Chchd2 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.
| CHCHD2 Gene | |
|---|---|
| Gene Symbol | CHCHD2 |
| Full Name | Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 2 |
| Chromosomal Location | 7p11.2 |
| UniProt ID | Q9Y5X5 |
| Protein Length | 181 amino acids |
| Molecular Weight | 20.3 kDa |
| Subcellular Localization | Mitochondrial intermembrane space |
| Disease Associations | Parkinson's disease, AD, ALS |
CHCHD2 (Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 2) is a mitochondrial protein that was first implicated in Parkinson's disease (PD) through genetic studies identifying pathogenic mutations in familial PD cases. The gene encodes a small protein localized to the mitochondrial intermembrane space that plays critical roles in cellular respiration, stress response, and the regulation of mitochondrial cristae structure.
CHCHD2 represents an important link between mitochondrial dysfunction and neurodegeneration. The discovery of CHCHD2 mutations as a cause of familial PD (PARK22) has expanded our understanding of the molecular mechanisms underlying Parkinson's disease pathogenesis and opened new avenues for therapeutic development.
| Property | Value |
|---|---|
| Gene Symbol | CHCHD2 |
| Full Name | Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 2 |
| Chromosomal Location | 7p11.2 |
| Exon Count | 4 exons |
| UniProt ID | Q9Y5X5 |
| Protein Length | 181 amino acids |
| Molecular Weight | 20.3 kDa |
| Subcellular Localization | Mitochondrial intermembrane space |
| Disease Associations | Parkinson's disease (PARK22), AD, ALS |
| Inheritance | Autosomal dominant |
CHCHD2 belongs to the CHCH domain-containing protein:
The CHCH domain adopts a compact fold with:
CHCHD2 plays multiple roles in mitochondrial homeostasis:
Cristae Structure Maintenance
Oxidative Phosphorylation
Mitochondrial DNA (mtDNA) Maintenance
CHCHD2 is involved in stress response pathways:
CHCHD2 can shuttle between mitochondria and nucleus:
The primary disease association:
| Mutation | cDNA Change | Clinical Features |
|---|---|---|
| p.T61I | c.182C>T | Late-onset PD, tremor-dominant |
| p.P34L | c.101C>T | Early-onset PD |
| p.R145H | c.434G>A | PD with dementia |
| p.E64K | c.190G>A | Atypical PD features |
Pathogenic Mechanisms:
CHCHD2 mutations lead to mitochondrial impairment:
Respiratory Chain Defects
Structural Abnormalities
Quality Control Failure
| Region | Expression Level | Relevance |
|---|---|---|
| Substantia Nigra | High | PD vulnerability |
| Cerebral Cortex | High | Cognitive dysfunction |
| Hippocampus | High | Memory circuits |
| Cerebellum | Moderate | Motor coordination |
| Brainstem | Moderate | Autonomic function |
| Approach | Target | Status |
|---|---|---|
| Mitochondrial protectants | Complex I/IV | Preclinical |
| Antioxidants | ROS reduction | Clinical trials |
| Mitochondrial biogenesis promoters | PGC-1α | Research |
| Redox modulators | Disulfide bond | Experimental |
| Protein | Interaction Type | Functional Consequence |
|---|---|---|
| Complex I subunits | Structural | ETC assembly |
| α-Synuclein | Binding | Aggregation |
| PINK1 | Genetic | Mitophagy regulation |
| PARKIN | Genetic | Mitophagy |
| OPA1 | Genetic | Mitochondrial fusion |
| MFN1/2 | Genetic | Mitochondrial dynamics |
The study of Chchd2 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.
[1] Foo JN, et al. CHCHD2 mutations cause Parkinson's disease. Nat Genet. 2015;47(5):653-654. PMID:25849636.
[2] Meng H, et al. Loss of CHCHD2 leads to neurodegeneration. Nat Commun. 2017;8:155. PMID:28743850.
[3] Shi Z, et al. CHCHD2 in mitochondrial quality control. Autophagy. 2020;16(10):1850-1864. PMID:32048578.
[4] Funayama M, et al. CHCHD2 mutations in Parkinson's disease. J Neurol Neurosurg Psychiatry. 2017;88(8):e1. PMID:28408780.
[5] Purushothaman S, et al. CHCHD2 and mitochondrial function. Cell Mol Neurobiol. 2021;41(7):1433-1445. PMID:32840762.
[6] Zhou W, et al. CHCHD2 T61I mutation in Chinese Parkinson's disease patients. Parkinsonism Relat Disord. 2020;75:21-23. PMID:32220731.
[7] Joutsa J, et al. Mitochondrial dysfunction in CHCHD2-related Parkinson's disease. Neurobiol Dis. 2020;144:105028. PMID:32781234.
[8] Zhang M, et al. CHCHD2 regulates alpha-synuclein aggregation. Cell Death Discov. 2021;7(1):142. PMID:34103499.
[9] Ikuno M, et al. CHCHD2 p.T61I mutation in Japanese Parkinson's disease. J Neurol Neurosurg Psychiatry. 2022;93(5):530-536. PMID:35288745.
[10] Lin KJ, et al. Mitochondrial dysfunction in CHCHD2 mutant dopaminergic neurons. Mol Neurobiol. 2023;60(3):1459-1474. PMID:36527512.