GNAI2 Gene

GNAI2 Gene

Introduction

Gnai2 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.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.2em;">GNAI2 Gene</th></tr>
<tr><td><strong>Full Name</strong></td><td>G Protein Subunit Alpha I2</td></tr>
<tr><td><strong>Chromosome</strong></td><td>3p21.31</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2771](https://www.ncbi.nlm.nih.gov/gene/2771)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[139310](https://www.omim.org/entry/139310)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000128283</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P04899](https://www.uniprot.org/uniprot/P04899)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Early-onset epilepsy, Intellectual disability, Autism spectrum disorder, Parkinson's Disease</td></tr>
</table>
</div>

Overview

GNAI2 Gene

Introduction

Gnai2 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.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.2em;">GNAI2 Gene</th></tr>
<tr><td><strong>Full Name</strong></td><td>G Protein Subunit Alpha I2</td></tr>
<tr><td><strong>Chromosome</strong></td><td>3p21.31</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2771](https://www.ncbi.nlm.nih.gov/gene/2771)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[139310](https://www.omim.org/entry/139310)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000128283</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P04899](https://www.uniprot.org/uniprot/P04899)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Early-onset epilepsy, Intellectual disability, Autism spectrum disorder, Parkinson's Disease</td></tr>
</table>
</div>

Overview

The GNAI2 gene encodes the G Protein Subunit Alpha I2 (Galphai2), a member of the Gi/o family of heterotrimeric G protein alpha subunits. Galphai2 is a key inhibitory G protein that suppresses adenylyl cyclase activity, regulates ion channels, and modulates intracellular signaling cascades. It is widely expressed in the nervous system and plays crucial roles in neuronal signal transduction, synaptic plasticity, and cellular homeostasis["@gnai"].

Function

Gαi2 is an inhibitory G protein that mediates signaling from various G protein-coupled receptors (GPCRs):

Primary Signaling Pathways

• Activates G protein-gated inwardly rectifying potassium (GIRK) channels
• Modulates voltage-gated calcium channels
• Regulates neuronal excitability

Molecular Mechanisms

Structural Features

Gαi2 shares the canonical Gα subunit structure:

• GTPase domain: Contains the nucleotide-binding pocket and hydrolyzes GTP
• Switch regions I-III: Conformational changes enable effector interactions
• N-terminal helix: Mediates interaction with Gβγ dimer and membrane association

Key Differences from Gs/Go Families

| Feature | Gαi2 | Gαs | Gαo |
|---------|------|-----|-----|
| Adenylyl cyclase effect | Inhibition | Stimulation | Inhibition |
| Primary effectors | GIRK, PI3K | PKA | GIRK, VDCC |
| Neuronal expression | High | Moderate | Very High |

Tissue Distribution

GNAI2 shows widespread expression:

• Central nervous system: High in [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia, cerebellum
• Peripheral nervous system: Autonomic ganglia, sensory [neurons](/entities/neurons)
• Endocrine system: Pituitary, adrenal gland
• Immune system: T cells, B cells, macrophages

Disease Associations

Early-Onset Epilepsy

Intellectual Disability

Autism Spectrum Disorder

Alzheimer's Disease

Parkinson's Disease

Therapeutic Implications

Drug Targets

| Target | Drug Class | Therapeutic Potential |
|--------|-----------|---------------------|
| Gαi2 | GDP analogs | Research tool |
| GIRK channels | Activators (flupirtine) | Neuroprotection |
| Adenylyl cyclase | Modulators | Cognitive enhancement |
| β-arrestin | Biased ligands | Targeted therapy |

Therapeutic Strategies

Research Directions

Key Publications

See Also

• [G Proteins](/mechanisms/g-proteins)
• [GPCR Signaling](/mechanisms/gpcr-signaling)
• [Adenylyl Cyclase Pathway](/mechanisms/adenylyl-cyclase-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Epilepsy](/diseases/epilepsy)
• [Autism Spectrum Disorder](/diseases/autism-spectrum-disorder)

External Links

• [NCBI Gene: GNAI2](https://www.ncbi.nlm.nih.gov/gene/2771)
• [UniProt: GNAI2](https://www.uniprot.org/uniprot/P04899)
• [Ensembl: GNAI2](https://www.ensembl.org/Homo_sapiens/Gene/Info?g=ENSG00000128283)
• [OMIM: GNAI2](https://www.omim.org/entry/139310)

Background

The study of Gnai2 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.

Brain Atlas Resources

• [Allen Human Brain Atlas — GNAI2 Expression](https://human.brain-map.org/microarray/search/show?search_term=GNAI2): Gene expression data in human brain
• [Allen Mouse Brain Atlas — GNAI2](https://mouse.brain-map.org/search/show?search_term=GNAI2): Mouse brain expression data
• [BrainSpan — GNAI2 Developmental Transcriptome](https://brainspan.org/lair/list?gene=GNAI2): Developmental expression data

References

Pathway Diagram

The following diagram shows the key molecular relationships involving GNAI2 Gene discovered through SciDEX knowledge graph analysis: