NDLI: Moderate reduction of Norrin signaling activity associated with the causative missense mutations identified in patients with familial exudative vitreoretinopathy

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Moderate reduction of Norrin signaling activity associated with the causative missense mutations identified in patients with familial exudative vitreoretinopathy

Content Provider	Springer Nature Link
Author	Qin, Minghui Kondo, Hiroyuki Tahira, Tomoko Hayashi, Kenshi
Copyright Year	2007
Abstract	Mutations in Norrin signaling genes (NDP, FZD4 and LRP5) have been found in patients with familial exudative vitreoretinopathy (FEVR) and the altered signaling is suspected to play a critical role in its pathogenesis. To better understand this relationship, we systematically performed functional analyses on previously identified single nucleotide variants of LRP5, FZD4 and NDP, utilizing the Norrin dependent Topflash reporter assay. Cell surface binding assays and protein electrophoresis analysis of Norrin were also performed. Seven causative mutations and five possibly causative but indecisive variants were examined. We found: (1) a nonsense mutation in FZD4 completely abolished its signaling activity, while single missense mutations in LRP5 and FZD4 caused a moderate level of reduction (ranging from 26 to 48, 36% on average) and a double missense mutation in both genes caused a severe reduction in activity (71%). These observations correlated roughly with clinical phenotypes. (2) A mutational effect is suggested in four of five indecisive variants by signaling reductions comparable to those of missense mutations. (3) Norrin mutants demonstrated variable effects on signal transduction, and no apparent correlation with clinical phenotypes was observed. (4) The Norrin mutants examined demonstrated impaired cell surface binding, and some may have partially lost their ability to form a complex with unknown high molecular weight material(s). Our results illustrate the nature of FEVR in relation to Norrin signaling and further suggest the complexity of its disease causing mechanism.
Starting Page	615
Ending Page	623
Page Count	9
File Format	PDF
ISSN	03406717
Journal	Human Genetics
Volume Number	122
Issue Number	6
e-ISSN	14321203
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-10-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metabolic Diseases Internal Medicine Molecular Medicine Human Genetics
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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