CEP57 (Centrosomal Protein 57) is a crucial centrosomal protein involved in microtubule organization and spindle assembly during cell division. It localizes to centrosomes and helps stabilize microtubules by facilitating the recruitment of gamma-tubulin ring complexes (γTuRC). CEP57 also plays a role in interphase microtubule organization and ciliogenesis, making it essential for both proliferating neural progenitors and post-mitotic neurons.
Mutations in CEP57 cause Mosaic Variegated Aneuploidy (MVA) syndrome, characterized by mosaic aneuploidy, primary microcephaly, growth retardation, and predisposition to tumors. Beyond this developmental disorder, centrosome dysfunction is increasingly recognized as a contributor to adult-onset neurodegenerative diseases including Alzheimer's and Parkinson's disease.
| Property |
Value |
| Gene Symbol |
CEP57 |
| Full Name |
Centrosomal Protein 57 |
| Aliases |
CEP57, Translocated protein |
| Chromosome |
11q21 |
| NCBI Gene ID |
1164 |
| Ensembl |
ENSG00000166037 |
| UniProt |
Q8IWV1 |
| Protein Family |
Centrosomal proteins |
| Associated Diseases |
MVA syndrome, Primary microcephaly, cancer predisposition |
CEP57 possesses several functional features:
- N-terminal region: Centrosomal targeting domain
- Central region: Protein-protein interaction motifs
- C-terminal region: Microtubule binding capacity
- Nuclear localization signals: Additional nuclear functions
The protein forms homo-oligomers that are essential for its function in microtubule organization.
CEP57 localizes to:
- Centrosome core: PCM (pericentriolar material)
- Basal body: For ciliogenesis
- Midbody: During cytokinesis
- Nuclear envelope: In interphase cells
Microtubule organization:
- Gamma-tubulin recruitment: CEP57 facilitates γTuRC recruitment to centrosomes
- Microtubule nucleation: Promotes new microtubule formation
- Microtubule anchoring: Stabilizes microtubules at centrosomes
- Spindle assembly: Essential for proper mitotic spindle formation
Interphase functions:
- Interphase microtubule network organization
- Vesicle transport facilitation
- Cell polarity establishment
Ciliary functions:
- Basal body formation
- Cilia initiation and maintenance
- Signaling platform function
CEP57 expression:
- Highest in: Proliferating cells (neural progenitors, stem cells)
- Moderate in: Developing brain (cortex, cerebellum)
- Lower in: Post-mitotic neurons
- Tissue distribution: Ubiquitous but highest in testis, brain
CEP57 mutations cause MVA syndrome:
Clinical features:
- Mosaic aneuploidy (various chromosome gains/losses)
- Primary microcephaly (reduced brain volume)
- Growth retardation
- Developmental delay
- Seizures
- Tumor predisposition (various cancers)
Genetic mechanism:
- Biallelic loss-of-function mutations
- Mosaic aneuploidy arises from mitotic errors
- Phenotype severity correlates with aneuploidy level
Pathogenesis:
- CEP57 loss → spindle assembly defects
- Misaligned chromosomes during mitosis
- Unequal chromosome segregation
- Daughter cells with abnormal karyotypes
- Impaired neurogenesis → microcephaly
CEP57 is classified as an MCPH (Microcephaly) gene:
Mechanisms:
- Reduced neural progenitor proliferation
- Increased apoptosis during neurogenesis
- Impaired neuronal migration
- Altered brain wiring
Comparison with other MCPH genes:
- Shares mechanisms with ASPM, CDK5RAP2, WDR73
- Centrosome-related pathway
- Cell cycle regulation defects
Emerging links between CEP57 and AD:
Centrosome dysfunction:
- Centrosome abnormalities observed in AD neurons
- CEP57 expression altered in AD brains
- May contribute to cell cycle re-entry
Microtubule instability:
- Tau pathology affects microtubule organization
- CEP57 may compensate or be dysregulated
- Synaptic dysfunction connections
Cell cycle defects:
- Post-mitotic neurons re-enter cell cycle in AD
- Centrosome regulation is critical
- CEP57 may be involved
Centrosome and ciliary dysfunction in PD:
Primary cilia:
- Dopaminergic neurons have primary cilia
- Ciliary signaling disruptions in PD models
- CEP57 mutations affect cilia function
Centrosome:
- Centrosomal abnormalities in PD brains
- May contribute to neuronal vulnerability
- Links to LRRK2 and GBA pathways
Huntington's disease:
- Centrosome function impaired
- Cell cycle alterations
- Potential CEP57 involvement
Amyotrophic lateral sclerosis (ALS):
- Centrosome defects in motor neurons
- May contribute to degeneration
CEP57 functions in centrosome-mediated spindle assembly:
- Centrosome maturation → recruitment of PCM proteins
- γTuRC recruitment → microtubule nucleation
- Spindle bipolarity establishment → chromosome attachment
- Accurate segregation → proper cell division
- Centrosome maturation: CEP57 recruited during centrosome maturation
- Microtubule nucleation: γTuRC activation and microtubule growth
- Spindle bipolarity: Proper chromosome attachment
- Anaphase progression: Accurate segregation
- Basal body formation from centriole
- Ciliary vesicle formation
- Axoneme growth
- Primary cilium maturation
- Signaling platform function (Hedgehog, Wnt)
- G2/M transition: CEP57 levels peak
- Mitotic entry: Centrosome separation
- Metaphase: Spindle checkpoint
- Anaphase: Chromosome separation
- Cytokinesis: Midbody formation
- Gene therapy: Viral delivery of wild-type CEP57
- Cell cycle modulators: Control aneuploidy
- Microtubule stabilizers: Compensate for dysfunction
- Symptomatic treatment: Seizure control, supportive care
- Mosaic nature: Not all cells affected equally
- Timing: Critical developmental window
- Tumor risk: Cell cycle manipulation concerns
- BBB delivery: Brain targeting needed
| Strategy |
Stage |
Application |
| Gene therapy |
Preclinical |
AAV delivery |
| Microtubule stabilizers |
Research |
Taxol derivatives |
| Cell cycle inhibitors |
Research |
Prevent aneuploidy |
| Supportive care |
Clinical |
Symptom management |
- Organoid models: Brain organoids for drug testing
- CRISPR screening: Genetic modifiers
- Combination therapy: Multiple targets
- Biomarkers: Disease monitoring
| Protein/Gene |
Interaction Type |
Function |
Disease Relevance |
| γ-tubulin (TUBG1) |
Partner |
Microtubule nucleation |
Essential |
| Pericentriolar material |
Component |
Centrosome structure |
MCPH genes |
| CDK5RAP2 |
Partner |
Centrosome function |
MCPH |
| ASPM |
Partner |
Mitotic regulation |
MCPH |
| Aurora kinases |
Regulator |
Cell cycle control |
Cancer |
| PLK1 |
Regulator |
Centrosome maturation |
Cell cycle |
- Adult function: What is CEP57 role in mature neurons?
- Therapeutic targeting: How to modulate CEP57 safely?
- Disease links: More AD/PD connections to discover?
- Biomarkers: What indicates centrosome dysfunction?
- Genetic modifiers: What alters MVA phenotype?
- Single-cell analysis: Aneuploidy patterns in neurons
- Proteomics: CEP57 interaction networks
- iPSC models: Patient-derived neurons
- Gene therapy vectors: Brain-penetrant AAV
- Small molecule modulators: Microtubule-targeting