Dystrophin and beta-dystroglycan in photoreceptor terminals from normal and mdx3Cv mouse retinae

Blank, Martina, Koulen, Peter, Blake, Derek J. ORCID: https://orcid.org/0000-0002-5005-4731 and Kröger, Stephan 1999. Dystrophin and beta-dystroglycan in photoreceptor terminals from normal and mdx3Cv mouse retinae. European Journal of Neuroscience 11 (6) , pp. 2121-2133. 10.1046/j.1460-9568.1999.00636.x

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Abstract

Mutations in the dystrophin gene cause muscular dystrophy as well as cognitive impairments, including an abnormal dark-adapted electroretinogram. To investigate the basis for the ocular phenotype, we analysed dystrophin and the dystrophin-associated protein β-dystroglycan in retinae from mdx3Cv mice. This strain has a mutation in the dystrophin gene and abnormalities in the electroretinogram which are similar to those of muscular dystrophy patients. Despite an overall reduction of all dystrophin isoforms and of β-dystroglycan in retinal tissue from mutant mice, we observed no apparent change in the histotypic layering of the retina, or in the ultrastructure of several specific cell types, including rods and cones. In retinae from wild type and mdx3Cv mice, dystrophin and β-dystroglycan were concentrated in small extensions of rod and cone photoreceptor terminals protruding into the outer plexiform layer. Beta-dystroglycan but not dystrophin was also clustered around the inner limiting membrane and the capillary basal laminae. While the labelling pattern around the basal laminae was not altered in the mutant mice, we found that the area as well as the intensity of the dystrophin and β-dystroglycan immunoreactivity associated with the terminals of rod photoreceptors were severely reduced. The same parameters were much less affected in cone terminals. These results show, that dystrophin and β-dystroglycan are differentially distributed in the retina, and that a severe reduction of dystrophin has no gross effect on retinal structure, but could influence intraretinal signalling at the level of the photoreceptor terminals. Moreover, the mutation in mdx3Cv mice has a selective effect on rods, providing an explanation for the altered electroretinogram.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects:	R Medicine > R Medicine (General)
Uncontrolled Keywords:	electroretinogram; muscular dystrophy; outer plexiform layer; photoreceptor; retina
Publisher:	Wiley-Blackwell
ISSN:	0953-816X
Last Modified:	24 Oct 2022 11:47
URI:	https://orca.cardiff.ac.uk/id/eprint/49314

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