activity. Reduced GPe output leads to excessive thalamocortical drive and abnormal movements. GPe-DBS has shown efficacy in treating dystonia[@huebl2015].
Molecular Characteristics
GPe neurons express:
- GAD1/GAD2 (GABA synthesis)
- PV (Parvalbumin)
- Calbindin
- Various ion channels (Kv3.1, HCN)
Circuit Interactions
The GPe receives input from:
- Striatum (indirect pathway D2-MSNs)
- Subthalamic nucleus (STN)
The GPe provides output to:
- Subthalamic nucleus
- Striatum (indirect feedback)
- GPi
Therapeutic Targets
GPe Deep Brain Stimulation
GPe stimulation is effective for both PD and dystonia, often with fewer side effects than GPi stimulation[@liu2023].
Pharmacological Approaches
Dopaminergic medications indirectly modulate GPe activity through their effects on striatal neurons[@corbit2016].
References
Page auto-generated from NeuroWiki cell type database. Last updated: 2026-02-26.