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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.


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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
Deposited On:03 Mar 2011 12:51
Last Modified:05 Apr 2016 14:25
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:10.1086/508944
PubMed ID:17033974

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