14/10/2026
Partial in vitro rescue of NPHP5-associated retinal ciliopathy via AAV-mediated delivery
The authors found that patient cells exhibited abnormally elongated primary cilia, reduced expression of CEP290, a key transition-zone protein that interacts with NPHP5, and evidence of defective ciliary trafficking. In retinal organoids, photoreceptors developed normally at early stages but later showed impaired outer-segment formation, diminished connecting cilia, and mislocalization of photoreceptor proteins, including rhodopsin and cone opsins, indicating defective photoreceptor maturation and function. Importantly, adeno-associated virus (AAV)-mediated delivery of a normal IQCB1/NPHP5 gene partially restored outer-segment development, corrected protein mislocalization, and increased CEP290 levels.
The findings suggest that NPHP5 is required for proper ciliary gate function and photoreceptor outer-segment biogenesis. Overall, the study establishes a robust human retinal organoid model of NPHP5-LCA and provides strong preclinical evidence supporting gene augmentation therapy as a potential treatment.
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