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Publication : Simulation of human autosomal dominant retinitis pigmentosa in transgenic mice expressing a mutated murine opsin gene.

First Author  Naash MI Year  1993
Journal  Proc Natl Acad Sci U S A Volume  90
Issue  12 Pages  5499-503
PubMed ID  8516292 Mgi Jnum  J:12791
Mgi Id  MGI:61010 Doi  10.1073/pnas.90.12.5499
Citation  Naash MI, et al. (1993) Simulation of human autosomal dominant retinitis pigmentosa in transgenic mice expressing a mutated murine opsin gene. Proc Natl Acad Sci U S A 90(12):5499-503
abstractText  Autosomal dominant retinitis pigmentosa (ADRP), slowly progressing over decades, leads to severe visual impairment and in some cases to complete blindness. More than 40 mutations in the human opsin gene have been linked to some forms of this genetically heterogeneous disease. In photoreceptor cells of ADRP patients with mutations in the opsin gene, normal rhodopsin is thought to be synthesized concomitantly with mutated rhodopsin, which, by an unknown mechanism, causes the slow degeneration of the photoreceptor cells. To establish a transgenic mouse line that carries a mutated mouse opsin gene in addition to the endogenous opsin gene, we introduced a mouse opsin gene containing mutations in exon 1 into the germ line of a normal mouse. The alterations consisted of three amino acid substitutions near the N terminus of rhodopsin, Val-20-->Gly (V20G), Pro-23-->His (P23H), and Pro-27-->Leu (P27L). The P23H mutation is the most prevalent mutation in human ADRP patients. During early postnatal development, mice heterozygous for the mutated opsin gene appear to develop normal photoreceptors, but their light-sensitive outer segments never reach normal length. With advancing age, both rod and cone photoreceptors are reduced progressively in number. The slow degeneration of the transgenic retina is associated with a gradual decrease of light-evoked electroretinogram responses. Our results show that simultaneous expression of mutated and normal opsin genes induces a slow degeneration of both rod and cone photoreceptors and that the course of the retinal degeneration of the mutant mouse retina mimics the course of human ADRP.
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