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Hum Mol Genet December 1, 2008; 17 (23): 3655-62.

Genetic and physical interaction between the NPHP5 and NPHP6 gene products.

Schäfer T , Pütz M , Lienkamp S , Ganner A , Bergbreiter A , Ramachandran H , Gieloff V , Gerner M , Mattonet C , Czarnecki PG , Sayer JA , Otto EA , Hildebrandt F , Kramer-Zucker A , Walz G .

Nephronophthisis (NPHP) is an autosomal recessive cystic kidney disease, caused by mutations of at least nine different genes. Several extrarenal manifestations characterize this disorder, including cerebellar defects, situs inversus and retinitis pigmentosa. While the clinical manifestations vary significantly in NPHP, mutations of NPHP5 and NPHP6 are always associated with progressive blindness. This clinical finding suggests that the gene products, nephrocystin-5 and nephrocystin-6, participate in overlapping signaling pathways to maintain photoreceptor homeostasis. To analyze the genetic interaction between these two proteins in more detail, we studied zebrafish embryos after depletion of NPHP5 and NPHP6. Knockdown of zebrafish zNPHP5 and zNPHP6 produced similar phenotypes, and synergistic effects were observed after the combined knockdown of zNPHP5 and zNPHP6. The N-terminal domain of nephrocystin-6-bound nephrocystin-5, and mapping studies delineated the interacting site from amino acid 696 to 896 of NPHP6. In Xenopus laevis, knockdown of NPHP5 caused substantial neural tube closure defects. This phenotype was copied by expression of the nephrocystin-5-binding fragment of nephrocystin-6, and rescued by co-expression of nephrocystin-5, supporting a physical interaction between both gene products in vivo. Since the N- and C-terminal fragments of nephrocystin-6 engage in the formation of homo- and heteromeric protein complexes, conformational changes seem to regulate the interaction of nephrocystin-6 with its binding partners.

PubMed ID: 18723859
PMC ID: PMC2802281
Article link: Hum Mol Genet
Grant support: [+]

Species referenced: Xenopus
Genes referenced: cep290 iqcb1 nphp1 sox3
Morpholinos: iqcb1 MO1

Disease Ontology terms: neural tube defect [+]

Article Images: [+] show captions
References [+] :
Arts, Mutations in the gene encoding the basal body protein RPGRIP1L, a nephrocystin-4 interactor, cause Joubert syndrome. 2007, Pubmed