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A Comprehensive Study of the Retinal Phenotype of Rpe65-Deficient Dogs.

Annear, MJ; Mowat, FM; Occelli, LM; Smith, AJ; Curran, PG; Bainbridge, JW; Ali, RR; (2021) A Comprehensive Study of the Retinal Phenotype of Rpe65-Deficient Dogs. Cells , 10 , Article 115. 10.3390/cells10010115. Green open access

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Abstract

The Rpe65-deficient dog has been important for development of translational therapies of Leber congenital amaurosis type 2 (LCA2). The purpose of this study was to provide a comprehensive report of the natural history of retinal changes in this dog model. Rpe65-deficient dogs from 2 months to 10 years of age were assessed by fundus imaging, electroretinography (ERG) and vision testing (VT). Changes in retinal layer thickness were assessed by optical coherence tomography and on plastic retinal sections. ERG showed marked loss of retinal sensitivity, with amplitudes declining with age. Retinal thinning initially developed in the area centralis, with a slower thinning of the outer retina in other areas starting with the inferior retina. VT showed that dogs of all ages performed well in bright light, while at lower light levels they were blind. Retinal pigment epithelial (RPE) inclusions developed and in younger dogs and increased in size with age. The loss of photoreceptors was mirrored by a decline in ERG amplitudes. The slow degeneration meant that sufficient photoreceptors, albeit very desensitized, remained to allow for residual bright light vision in older dogs. This study shows the natural history of the Rpe65-deficient dog model of LCA2.

Type: Article
Title: A Comprehensive Study of the Retinal Phenotype of Rpe65-Deficient Dogs.
Location: Switzerland
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/cells10010115
Publisher version: https://doi.org/10.3390/cells10010115
Language: English
Additional information: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
Keywords: ERG, Leber congenital amaurosis, OCT, Rpe65, canine, large animal model, retinal degeneration
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
URI: https://discovery.ucl.ac.uk/id/eprint/10119354
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