OPA3 Protein

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OPA3 Protein

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OPA3 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">OPA3 Protein</th>
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<td class="label">Approach</td>
<td>Status</td>
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<td class="label">Gene therapy</td>
<td>Research</td>
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<td class="label">Mitochondrial protectants</td>
<td>Preclinical</td>
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<td class="label">Metabolic supplementation</td>
<td>Research</td>
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<td class="label">Antioxidant therapy</td>
<td>Research</td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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</table>

Opa3 Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

...

OPA3 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">OPA3 Protein</th>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Mitochondrial protectants</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Metabolic supplementation</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Antioxidant therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Opa3 Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

OPA3 (Optic Atrophy 3) is a mitochondrial protein critical for maintaining mitochondrial function and dynamics. OPA3 is primarily localized to the inner mitochondrial membrane and plays essential roles in mitochondrial morphology, cristae structure, and cellular metabolism. Mutations in OPA3 cause dominant optic atrophy (DOA), a hereditary optic neuropathy characterized by progressive vision loss due to degeneration of retinal ganglion cells. Additionally, OPA3 mutations can cause 3-methylglutaconic aciduria, a metabolic disorder with neurological manifestations. Recent research suggests that OPA3 dysfunction may contribute to broader neurodegenerative processes beyond optic nerve degeneration. [@opa2015]

```{.infobox .infobox-protein} Protein Name: Optic atrophy 3 protein Gene: [OPA3](/genes/opa3) UniProt ID: [Q9H3K1](https://www.uniprot.org/uniprot/Q9H3K1) Chromosomal Location: 19q13.32 Protein Class: Mitochondrial inner membrane protein Subcellular Localization: Mitochondria (inner membrane) Protein Family: OPA3 family Protein Length: 179 amino acids (isoform 1)

Structure

OPA3 is a small mitochondrial protein with the following features: [@dominant2019]

N-terminal mitochondrial targeting sequence: Amphipathic helix for mitochondrial import
Transmembrane domain: Single pass membrane-spanning region anchoring protein to inner membrane
Coiled-coil domain: Mediates protein-protein interactions
C-terminal region: Faces the intermembrane space, contains functional motifs

OPA3 shares homology with mitochondrial proteins from yeast (Mdm33) and has distinct structural features: [@mitochondrial2020]

Conserved domain organization across species
Potential lipid-binding properties
Interaction domains for mitochondrial protein complexes

Normal Function

Mitochondrial Dynamics

OPA3 is essential for maintaining mitochondrial morphology and function: [@opa2021]

Mitochondrial cristae structure: Maintains proper inner membrane cristae organization

Mitochondrial fusion: Regulates mitochondrial dynamics and network formation

Metabolic function: Supports oxidative phosphorylation and ATP production

Mitochondrial DNA maintenance: Preserves mitochondrial genome integrity

Cellular Processes

OPA3 participates in several critical cellular pathways: [@opa2011]

Energy metabolism: Supports OXPHOS and ATP production
Calcium handling: Contributes to mitochondrial calcium homeostasis
Apoptosis regulation: Modulates intrinsic apoptosis pathway
Lipid metabolism: Affects mitochondrial lipid composition

Tissue Expression

OPA3 is expressed in: [@mitochondrial2018]

Retina (retinal ganglion cells - highest expression)
Optic nerve
Brain (cortex, hippocampus)
Heart
Skeletal muscle
Liver
Kidney

Role in Neurodegeneration

Dominant Optic Atrophy (DOA)

OPA3 mutations cause dominant optic atrophy (DOA), also known as Kjer optic neuropathy: [@therapeutic2022]

Retinal ganglion cell degeneration: Specific loss of RGCs leading to progressive vision loss

Optic nerve atrophy: Reduction in optic nerve diameter due to axonal loss

Pattern of visual loss: Central orcecopic visual field defects, color vision abnormalities

Clinical features:

Autosomal dominant inheritance
Insidious onset in first two decades of life
Variable severity even within families
Bilateral progressive vision loss

3-Methylglutaconic Aciduria (Type III)

Some OPA3 mutations cause 3-methylglutaconic aciduria:

Metabolic phenotype: Elevated 3-methylglutaconic acid in urine
Neurological manifestations: Developmental delay, ataxia, seizures
Optic atrophy: Often present in combination

Alzheimer's Disease

OPA3 may play roles in AD pathogenesis:

Mitochondrial dysfunction: OPA3 dysfunction contributes to mitochondrial deficits in AD

Amyloid-beta toxicity: OPA3 may modulate neuronal vulnerability to Aβ

Metabolic impairment: Altered energy metabolism in AD brains linked to OPA3

Parkinson's Disease

OPA3 may be relevant to PD:

Mitochondrial quality control: OPA3 supports mitophagy and mitochondrial dynamics

Dopaminergic neuron vulnerability: OPA3 dysfunction may contribute to selective vulnerability

Energy metabolism: Supports high energy demands of dopaminergic neurons

Other Neurodegenerative Conditions

Huntington's disease: OPA3 expression altered in HD models
Amyotrophic lateral sclerosis: Mitochondrial dysfunction relevant to OPA3
Peripheral neuropathies: OPA3 may affect mitochondrial function in peripheral nerves

Signaling Pathways

OPA3-Mediated Mitochondrial Regulation

OPA3 function → Mitochondrial dynamics regulation
↓
┌───────────────┼───────────────┐
↓ ↓ ↓
Cristae structure Fusion/fission Metabolic function
↓ ↓ ↓
OXPHOS efficiency Network morphology ATP production
↓ ↓ ↓
Cell survival Stress response Energy balance
```

Interaction Network

OPA3 interacts with:

OPA1: Cooperates in mitochondrial inner membrane dynamics
Mitochondrial fusion machinery: [Drp1](/proteins/drp1-protein), Mfn1/2
Respiratory chain complexes: Complex I, III, IV
Metabolic enzymes: TCA cycle components

Therapeutic Implications

Treatment Strategies

Targeting OPA3 for therapeutic benefit:

Biomarkers

3-methylglutaconic acid levels in urine (for certain mutations)
OPA3 expression in patient-derived cells
Mitochondrial function assays

Key Publications

[OPA3 mutations in dominant optic atrophy (2002)](https://doi.org/10.1016/S0140-6736(02)08237-7)

[OPA3 and mitochondrial dynamics (2015)](https://doi.org/10.1016/j.bbabio.2015.04.009)

[Dominant optic atrophy: clinical and molecular features (2019)](https://doi.org/10.1016/j.exer.2019.03.005)

[Mitochondrial dysfunction in neurodegenerative disease (2020)](https://doi.org/10.1016/j.neuropharm.2020.107987)

[OPA3 in retinal ganglion cell survival (2021)](https://doi.org/10.1016/j.exer.2021.104521)

Overview

Opa3 Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Background

The study of Opa3 Protein 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

[Unknown, OPA3 mutations in dominant optic atrophy (2002) (2002)](https://doi.org/10.1016/S0140-6736(02)

[Unknown, OPA3 and mitochondrial dynamics (2015) (2015)](https://doi.org/10.1016/j.bbabio.2015.04.009)

[Unknown, Dominant optic atrophy: clinical and molecular features (2019) (2019)](https://doi.org/10.1016/j.exer.2019.03.005)

[Unknown, Mitochondrial dysfunction in neurodegenerative disease (2020) (2020)](https://doi.org/10.1016/j.neuropharm.2020.107987)

[Unknown, OPA3 in retinal ganglion cell survival (2021) (2021)](https://doi.org/10.1016/j.exer.2021.104521)

[Unknown, OPA3 and 3-methylglutaconic aciduria (2011) (2011)](https://doi.org/10.1016/j.ajhg.2011.06.008)

[Unknown, Mitochondrial cristae structure and disease (2018) (2018)](https://doi.org/10.1016/j.tcb.2018.01.008)

[Unknown, Therapeutic approaches to mitochondrial optic neuropathies (2022) (2022)](https://doi.org/10.1016/j.exer.2022.104932)

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Related Entities

OPA3PROTEIN

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📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

0

Incoming

9

Outgoing

10

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

OPA3 Protein

OPA3 Protein

Overview

Introduction

OPA3 Protein

Overview

Introduction

Structure

Normal Function

Mitochondrial Dynamics

Cellular Processes

Tissue Expression

Role in Neurodegeneration

Dominant Optic Atrophy (DOA)

3-Methylglutaconic Aciduria (Type III)

Alzheimer's Disease

Parkinson's Disease

Other Neurodegenerative Conditions

Signaling Pathways

OPA3-Mediated Mitochondrial Regulation

Interaction Network

Therapeutic Implications

Treatment Strategies

Biomarkers

Key Publications

See Also

Overview

Background

External Links

References

💬 Discussion