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      Canine and Feline Models of Human Genetic Diseases and Their Contributions to Advancing Clinical Therapies


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          Abstract

          For many lethal or debilitating genetic disorders in patients there are no satisfactory therapies. Several barriers exist that hinder the developments of effective therapies including the limited availability of clinically relevant animal models that faithfully recapitulate human genetic disease. In 1974, the Referral Center for Animal Models of Human Genetic Disease (RCAM) was established by Dr. Donald F. Patterson and continued by Dr. Mark E. Haskins at the University of Pennsylvania with the mission to discover, understand, treat, and maintain breeding colonies of naturally occurring hereditary disorders in dogs and cats that are orthologous to those found in human patients. Although non-human primates, sheep, and pig models are also available within the medical community, naturally occurring diseases are rarely identified in non-human primates, and the vast behavioral, clinicopathological, physiological, and anatomical knowledge available regarding dogs and cats far surpasses what is available in ovine and porcine species. The canine and feline models that are maintained at RCAM are presented here with a focus on preclinical therapy data. Clinical studies that have been generated from preclinical work in these models are also presented.

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          An error in dystrophin mRNA processing in golden retriever muscular dystrophy, an animal homologue of Duchenne muscular dystrophy.

          Golden retriever muscular dystrophy (GRMD) is a spontaneous, X-linked, progressively fatal disease of dogs and is also a homologue of Duchenne muscular dystrophy (DMD). Two-thirds of DMD patients carry detectable deletions in their dystrophin gene. The defect underlying the remaining one-third of DMD patients is undetermined. Analysis of the canine dystrophin gene in normal and GRMD dogs has failed to demonstrate any detectable loss of exons. Here, we have demonstrated a RNA processing error in GRMD that results from a single base change in the 3' consensus splice site of intron 6. The seventh exon is then skipped, which predicts a termination of the dystrophin reading frame within its N-terminal domain in exon 8. This is the first example of dystrophin deficiency caused by a splice-site mutation.
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            The homologue of the Duchenne locus is defective in X-linked muscular dystrophy of dogs.

            Duchenne muscular dystrophy (DMD) is the most common and the most severe of the muscular dystrophies in man. It is inherited as an X-linked recessive trait and is characterized by ongoing necrosis of skeletal muscle fibres with regeneration and eventually fibrosis and fatty infiltration. Although the gene and gene product which are defective in DMD have recently been identified, the pathogenesis of the disease is still poorly understood. A myopathy has been described in the dog which has been shown to be inherited as an X-linked trait and which is therefore a potential model of the human disease. We have studied the phenotypic expression of the disease, canine X-linked muscular dystrophy (CXMD), and have examined the molecular relationship between it and DMD. We report here that dogs with CXMD faithfully mimic the phenotype of Duchenne muscular dystrophy and that they lack the Duchenne gene transcript and its protein product, dystrophin.
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              Sustained AAV-mediated dystrophin expression in a canine model of Duchenne muscular dystrophy with a brief course of immunosuppression.

              Adeno-associated virus-based vector (AAV)-mediated gene delivery has been successful in some animal models of human disease such as the mdx mouse model of human Duchenne muscular dystrophy (DMD). However, recent evidence of immune-mediated loss of vector persistence in dogs and humans suggests that immune modulation might be necessary to achieve successful long-term transgene expression in these species. We have previously demonstrated that direct intramuscular injection of AAV2 or AAV6 in wild-type random-bred dogs resulted in a robust immune response to capsid or capsid-associated proteins. We now demonstrate that a brief course of immunosuppression with a combination of anti-thymocyte globulin (ATG), cyclosporine (CSP), and mycophenolate mofetil (MMF) is sufficient to permit long-term and robust expression of a canine micro-dystrophin (c-micro-dys) transgene in the skeletal muscle of a dog model for DMD (canine X-linked muscular dystrophy, or cxmd dog) and that its expression restored localization of components of the dystrophin-associated protein complex at the muscle membrane. This protocol has potential applications to human clinical trials to enhance AAV-mediated therapies.
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                Author and article information

                Journal
                Yale J Biol Med
                Yale J Biol Med
                yjbm
                YJBM
                The Yale Journal of Biology and Medicine
                YJBM
                0044-0086
                1551-4056
                25 September 2017
                September 2017
                : 90
                : 3
                : 417-431
                Affiliations
                Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA
                Author notes
                [* ]To whom all correspondence should be addressed: Dr. Charles H. Vite, 209 Rosenthal Building, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, 19104, Tel: 215-898-9473, Email: vite@ 123456vet.upenn.edu .

                Article
                yjbm903417
                5612185
                28955181
                7220c017-e993-412b-916c-c242286462f7
                Copyright ©2017, Yale Journal of Biology and Medicine

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License, which permits for noncommercial use, distribution, and reproduction in any digital medium, provided the original work is properly cited and is not altered in any way.

                History
                Categories
                Review
                Focus: Comparative Medicine

                Medicine
                large animal models,rare disease,genetic disease,feline,canine,referral center,resource,preclinical trial

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