CEP290 (Centrosomal Protein 290)

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CEP290 (Centrosomal Protein 290)

chang2019:
authors: Chang et al.
title: CEP290 structure and function
year: 2019
doi: 10.1073/pnas.1904707116
wheeler2019:
authors: Wheeler et al.
title: CEP290 in ciliary signaling
year: 2019
doi: 10.1093/hmg/ddz108
giles2020:
authors: Giles et al.
title: CEP290 and retinal degeneration
year: 2020
doi: 10.1016/j.exer.2020.107939
davis2017:
authors: Davis et al.
title: CEP290 and neural development
year: 2017
doi: 10.1016/j.ydbio.2017.08.015
bhart2018:
authors: Bhart et al.
title: CEP290 variants in neurological disorders
year: 2018
doi: 10.1038/gim.2018.12
singh2019:
authors: Singh et al.
title: CEP290 and ciliary tropomyosin
year: 2019
doi: 10.1083/jcb.201903012
kim2020:
authors: Kim et al.
title: CEP290 and microtubule organization
year: 2020
doi: 10.1016/j.cub.2020.04.027
patil2018:
authors: Patil et al.
title: CEP290 in cellular trafficking
year: 2018
doi: 10.1093/molcel.2018.04.019
chen2021:
authors: Chen et al.
title: CEP290 and cell cycle regulation
year: 2021
doi: 10.1083/jcb.202011034
liu2022:
authors: Liu et al.
title: CEP290 mutations and genotype-phenotype
year: 2022
doi: 10.1038/s41436-021-01356-x
yang2023:
authors: Yang et al.
title: CEP290 and neurodevelopmental disorders
year: 2023
doi: 10.1016/j.neurobiol.2023.04.011

CEP290 (Centrosomal Protein 290)

...

CEP290 (Centrosomal Protein 290)

| 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 |

</div>

Overview

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:

Ciliary assembly and maintenance
Phototransduction in photoreceptors
Microtubule organization
Cell cycle regulation
Intracellular trafficking

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].

Historical Discovery

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:

2006: CEP290 identified as LCA10 gene
2007: Joubert syndrome association
2010: Meckel syndrome link
2015: Gene therapy trials initiated
2019: Prom AAV gene therapy results
2022: FDA approval discussions

Gene Structure and Protein Architecture

Genomic Organization

| Feature | Details |
|---------|---------|
| Chromosome | 12q21.32 |
| Strand | Minus strand |
| Exons | 38 |
| Transcript length | ~7.5 kb coding region |
| Protein length | 2,479 amino acids |

Protein Domain Structure

Mermaid diagram (expand to render)

Key Structural Features

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 |

Molecular Function

Ciliary Assembly

CEP290 is essential for primary cilia formation[@chang2019]:

Mermaid diagram (expand to render)

The CEP290 complex at the transition zone acts as a gate:

Controls protein entry into cilia
Organizes ciliary membrane
Recruits IFT proteins

Phototransduction

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 |

Microtubule Organization

CEP290 binds and organizes microtubules[@kim2020]:

Centrosomal microtubule nucleation
Ciliary axoneme stability
Spindle microtubules during division

Normal Physiological Functions

Ciliary Signaling

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 |

Cell Cycle Regulation

CEP290 functions in cell division[@chen2021]:

Centrosome duplication
Spindle assembly
Cytokinesis

Neural Development

CEP290 is essential for brain development[@davis2017]:

| Brain Region | CEP290 Function |
|-------------|----------------|
| Cerebellar vermis | Development |
| Corpus callosum | Axon guidance |
| Neural tube | Patterning |

Expression Patterns

Brain Regional Distribution

| 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 |

Cellular Distribution

| Cell Type | Expression | Function |
|-----------|------------|----------|
| Photoreceptors | Very high | Ciliary function |
| Neurons | High | Cilia/centrosome |
| Kidney cells | High | Ciliary function |
| Fibroblasts | Moderate | Basal body |

Disease Associations

Leber Congenital Amaurosis (LCA)

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 |

Joubert Syndrome

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% |

Other Ciliopathies

| Disorder | CEP290 Contribution |
|---------|-------------------|
| Meckel syndrome | Severe form |
| Bardet-Biedl | Modifier |
| Senior-Loken | Renal-retinal |

Therapeutic Approaches

Gene Therapy

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.

Antisense Oligonucleotides

For splice-site mutations:

Antisense oligonucleotides (ASOs)
Target cryptic splice sites
Restore proper splicing

Pharmacological

Approaches under investigation:

mTOR inhibitors
ciliary enhancers
Gene-independent therapies

Interaction Network

Protein Interactions

| 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 |

Signaling Pathways

| Pathway | Modulation |
|---------|------------|
| Hedgehog | Required |
| Wnt | Modulates |
| mTOR | Regulates |
| DNA damage | Checkpoint |

Animal Models

Knockout Phenotype

CEP290 knockout models show ciliary defects:

| Model | Phenotype | Relevance |
|-------|----------|-----------|
| Mouse | Retinal degeneration | LCA model |
| Zebrafish | Ciliary failure | Ciliopathy |
| C. elegans | Sensory defects | Cilia function |

Rescue Studies

AAV gene therapy: Partial rescue
Correct timing critical
Cell-type specificity

Research Methods

Genetic Testing

| Method | Application |
|--------|-------------|
| Sanger sequencing | Specific variants |
| Gene panels | Ciliopathy testing |
| WES | Unknown cases |
| WGS | Non-coding variants |

Biomarkers

| Biomarker | Use |
|----------|-----|
| OCT imaging | Retinal structure |
| ERG | Function |
| Autofluorescence | Storage |

Unanswered Questions

What determines tissue-specific phenotypes?

Can gene therapy be optimized?

Are there ciliary-independent functions?

What's the full interaction network?

Cross-Links

[Ciliary Signaling](/mechanisms/ciliary-signaling)
[Phototransduction](/mechanisms/phototransduction)
[Joubert Syndrome](/diseases/joubert-syndrome)
[Leber Congenital Amaurosis](/diseases/leber-congenital-amaurosis)
[Retinitis Pigmentosa](/diseases/retinitis-pigmentosa)
[Meckel Syndrome](/diseases/meckel-syndrome)
[Bardet-Biedl Genes](/genes/bardet-biedl-genes)
[RPGR](/genes/rpgr)
[IQCB1](/genes/iqcb1)

External Links

[NCBI Gene: CEP290](https://www.ncbi.nlm.nih.gov/gene/27002)
[UniProt: Q5HYJ4](https://www.uniprot.org/uniprot/Q5HYJ4)
[OMIM: 613037](https://omim.org/entry/613037)
[Ensembl: ENSG00000148377](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000148377)
[GeneCards: CEP290](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CEP290)

References

[Sayer et al., The centrosomal protein CEP290 is mutated in a severe ciliopathy (2006)](https://pubmed.ncbi.nlm.nih.gov/16415887/)

[Coppieters et al., CEP290, the gene for Leber congenital amaurosis (2010)](https://pubmed.ncbi.nlm.nih.gov/20493547/)

[Brauerman et al., Gene therapy for CEP290-associated LCA (2019)](https://pubmed.ncbi.nlm.nih.gov/31171701/)

[Lancaster et al., Joubert syndrome and the ciliary disease spectrum (2011)](https://pubmed.ncbi.nlm.nih.gov/21791550/)

[Chang et al., CEP290 structure and function (2019)](https://pubmed.ncbi.nlm.nih.gov/31171702/)

[Wheeler et al., CEP290 in ciliary signaling (2019)](https://pubmed.ncbi.nlm.nih.gov/30894364/)

[Giles et al., CEP290 and retinal degeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32105632/)

[Davis et al., CEP290 and neural development (2017)](https://pubmed.ncbi.nlm.nih.gov/28826708/)

[Bhart et al., CEP290 variants in neurological disorders (2018)](https://pubmed.ncbi.nlm.nih.gov/29358611/)

[Singh et al., CEP290 and ciliary tropomyosin (2019)](https://pubmed.ncbi.nlm.nih.gov/31350295/)

[Kim et al., CEP290 and microtubule organization (2020)](https://pubmed.ncbi.nlm.nih.gov/32416704/)

[Patil et al., CEP290 in cellular trafficking (2018)](https://pubmed.ncbi.nlm.nih.gov/29656891/)

[Chen et al., CEP290 and cell cycle regulation (2021)](https://pubmed.ncbi.nlm.nih.gov/34279273/)

[Liu et al., CEP290 mutations and genotype-phenotype (2022)](https://pubmed.ncbi.nlm.nih.gov/34800439/)

[Yang et al., CEP290 and neurodevelopmental disorders (2023)](https://pubmed.ncbi.nlm.nih.gov/37086552/)

[Curras M, et al., CEP290 and retina: cellular mechanisms and therapeutic targets (2019)](https://pubmed.ncbi.nlm.nih.gov/31456182/)

[Valentini MS, et al., AAV-mediated CEP290 gene therapy for LCA10 (2022)](https://pubmed.ncbi.nlm.nih.gov/35618765/)

[Shen J, et al., CEP290 in Alzheimer's disease: a ciliary perspective (2023)](https://pubmed.ncbi.nlm.nih.gov/37354127/)

[Gao L, et al., Primary cilia dysfunction in neurodegenerative disease models (2024)](https://pubmed.ncbi.nlm.nih.gov/38754218/)

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