Normal Function
The CEP290 gene provides instructions for making a protein that is present in many types of cells, including the eye's light-sensing cells (photoreceptors). Photoreceptors are found in the specialized tissue at the back of the eye that detects light and color (retina
).
Studies suggest that the CEP290 protein plays an important role in cell structures called centrosomes and cilia. Centrosomes are involved in cell division and the assembly of microtubules. Microtubules are fibers that help cells maintain their shape, assist in the process of cell division, and are essential for transporting materials within cells.
Cilia are microscopic, finger-like projections that are found in many types of cells, including photoreceptors. Primary cilia are necessary for the perception of sensory input, such as vision, hearing, and smell. Photoreceptors contain primary cilia and are important for maintaining the normal structure and function of the retina.
Photoreceptors have two main parts: an inner segment and an outer segment. These segments are connected by a single primary cilia (cilium) called the connecting cilium. Microtubules within the connecting cilium provide structural support and help transport materials between the inner and outer segments. Within the connecting cilium, the CEP290 proteins help anchor the microtubules and regulate the transport of proteins between the two segments.
Health Conditions Related to Genetic Changes
Leber congenital amaurosis
Genetic changes that cause disease are called pathogenic variants. Pathogenic variants in the CEP290 gene can cause Leber congenital amaurosis type 10. Leber congenital amaurosis is a group of eye disorders that affect the retina. Pathogenic variants in the CEP290 gene account for 15 to 20 percent of all cases of Leber congenital amaurosis.
A particular genetic change, written as 2991+1655A>G, is the most common CEP290 pathogenic variant that is associated with Leber congenital amaurosis type 10. This variant creates a premature stop signal in the instructions for making the CEP290 protein, which reduces the number of functional proteins.
Pathogenic variants in the CEP290 gene are thought to impair the transport of essential proteins from the inner segment to the outer segment of photoreceptors. As a result, the photoreceptors may not work properly, leading to the visual impairment that is characteristic of Leber congenital amaurosis type 10.
More About This Health ConditionBardet-Biedl syndrome
MedlinePlus Genetics provides information about Bardet-Biedl syndrome
More About This Health ConditionJoubert syndrome
MedlinePlus Genetics provides information about Joubert syndrome
More About This Health ConditionMeckel syndrome
MedlinePlus Genetics provides information about Meckel syndrome
More About This Health ConditionSenior-Løken syndrome
MedlinePlus Genetics provides information about Senior-Løken syndrome
More About This Health ConditionOther Names for This Gene
- Bardet-Biedl syndrome 14
- BBS14
- JBTS5
- Joubert syndrome 5
- KIAA0373
- LCA10
- Meckel syndrome, type 4
- MKS4
- nephrocytsin-6
- NPHP6
- SLSN6
Additional Information & Resources
Tests Listed in the Genetic Testing Registry
Scientific Articles on PubMed
Catalog of Genes and Diseases from OMIM
References
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