| Property | Value |
|---|---|
| Gene Symbol | CEP290 |
| Full Name | Centrosomal Protein 290 |
| Chromosomal Location | 12q21.32 |
| NCBI Gene ID | 27002 |
| OMIM ID | 613037 |
| Ensembl ID | ENSG00000148377 |
| UniProt ID | Q5HYJ4 |
| Encoded Protein | CEP290 |
| Associated Diseases | Joubert Syndrome, Leber Congenital Amaurosis, Meckel Syndrome, Bardet-Biedl Syndrome, Retinitis Pigmentosa |
CEP290 encodes a massive centrosomal protein localized to the centrosome and ciliary transition zone. With a molecular weight of approximately 290 kDa, CEP290 is one of the largest ciliary proteins and functions as a critical scaffold that recruits other ciliary components for proper cilia and flagella assembly[@sayer2006].
The protein plays essential roles in:
CEP290 mutations cause a spectrum of human diseases collectively termed ciliopathies, including Joubert syndrome, Leber congenital amaurosis (LCA), Meckel syndrome, and Bardet-Biedl syndrome[@coppieters2010][@lancaster2011].
CEP290 was identified in 2006 through positional cloning of the gene causing Leber congenital amaurosis type 10 (LCA10), one of the most severe forms of inherited retinal blindness.
Key milestones:
| Feature | Details |
|---|---|
| Chromosome | 12q21.32 |
| Strand | Minus strand |
| Exons | 38 |
| Transcript length | ~7.5 kb coding region |
| Protein length | 2,479 amino acids |
The CEP290 protein contains multiple functional domains:
| Domain | Position | Function |
|---|---|---|
| N-terminal | 1-500 | Protein interactions |
| Coiled-coil | 500-800 | Dimerization |
| Pony domain | 800-1200 | Ciliary localization |
| Microtubule-binding | 1500-1800 | Cytoskeleton |
| C-terminal | 1800-2479 | Centrosomal targeting |
CEP290 is essential for primary cilia formation[@chang2019]:
The CEP290 complex at the transition zone acts as a gate:
In photoreceptor cells, CEP290 is critical[@giles2020]:
| Photoreceptor Component | CEP290 Function |
|---|---|
| Outer segment | Ciliary structure |
| Opsin transport | IFT trafficking |
| Disk morphogenesis | Membrane organization |
| Survival | Cell viability |
CEP290 binds and organizes microtubules[@kim2020]:
Primary cilia serve as cellular antennae:
| Ciliary Function | CEP290 Contribution |
|---|---|
| Hedgehog signaling | Required for pathway |
| Wnt signaling | Modulates pathway |
| PDGF signaling | Receptor trafficking |
| Mechanosensation | Calcium channels |
CEP290 functions in cell division[@chen2021]:
CEP290 is essential for brain development[@davis2017]:
| Brain Region | CEP290 Function |
|---|---|
| Cerebellar vermis | Development |
| Corpus callosum | Axon guidance |
| Neural tube | Patterning |
| Region | Expression Level | Notes |
|---|---|---|
| Cerebellum | Very high | Purkinje cells |
| Cerebral cortex | High | Pyramidal neurons |
| Hippocampus | Moderate | CA neurons |
| Retina | Very high | Photoreceptors |
| Kidney | High | Tubular cells |
| Liver | Moderate | Hepatocytes |
| Cell Type | Expression | Function |
|---|---|---|
| Photoreceptors | Very high | Ciliary function |
| Neurons | High | Cilia/centrosome |
| Kidney cells | High | Ciliary function |
| Fibroblasts | Moderate | Basal body |
CEP290 mutations cause LCA10, the most common cause of congenital retinal blindness[@brauerman2019]:
| LCA10 Feature | Description |
|---|---|
| Onset | Birth to 12 months |
| Visual acuity | <20/400 |
| Nystagmus | Present |
| Photophobia | Often present |
| Oculodigital sign | Common |
| ERG | Extinguished |
CEP290 is one of over 40 genes causing Joubert syndrome[@lancaster2011]:
| Joubert Feature | Description |
|---|---|
| Cerebellar vermis | Hypoplastic |
| "Molar tooth sign" | Pathognomonic |
| Developmental delay | Variable |
| Ocular involvement | Common |
| Renal disease | 30% |
| Disorder | CEP290 Contribution |
|---|---|
| Meckel syndrome | Severe form |
| Bardet-Biedl | Modifier |
| Senior-Loken | Renal-retinal |
Intravitreal AAV gene therapy has shown tremendous promise[@brauerman2019]:
| Trial Phase | Results |
|---|---|
| Preclinical | Efficacy in mice |
| Phase I/II | Safety, some efficacy |
| Phase III | Ongoing |
The therapy uses AAV serotype 2.7m8, a capsid optimized for photoreceptor targeting.
For splice-site mutations:
Approaches under investigation:
| Partner | Interaction Type | Functional Consequence |
|---|---|---|
| RPGR | Interaction | Retinal function |
| IQCB1 | Complex | Ciliary targeting |
| NPHP5 | Complex | Transition zone |
| IFT proteins | Interaction | Ciliary trafficking |
| BBS proteins | Complex | Ciliogenesis |
| Pathway | Modulation |
|---|---|
| Hedgehog | Required |
| Wnt | Modulates |
| mTOR | Regulates |
| DNA damage | Checkpoint |
CEP290 knockout models show ciliary defects:
| Model | Phenotype | Relevance |
|---|---|---|
| Mouse | Retinal degeneration | LCA model |
| Zebrafish | Ciliary failure | Ciliopathy |
| C. elegans | Sensory defects | Cilia function |
| Method | Application |
|---|---|
| Sanger sequencing | Specific variants |
| Gene panels | Ciliopathy testing |
| WES | Unknown cases |
| WGS | Non-coding variants |
| Biomarker | Use |
|---|---|
| OCT imaging | Retinal structure |
| ERG | Function |
| Autofluorescence | Storage |