Medical Genetics in Ophthalmology: Through the Lens of Genetics-Informed Therapies OnDemand-Medical Genetics and Ophthalmology: More Than Meets the Eye

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Video Summary

David Valli discusses gyrate atrophy of the choroid and retina, a rare inherited disorder characterized by progressive retinal degeneration linked to ornithine metabolism defects. Initially identified in the 19th century, this disease shows autosomal recessive inheritance and is marked by elevated plasma ornithine due to ornithine aminotransferase (OAT) deficiency. Clinical features include childhood myopia, peripheral vision loss, cataracts, and progressive retinal atrophy, with higher incidence in Finland. Valli's research highlighted the metabolic pathways involved, showing that an arginine-restricted diet lowers ornithine levels and may slow disease progression. Mouse models mirrored human pathology, and dietary management prevented retinal degeneration. Current efforts focus on gene therapy targeting the liver to normalize ornithine levels, with promising preclinical results using AAV-mediated OAT gene replacement. Valli emphasizes the importance of collaboration between genetics and ophthalmology in understanding and treating gyrate atrophy, highlighting integrated clinical care and research driving potential future therapies.

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David Valle, MD, FACMG

Keywords

gyrate atrophy

ornithine aminotransferase deficiency

retinal degeneration

arginine-restricted diet

gene therapy

AAV-mediated OAT gene replacement