OPA3 Gene

OPA3 Gene

Introduction

Opa3 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.

--- [@mitochondrial2018]
title: OPA3 [@opa2019]
--- [@methylglutaconic2020]

--- [@mitochondrial2021]
title: OPA3 [@opa2022]
--- [@targeting2023]

<div class="infobox infobox-gene"> [@gene2024]
<table>
<tr><th colspan="2" style="background:#f8f9fa; text-align:center;">OPA3 - OPA3 mitochondrial outer membrane protein</th></tr>
<tr><td><b>Gene Symbol</b></td><td>OPA3</td></tr>
<tr><td><b>Full Name</b></td><td>OPA3 mitochondrial outer membrane protein</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>19q13.32</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[80207](https://www.ncbi.nlm.nih.gov/gene/80207)</td></tr>
<tr><td><b>OMIM</b></td><td>[606580](https://www.omim.org/entry/606580)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000142046](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000142046)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9H3K1](https://www.uniprot.org/uniprot/Q9H3K1)</td></tr>
<tr><td><b>Associated Diseases</b></td><td>Optic atrophy with cataract</td></tr>
</table>
</div>

Overview

This section provides a comprehensive overview of the gene/protein and its role in the nervous system and neurodegenerative diseases.

Function

OPA3 Gene

Introduction

Opa3 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.

--- [@mitochondrial2018]
title: OPA3 [@opa2019]
--- [@methylglutaconic2020]

--- [@mitochondrial2021]
title: OPA3 [@opa2022]
--- [@targeting2023]

<div class="infobox infobox-gene"> [@gene2024]
<table>
<tr><th colspan="2" style="background:#f8f9fa; text-align:center;">OPA3 - OPA3 mitochondrial outer membrane protein</th></tr>
<tr><td><b>Gene Symbol</b></td><td>OPA3</td></tr>
<tr><td><b>Full Name</b></td><td>OPA3 mitochondrial outer membrane protein</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>19q13.32</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[80207](https://www.ncbi.nlm.nih.gov/gene/80207)</td></tr>
<tr><td><b>OMIM</b></td><td>[606580](https://www.omim.org/entry/606580)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000142046](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000142046)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9H3K1](https://www.uniprot.org/uniprot/Q9H3K1)</td></tr>
<tr><td><b>Associated Diseases</b></td><td>Optic atrophy with cataract</td></tr>
</table>
</div>

Overview

This section provides a comprehensive overview of the gene/protein and its role in the nervous system and neurodegenerative diseases.

Function

The OPA3 gene (Optic Atrophy 3) encodes a mitochondrial outer membrane protein that plays critical roles in mitochondrial dynamics, cellular metabolism, and neuronal survival. The OPA3 protein is primarily localized to the mitochondrial outer membrane, where it participates in mitochondrial fusion, cristae maintenance, and regulation of mitochondrial morphology.

Mitochondrial Dynamics

OPA3 is essential for proper mitochondrial fusion:

• Interacts with mitofusins (MFN1, MFN2) to regulate outer membrane fusion
• Helps maintain mitochondrial network integrity
• Supports mitochondrial DNA (mtDNA) maintenance
• Regulates mitochondrial cristae structure

Cellular Functions

Beyond fusion, OPA3 participates in:

• Lipid metabolism: Influences cardiolipin distribution
• [Apoptosis](/entities/apoptosis) regulation: Modulates BAX/BAK-dependent apoptosis
• Iron-sulfur cluster assembly: Connected to Fe-S cluster biogenesis
• Cellular stress response: Activated under mitochondrial stress

Disease Associations

3-Methylglutaconic Aciduria (3-MGA)

OPA3 mutations cause Type I 3-methylglutaconic aciduria, characterized by:

• Elevated 3-methylglutaconic acid in urine
• Optic atrophy
• Cataracts
• Hearing loss
• Developmental delay
• Neurological involvement

Optic Atrophy with Cataract

Autosomal recessive OPA3 mutations lead to:

• Progressive vision loss
• Bilateral optic nerve atrophy
• Early-onset cataracts
• Often presenting in childhood

Susceptibility to Neurodegeneration

OPA3 dysfunction may contribute to:

• Increased susceptibility to Parkinson's disease
• Mitochondrial dysfunction in Alzheimer's disease
• Amyotrophic lateral sclerosis (ALS)
• Age-related neurodegeneration

Expression Pattern

Brain Regions

• Highest expression in: optic nerve, retina, brain [cortex](/brain-regions/cortex)
• Moderate expression: [hippocampus](/brain-regions/hippocampus), cerebellum
• Lower expression in other brain regions

Cell Types

• [Neurons](/entities/neurons) (particularly vulnerable)
• Retinal ganglion cells
• [Astrocytes](/entities/astrocytes)
• [Oligodendrocytes](/cell-types/oligodendrocytes)

Developmental Expression

• Expressed throughout development
• Critical during periods of high metabolic demand
• Maintained in adult tissues

Molecular Interactions

OPA3 interacts with several key proteins:

• MFN1/MFN2: Mitofusins for mitochondrial fusion
• OPA1: Inner membrane fusion regulator
• BAX/BAK: Apoptosis execution
• TOM complex: Mitochondrial protein import

Clinical Significance

Diagnosis

• Genetic testing for OPA3 mutations
• Urine organic acid analysis (3-MGA)
• Ophthalmologic examination
• MRI brain imaging

Treatment Approaches

• No curative treatment available
• Supportive care for symptoms
• Physical therapy
• Genetic counseling
• Research into mitochondrial-targeted therapies

Research Directions

Current research focuses on:

• Understanding OPA3 function in neuronal cells
• Developing mitochondrial-targeted therapeutics
• Gene therapy approaches
• Biomarker development for 3-MGA

See Also

• [Mitochondrial Dynamics Pathway](/mechanisms/mitochondrial-dynamics)
• [Oxidative Phosphorylation](/mechanisms/oxidative-stress-neurodegeneration)
• [Leigh Syndrome](/diseases/leigh-syndrome)
• [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease)
• [Optic Atrophy](/diseases/optic-atrophy)
• [3-Methylglutaconic Aciduria](/diseases/3-methylglutaconic-aciduria)

Background

The study of Opa3 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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References