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TRPM1 Is Mutated in Patients with Autosomal-Recessive Complete Congenital Stationary Night Blindness


Audo, I; Kohl, S; Leroy, B P; Munier, F L; Guillonneau, X; Mohand-Saïd, S; Bujakowska, K; Nandrot, E; Lorenz, B; Preising, M; Kellner, U; Renner, A; Bernd, A; Antonio, A; Moskova-Doumanova, V; Lancelot, M E; Poloschek, C M; Drumare, I; Defoort-Dhellemmes, S; Wissinger, B; Léveillard, T; Hamel, C P; Schorderet, D F; De Baere, E; Berger, W; Jacobson, S G; Zrenner, E; Sahel, J A; Bhattacharya, S S; Zeitz, C (2009). TRPM1 Is Mutated in Patients with Autosomal-Recessive Complete Congenital Stationary Night Blindness. American Journal of Human Genetics, 85(5):720-729.

Abstract

Night vision requires signaling from rod photoreceptors to adjacent bipolar cells in the retina. Mutations in the genes NYX and GRM6, expressed in ON bipolar cells, lead to a disruption of the ON bipolar cell response. This dysfunction is present in patients with complete
X-linked and autosomal-recessive congenital stationary night blindness (CSNB) and can be assessed by standard full-field electroretinography (ERG), showing severely reduced rod b-wave amplitude and slightly altered cone responses. Although many cases of complete CSNB (cCSNB) are caused by mutations in NYX and GRM6, in ~60% of the patients the gene defect remains unknown. Animal models
of human diseases are a good source for candidate genes, and we noted that a cCSNB phenotype present in homozygous Appaloosa horses is associated with downregulation of TRPM1. TRPM1, belonging to the family of transient receptor potential channels, is expressed in ON bipolar cells and therefore qualifies as an excellent candidate. Indeed, mutation analysis of 38 patients with CSNB identified ten unrelated cCSNB patients with 14 different mutations in this gene. The mutation spectrum comprises missense, splice-site, deletion, and nonsense mutations.We propose that the cCSNB phenotype in these patients is due to the absence of functional TRPM1 in retinal ON bipolar cells.

Night vision requires signaling from rod photoreceptors to adjacent bipolar cells in the retina. Mutations in the genes NYX and GRM6, expressed in ON bipolar cells, lead to a disruption of the ON bipolar cell response. This dysfunction is present in patients with complete
X-linked and autosomal-recessive congenital stationary night blindness (CSNB) and can be assessed by standard full-field electroretinography (ERG), showing severely reduced rod b-wave amplitude and slightly altered cone responses. Although many cases of complete CSNB (cCSNB) are caused by mutations in NYX and GRM6, in ~60% of the patients the gene defect remains unknown. Animal models
of human diseases are a good source for candidate genes, and we noted that a cCSNB phenotype present in homozygous Appaloosa horses is associated with downregulation of TRPM1. TRPM1, belonging to the family of transient receptor potential channels, is expressed in ON bipolar cells and therefore qualifies as an excellent candidate. Indeed, mutation analysis of 38 patients with CSNB identified ten unrelated cCSNB patients with 14 different mutations in this gene. The mutation spectrum comprises missense, splice-site, deletion, and nonsense mutations.We propose that the cCSNB phenotype in these patients is due to the absence of functional TRPM1 in retinal ON bipolar cells.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Medical Molecular Genetics
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:13 November 2009
Deposited On:25 Nov 2009 07:29
Last Modified:05 Apr 2016 13:34
Publisher:Elsevier
ISSN:0002-9297
Publisher DOI:10.1016/j.ajhg.2009.10.013
PubMed ID:19896113
Permanent URL: http://doi.org/10.5167/uzh-24421

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