Wycisk, K A; Zeitz, C; Feil, S; Wittmer, M; Forster, U; Neidhardt, J; Wissinger, B; Zrenner, E; Wilke, R; Kohl, S; Berger, W (2006). Mutation in the auxiliary calcium-channel subunit CACNA2D4 causes autosomal recessive cone dystrophy. American Journal of Human Genetics, 79(5):973-977.
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Retinal signal transmission depends on the activity of high voltage-gated l-type calcium channels in photoreceptor ribbon synapses. We recently identified a truncating frameshift mutation in the Cacna2d4 gene in a spontaneous mouse mutant with profound loss of retinal signaling and an abnormal morphology of ribbon synapses in rods and cones. The Cacna2d4 gene encodes an l-type calcium-channel auxiliary subunit of the alpha (2) delta type. Mutations in its human orthologue, CACNA2D4, were not yet known to be associated with a disease. We performed mutation analyses of 34 patients who received an initial diagnosis of night blindness, and, in two affected siblings, we detected a homozygous nucleotide substitution (c.2406C-->A) in CACNA2D4. The mutation introduces a premature stop codon that truncates one-third of the corresponding open reading frame. Both patients share symptoms of slowly progressing cone dystrophy. These findings represent the first report of a mutation in the human CACNA2D4 gene and define a novel gene defect that causes autosomal recessive cone dystrophy.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Institute of Medical Molecular Genetics|
|DDC:||570 Life sciences; biology|
610 Medicine & health
|Deposited On:||03 Mar 2011 13:51|
|Last Modified:||23 Nov 2012 13:22|
|Free access at:||PubMed ID. An embargo period may apply.|
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