The Roles of EYS in photoreceptor health

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Mutations in the secreted protein known as eyes shut homolog (EYS) make up a large number of autosomal recessive cases of cone-rod dystrophy and retinitis pigmentosa, retinal degeneration characterized by loss of photoreceptors. Interestingly, although present in most mammals, the rodent genome does not have a functional EYS locus. EYS protein in zebrafish is located near the connecting cilium, a structure that connects the inner and outer segment of photoreceptors and deletion of EYS causes photoreceptor degeneration in the zebrafish. Although EYS-deficient zebrafish does provide opportunities for mechanistic studies, it is a poor model for testing gene- or cell-based therapies for human retinal degeneration. This project is aimed at generating a novel EYS-deficient novel model essential for therapeutic development: Aim 1: Generation of a novel animal model bearing mutations in the EYS locus by genome editing. Aim 2: Evaluating retinal development and maturation by non-invasive assessments of structure and function: optical coherence tomography (OCT) and electroretinography (ERG). At the completion of the studies, we will have generated founder animals bearing mutations in the EYS locus. These animals will be used to generate a germline-transmitted EYS deficient retinal degeneration model in the future. They will be essential for testing gene- or cell-based therapies and for understanding how EYS deletion impacts the function and maintenance. In addition, robust protocols for non-invasive ophthalmologic and functional evaluations of the retina will be established for critical evaluation of retinal degeneration models in the future.