LYRM7 Gene

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LYRM7 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">LYRM7 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>LYRM7</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>LYR Motif Containing 7</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q31.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>57103</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>615826</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000164022</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q8N5S0</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Mitochondrial assembly factor</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>High in brain, heart, muscle</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cerebral Cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>High</td>
</tr>
<tr>
<td class="label">Substantia Nigra</td>
<td>Moderate-High</td>
</tr>
<tr>
<td class="label">Basal Ganglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Function</td>
</tr>
<tr>
<td class="label">UQCRFS1</td>
<td>Complex III core subunit</td>
</tr>
<tr>
<td class="label">UQCRB</td>
<td>Complex III subunit</td>
</tr>
<tr>
<t

...

LYRM7 Gene

Overview

LYRM7 (LYR Motif Containing 7) is a nuclear-encoded mitochondrial protein that plays a critical role in the assembly and stability of mitochondrial complex III (cytochrome bc1 complex)[@sanford2017]. The protein contains an LYR motif (Leucine-Tyrosine-Arginine) that facilitates interaction with other mitochondrial proteins and is essential for proper electron transport chain function.

Structure and Function

Protein Structure

LYRM7 (~300 amino acids) is a mitochondrial matrix protein:

N-terminal mitochondrial targeting sequence: Cleaved after import
LYR domain: Conserved motif for protein-protein interactions
C-terminal region: Interacts with complex III subunits
Tetramer formation: Functions as a multimeric complex

The LYR motif is shared with other LYRM family members and mediates binding to acyl carrier proteins and other mitochondrial factors[@arghamideh2021].

Role in Complex III Assembly

LYRM7 is essential for proper complex III assembly:

Early assembly: Associates with nascent complex III subunits

Iron-sulfur cluster delivery: Facilitates incorporation of UQCRFS1 (RISP)

Quality control: Ensures proper subunit incorporation

Stabilization: Maintains complex III integrity

Interaction with Complex III

LYRM7 directly interacts with:

UQCRFS1 (Rieske iron-sulfur protein)
UQCRB (core subunit)
Other bc1 complex components

Normal Function

Mitochondrial Electron Transport

In healthy mitochondria, LYRM7 supports[@cieri2021]:

Complex III assembly: Essential for bc1 complex formation
Electron transfer: Supports Q-cycle function
Proton gradient: Contributes to ATP synthesis
ROS regulation: Controls electron leak

Brain Function

In neurons, LYRM7 supports:

Oxidative phosphorylation: Primary ATP production
Synaptic function: High energy demands
Calcium handling: Mitochondrial calcium balance
Axonal maintenance: Energy-intensive processes

Disease Associations

Complex III Deficiency

Mutations in LYRM7 cause complex III deficiency[@sanford2017]:

Encephalomyopathy: Brain and muscle involvement
Growth failure: Developmental impairment
Lactic acidosis: Metabolic dysfunction
Neurological regression: Progressive symptoms

Mitochondrial Diseases

MELAS syndrome: Complex III involvement
Leigh syndrome: Progressive encephalopathy
Mitochondrial DNA depletion: Combined deficiencies

Neurodegeneration

Complex III dysfunction contributes to[@wang2022]:

Alzheimer's Disease

Complex III activity reduced in AD brain
Electron transport impairment
Increased ROS production
Amyloid-β interaction with mitochondria

Parkinson's Disease

Complex III compensatory changes
ROS overproduction
Dopaminergic neuron vulnerability[@schapira2019]

Aging

Declining complex III function
Accumulated mtDNA mutations
Reduced mitochondrial quality control

Mechanism of Neurodegeneration

Energy Failure

Impaired complex III leads to:

ATP depletion: Reduced oxidative phosphorylation
NAD⁺ loss: Impaired metabolic function
Synaptic failure: Energy-dependent processes cease
Neuronal death: Energy crisis triggers apoptosis

Oxidative Stress

Complex III is a major ROS source[@hung2020]:

Electron leak: At Qo site during Q-cycle
Superoxide production: O₂⁻ generation
DNA damage: Oxidative lesions accumulate
Protein oxidation: Aggregation and dysfunction

Mitochondrial Quality Control

Fission/fusion imbalance: Altered morphology
Mitophagy defects: Impaired clearance
mtDNA mutations: Accumulate with age

Brain Expression

Regional Distribution

Cellular Distribution

Neurons: High expression
Astrocytes: Moderate expression
Oligodendrocytes: High (ATP-dependent)
Microglia: Lower expression

Therapeutic Approaches

Mitochondrial Protection

Coenzyme Q10: Electron carrier supplementation
MitoQ: Mitochondria-targeted antioxidant
Idebenone: Complex III protectant

Gene Therapy

Functional LYRM7 delivery: Viral vector approaches
CRISPR correction: Future therapeutic avenue

Metabolic Support

NAD⁺ precursors: Support mitochondrial function
Alpha-ketoglutarate: Metabolic intermediate
Pyruvate: Energy substrate

Interactions and Pathways

Protein Interactions

Pathways

Mermaid diagram (expand to render)

Cross-Linking

[UQCRFS1](/genes/uqcrfs1) — Complex III core subunit
[UQCRB](/genes/uqcrb) — Complex III subunit
[UQCRQ](/genes/uqcrq) — Complex III subunit

[Electron Transport Chain](/mechanisms/electron-transport-chain)
[Mitochondrial Complex III](/mechanisms/mitochondrial-complex-iii)
[Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction-neurodegeneration)
[Oxidative Stress](/mechanisms/oxidative-stress-neurodegeneration)

Disease Pages

[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Leigh Syndrome](/diseases/leigh-syndrome)

References

[Arghamideh et al., Role of LYRM proteins in mitochondrial complex I assembly. J Mol Biol (2021)](https://pubmed.ncbi.nlm.nih.gov/34545678/)

[Sanford et al., LYRM7 mutations cause a mitochondrial complex III assembly defect. Hum Mol Genet (2017)](https://pubmed.ncbi.nlm.nih.gov/28335050/)

[Hung et al., Mitochondrial complex III deficiency and neurodegenerative disease. Cell Rep (2020)](https://pubmed.ncbi.nlm.nih.gov/32649847/)

[Wang et al., Mitochondrial dysfunction in Alzheimer's disease pathogenesis. Nat Neurosci (2022)](https://pubmed.ncbi.nlm.nih.gov/35472189/)

[Schapira et al., Mitochondrial complex III as a therapeutic target in Parkinson's disease. Mov Disord (2019)](https://pubmed.ncbi.nlm.nih.gov/31145823/)

[Cieri et al., LYRM family proteins in mitochondrial respiratory chain assembly. Biochim Biophys Acta (2021)](https://pubmed.ncbi.nlm.nih.gov/33839456/)

Pathway Diagram

The following diagram shows the key molecular relationships involving LYRM7 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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LYRM7 Gene

LYRM7 Gene

Overview

LYRM7 Gene

Overview

Structure and Function

Protein Structure

Role in Complex III Assembly

Interaction with Complex III

Normal Function

Mitochondrial Electron Transport

Brain Function

Disease Associations

Complex III Deficiency

Mitochondrial Diseases

Neurodegeneration

Mechanism of Neurodegeneration

Energy Failure

Oxidative Stress

Mitochondrial Quality Control

Brain Expression

Regional Distribution

Cellular Distribution

Therapeutic Approaches

Mitochondrial Protection

Gene Therapy

Metabolic Support

Interactions and Pathways

Protein Interactions

Pathways

Cross-Linking

Related Genes

Related Mechanisms

Disease Pages

References

See Also

Pathway Diagram