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Wycisk, K A; Budde, B; Feil, S; et al; Buzzi, F; Neidhardt, J; Glaus, E; Nürnberg, P; Berger, W (2006). Structural and functional abnormalities of retinal ribbon synapses due to Cacna2d4 mutation. Investigative Ophthalmology and Visual Science, 47(8):3523-3530.

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PURPOSE: In a spontaneous mutant substrain of C57BL/10 mice, severely affected retinal ribbon-type synapses have been described. The retinopathy was accompanied by a substantial loss in the activities of the second-order neurons. Rod photoreceptor responses were maintained with reduced amplitude, whereas cone activities were absent. This study was conducted to identify the genetic defect underlying this hitherto unknown autosomal recessive cone-rod dysfunction. METHODS: Genome-wide linkage analysis and screening of positional candidate genes were used to identify the causative mutation. Tissue-specific transcriptional activity of the defective gene was determined by Northern blot analysis and RT-PCR approaches. The number of cone photoreceptors was estimated by immunohistochemistry. RESULTS: The mutation was localized to a 275-kb region of chromosome 6. Within this candidate interval, a homozygous frameshift mutation (c.2367insC) was identified in the Cacna2d4 gene of affected animals. This gene codes for an L-type calcium channel auxiliary subunit of the alpha2delta type. The mutation introduces a premature stop codon that truncates one third of the predicted Cacna2d4 protein. A severe reduction in Cacna2d4 transcript levels observed in mutant retinas probably results in the lack of Cacna2d4 protein. The mutation leads to significant loss of rods, whereas the number of cone cells remains unaffected until 6 weeks of age. CONCLUSIONS: The Cacna2d4 mutation underlies a novel channelopathy leading to cone-rod dysfunction in the visual system of mice and provides a new candidate gene for human retinal disorders including night blindness, retinitis pigmentosa, and cone-rod dystrophies.


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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 12:49
Last Modified:05 Apr 2016 14:25
Publisher:Association for Research in Vision and Ophthalmology
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:10.1167/iovs.06-0271
PubMed ID:16877424

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