CEP290

CEP290
Name	CEP290
Other names	NPHP6, C-Nap1-like protein
Uniprot	Q96S42
Location	Chromosome 12q21.32

CEP290 is a large centrosomal and ciliary protein implicated in the assembly and function of primary cilia and centrosome-related processes. Disruption of CEP290 is associated with a spectrum of human ciliopathies, including Leber congenital amaurosis, Joubert syndrome, and Meckel–Gruber syndrome. Research into CEP290 bridges clinical genetics, cell biology, and developmental biology and involves collaborations among institutions such as the University of Cambridge, Harvard Medical School, and the National Institutes of Health.

Gene and protein structure

The CEP290 gene is located on human chromosome 12 and was characterized through positional cloning efforts involving groups at the Wellcome Trust Sanger Institute, Columbia University, and University College London. Genomic analyses referencing the Human Genome Project, ENCODE, and ClinVar databases revealed multiple exons and alternative splicing events identified by teams at the Broad Institute and the European Molecular Biology Laboratory. The encoded protein contains coiled-coil domains, an N-terminal microtubule-binding region, and multiple intrinsically disordered regions mapped using resources from the Protein Data Bank, UniProt, and the National Center for Biotechnology Information. Mutational surveys by investigators at the Johns Hopkins School of Medicine and Institut Pasteur catalog truncating and missense variants that cluster in functionally important domains.

Expression and subcellular localization

CEP290 expression profiling using datasets from the Genotype-Tissue Expression Project, GTEx, and the Human Protein Atlas shows high expression in photoreceptors, kidney tubules, and neural tissues studied at Massachusetts General Hospital and Stanford University. Immunofluorescence and super-resolution microscopy performed in laboratories at Max Planck Institute, Rockefeller University, and MIT localize the protein to the centrosome, the transition zone of primary cilia, and basal bodies characterized in work from the University of California, San Francisco and Kyoto University. Co-localization studies reference markers such as γ-tubulin, pericentrin, and acetylated tubulin used by researchers at Yale University and the University of Oxford.

Function in cilia and cellular processes

CEP290 functions as a structural and scaffolding component at the ciliary transition zone, coordinating protein trafficking with complexes characterized by groups at UC Berkeley, Cold Spring Harbor Laboratory, and the European Molecular Biology Organization. It interacts with other ciliopathy-related proteins studied by teams at INSERM, the Max Delbrück Center, and Boston Children’s Hospital, including components of the nephronophthisis module and BBSome complexes elucidated through proteomics at the Scripps Research Institute. CEP290 contributes to ciliogenesis, photoreceptor outer segment formation, and centrosome cohesion—processes investigated in model systems by laboratories at the University of Toronto, the University of Helsinki, and the University of Melbourne.

Clinical significance and associated disorders

Pathogenic variants in CEP290 cause a range of disorders described in clinical genetics cohorts at Moorfields Eye Hospital, Great Ormond Street Hospital, and the National Eye Institute. Phenotypes include Leber congenital amaurosis characterized in pediatric ophthalmology studies at Moorfields and the Scheie Eye Institute, Joubert syndrome reported by groups at the University of Utah and the University of Washington, and Meckel–Gruber syndrome documented by fetal pathology units at Karolinska Institutet and the University of Padua. Clinical trials and gene therapy efforts involving Editas Medicine, Genzyme, and University College London Hospitals focus on allele-specific strategies informed by genotype–phenotype correlations cataloged in OMIM and ClinGen.

Molecular mechanisms and pathogenesis

Pathogenic mechanisms involve loss of transition zone barrier function, impaired intraflagellar transport, and defective vesicular trafficking—pathways investigated by researchers at the European Molecular Biology Laboratory, the Whitehead Institute, and the Howard Hughes Medical Institute. Studies led by investigators at Johns Hopkins, the Salk Institute, and the University of California system reveal that truncating mutations produce dominant-negative or null effects affecting photoreceptor ciliogenesis and renal tubular polarity. Interactions with microtubule-associated proteins and signaling pathways such as Sonic hedgehog and Wnt have been examined in developmental genetics laboratories at Princeton University, the University of Cambridge, and the University of Pennsylvania.

Animal models and experimental studies

Animal models generated by groups at the Wellcome Trust Centre, the National Institute of Child Health and Human Development, and the European Zebrafish Resource Center include mouse knockouts, zebrafish morphants, and Xenopus depletion studies that recapitulate retinal degeneration and renal cystic phenotypes. Gene-editing efforts using CRISPR–Cas9 and antisense oligonucleotide therapies have been pursued by teams at the Francis Crick Institute, Boston Children’s Hospital, and the University of Iowa, demonstrating partial restoration of ciliary function and visual responses in preclinical models. Collaborative consortia involving the International Ciliopathy Alliance and the Retinal Research Foundation coordinate translational research and natural history studies.

Category:Proteins Category:Ciliopathy genes