COQ5 Gene

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COQ5 Gene

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COQ5 Gene

Introduction

Coq5 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.

Overview

COQ5 Gene (Coenzyme Q Biosynthesis Factor 5) provides instructions for making the COQ5 protein, a mitochondrial methyltransferase essential for coenzyme Q (CoQ10) biosynthesis. The COQ5 protein catalyzes the C5-methylation step in the CoQ biosynthetic pathway, converting demethoxy-ubiquinone (DMQ) to intermediate forms that are subsequently processed to produce ubiquinone (CoQ10). [@stefely2016]

Gene Information

<div class="infobox infobox-gene"> [@desbats2015]
<table> [@hargreaves2014]
<tr><th>Gene Symbol</th><td>COQ5</td></tr>
<tr><th>Full Name</th><td>Coenzyme Q Biosynthesis Factor 5</td></tr>
<tr><th>Chromosomal Location</th><td>12q24.31</td></tr>
<tr><th>NCBI Gene ID</th><td>84223</td></tr>
<tr><th>OMIM</th><td>616787</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000108465</td></tr>
<tr><th>UniProt ID</th><td>Q9NXK5</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Gene Structure

The COQ5 gene contains:

Exons: 6 coding exons
Transcript length: ~1.2 kb coding sequence
Protein length: 333 amino acids
Molecular weight: ~38 kDa

Normal Function

CoQ10 Biosynthesis

COQ5 encodes a S-adenosylmethionine (SAM)-dependent methyltransferase that catalyzes:

...

COQ5 Gene

Introduction

Coq5 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.

Overview

COQ5 Gene (Coenzyme Q Biosynthesis Factor 5) provides instructions for making the COQ5 protein, a mitochondrial methyltransferase essential for coenzyme Q (CoQ10) biosynthesis. The COQ5 protein catalyzes the C5-methylation step in the CoQ biosynthetic pathway, converting demethoxy-ubiquinone (DMQ) to intermediate forms that are subsequently processed to produce ubiquinone (CoQ10). [@stefely2016]

Gene Information

<div class="infobox infobox-gene"> [@desbats2015]
<table> [@hargreaves2014]
<tr><th>Gene Symbol</th><td>COQ5</td></tr>
<tr><th>Full Name</th><td>Coenzyme Q Biosynthesis Factor 5</td></tr>
<tr><th>Chromosomal Location</th><td>12q24.31</td></tr>
<tr><th>NCBI Gene ID</th><td>84223</td></tr>
<tr><th>OMIM</th><td>616787</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000108465</td></tr>
<tr><th>UniProt ID</th><td>Q9NXK5</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Gene Structure

The COQ5 gene contains:

Exons: 6 coding exons
Transcript length: ~1.2 kb coding sequence
Protein length: 333 amino acids
Molecular weight: ~38 kDa

Normal Function

CoQ10 Biosynthesis

COQ5 encodes a S-adenosylmethionine (SAM)-dependent methyltransferase that catalyzes:

C5-methylation of demethoxy-ubiquinone (DMQ)

Preparation of the intermediate for subsequent hydroxylation

Essential step in CoQ10 ring modification

Mitochondrial Function

The COQ5 protein supports mitochondrial function by:

Enabling CoQ10 synthesis - Essential electron carrier

Supporting oxidative phosphorylation - ATP production

Maintaining electron transport - Complex I and II function

Antioxidant protection - CoQ10's role in [ROS](/entities/reactive-oxygen-species) scavenging

Expression Pattern

COQ5 is expressed in various tissues:

Brain - [Neurons](/entities/neurons) throughout the cerebral cortex, hippocampus, cerebellum
Heart - High expression in cardiac muscle
Liver - Metabolic activity
Kidney - Renal tissue
Muscle - Skeletal muscle

Brain Region Distribution

Cerebral [Cortex](/brain-regions/cortex) - Pyramidal neurons
[Hippocampus](/brain-regions/hippocampus) - CA1-CA3 neurons, dentate gyrus
Cerebellum - Purkinje cells
Basal Ganglia - Striatal neurons
Substantia Nigra - Dopaminergic neurons

Disease Associations

Primary CoQ10 Deficiency

COQ5 mutations cause primary CoQ10 deficiency:

Encephalomyopathy - Severe neurological impairment
Ataxia - Cerebellar ataxia with coordination difficulties
Myopathy - Muscle weakness, exercise intolerance
Sensorineural hearing loss - Progressive deafness
Nephropathy - Kidney disease in some cases

Neurodegenerative Disease Connections

Parkinson's Disease

Mitochondrial Complex I deficiency in PD substantia nigra
CoQ10 levels reduced in PD brains
Genetic variants may modify PD risk
CoQ10 supplementation trials in PD

Alzheimer's Disease

Mitochondrial dysfunction in AD
CoQ10 levels decline with age and AD
Oxidative stress increased
Therapeutic potential of CoQ10

Amyotrophic Lateral Sclerosis

Energy metabolism deficits in ALS
Mitochondrial dysfunction
CoQ10 tested in clinical trials

Multiple System Atrophy

CoQ10 deficiency in some patients
Mitochondrial defects
Potential therapeutic target

Therapeutic Targeting

Current Approaches

| Treatment | Mechanism | Status |
|-----------|-----------|--------|
| Ubiquinol (CoQ10) | Electron carrier, antioxidant | Supplements available |
| Idebenone | Synthetic CoQ10 analog | Approved for Friedreich's ataxia |
| MitoQ | Mitochondria-targeted CoQ10 | Research |
| CoQ10 nanoemulsions | Improved bioavailability | Clinical trials |

Future Directions

Gene therapy to restore COQ5 function
Small molecule CoQ pathway activators
Mitochondria-targeted antioxidants
Combination mitochondrial therapies

Animal Models

Coq5 knockout mice - Embryonic lethal
Yeast coq5 mutants - Require CoQ supplementation
Zebrafish models - Show developmental defects
C. elegans coq5 - Shortened lifespan

External Links

[NCBI Gene: COQ5](https://www.ncbi.nlm.nih.gov/gene/84223)
[UniProt: Q9NXK5](https://www.uniprot.org/uniprot/Q9NXK5)
[GeneCards: COQ5](https://www.genecards.org/cgi-bin/carddisp.pl?gene=COQ5)
[OMIM: 616787](https://omim.org/entry/616787)

Background

The study of Coq5 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.

References

[Wang Y, et al, (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26225998/)

[Stefely JA, et al, (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27605618/)

[Desbats MA, et al, (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25999232/)

[Unknown, Hargreaves IP (2014). Coenzyme Q10 as a therapy for mitochondrial disease (2014)](https://pubmed.ncbi.nlm.nih.gov/24815075/)

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Related Entities

COQ5

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slug	genes-coq5
kg_node_id	COQ5
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-5020b3229076
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-coq5'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

6

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

COQ5 Gene

COQ5 Gene

Introduction

Overview

Gene Information

Gene Structure

Normal Function

CoQ10 Biosynthesis

COQ5 Gene

Introduction

Overview

Gene Information

Gene Structure

Normal Function

CoQ10 Biosynthesis

Mitochondrial Function

Expression Pattern

Brain Region Distribution

Disease Associations

Primary CoQ10 Deficiency

Neurodegenerative Disease Connections

Parkinson's Disease

Alzheimer's Disease

Amyotrophic Lateral Sclerosis

Multiple System Atrophy

Therapeutic Targeting

Current Approaches

Future Directions

Animal Models

See Also

External Links

Background

References

💬 Discussion