Abstract
Purpose
We report a 15-month follow-up case on a Chinese patient with Oguchi disease associated with the multiple evanescent white dot syndrome (MEWDS).
Methods
The patient’s clinical presentation and follow-up visits were documented via decimal best-corrected visual acuity, fundus photography, fundus autofluorescence (FAF) imaging, near-infrared FAF, spectral domain optical coherence tomography, Humphrey’s visual fields, microperimetry, and multifocal electroretinography. We also performed whole exome sequencing for screening variation in the patient and her relatives.
Results
The patient had typical clinical characteristic of Oguchi disease, including night blindness, the Mizuo–Nakamura phenomenon (a golden yellow discoloration of the fundus that disappears in the prolonged dark adaptation [DA]) and typical full-field electroretinogram changes (nearly undetected b-wave in 0.01 and 0.03 ERGs that can partially recover only after prolonged DA). Aside from Oguchi disease, the patient was also diagnosed with the MEWDS based on clinical detections, including suddenly reduced visual acuity, appeared white dots, blurred ellipsoid zone and disrupted interdigitation zone, enlarged blind spot, and reduced macular sensitivity. A series of investigations revealed that along with the 15-month follow-up after onset, the visual acuity enhanced, the numerous white dots disappeared, and the macular structure returned to normal. Moreover, the novel homozygous splicing alteration c.181 + 1G > A was identified in the SAG gene.
Conclusions
This work is the first long-term case study of a patient with Oguchi disease associated with the MEWDS. The recovery period of symptoms caused by the MEWDS was much longer than that in typical patients with MEWDS. Molecular genetics demonstrate that this is the first case of Oguchi disease caused by splicing alterations in the SAG gene.
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Acknowledgements
Kaoru Fujinami is a paid consultant of Astellas Pharma Inc, Kubota Pharmaceutical Holdings Co., Ltd, and Acucela Inc. Kaoru Fujinami reports personal fees from Astellas Pharma Inc, personal fees from Kubota Pharmaceutical Holdings Co., Ltd., personal fees from Acucela Inc., personal fees from SANTEN Company Limited, personal fees from Foundation Fighting Blindness, personal fees from Foundation Fighting Blindness Clinical Research Institute, personal fees from Japanese Ophthalmology Society, personal fees from Japan Retinitis Pigmentosa Society. Kaoru Fujinami reports grants from Astellas Pharma Inc (NCT03281005), outside the submitted work.
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Shiying Li is supported by grants from the National Nature Science Foundation of China (81974138), Third Military Medical University (Army Medical University) research grant (2017XYY02), and National Basic Research Program of China (2018YFA0107301). Gang Wang is supported by grants from the Third Military Medical University, Southwest Hospital Innovation Grant (SWH2015LC15). Kaoru Fujinami is supported by grants from Grant-in-Aid for Young Scientists (A) of the Ministry of Education, Culture, Sports, Science and Technology, Japan (16H06269), grants from Grant-in-Aid for Scientists to support international collaborative studies of the Ministry of Education, Culture, Sports, Science and Technology, Japan (16KK01930002), grants from National Hospital Organization Network Research Fund (H30-NHO-2-12), grants from the Foundation for Fighting Blindness–Alan Laties Career Development Program (CF-CL-0416-0696-UCL), grants from Health Labor Sciences Research Grant, The Ministry of Health, Labor and Welfare (201711107A), and grants from the Great Britain Sasakawa Foundation Butterfield Awards.
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The procedures used were approved by the local ethics committee of Southwest Eye Hospital, Third Military Medical University (Army Medical University), Chongqing, China (reference number: 73981486-2), and all procedures were performed in accordance with the Declaration of Helsinki.
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The patient and her relatives, who were also studied upon, gave informed consent for all procedures described involved in the study.
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All the experimental procedures were performed in accordance with institutional animal welfare guidelines, were approved by the Third Military Medical University Animal Care and Use Committee
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Liu, X., Gao, L., Wang, G. et al. Oguchi disease caused by a homozygous novel SAG splicing alteration associated with the multiple evanescent white dot syndrome: A 15-month follow-up. Doc Ophthalmol 141, 217–226 (2020). https://doi.org/10.1007/s10633-020-09766-z
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DOI: https://doi.org/10.1007/s10633-020-09766-z