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Journal of Ophthalmology
Volume 2015, Article ID 819760, 10 pages
http://dx.doi.org/10.1155/2015/819760
Research Article

Retinitis Pigmentosa with EYS Mutations Is the Most Prevalent Inherited Retinal Dystrophy in Japanese Populations

1Laboratory for Retinal Regeneration, Center for Developmental Biology, RIKEN, Kobe 650-0047, Japan
2Department of Ophthalmology, Case Western Reserve University, Cleveland, OH 44124, USA
3Department of Pharmacology, Case Western Reserve University, Cleveland, OH 44124, USA
4Institute of Biomedical Research Innovation Hospital, Kobe 650-0047, Japan
5Department of Medical Ethics/Medical Genetics, Kyoto University School of Public Health, Kyoto 606-8501, Japan
6Kobe City Medical Center General Hospital, Kobe 650-0047, Japan

Received 7 January 2015; Accepted 19 May 2015

Academic Editor: Antonio Benito

Copyright © 2015 Yuuki Arai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to gain information about disease prevalence and to identify the responsible genes for inherited retinal dystrophies (IRD) in Japanese populations. Clinical and molecular evaluations were performed on 349 patients with IRD. For segregation analyses, 63 of their family members were employed. Bioinformatics data from 1,208 Japanese individuals were used as controls. Molecular diagnosis was obtained by direct sequencing in a stepwise fashion utilizing one or two panels of 15 and 27 genes for retinitis pigmentosa patients. If a specific clinical diagnosis was suspected, direct sequencing of disease-specific genes, that is, ABCA4 for Stargardt disease, was conducted. Limited availability of intrafamily information and decreasing family size hampered identifying inherited patterns. Differential disease profiles with lower prevalence of Stargardt disease from European and North American populations were obtained. We found 205 sequence variants in 159 of 349 probands with an identification rate of 45.6%. This study found 43 novel sequence variants. In silico analysis suggests that 20 of 25 novel missense variants are pathogenic. EYS mutations had the highest prevalence at 23.5%. c.4957_4958insA and c.8868C>A were the two major EYS mutations identified in this cohort. EYS mutations are the most prevalent among Japanese patients with IRD.