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Updated: Mar 19, 2026
07:07
Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
Published on: February 21, 2016
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Ciliopathy-associated IQCB1/NPHP5 protein is required for mouse photoreceptor outer segment formation
Cecinio C Ronquillo1, Christin Hanke-Gogokhia2, Monica P Revelo3
1Department of Ophthalmology, John A. Moran Eye Center, University of Utah Health Science Center, Salt Lake City, Utah, USA.
Summary
Nephrocystin-5 (NPHP5) is crucial for photoreceptor outer segment formation in mice, a key factor in ciliopathies like Senior-Løken syndrome. Its absence causes Leber congenital amaurosis-like symptoms but does not affect kidney or fibroblast cilia.
Area of Science:
- Cell Biology
- Genetics
- Ophthalmology
Background:
- Senior-Løken syndrome, a ciliopathy, is frequently caused by null mutations in the IQCB1/NPHP5 gene.
- The NPHP5 protein is essential for the function of cilia, which are involved in various cellular processes.
Purpose of the Study:
- To investigate the role of NPHP5 in photoreceptor development and ciliogenesis.
- To determine if NPHP5 is essential for kidney and general ciliary function.
Main Methods:
- Generation of germline Nphp5-knockout mice using a β-Geo gene trap.
- Assessment of retinal function using electroretinography.
- Ultrastructural analysis of photoreceptors and cilia using electron microscopy.
- Histological examination of kidneys and analysis of cilia in mouse embryonic fibroblasts.
Main Results:
- Nphp5 knockout mice displayed absence of electroretinogram responses, mimicking Leber congenital amaurosis.
- Photoreceptor outer segment formation was severely impaired, with aberrant transition zones.
- Photoreceptor degeneration was observed but delayed in cone-only retinas.
- Nphp5 knockout did not affect cilia formation in mouse embryonic fibroblasts or kidney histology.
Conclusions:
- NPHP5 is essential for the proper formation of photoreceptor outer segments.
- NPHP5 is dispensable for kidney and general ciliary formation in mouse embryonic fibroblasts.
- These findings highlight NPHP5's specific role in photoreceptor ciliogenesis and its link to Leber congenital amaurosis.
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