chchd2-protein

📖 Wiki Page

protein1018 wordssynced 2026-04-02

CHCHD2 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">chchd2-protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>CHCHD2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>chchd2-protein</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=CHCHD2" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <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/dementia" style="color:#ef9a9a">Dementia</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">58 edges</a></td>
</tr>
</table>

Overview

...

CHCHD2 Protein

Overview

CHCHD2 (Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 2) is a small mitochondrial protein (~182 amino acids) that plays critical roles in mitochondrial structure, function, and dynamics. It is highly expressed in brain tissue, particularly in [dopaminergic neurons](/entities/dopaminergic-neurons) of the substantia nigra, making it particularly relevant to [Parkinson's disease](/diseases/parkinsons-disease) pathogenesis[-@t61i]. CHCHD2 is a member of the twin CX9C protein family, characterized by conserved motifs that coordinate zinc ions and mediate protein-protein interactions within mitochondria.

Structure

CHCHD2 possesses several distinctive structural features essential for its mitochondrial function:

Twin CX9C motif: Two Cys-X9-Cys sequences that form zinc-binding domains, enabling dimerization and interaction with other mitochondrial proteins
Coiled-coil Helix domains: Alpha-helical regions facilitating protein-protein interactions within the inner mitochondrial membrane
N-terminal mitochondrial targeting sequence (MTS): Directs the protein to mitochondrial matrix via TOM/TIM translocase machinery
C-terminal coiled-coil domain: Mediates homodimerization and heterodimerization with CHCHD10

The protein localizes primarily to the mitochondrial cristae and inner membrane, where it participates in maintaining cristae curvature and organization[--@chchd10_2018].

Normal Function

CHCHD2 performs several essential mitochondrial functions critical for neuronal survival:

Mitochondrial Cristae Organization

CHCHD2 maintains the structural integrity of mitochondrial cristae, which are the primary sites of oxidative phosphorylation. By interacting with OPA1 and other cristae-organizing proteins, CHCHD2 ensures proper cristae curvature and maximizes the surface area for ATP production.

Mitochondrial DNA Maintenance

CHCHD2 associates with mitochondrial nucleoids and participates in mtDNA replication and maintenance. It interacts with polymerase gamma (POLG) and TFAM to support mitochondrial genome stability.

Regulation of Mitochondrial Dynamics

CHCHD2 regulates both mitochondrial fusion and fission processes:

Fusion: Interacts with mitofusins (MFN1/2) and OPA1 to facilitate mitochondrial network integration
Fission: Coordinates with DRP1 (Dynamin-related protein 1) for proper mitochondrial division

Oxidative Phosphorylation

CHCHD2 supports complex I and complex IV assembly, ensuring efficient electron transport chain function and ATP production through oxidative phosphorylation.

Integrated Stress Response

CHCHD2 participates in the mitochondrial integrated stress response (ISRmt), coordinating mitochondrial function with nuclear gene expression[--@stress2022].

Role in Neurodegeneration

Parkinson's Disease

CHCHD2 is strongly implicated in PD pathogenesis through multiple mechanisms:

T61I Mutation

The p.Thr61Ile (T61I) missense mutation in CHCHD2 is linked to autosomal dominant [Parkinson's disease](/diseases/parkinsons-disease). This mutation causes:

Mitochondrial precipitation of mutant CHCHD2 protein
Co-precipitation of wild-type CHCHD2 (a toxic gain-of-function)
Impaired mitochondrial respiration
Enhanced lipid peroxidation
Reduced complex I activity in dopaminergic neurons[-@t61i]

Mouse models carrying the CHCHD2 T61I knock-in mutation exhibit:

Motor defects (rotarod, pole test deficits)
Neuropathological features of PD including:
Loss of dopaminergic neurons in substantia nigra pars compacta
Alpha-synuclein aggregation
Mitochondrial dysfunction[-@mice2023]

Ferroptosis Pathway

Recent research reveals CHCHD2's neuroprotective role through the GPX4-dependent ferroptosis pathway:

CHCHD2 upregulation protects against ferroptosis (iron-dependent lipid peroxidation)
CHCHD2 deficiency enhances susceptibility to ferroptotic cell death
GPX4 (Glutathione peroxidase 4) and CHCHD2 cooperate in neuronal survival
This pathway provides a potential therapeutic target for PD[--@gp2025]

Alpha-Ketoglutarate Dehydrogenase

CHCHD2 deficiency leads to dysregulation of mitochondrial alpha-ketoglutarate dehydrogenase (α-KGDH):

Elevated lipid peroxidation in models
Impaired mitochondrial metabolism
Enhanced oxidative stress in dopaminergic neurons[-@kg2025]

NFE2L2 Pathway

CHCHD2 downregulation reduces expression of:

NFE2L2 (Nrf2): Master regulator of antioxidant response
RQCD1 (CEMIP): Cell migration-inducing protein

These changes contribute to PD pathogenesis by weakening cellular antioxidant defenses[--@nfe2l2_2022].

Amyotrophic Lateral Sclerosis (ALS)

CHCHD2 mutations are also implicated in ALS and frontotemporal dementia (FTD):

Mitochondrial dysfunction in motor neurons
Impaired axonal mitochondrial transport
Interaction with SOD1 and FUS mutations[-@twin2019]

Alzheimer's Disease

While less directly implicated, CHCHD2 may play a role in [Alzheimer's disease](/diseases/alzheimers-disease) through:

Mitochondrial dysfunction (a core AD feature)
Altered mitochondrial dynamics in neurons
Potential interaction with amyloid-beta metabolism

Therapeutic Targeting

Several therapeutic strategies targeting CHCHD2-related pathways are under investigation:

Small Molecule Activators

Mitochondrial biogenesis activators: PGC-1α agonists to enhance mitochondrial function
Antioxidants: CoQ10, idebenone for oxidative stress reduction
Ferroptosis inhibitors: Liproxstatin-1, ferrostatin-1

Gene Therapy Approaches

Viral vector delivery of wild-type CHCHD2
siRNA targeting mutant CHCHD2 alleles

Drug Repurposing

Statins (for NFE2L2 activation)
Metformin (for mitochondrial function)

Biomarkers

CHCHD2 expression levels in peripheral blood or cerebrospinal fluid may serve as:

Diagnostic biomarkers for PD
Prognostic indicators
Treatment response markers

References

[@Y Liu et al., CHCHD2 harboring Parkinson's disease-linked T61I mutation precipitates inside mitochondria, Brain 2020 (2020)](https://pubmed.ncbi.nlm.nih.gov/32068847/)

[@G Peng et al., Neuroprotective role of CHCHD2 in Parkinson's disease: Insights into the GPX4-related ferroptosis pathway, Cell Discov 2025 (2025)](https://pubmed.ncbi.nlm.nih.gov/39566750/)

[@K Lee et al., Dysregulation of mitochondrial alpha-ketoglutarate dehydrogenase leads to elevated lipid peroxidation in CHCHD2-linked Parkinson's disease models, Acta Neuropathol 2025 (2025)](https://pubmed.ncbi.nlm.nih.gov/40011434/)

[@A Liu et al., CHCHD2 accumulates in distressed mitochondria and facilitates oligomerization of CHCHD10, Nat Commun 2018 (2018)](https://pubmed.ncbi.nlm.nih.gov/30084972/)

[@M Liu et al., CHCHD2 and CHCHD10 regulate mitochondrial dynamics and integrated stress response, Cell Rep 2022 (2022)](https://pubmed.ncbi.nlm.nih.gov/35173147/)

[@K Liu et al., CHCHD2 p.Thr61Ile knock-in mice exhibit motor defects and neuropathological features of Parkinson's disease, Acta Neuropathol Commun 2023 (2023)](https://pubmed.ncbi.nlm.nih.gov/36322611/)

[@J Kim et al., Downregulation of CHCHD2 may contributes to Parkinson's Disease by Reducing Expression of NFE2L2 and RQCD1, Cell Mol Neurobiol 2022 (2022)](https://pubmed.ncbi.nlm.nih.gov/35388756/)

[@H Liu et al., Twin CHCH Proteins, CHCHD2, and CHCHD10: Key Molecules of Parkinson's Disease, Amyotrophic Lateral Sclerosis, and Frontotemporal Dementia, Neuroscientist 2019 (2019)](https://pubmed.ncbi.nlm.nih.gov/30791515/)

[@S Wang et al., Mitochondrial Dysfunction and Mitophagy in Parkinson's Disease: From Mechanism to Therapy, Front Cell Dev Biol 2021 (2021)](https://pubmed.ncbi.nlm.nih.gov/33323315/)

[@C Liu et al., Mitochondrial CHCHD2 and CHCHD10: Roles in Neurological Diseases and Therapeutic Implications, Curr Neurovasc Res 2020 (2020)](https://pubmed.ncbi.nlm.nih.gov/31526091/)

📖 View canonical wiki page →

chchd2-protein

CHCHD2 Protein

Overview

CHCHD2 Protein

Overview

Structure

Normal Function

Mitochondrial Cristae Organization

Mitochondrial DNA Maintenance

Regulation of Mitochondrial Dynamics

Oxidative Phosphorylation

Integrated Stress Response

Role in Neurodegeneration

Parkinson's Disease

T61I Mutation

Ferroptosis Pathway

Alpha-Ketoglutarate Dehydrogenase

NFE2L2 Pathway

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Therapeutic Targeting

Small Molecule Activators

Gene Therapy Approaches

Drug Repurposing

Biomarkers

See Also

References