This project is focused on accelerating the development and pre-clinical testing of new and effective approaches to therapy of hereditary retinal degenerations. These diseases are a major cause of blindness in people, affecting over 100,000 Americans, and are caused by a large number of different gene mutations, not all of which have yet been identified. Similar diseases also affect dogs, in many cases caused by identical or essentially similar gene mutations to those affecting people. In this project, studies will be undertaken in a research colony of dogs affected by such hereditary retinal diseases to better understand the genetic and pathogenetic mechanisms of these diseases, and evaluate potential methods of disease prevention, therapy or amelioration. Specific canine strains with well characterized retinal disorders will be maintained, bred, and made available to research investigators for collaborative studies aimed at a) increasing our understanding of the molecular mechanisms involved in these diseases and b) preclinical evaluation of potential therapies. Collaborations to effectively utilize these mutants will be initiated by the Principal Investigators interacting with independently funded investigators, to develop, implement and conduct specific protocols for optimal utilization of these mutants. Special emphasis will be placed on collaborative studies that: i) develop vectors for gene therapy that primarily target rod and/or cone photoreceptors, and test these vectors in appropriate canine models. For example, cone-specific vectors will be tested in canine models of achromatopsia, and rod-specific vectors will be tested in a canine model of autosomal dominant retinitis pigmentosa. ii) identify the causative mutations in new canine hereditary retinal degenerations, and investigate the cell biologic mechanisms critical to the pathogenesis of such diseases. For example, the mutations responsible for 3 canine cone-rod dystrophies will be identified. This will then allow these models to be used for gene-specific therapy studies. iii) Identify molecular signals favoring either the death or survival of photoreceptors during the onset of disease, and attempt to modulate such processes as either an adjunct or alternative to gene-specific therapies.
Hereditary retinal degenerations are a major cause of human blindness. Before potential therapies can be made available for affected people it is essential that they be tested for effectiveness and evaluated for safety in appropriate clinically relevant model systems. This research proposal focuses on the development and preclinical proof of principle testing of new gene therapies to restore retinal function and prevent degeneration in genetically affected retinas.
| Miyadera, Keiko (2018) Mapping of Canine Models of Inherited Retinal Diseases. Adv Exp Med Biol 1074:257-264 |
| Hardcastle, Alison J; Sieving, Paul A; Sahel, José-Alain et al. (2018) Translational Retinal Research and Therapies. Transl Vis Sci Technol 7:8 |
| Sudharsan, Raghavi; Elliott, Michael H; Dolgova, Natalia et al. (2018) Photoreceptor Outer Segment Isolation from a Single Canine Retina for RPE Phagocytosis Assay. Adv Exp Med Biol 1074:593-601 |
| Guziewicz, Karina E; McTish, Emily; Dufour, Valerie L et al. (2018) Underdeveloped RPE Apical Domain Underlies Lesion Formation in Canine Bestrophinopathies. Adv Exp Med Biol 1074:309-315 |
| Guziewicz, Karina E; Cideciyan, Artur V; Beltran, William A et al. (2018) BEST1 gene therapy corrects a diffuse retina-wide microdetachment modulated by light exposure. Proc Natl Acad Sci U S A 115:E2839-E2848 |
| Cideciyan, Artur V; Sudharsan, Raghavi; Dufour, Valérie L et al. (2018) Mutation-independent rhodopsin gene therapy by knockdown and replacement with a single AAV vector. Proc Natl Acad Sci U S A 115:E8547-E8556 |
| Das, Rueben G; Marinho, Felipe Pompeo; Iwabe, Simone et al. (2017) Variabilities in retinal function and structure in a canine model of cone-rod dystrophy associated with RPGRIP1 support multigenic etiology. Sci Rep 7:12823 |
| Yeh, Connie Y; Koehl, Kristin L; Harman, Christine D et al. (2017) Assessment of Rod, Cone, and Intrinsically Photosensitive Retinal Ganglion Cell Contributions to the Canine Chromatic Pupillary Response. Invest Ophthalmol Vis Sci 58:65-78 |
| Sudharsan, Raghavi; Beiting, Daniel P; Aguirre, Gustavo D et al. (2017) Involvement of Innate Immune System in Late Stages of Inherited Photoreceptor Degeneration. Sci Rep 7:17897 |
| Ye, Guo-Jie; Komáromy, András M; Zeiss, Caroline et al. (2017) Safety and Efficacy of AAV5 Vectors Expressing Human or Canine CNGB3 in CNGB3-Mutant Dogs. Hum Gene Ther Clin Dev 28:197-207 |
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