CHCHD10 Protein

CHCHD10 Protein

Overview

CHCHD10 Protein

Overview

CHCHD10 (Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 10) is a mitochondrial protein encoded by the CHCHD10 gene, initially identified as a stability factor for mitochondrial DNA (mtDNA) and later implicated in amyotrophic lateral sclerosis (ALS), frontotemporal dementia (FTD), and Parkinson's disease. First described in 2010, CHCHD10 has emerged as a critical regulator of mitochondrial cristae structure, respiratory chain function, and neuronal survival [@wenzel2010].

The discovery of disease-causing mutations in CHCHD10 in 2015 linked it to a spectrum of neurodegenerative disorders, highlighting the importance of mitochondrial integrity in neuronal health. CHCHD10 localizes to the mitochondrial intermembrane space, where it interacts with other mitochondrial proteins to maintain cristae architecture and mtDNA nucleoid organization.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2"><strong>CHCHD10</strong></th></tr>
<tr><td><strong>Full Name</strong></td><td>Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 10</td></tr>
<tr><td><strong>Gene</strong></td><td>CHCHD10</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q8N4L2](https://www.uniprot.org/uniprot/Q8N4L2)</td></tr>
<tr><td><strong>Protein Size</strong></td><td>146 amino acids</td></tr>
<tr><td><strong>Protein Family</strong></td><td>CHCH domain-containing protein family</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>22q11.23</td></tr>
<tr><td><strong>Subcellular Location</strong></td><td>Mitochondrial intermembrane space</td></tr>
<tr><td><strong>Associated Disease</strong></td><td>ALS, FTD, PD, SMA with myoclonic epilepsy</td>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">22 edges</a></td>
</tr>
</table>
</div>

Structure

Domain Architecture

CHCHD10 contains characteristic structural features:

• N-terminal mitochondrial targeting sequence: A cleavable presequence that directs import into mitochondria
• CHCH domains: Two coiled-coil-helix-coiled-coil-helix domains separated by a linker region
• Each CHCH domain contains two CXXC motifs that coordinate zinc ions
• These motifs are essential for protein stability and function
• C-terminal region: Involved in protein-protein interactions

Structural Highlights

• Zinc finger motifs: The twin CXXC motifs form zinc-binding fingers that stabilize the protein structure
• Dimerization: CHCHD10 can form homodimers through its coiled-coil regions
• Import mechanism: Translocated through the TOM/TIM complex into the mitochondrial intermembrane space

Normal Function

Mitochondrial DNA Maintenance

CHCHD10 plays a critical role in mtDNA stability:

• mtDNA nucleoid organization: CHCHD10 localizes to mtDNA nucleoids and maintains their structural integrity
• Replication regulation: Interacts with mitochondrial replication machinery
• mtDNA copy number: Loss of CHCHD10 leads to decreased mtDNA copy number [@martinho2015]

Mitochondrial Structure

CHCHD10 is essential for mitochondrial cristae organization:

• Cristae junctions: Maintains proper cristae architecture and contact sites
• OXPHOS complex assembly: Facilitates assembly of respiratory chain complexes [@wang2022]
• Membrane curvature: Contributes to cristae membrane curvature and folding

Cellular Functions

• Respiratory chain function: CHCHD10 deficiency impairs complex I and IV activity
• Calcium homeostasis: Regulates mitochondrial calcium uptake and release [@liu2022]
• ATP production: Loss of function reduces cellular ATP levels
• Synaptic function: Critical for synaptic mitochondrial function and neuronal activity [@morris2023]

Role in ALS and FTD

Disease-Causing Mutations

Multiple pathogenic variants have been identified in CHCHD10:

| Mutation | Effect | Disease | Reference |
|----------|--------|--------|-----------|
| p.Gly170Val | Missense, toxic | ALS/FTD | [@bannerman2015] |
| p.Arg102Leu | Missense, loss of function | SMA/ALS | [@zhang2015] |
| p.Ser149Leu | Missense, toxic | ALS/FTD | [@yang2021] |
| p.Arg15His | Missense, toxic | FTD | [@bannerman2015] |

Pathogenic Mechanisms

CHCHD10 mutations cause disease through multiple mechanisms:

Therapeutic Implications

• Gene therapy: CRISPR-based approaches to correct mutations [@zhou2024]
• Mitochondrial protectants: Compounds that enhance mitochondrial function
• Antioxidants: Reductive stress mitigation

Role in Parkinson's Disease

Genetic Association

CHCHD10 has been implicated in PD pathogenesis:

• Risk variants: Certain CHCHD10 polymorphisms associated with PD risk [@yang2023]
• Expression studies: Altered CHCHD10 expression in PD patient brains
• PINK1 interaction: CHCHD10 interacts with PINK1/parkin pathway in mitophagy [@chen2021]

Mechanisms in PD

• Mitochondrial dysfunction: Contributes to dopaminergic neuron vulnerability
• Oxidative stress: CHCHD10 deficiency increases ROS production
• Autophagy impairment: Disrupted mitophagy in CHCHD10-deficient neurons

Mitochondrial Dynamics

Interactions

CHCHD10 interacts with several key mitochondrial proteins:

• OPA1: Cristae maintenance and inner membrane fusion
• PINK1: Mitophagy regulation
• TFAM: mtDNA maintenance
• Mitochondrial translation machinery: Protein synthesis in mitochondria

Quality Control

• Mitophagy: CHCHD10 is cleared through the PINK1-Parkin pathway
• Proteostasis: Mitochondrial protein quality control systems
• Biogenesis: Mitochondrial new protein synthesis and assembly

Research Directions

Knowledge Gaps

• Structure-function relationships: How specific mutations affect protein function
• Cell-type specificity: Why motor neurons and dopaminergic neurons are particularly vulnerable
• Therapeutic targets: Optimal points for intervention in the pathogenic cascade

Ongoing Studies

• iPSC models: Patient-derived neurons for drug screening
• Animal models: Transgenic mice with CHCHD10 mutations
• Compound screening: Identification of small molecules that restore CHCHD10 function

Cross-links

• [Mitochondrial DNA Maintenance](/mechanisms/mitochondrial-dna-maintenance)
• [ALS Disease](/diseases/amyotrophic-lateral-sclerosis)
• [Frontotemporal Dementia](/diseases/behavioral-variant-ftd)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction-pathway)
• [Cristae Organization](/mechanisms/mitochondrial-cristae-organization)

See Also

• [Mitochondrial Proteins](/proteins/mitochondrial-proteins)
• [ALS Genetics](/diseases/amyotrophic-lateral-sclerosis)
• [OXPHOS Complexes](/mechanisms/oxidative-phosphorylation)
• [Mitophagy Pathway](/mechanisms/mitophagy-pathway)

External Links

• [UniProt: Q8N4L2](https://www.uniprot.org/uniprot/Q8N4L2)
• [Gene: CHCHD10](https://www.ncbi.nlm.nih.gov/gene/400941)
• [OMIM: 615048](https://www.omim.org/entry/615048)
• [ALSOD: CHCHD10](https://alsod.ac.uk/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving CHCHD10 Protein discovered through SciDEX knowledge graph analysis: